<?xml version="1.0" encoding="us-ascii"?>
<!--XBRL document created with Crossfire by Rivet Software version 5.7.123.0 http://www.rivetsoftware.com-->
<!--Based on XBRL 2.1-->
<!--Created on: 10/23/2013 2:31:18 PM-->
<!--Modified on: 10/23/2013 2:31:19 PM-->
<linkbase xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#StatementConsolidatedStatementOfChangesInEquity" roleURI="http://www.mack-cali.com/role/StatementConsolidatedStatementOfChangesInEquity" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureOrganizationAndBasisOfPresentationDetails" roleURI="http://www.mack-cali.com/role/DisclosureOrganizationAndBasisOfPresentationDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureSignificantAccountingPoliciesNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureSignificantAccountingPoliciesNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureSignificantAccountingPoliciesEstimatedUsefulLivesOfAssetsDetails" roleURI="http://www.mack-cali.com/role/DisclosureSignificantAccountingPoliciesEstimatedUsefulLivesOfAssetsDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureRealEstateTransactionsNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureRealEstateTransactionsNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureRealEstateTransactionsScheduleOfPurchasePriceAllocationDetails" roleURI="http://www.mack-cali.com/role/DisclosureRealEstateTransactionsScheduleOfPurchasePriceAllocationDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureRealEstateTransactionsScheduleOfConsolidationAmountsDetails" roleURI="http://www.mack-cali.com/role/DisclosureRealEstateTransactionsScheduleOfConsolidationAmountsDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureRealEstateTransactionsScheduleOfPropertiesWhichCommencedInitialOperationsDetails" roleURI="http://www.mack-cali.com/role/DisclosureRealEstateTransactionsScheduleOfPropertiesWhichCommencedInitialOperationsDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureRealEstateTransactionsScheduleOfPropertySalesDetails" roleURI="http://www.mack-cali.com/role/DisclosureRealEstateTransactionsScheduleOfPropertySalesDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesSummaryOfCompanySInvestmentInUnconsolidatedJointVenturesDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesSummaryOfCompanySInvestmentInUnconsolidatedJointVenturesDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesSummaryOfCompanySEquityInEarningsLossOfUnconsolidatedJointVenturesDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesSummaryOfCompanySEquityInEarningsLossOfUnconsolidatedJointVenturesDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesPlazaViiiAndIxAssociatesLLCNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesPlazaViiiAndIxAssociatesLLCNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesSouthPierAtHarborsideHotelNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesSouthPierAtHarborsideHotelNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesRedBankCorporatePlazaLLCNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesRedBankCorporatePlazaLLCNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVentures12VreelandAssociatesLLCNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVentures12VreelandAssociatesLLCNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesBostonDowntownCrossingNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesBostonDowntownCrossingNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesGaleJeffersonLLCNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesGaleJeffersonLLCNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesStamfordSmLlcNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesStamfordSmLlcNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesMarbellaRosegardenLLCNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesMarbellaRosegardenLLCNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesRosegardenMonacoHoldingsLLCNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesRosegardenMonacoHoldingsLLCNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesRosewoodLafayetteHoldingsLLCNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesRosewoodLafayetteHoldingsLLCNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesPrurosePortImperialSouth15LLCNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesPrurosePortImperialSouth15LLCNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesRosewoodMorristownLLCNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesRosewoodMorristownLLCNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesOverlookRidgeJvLLCNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesOverlookRidgeJvLLCNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesOverlookRidgeLLCNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesOverlookRidgeLLCNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesOverlookRidgeJv2c3bLLCNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesOverlookRidgeJv2c3bLLCNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesRoselandNorthRetailLLCNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesRoselandNorthRetailLLCNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesBnesAssociatesIiiNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesBnesAssociatesIiiNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesPortsideMasterCompanyLLCNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesPortsideMasterCompanyLLCNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesPrurosePortImperialSouth13LlcNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesPrurosePortImperialSouth13LlcNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesRoselandPortImperialPartnersLPNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesRoselandPortImperialPartnersLPNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesRosegardenMarbellaSouthLLCNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesRosegardenMarbellaSouthLLCNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesPruroseRiverwalkGLLCNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesPruroseRiverwalkGLLCNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesElmajoUrbanRenewalAssociatesLLCEstuaryUrbanRenewalUnitBLlcNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesElmajoUrbanRenewalAssociatesLLCEstuaryUrbanRenewalUnitBLlcNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesRiverparkAtHarrisonILLCNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesRiverparkAtHarrisonILLCNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVentures150MainStreetLLCNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVentures150MainStreetLLCNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesRosegardenMonacoLLCNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesRosegardenMonacoLLCNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesHillsborough206HoldingsLLCNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesHillsborough206HoldingsLLCNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesGrandJerseyWaterfrontUrbanRenewalAssociatesLLCNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesGrandJerseyWaterfrontUrbanRenewalAssociatesLLCNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureInvestmentsInUnconsolidatedJointVenturesCrystalHouseApartmentsInvestorsLlcNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesCrystalHouseApartmentsInvestorsLlcNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureDiscontinuedOperationsNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureDiscontinuedOperationsNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureSeniorUnsecuredNotesNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureSeniorUnsecuredNotesNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureSeniorUnsecuredNotesSummaryOfSeniorUnsecuredNotesDetails" roleURI="http://www.mack-cali.com/role/DisclosureSeniorUnsecuredNotesSummaryOfSeniorUnsecuredNotesDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureUnsecuredRevolvingCreditFacilityNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureUnsecuredRevolvingCreditFacilityNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureUnsecuredRevolvingCreditFacilityChangeInOperatingPartnershipSUnsecuredDebtRatingsDetails" roleURI="http://www.mack-cali.com/role/DisclosureUnsecuredRevolvingCreditFacilityChangeInOperatingPartnershipSUnsecuredDebtRatingsDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureMortgagesLoansPayableAndOtherObligationsNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureMortgagesLoansPayableAndOtherObligationsNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureMortgagesLoansPayableAndOtherObligationsSummaryOfMortgagesLoansPayableAndOtherObligationsDetails" roleURI="http://www.mack-cali.com/role/DisclosureMortgagesLoansPayableAndOtherObligationsSummaryOfMortgagesLoansPayableAndOtherObligationsDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureEmployeeBenefit401KPlansAndDeferredRetirementCompensationAgreementsDetails" roleURI="http://www.mack-cali.com/role/DisclosureEmployeeBenefit401KPlansAndDeferredRetirementCompensationAgreementsDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureCommitmentsAndContingenciesNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureCommitmentsAndContingenciesNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureTenantLeasesDetails" roleURI="http://www.mack-cali.com/role/DisclosureTenantLeasesDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureMackCaliRealtyCorporationStockholdersEquityShareRepurchaseProgramAndDividendReinvestmentAndStockPurchasePlanNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureMackCaliRealtyCorporationStockholdersEquityShareRepurchaseProgramAndDividendReinvestmentAndStockPurchasePlanNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureMackCaliRealtyCorporationStockholdersEquityStockOptionsPlansNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureMackCaliRealtyCorporationStockholdersEquityStockOptionsPlansNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureMackCaliRealtyCorporationStockholdersEquityRestrictedStockAwardsAndTsrBasedAwardsNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureMackCaliRealtyCorporationStockholdersEquityRestrictedStockAwardsAndTsrBasedAwardsNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureMackCaliRealtyCorporationStockholdersEquityEarningsPerShareNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureMackCaliRealtyCorporationStockholdersEquityEarningsPerShareNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureNoncontrollingInterestsInSubsidiariesNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureNoncontrollingInterestsInSubsidiariesNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureSegmentReportingNarrativeDetails" roleURI="http://www.mack-cali.com/role/DisclosureSegmentReportingNarrativeDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureSegmentReportingSelectedResultsOfOperationsAndAssetInformationDetails" roleURI="http://www.mack-cali.com/role/DisclosureSegmentReportingSelectedResultsOfOperationsAndAssetInformationDetails" />
  <roleRef xlink:type="simple" xlink:href="cli-20130930.xsd#DisclosureSegmentReportingScheduleOfReconciliationOfNetOperatingIncomeToIncomeFromContinuingOperationsDetails" roleURI="http://www.mack-cali.com/role/DisclosureSegmentReportingScheduleOfReconciliationOfNetOperatingIncomeToIncomeFromContinuingOperationsDetails" />
  <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" />
  <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" />
  <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" />
  <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" />
  <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" arcroleURI="http://xbrl.org/int/dim/arcrole/all" />
  <definitionLink xlink:role="http://www.mack-cali.com/role/StatementConsolidatedStatementOfChangesInEquity" xlink:type="extended" xlink:title="00300 - Statement - Consolidated Statement Of Changes In Equity">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="us-gaap_StatementTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="us-gaap_StatementEquityComponentsAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_StatementEquityComponentsAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="us-gaap_EquityComponentDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="us-gaap_EquityComponentDomain_635181354718720567" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain_635181354718720567" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockMember" xlink:label="us-gaap_CommonStockMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_CommonStockMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="us-gaap_AdditionalPaidInCapitalMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_AdditionalPaidInCapitalMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="us-gaap_RetainedEarningsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_RetainedEarningsMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NoncontrollingInterestMember" xlink:label="us-gaap_NoncontrollingInterestMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_NoncontrollingInterestMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="us-gaap_StatementLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StatementTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SharesIssued" xlink:label="us-gaap_SharesIssued" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_SharesIssued" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProfitLoss" xlink:label="us-gaap_ProfitLoss" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_ProfitLoss" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DividendsCommonStock" xlink:label="us-gaap_DividendsCommonStock" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_DividendsCommonStock" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders" xlink:label="us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinorityInterestPeriodIncreaseDecrease" xlink:label="us-gaap_MinorityInterestPeriodIncreaseDecrease" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_MinorityInterestPeriodIncreaseDecrease" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueConversionOfUnits" xlink:label="us-gaap_StockIssuedDuringPeriodValueConversionOfUnits" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StockIssuedDuringPeriodValueConversionOfUnits" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits" xlink:label="us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan" xlink:label="us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan" xlink:label="us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation" xlink:label="us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance" xlink:label="us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureOrganizationAndBasisOfPresentationDetails" xlink:type="extended" xlink:title="40101 - Disclosure - Organization And Basis Of Presentation (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfRealEstatePropertiesTable" xlink:label="us-gaap_ScheduleOfRealEstatePropertiesTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis" xlink:label="us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfRealEstatePropertiesTable" xlink:to="us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain" xlink:label="us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis" xlink:to="us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain" xlink:label="us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain_635181354718760555" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis" xlink:to="us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain_635181354718760555" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_OfficeAndOfficeFlexBuildingsMember" xlink:label="cli_OfficeAndOfficeFlexBuildingsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain" xlink:to="cli_OfficeAndOfficeFlexBuildingsMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_UnconsolidatedJointVentureOfficeBuildingsMember" xlink:label="cli_UnconsolidatedJointVentureOfficeBuildingsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain" xlink:to="cli_UnconsolidatedJointVentureOfficeBuildingsMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_IndustrialAndWarehouseFacilitiesMember" xlink:label="cli_IndustrialAndWarehouseFacilitiesMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain" xlink:to="cli_IndustrialAndWarehouseFacilitiesMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MultipleFamilyPropertiesMember" xlink:label="cli_MultipleFamilyPropertiesMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain" xlink:to="cli_MultipleFamilyPropertiesMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_UnconsolidatedJointVentureMultipleFamilyPropertiesMember" xlink:label="cli_UnconsolidatedJointVentureMultipleFamilyPropertiesMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain" xlink:to="cli_UnconsolidatedJointVentureMultipleFamilyPropertiesMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RetailSiteMember" xlink:label="us-gaap_RetailSiteMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain" xlink:to="us-gaap_RetailSiteMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_UnconsolidatedJointVentureRetailBuildingsMember" xlink:label="cli_UnconsolidatedJointVentureRetailBuildingsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain" xlink:to="cli_UnconsolidatedJointVentureRetailBuildingsMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_UnconsolidatedJointVentureHotelMember" xlink:label="cli_UnconsolidatedJointVentureHotelMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain" xlink:to="cli_UnconsolidatedJointVentureHotelMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LandMember" xlink:label="us-gaap_LandMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain" xlink:to="us-gaap_LandMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstatePropertiesLineItems" xlink:label="us-gaap_RealEstatePropertiesLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="us-gaap_ScheduleOfRealEstatePropertiesTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RealEstatePropertyOwnedAndInvestmentInterest" xlink:label="cli_RealEstatePropertyOwnedAndInvestmentInterest" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="cli_RealEstatePropertyOwnedAndInvestmentInterest" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RealEstatePropertyOwnedAndInvestmentInterestArea" xlink:label="cli_RealEstatePropertyOwnedAndInvestmentInterestArea" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="cli_RealEstatePropertyOwnedAndInvestmentInterestArea" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfUnitsInRealEstateProperty" xlink:label="us-gaap_NumberOfUnitsInRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="us-gaap_NumberOfUnitsInRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RealEstatePropertyOwnedOrInvestmentInterestNumberOfLocation" xlink:label="cli_RealEstatePropertyOwnedOrInvestmentInterestNumberOfLocation" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="cli_RealEstatePropertyOwnedOrInvestmentInterestNumberOfLocation" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureSignificantAccountingPoliciesNarrativeDetails" xlink:type="extended" xlink:title="40201 - Disclosure - Significant Accounting Policies (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AccountingPoliciesTable" xlink:label="cli_AccountingPoliciesTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DividendsAxis" xlink:label="us-gaap_DividendsAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="cli_AccountingPoliciesTable" xlink:to="us-gaap_DividendsAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DividendsDomain" xlink:label="us-gaap_DividendsDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_DividendsAxis" xlink:to="us-gaap_DividendsDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DividendsDomain" xlink:label="us-gaap_DividendsDomain_635181354718780549" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="us-gaap_DividendsAxis" xlink:to="us-gaap_DividendsDomain_635181354718780549" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ThirdQuarterTwoThousandThirteenMember" xlink:label="cli_ThirdQuarterTwoThousandThirteenMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_DividendsDomain" xlink:to="cli_ThirdQuarterTwoThousandThirteenMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_FourthQuarterTwoThousandTwelveMember" xlink:label="cli_FourthQuarterTwoThousandTwelveMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_DividendsDomain" xlink:to="cli_FourthQuarterTwoThousandTwelveMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_SignificantAccountingPoliciesLineItems" xlink:label="cli_SignificantAccountingPoliciesLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="cli_SignificantAccountingPoliciesLineItems" xlink:to="cli_AccountingPoliciesTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_CapitalizedDevelopmentConstructionSalariesAndOtherRelatedExpenses" xlink:label="cli_CapitalizedDevelopmentConstructionSalariesAndOtherRelatedExpenses" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="cli_SignificantAccountingPoliciesLineItems" xlink:to="cli_CapitalizedDevelopmentConstructionSalariesAndOtherRelatedExpenses" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ConstructionInProgressGross" xlink:label="us-gaap_ConstructionInProgressGross" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="cli_SignificantAccountingPoliciesLineItems" xlink:to="us-gaap_ConstructionInProgressGross" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NumberOfPropertiesPlacedInService" xlink:label="cli_NumberOfPropertiesPlacedInService" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="cli_SignificantAccountingPoliciesLineItems" xlink:to="cli_NumberOfPropertiesPlacedInService" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MaximumPeriodAfterCessationOfMajorConstructionActivityThatProjectsAreConsideredComplete" xlink:label="cli_MaximumPeriodAfterCessationOfMajorConstructionActivityThatProjectsAreConsideredComplete" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="cli_SignificantAccountingPoliciesLineItems" xlink:to="cli_MaximumPeriodAfterCessationOfMajorConstructionActivityThatProjectsAreConsideredComplete" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ConsolidatedJointVenturesRealEstateAssets" xlink:label="cli_ConsolidatedJointVenturesRealEstateAssets" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="cli_SignificantAccountingPoliciesLineItems" xlink:to="cli_ConsolidatedJointVenturesRealEstateAssets" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ConsolidatedJointVenturesMortgages" xlink:label="cli_ConsolidatedJointVenturesMortgages" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="cli_SignificantAccountingPoliciesLineItems" xlink:to="cli_ConsolidatedJointVenturesMortgages" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ConsolidatedJointVenturesOtherLiabilites" xlink:label="cli_ConsolidatedJointVenturesOtherLiabilites" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="cli_SignificantAccountingPoliciesLineItems" xlink:to="cli_ConsolidatedJointVenturesOtherLiabilites" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AmortizationOfFinancingCosts" xlink:label="us-gaap_AmortizationOfFinancingCosts" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="cli_SignificantAccountingPoliciesLineItems" xlink:to="us-gaap_AmortizationOfFinancingCosts" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_WriteOffOfDeferredDebtIssuanceCost" xlink:label="us-gaap_WriteOffOfDeferredDebtIssuanceCost" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="cli_SignificantAccountingPoliciesLineItems" xlink:to="us-gaap_WriteOffOfDeferredDebtIssuanceCost" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AmortizationOfDeferredLeasingFees" xlink:label="us-gaap_AmortizationOfDeferredLeasingFees" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="cli_SignificantAccountingPoliciesLineItems" xlink:to="us-gaap_AmortizationOfDeferredLeasingFees" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MaterialAdjustmentAmount" xlink:label="cli_MaterialAdjustmentAmount" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="cli_SignificantAccountingPoliciesLineItems" xlink:to="cli_MaterialAdjustmentAmount" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="us-gaap_CommonStockSharesOutstanding" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="cli_SignificantAccountingPoliciesLineItems" xlink:to="us-gaap_CommonStockSharesOutstanding" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_CommonUnitsOutstanding" xlink:label="cli_CommonUnitsOutstanding" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="cli_SignificantAccountingPoliciesLineItems" xlink:to="cli_CommonUnitsOutstanding" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DividendsPayableDateOfRecordDayMonthAndYear" xlink:label="us-gaap_DividendsPayableDateOfRecordDayMonthAndYear" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="15" xlink:from="cli_SignificantAccountingPoliciesLineItems" xlink:to="us-gaap_DividendsPayableDateOfRecordDayMonthAndYear" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_CommonStockDividendsAndCommonUnitDistributionsPerShare" xlink:label="cli_CommonStockDividendsAndCommonUnitDistributionsPerShare" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="16" xlink:from="cli_SignificantAccountingPoliciesLineItems" xlink:to="cli_CommonStockDividendsAndCommonUnitDistributionsPerShare" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DividendPayableDateToBePaidDayMonthAndYear" xlink:label="us-gaap_DividendPayableDateToBePaidDayMonthAndYear" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="17" xlink:from="cli_SignificantAccountingPoliciesLineItems" xlink:to="us-gaap_DividendPayableDateToBePaidDayMonthAndYear" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RestrictedStockExpense" xlink:label="us-gaap_RestrictedStockExpense" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="18" xlink:from="cli_SignificantAccountingPoliciesLineItems" xlink:to="us-gaap_RestrictedStockExpense" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DifferenceBetweenOtherComprehensiveIncomeAndNetIncomeLoss" xlink:label="cli_DifferenceBetweenOtherComprehensiveIncomeAndNetIncomeLoss" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="19" xlink:from="cli_SignificantAccountingPoliciesLineItems" xlink:to="cli_DifferenceBetweenOtherComprehensiveIncomeAndNetIncomeLoss" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="20" xlink:from="cli_SignificantAccountingPoliciesLineItems" xlink:to="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureSignificantAccountingPoliciesEstimatedUsefulLivesOfAssetsDetails" xlink:type="extended" xlink:title="40202 - Disclosure - Significant Accounting Policies (Estimated Useful Lives Of Assets) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="us-gaap_RangeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:to="us-gaap_RangeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="us-gaap_RangeMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RangeAxis" xlink:to="us-gaap_RangeMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="us-gaap_RangeMember_635181354720240111" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="us-gaap_RangeAxis" xlink:to="us-gaap_RangeMember_635181354720240111" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinimumMember" xlink:label="us-gaap_MinimumMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RangeMember" xlink:to="us-gaap_MinimumMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MaximumMember" xlink:label="us-gaap_MaximumMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_RangeMember" xlink:to="us-gaap_MaximumMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:to="us-gaap_PropertyPlantAndEquipmentByTypeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="us-gaap_PropertyPlantAndEquipmentTypeDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:to="us-gaap_PropertyPlantAndEquipmentTypeDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="us-gaap_PropertyPlantAndEquipmentTypeDomain_635181354720250108" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:to="us-gaap_PropertyPlantAndEquipmentTypeDomain_635181354720250108" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BuildingAndBuildingImprovementsMember" xlink:label="us-gaap_BuildingAndBuildingImprovementsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="us-gaap_BuildingAndBuildingImprovementsMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FurnitureAndFixturesMember" xlink:label="us-gaap_FurnitureAndFixturesMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="us-gaap_FurnitureAndFixturesMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="us-gaap_PropertyPlantAndEquipmentLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_PropertyPlantAndEquipmentLineItems" xlink:to="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:label="us-gaap_PropertyPlantAndEquipmentUsefulLife" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_PropertyPlantAndEquipmentLineItems" xlink:to="us-gaap_PropertyPlantAndEquipmentUsefulLife" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureRealEstateTransactionsNarrativeDetails" xlink:type="extended" xlink:title="40301 - Disclosure - Real Estate Transactions (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfRealEstatePropertiesTable" xlink:label="us-gaap_ScheduleOfRealEstatePropertiesTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="us-gaap_RangeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfRealEstatePropertiesTable" xlink:to="us-gaap_RangeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="us-gaap_RangeMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RangeAxis" xlink:to="us-gaap_RangeMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinimumMember" xlink:label="us-gaap_MinimumMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RangeMember" xlink:to="us-gaap_MinimumMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MaximumMember" xlink:label="us-gaap_MaximumMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_RangeMember" xlink:to="us-gaap_MaximumMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermDebtTypeAxis" xlink:label="us-gaap_ShortTermDebtTypeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_ScheduleOfRealEstatePropertiesTable" xlink:to="us-gaap_ShortTermDebtTypeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="us-gaap_ShortTermDebtTypeDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ShortTermDebtTypeAxis" xlink:to="us-gaap_ShortTermDebtTypeDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="us-gaap_ShortTermDebtTypeDomain_635181354720270102" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="us-gaap_ShortTermDebtTypeAxis" xlink:to="us-gaap_ShortTermDebtTypeDomain_635181354720270102" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ConstructionLoanMember" xlink:label="cli_ConstructionLoanMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_ShortTermDebtTypeDomain" xlink:to="cli_ConstructionLoanMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="us-gaap_ScheduleOfRealEstatePropertiesTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain_635181354720270102" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain_635181354720270102" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_OneHundredFiftyMainStreetLLCMember" xlink:label="cli_OneHundredFiftyMainStreetLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_OneHundredFiftyMainStreetLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="4" xlink:from="us-gaap_ScheduleOfRealEstatePropertiesTable" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_635181354720280099" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_635181354720280099" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_EastchesterProjectMember" xlink:label="cli_EastchesterProjectMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:to="cli_EastchesterProjectMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="us-gaap_StatementGeographicalAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="5" xlink:from="us-gaap_ScheduleOfRealEstatePropertiesTable" xlink:to="us-gaap_StatementGeographicalAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="us-gaap_SegmentGeographicalDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_StatementGeographicalAxis" xlink:to="us-gaap_SegmentGeographicalDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="us-gaap_SegmentGeographicalDomain_635181354720290096" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="us-gaap_StatementGeographicalAxis" xlink:to="us-gaap_SegmentGeographicalDomain_635181354720290096" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/stpr/2011/stpr-2011-01-31.xsd#stpr_NJ" xlink:label="stpr_NJ" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_SegmentGeographicalDomain" xlink:to="stpr_NJ" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis" xlink:label="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="6" xlink:from="us-gaap_ScheduleOfRealEstatePropertiesTable" xlink:to="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:label="us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis" xlink:to="us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:label="us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_635181354720290096" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis" xlink:to="us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_635181354720290096" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NineteenSkylineDriveMember" xlink:label="cli_NineteenSkylineDriveMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:to="cli_NineteenSkylineDriveMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PennsylvaniaOfficePortfolioMember" xlink:label="cli_PennsylvaniaOfficePortfolioMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:to="cli_PennsylvaniaOfficePortfolioMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="us-gaap_BusinessAcquisitionAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="7" xlink:from="us-gaap_ScheduleOfRealEstatePropertiesTable" xlink:to="us-gaap_BusinessAcquisitionAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="us-gaap_BusinessAcquisitionAcquireeDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_BusinessAcquisitionAxis" xlink:to="us-gaap_BusinessAcquisitionAcquireeDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="us-gaap_BusinessAcquisitionAcquireeDomain_635181354720300093" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="us-gaap_BusinessAcquisitionAxis" xlink:to="us-gaap_BusinessAcquisitionAcquireeDomain_635181354720300093" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AlterraAtOverlookRidgeIMember" xlink:label="cli_AlterraAtOverlookRidgeIMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_BusinessAcquisitionAcquireeDomain" xlink:to="cli_AlterraAtOverlookRidgeIMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AlterraAtOverlookRidgeIBMember" xlink:label="cli_AlterraAtOverlookRidgeIBMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_BusinessAcquisitionAcquireeDomain" xlink:to="cli_AlterraAtOverlookRidgeIBMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="8" xlink:from="us-gaap_ScheduleOfRealEstatePropertiesTable" xlink:to="dei_LegalEntityAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain_635181354720310090" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain_635181354720310090" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_KeystoneAffiliatesMember" xlink:label="cli_KeystoneAffiliatesMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="dei_EntityDomain" xlink:to="cli_KeystoneAffiliatesMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_JMPEastchesterLLCMember" xlink:label="cli_JMPEastchesterLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="dei_EntityDomain" xlink:to="cli_JMPEastchesterLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HudsonValleyLandHoldingsLLCMember" xlink:label="cli_HudsonValleyLandHoldingsLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="dei_EntityDomain" xlink:to="cli_HudsonValleyLandHoldingsLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstatePropertiesLineItems" xlink:label="us-gaap_RealEstatePropertiesLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="us-gaap_ScheduleOfRealEstatePropertiesTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfUnitsInRealEstateProperty" xlink:label="us-gaap_NumberOfUnitsInRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="us-gaap_NumberOfUnitsInRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross" xlink:label="us-gaap_PaymentsToAcquireBusinessesGross" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="us-gaap_PaymentsToAcquireBusinessesGross" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts" xlink:label="us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="us-gaap_EquityMethodInvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="us-gaap_EquityMethodInvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AreaOfRealEstateProperty" xlink:label="us-gaap_AreaOfRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="us-gaap_AreaOfRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NumberOfLandParcelsSold" xlink:label="cli_NumberOfLandParcelsSold" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="cli_NumberOfLandParcelsSold" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ThirdPartyOwnershipPercent" xlink:label="cli_ThirdPartyOwnershipPercent" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="cli_ThirdPartyOwnershipPercent" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_EstimatedCostOfProject" xlink:label="cli_EstimatedCostOfProject" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="cli_EstimatedCostOfProject" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AmountOfProjectCostsFundedByMembers" xlink:label="cli_AmountOfProjectCostsFundedByMembers" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="cli_AmountOfProjectCostsFundedByMembers" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinorityInterestOwnershipPercentageByParent" xlink:label="us-gaap_MinorityInterestOwnershipPercentageByParent" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="us-gaap_MinorityInterestOwnershipPercentageByParent" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromSaleOfBuildings" xlink:label="us-gaap_ProceedsFromSaleOfBuildings" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="us-gaap_ProceedsFromSaleOfBuildings" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ProceedsFromSaleOfRealEstateNetOfClosingCosts" xlink:label="cli_ProceedsFromSaleOfRealEstateNetOfClosingCosts" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="cli_ProceedsFromSaleOfRealEstateNetOfClosingCosts" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DiscontinuedOperationRealEstateSalePrice" xlink:label="cli_DiscontinuedOperationRealEstateSalePrice" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="15" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="cli_DiscontinuedOperationRealEstateSalePrice" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageLoansOnRealEstateNumberOfLoans" xlink:label="us-gaap_MortgageLoansOnRealEstateNumberOfLoans" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="16" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="us-gaap_MortgageLoansOnRealEstateNumberOfLoans" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageLoansOnRealEstateNewMortgageLoans" xlink:label="us-gaap_MortgageLoansOnRealEstateNewMortgageLoans" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="17" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="us-gaap_MortgageLoansOnRealEstateNewMortgageLoans" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MortgageLoansOnRealEstateAmountOfMortgageFundedAtClosing" xlink:label="cli_MortgageLoansOnRealEstateAmountOfMortgageFundedAtClosing" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="18" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="cli_MortgageLoansOnRealEstateAmountOfMortgageFundedAtClosing" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PartnersCapital" xlink:label="us-gaap_PartnersCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="19" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="us-gaap_PartnersCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ProceedsFromSaleOfRealEstateAmountHeldByIntermediaryForReinvestment" xlink:label="cli_ProceedsFromSaleOfRealEstateAmountHeldByIntermediaryForReinvestment" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="20" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="cli_ProceedsFromSaleOfRealEstateAmountHeldByIntermediaryForReinvestment" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_CostsOfRealEstateServices" xlink:label="cli_CostsOfRealEstateServices" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="21" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="cli_CostsOfRealEstateServices" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MortgageLoanMaturityPeriod" xlink:label="cli_MortgageLoanMaturityPeriod" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="22" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="cli_MortgageLoanMaturityPeriod" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtInstrumentExtensionPeriod" xlink:label="cli_DebtInstrumentExtensionPeriod" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="23" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="cli_DebtInstrumentExtensionPeriod" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="24" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InitialInternalRateOfReturn" xlink:label="cli_InitialInternalRateOfReturn" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="25" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="cli_InitialInternalRateOfReturn" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InternalRateOfReturn" xlink:label="cli_InternalRateOfReturn" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="26" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="cli_InternalRateOfReturn" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AmountOfDebtGuaranteedByCompany" xlink:label="cli_AmountOfDebtGuaranteedByCompany" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="27" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="cli_AmountOfDebtGuaranteedByCompany" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NumberOfImpairedRealEstateProperties" xlink:label="cli_NumberOfImpairedRealEstateProperties" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="28" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="cli_NumberOfImpairedRealEstateProperties" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetImpairmentCharges" xlink:label="us-gaap_AssetImpairmentCharges" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="29" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="us-gaap_AssetImpairmentCharges" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SecuredDebt" xlink:label="us-gaap_SecuredDebt" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="30" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="us-gaap_SecuredDebt" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_FairValueInputsCapitalizationRate" xlink:label="cli_FairValueInputsCapitalizationRate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="31" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="cli_FairValueInputsCapitalizationRate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueInputsDiscountRate" xlink:label="us-gaap_FairValueInputsDiscountRate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="32" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="us-gaap_FairValueInputsDiscountRate" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureRealEstateTransactionsScheduleOfPurchasePriceAllocationDetails" xlink:type="extended" xlink:title="40302 - Disclosure - Real Estate Transactions (Schedule Of Purchase Price Allocation) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="us-gaap_RangeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:to="us-gaap_RangeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="us-gaap_RangeMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RangeAxis" xlink:to="us-gaap_RangeMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MaximumMember" xlink:label="us-gaap_MaximumMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RangeMember" xlink:to="us-gaap_MaximumMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="us-gaap_BusinessAcquisitionAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:to="us-gaap_BusinessAcquisitionAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="us-gaap_BusinessAcquisitionAcquireeDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_BusinessAcquisitionAxis" xlink:to="us-gaap_BusinessAcquisitionAcquireeDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AlterraAtOverlookRidgeIMember" xlink:label="cli_AlterraAtOverlookRidgeIMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_BusinessAcquisitionAcquireeDomain" xlink:to="cli_AlterraAtOverlookRidgeIMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AlterraAtOverlookRidgeIBMember" xlink:label="cli_AlterraAtOverlookRidgeIBMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_BusinessAcquisitionAcquireeDomain" xlink:to="cli_AlterraAtOverlookRidgeIBMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="us-gaap_BusinessAcquisitionLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_BusinessAcquisitionLineItems" xlink:to="us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_BusinessAcquisitionLineItems" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_BusinessAcquisitionLineItems" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquipment" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquipment" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_BusinessAcquisitionLineItems" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquipment" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_BusinessAcquisitionLineItems" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_BusinessAcquisitionLineItems" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_BusinessAcquisitionLineItems" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_BusinessAcquisitionLineItems" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_BusinessAcquisitionLineItems" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife" xlink:label="us-gaap_FiniteLivedIntangibleAssetUsefulLife" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_BusinessAcquisitionLineItems" xlink:to="us-gaap_FiniteLivedIntangibleAssetUsefulLife" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureRealEstateTransactionsScheduleOfConsolidationAmountsDetails" xlink:type="extended" xlink:title="40303 - Disclosure - Real Estate Transactions (Schedule Of Consolidation Amounts) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="us-gaap_BusinessAcquisitionAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:to="us-gaap_BusinessAcquisitionAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="us-gaap_BusinessAcquisitionAcquireeDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_BusinessAcquisitionAxis" xlink:to="us-gaap_BusinessAcquisitionAcquireeDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_EastchesterProjectMember" xlink:label="cli_EastchesterProjectMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_BusinessAcquisitionAcquireeDomain" xlink:to="cli_EastchesterProjectMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="us-gaap_BusinessAcquisitionLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_BusinessAcquisitionLineItems" xlink:to="us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_BusinessAcquisitionLineItems" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedConstructionInProgress" xlink:label="cli_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedConstructionInProgress" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_BusinessAcquisitionLineItems" xlink:to="cli_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedConstructionInProgress" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_BusinessAcquisitionLineItems" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_BusinessAcquisitionLineItems" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_BusinessAcquisitionLineItems" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_BusinessAcquisitionLineItems" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentNet" xlink:label="cli_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentNet" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_BusinessAcquisitionLineItems" xlink:to="cli_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentNet" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue" xlink:label="us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_BusinessAcquisitionLineItems" xlink:to="us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterest" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterest" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_BusinessAcquisitionLineItems" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterest" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureRealEstateTransactionsScheduleOfPropertiesWhichCommencedInitialOperationsDetails" xlink:type="extended" xlink:title="40304 - Disclosure - Real Estate Transactions (Schedule Of Properties Which Commenced Initial Operations) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfRealEstatePropertiesTable" xlink:label="us-gaap_ScheduleOfRealEstatePropertiesTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfRealEstatePropertiesTable" xlink:to="us-gaap_PropertyPlantAndEquipmentByTypeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="us-gaap_PropertyPlantAndEquipmentTypeDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:to="us-gaap_PropertyPlantAndEquipmentTypeDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LandMember" xlink:label="us-gaap_LandMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="us-gaap_LandMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LeaseAgreementsMember" xlink:label="us-gaap_LeaseAgreementsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="us-gaap_LeaseAgreementsMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_ScheduleOfRealEstatePropertiesTable" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_FourteenSylvanWayMember" xlink:label="cli_FourteenSylvanWayMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:to="cli_FourteenSylvanWayMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PortImperialSouthFourAndFiveMember" xlink:label="cli_PortImperialSouthFourAndFiveMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:to="cli_PortImperialSouthFourAndFiveMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstatePropertiesLineItems" xlink:label="us-gaap_RealEstatePropertiesLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="us-gaap_ScheduleOfRealEstatePropertiesTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NumberOfBuildingsOnPropertiesCommencingInitialOperations" xlink:label="cli_NumberOfBuildingsOnPropertiesCommencingInitialOperations" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="cli_NumberOfBuildingsOnPropertiesCommencingInitialOperations" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AreaOfRealEstatePropertyCommencingInitialOperations" xlink:label="cli_AreaOfRealEstatePropertyCommencingInitialOperations" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="cli_AreaOfRealEstatePropertyCommencingInitialOperations" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NumberOfParkingSpaces" xlink:label="cli_NumberOfParkingSpaces" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="cli_NumberOfParkingSpaces" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RealEstateDevelopmentCostsIncurred" xlink:label="cli_RealEstateDevelopmentCostsIncurred" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="cli_RealEstateDevelopmentCostsIncurred" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DevelopmentCostsPerParkingSpace" xlink:label="cli_DevelopmentCostsPerParkingSpace" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_RealEstatePropertiesLineItems" xlink:to="cli_DevelopmentCostsPerParkingSpace" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureRealEstateTransactionsScheduleOfPropertySalesDetails" xlink:type="extended" xlink:title="40305 - Disclosure - Real Estate Transactions (Schedule Of Property Sales) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable" xlink:label="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis" xlink:label="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable" xlink:to="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:label="us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis" xlink:to="us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NineteenSkylineDriveMember" xlink:label="cli_NineteenSkylineDriveMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:to="cli_NineteenSkylineDriveMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_FiftyFiveCorporateDriveMember" xlink:label="cli_FiftyFiveCorporateDriveMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:to="cli_FiftyFiveCorporateDriveMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_TwoHundredRiserRoadMember" xlink:label="cli_TwoHundredRiserRoadMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:to="cli_TwoHundredRiserRoadMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_SevenHundredSeventySevenPassaicAvenueMember" xlink:label="cli_SevenHundredSeventySevenPassaicAvenueMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:to="cli_SevenHundredSeventySevenPassaicAvenueMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_SixteenAndEighteenSentryParkWestMember" xlink:label="cli_SixteenAndEighteenSentryParkWestMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:to="cli_SixteenAndEighteenSentryParkWestMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_FiftyOneImcloneDriveMember" xlink:label="cli_FiftyOneImcloneDriveMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:to="cli_FiftyOneImcloneDriveMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_FortyRichardsAvenueMember" xlink:label="cli_FortyRichardsAvenueMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:to="cli_FortyRichardsAvenueMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_OneHunderedSixAllenRoadMember" xlink:label="cli_OneHunderedSixAllenRoadMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:to="cli_OneHunderedSixAllenRoadMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PennsylvaniaOfficePortfolioMember" xlink:label="cli_PennsylvaniaOfficePortfolioMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:to="cli_PennsylvaniaOfficePortfolioMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:label="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:to="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NumberOfBuildingsOnPropertiesSold" xlink:label="cli_NumberOfBuildingsOnPropertiesSold" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:to="cli_NumberOfBuildingsOnPropertiesSold" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AreaOfRealEstatePropertySold" xlink:label="cli_AreaOfRealEstatePropertySold" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:to="cli_AreaOfRealEstatePropertySold" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment" xlink:label="us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:to="us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNet" xlink:label="us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNet" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:to="us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNet" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GainLossOnDispositionOfRealEstateDiscontinuedOperations" xlink:label="us-gaap_GainLossOnDispositionOfRealEstateDiscontinuedOperations" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:to="us-gaap_GainLossOnDispositionOfRealEstateDiscontinuedOperations" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance" xlink:label="us-gaap_DeferredTaxAssetsValuationAllowance" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:to="us-gaap_DeferredTaxAssetsValuationAllowance" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LoansAndLeasesReceivableGrossCarryingAmount" xlink:label="us-gaap_LoansAndLeasesReceivableGrossCarryingAmount" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:to="us-gaap_LoansAndLeasesReceivableGrossCarryingAmount" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LoansAndLeasesReceivableNetReportedAmount" xlink:label="us-gaap_LoansAndLeasesReceivableNetReportedAmount" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:to="us-gaap_LoansAndLeasesReceivableNetReportedAmount" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MortgageLoanMaturityPeriod" xlink:label="cli_MortgageLoanMaturityPeriod" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:to="cli_MortgageLoanMaturityPeriod" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DiscontinuedOperationsAssetImpairmentCharges" xlink:label="cli_DiscontinuedOperationsAssetImpairmentCharges" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:to="cli_DiscontinuedOperationsAssetImpairmentCharges" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DiscontinuedOperationGainsLossesOnExtinguishmentOfDebt" xlink:label="cli_DiscontinuedOperationGainsLossesOnExtinguishmentOfDebt" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:to="cli_DiscontinuedOperationGainsLossesOnExtinguishmentOfDebt" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NumberOfImpairedRealEstateProperties" xlink:label="cli_NumberOfImpairedRealEstateProperties" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:to="cli_NumberOfImpairedRealEstateProperties" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NumberOfLandParcelsSold" xlink:label="cli_NumberOfLandParcelsSold" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:to="cli_NumberOfLandParcelsSold" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesNarrativeDetails" xlink:type="extended" xlink:title="40401 - Disclosure - Investments In Unconsolidated Joint Ventures (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorPropertyClassAxis" xlink:label="us-gaap_MajorPropertyClassAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_MajorPropertyClassAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorPropertyClassDomain" xlink:label="us-gaap_MajorPropertyClassDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_MajorPropertyClassAxis" xlink:to="us-gaap_MajorPropertyClassDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorPropertyClassDomain" xlink:label="us-gaap_MajorPropertyClassDomain_635181354720500033" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="us-gaap_MajorPropertyClassAxis" xlink:to="us-gaap_MajorPropertyClassDomain_635181354720500033" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ApartmentsMember" xlink:label="cli_ApartmentsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_MajorPropertyClassDomain" xlink:to="cli_ApartmentsMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OfficeBuildingMember" xlink:label="us-gaap_OfficeBuildingMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_MajorPropertyClassDomain" xlink:to="us-gaap_OfficeBuildingMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis" xlink:label="us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassificationOfVariableInterestEntityDomain" xlink:label="us-gaap_ClassificationOfVariableInterestEntityDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis" xlink:to="us-gaap_ClassificationOfVariableInterestEntityDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassificationOfVariableInterestEntityDomain" xlink:label="us-gaap_ClassificationOfVariableInterestEntityDomain_635181354720510030" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis" xlink:to="us-gaap_ClassificationOfVariableInterestEntityDomain_635181354720510030" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember" xlink:label="us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_ClassificationOfVariableInterestEntityDomain" xlink:to="us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="us-gaap_RangeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_RangeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="us-gaap_RangeMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RangeAxis" xlink:to="us-gaap_RangeMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinimumMember" xlink:label="us-gaap_MinimumMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RangeMember" xlink:to="us-gaap_MinimumMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MaximumMember" xlink:label="us-gaap_MaximumMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_RangeMember" xlink:to="us-gaap_MaximumMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis" xlink:label="us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain" xlink:label="us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis" xlink:to="us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_UnconsolidatedJointVentureOfficeBuildingsMember" xlink:label="cli_UnconsolidatedJointVentureOfficeBuildingsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain" xlink:to="cli_UnconsolidatedJointVentureOfficeBuildingsMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_UnconsolidatedJointVentureOfficeAndRetailBuildingsMember" xlink:label="cli_UnconsolidatedJointVentureOfficeAndRetailBuildingsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain" xlink:to="cli_UnconsolidatedJointVentureOfficeAndRetailBuildingsMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_UnconsolidatedJointVentureRetailBuildingsMember" xlink:label="cli_UnconsolidatedJointVentureRetailBuildingsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain" xlink:to="cli_UnconsolidatedJointVentureRetailBuildingsMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_UnconsolidatedJointVentureMultipleFamilyPropertiesMember" xlink:label="cli_UnconsolidatedJointVentureMultipleFamilyPropertiesMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain" xlink:to="cli_UnconsolidatedJointVentureMultipleFamilyPropertiesMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_UnconsolidatedJointVentureHotelMember" xlink:label="cli_UnconsolidatedJointVentureHotelMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain" xlink:to="cli_UnconsolidatedJointVentureHotelMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_UnconsolidatedJointVentureCommercialPropertyMember" xlink:label="cli_UnconsolidatedJointVentureCommercialPropertyMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain" xlink:to="cli_UnconsolidatedJointVentureCommercialPropertyMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_UnconsolidatedJointVentureDevelopmentProjectsMember" xlink:label="cli_UnconsolidatedJointVentureDevelopmentProjectsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain" xlink:to="cli_UnconsolidatedJointVentureDevelopmentProjectsMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_UnconsolidatedJointVentureLandParcelsMember" xlink:label="cli_UnconsolidatedJointVentureLandParcelsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain" xlink:to="cli_UnconsolidatedJointVentureLandParcelsMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures" xlink:label="us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfRealEstateProperties" xlink:label="us-gaap_NumberOfRealEstateProperties" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_NumberOfRealEstateProperties" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AreaOfRealEstateProperty" xlink:label="us-gaap_AreaOfRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_AreaOfRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfUnitsInRealEstateProperty" xlink:label="us-gaap_NumberOfUnitsInRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_NumberOfUnitsInRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="us-gaap_EquityMethodInvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_EquityMethodInvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DueFromJointVentures" xlink:label="us-gaap_DueFromJointVentures" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DueFromJointVentures" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NumberOfVariableInterestEntities" xlink:label="cli_NumberOfVariableInterestEntities" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_NumberOfVariableInterestEntities" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount" xlink:label="us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_VariableInterestEntityEntityEstimatedFutureFundingCommitments" xlink:label="cli_VariableInterestEntityEntityEstimatedFutureFundingCommitments" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_VariableInterestEntityEntityEstimatedFutureFundingCommitments" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesSummaryOfCompanySInvestmentInUnconsolidatedJointVenturesDetails" xlink:type="extended" xlink:title="40403 - Disclosure - Investments In Unconsolidated Joint Ventures (Summary Of Company's Investment In Unconsolidated Joint Ventures) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PlazaEightAndNineAssociatesLLCMember" xlink:label="cli_PlazaEightAndNineAssociatesLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_PlazaEightAndNineAssociatesLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_SouthPierAtHarborsideMember" xlink:label="cli_SouthPierAtHarborsideMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_SouthPierAtHarborsideMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RedBankCorporatePlazaLLCMember" xlink:label="cli_RedBankCorporatePlazaLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_RedBankCorporatePlazaLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_TwelveVreelandAssociatesLLCMember" xlink:label="cli_TwelveVreelandAssociatesLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_TwelveVreelandAssociatesLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_BostonDowntownCrossingMember" xlink:label="cli_BostonDowntownCrossingMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_BostonDowntownCrossingMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_GaleJeffersonLLCMember" xlink:label="cli_GaleJeffersonLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_GaleJeffersonLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_StamfordSmLlcMember" xlink:label="cli_StamfordSmLlcMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_StamfordSmLlcMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MarbellaRoseGardenLLCMember" xlink:label="cli_MarbellaRoseGardenLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_MarbellaRoseGardenLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RoseGardenMonacoHoldingsLLCMember" xlink:label="cli_RoseGardenMonacoHoldingsLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_RoseGardenMonacoHoldingsLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RosewoodLafayetteHoldingsLLCMember" xlink:label="cli_RosewoodLafayetteHoldingsLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_RosewoodLafayetteHoldingsLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PruRosePortImperialSouthFifteenLLCMember" xlink:label="cli_PruRosePortImperialSouthFifteenLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_PruRosePortImperialSouthFifteenLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RosewoodMorristownLLCMember" xlink:label="cli_RosewoodMorristownLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_RosewoodMorristownLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_OverlookRidgeJVLLCMember" xlink:label="cli_OverlookRidgeJVLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_OverlookRidgeJVLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_OverlookRidgeJvTwoCAndThreeBLLCMember" xlink:label="cli_OverlookRidgeJvTwoCAndThreeBLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_OverlookRidgeJvTwoCAndThreeBLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RoselandNorthRetailLLCMember" xlink:label="cli_RoselandNorthRetailLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="15" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_RoselandNorthRetailLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_BNESAssociatesIIIMember" xlink:label="cli_BNESAssociatesIIIMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="16" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_BNESAssociatesIIIMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PortsideMasterCompanyLLCMember" xlink:label="cli_PortsideMasterCompanyLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="17" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_PortsideMasterCompanyLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PruRosePortImperialSouthThirteenLLCMember" xlink:label="cli_PruRosePortImperialSouthThirteenLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="18" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_PruRosePortImperialSouthThirteenLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RoselandPortImperialPartnersLPMember" xlink:label="cli_RoselandPortImperialPartnersLPMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="19" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_RoselandPortImperialPartnersLPMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RoseGardenMarbellaSouthLLCMember" xlink:label="cli_RoseGardenMarbellaSouthLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="20" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_RoseGardenMarbellaSouthLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PruRoseRiverwalkGLLCMember" xlink:label="cli_PruRoseRiverwalkGLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="21" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_PruRoseRiverwalkGLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ElmajoUrbanRenewalAssociatesLLCMember" xlink:label="cli_ElmajoUrbanRenewalAssociatesLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="22" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_ElmajoUrbanRenewalAssociatesLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_EstuaryUrbanRenewalUnitBLLCMember" xlink:label="cli_EstuaryUrbanRenewalUnitBLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="23" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_EstuaryUrbanRenewalUnitBLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RiverparkAtHarrisonILLCMember" xlink:label="cli_RiverparkAtHarrisonILLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="24" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_RiverparkAtHarrisonILLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_OneHundredFiftyMainStreetLLCMember" xlink:label="cli_OneHundredFiftyMainStreetLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="25" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_OneHundredFiftyMainStreetLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RoseGardenMonacoLLCMember" xlink:label="cli_RoseGardenMonacoLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="26" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_RoseGardenMonacoLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HillsboroughTwoHundredSixHoldingsLLCMember" xlink:label="cli_HillsboroughTwoHundredSixHoldingsLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="27" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_HillsboroughTwoHundredSixHoldingsLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_GrandJerseyWaterfrontUrbanRenewalAssociatesLLCMember" xlink:label="cli_GrandJerseyWaterfrontUrbanRenewalAssociatesLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="28" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_GrandJerseyWaterfrontUrbanRenewalAssociatesLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_CrystalHouseApartmentsInvestorsLLCMember" xlink:label="cli_CrystalHouseApartmentsInvestorsLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="29" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_CrystalHouseApartmentsInvestorsLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_OtherJointVenturesMember" xlink:label="cli_OtherJointVenturesMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="30" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_OtherJointVenturesMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures" xlink:label="us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesSummaryOfCompanySEquityInEarningsLossOfUnconsolidatedJointVenturesDetails" xlink:type="extended" xlink:title="40405 - Disclosure - Investments In Unconsolidated Joint Ventures (Summary Of Company's Equity In Earnings (Loss) Of Unconsolidated Joint Ventures) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PlazaEightAndNineAssociatesLLCMember" xlink:label="cli_PlazaEightAndNineAssociatesLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_PlazaEightAndNineAssociatesLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_SouthPierAtHarborsideMember" xlink:label="cli_SouthPierAtHarborsideMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_SouthPierAtHarborsideMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RedBankCorporatePlazaLLCMember" xlink:label="cli_RedBankCorporatePlazaLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_RedBankCorporatePlazaLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_TwelveVreelandAssociatesLLCMember" xlink:label="cli_TwelveVreelandAssociatesLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_TwelveVreelandAssociatesLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_BostonDowntownCrossingMember" xlink:label="cli_BostonDowntownCrossingMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_BostonDowntownCrossingMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_GaleJeffersonLLCMember" xlink:label="cli_GaleJeffersonLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_GaleJeffersonLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_StamfordSmLlcMember" xlink:label="cli_StamfordSmLlcMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_StamfordSmLlcMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MarbellaRoseGardenLLCMember" xlink:label="cli_MarbellaRoseGardenLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_MarbellaRoseGardenLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RoseGardenMonacoHoldingsLLCMember" xlink:label="cli_RoseGardenMonacoHoldingsLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_RoseGardenMonacoHoldingsLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RosewoodLafayetteHoldingsLLCMember" xlink:label="cli_RosewoodLafayetteHoldingsLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_RosewoodLafayetteHoldingsLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PruRosePortImperialSouthFifteenLLCMember" xlink:label="cli_PruRosePortImperialSouthFifteenLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_PruRosePortImperialSouthFifteenLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RosewoodMorristownLLCMember" xlink:label="cli_RosewoodMorristownLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_RosewoodMorristownLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_OverlookRidgeJvTwoCAndThreeBLLCMember" xlink:label="cli_OverlookRidgeJvTwoCAndThreeBLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_OverlookRidgeJvTwoCAndThreeBLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RoselandNorthRetailLLCMember" xlink:label="cli_RoselandNorthRetailLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_RoselandNorthRetailLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_BNESAssociatesIIIMember" xlink:label="cli_BNESAssociatesIIIMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="15" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_BNESAssociatesIIIMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PortsideMasterCompanyLLCMember" xlink:label="cli_PortsideMasterCompanyLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="16" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_PortsideMasterCompanyLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PruRosePortImperialSouthThirteenLLCMember" xlink:label="cli_PruRosePortImperialSouthThirteenLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="17" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_PruRosePortImperialSouthThirteenLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RoseGardenMarbellaSouthLLCMember" xlink:label="cli_RoseGardenMarbellaSouthLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="18" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_RoseGardenMarbellaSouthLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PruRoseRiverwalkGLLCMember" xlink:label="cli_PruRoseRiverwalkGLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="19" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_PruRoseRiverwalkGLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ElmajoUrbanRenewalAssociatesLLCMember" xlink:label="cli_ElmajoUrbanRenewalAssociatesLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="20" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_ElmajoUrbanRenewalAssociatesLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_EstuaryUrbanRenewalUnitBLLCMember" xlink:label="cli_EstuaryUrbanRenewalUnitBLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="21" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_EstuaryUrbanRenewalUnitBLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_CrystalHouseApartmentsInvestorsLLCMember" xlink:label="cli_CrystalHouseApartmentsInvestorsLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="22" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_CrystalHouseApartmentsInvestorsLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_OtherJointVenturesMember" xlink:label="cli_OtherJointVenturesMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="23" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_OtherJointVenturesMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestments" xlink:label="us-gaap_IncomeLossFromEquityMethodInvestments" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_IncomeLossFromEquityMethodInvestments" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesPlazaViiiAndIxAssociatesLLCNarrativeDetails" xlink:type="extended" xlink:title="40406 - Disclosure - Investments In Unconsolidated Joint Ventures (Plaza VIII And IX Associates, L.L.C.) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PlazaEightAndNineAssociatesLLCMember" xlink:label="cli_PlazaEightAndNineAssociatesLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_PlazaEightAndNineAssociatesLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="us-gaap_EquityMethodInvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_EquityMethodInvestmentOwnershipPercentage" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesSouthPierAtHarborsideHotelNarrativeDetails" xlink:type="extended" xlink:title="40407 - Disclosure - Investments In Unconsolidated Joint Ventures (South Pier At Harborside - Hotel) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_SouthPierAtHarborsideMember" xlink:label="cli_SouthPierAtHarborsideMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_SouthPierAtHarborsideMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfUnitsInRealEstateProperty" xlink:label="us-gaap_NumberOfUnitsInRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_NumberOfUnitsInRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="us-gaap_EquityMethodInvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_EquityMethodInvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" xlink:label="us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentInterestRateStatedPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MortgageLoanMaturityDate" xlink:label="cli_MortgageLoanMaturityDate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_MortgageLoanMaturityDate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_LoanCarryingAmount" xlink:label="cli_LoanCarryingAmount" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_LoanCarryingAmount" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMinimum" xlink:label="us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMinimum" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMinimum" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMaximum" xlink:label="us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMaximum" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMaximum" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="us-gaap_DebtInstrumentMaturityDate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentMaturityDate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_LineOfCreditFacilityInSupportOfDebtInstrumentFairValueOfAmountOutstanding" xlink:label="cli_LineOfCreditFacilityInSupportOfDebtInstrumentFairValueOfAmountOutstanding" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_LineOfCreditFacilityInSupportOfDebtInstrumentFairValueOfAmountOutstanding" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesRedBankCorporatePlazaLLCNarrativeDetails" xlink:type="extended" xlink:title="40408 - Disclosure - Investments In Unconsolidated Joint Ventures (Red Bank Corporate Plaza, L.L.C.) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RedBankCorporatePlazaLLCMember" xlink:label="cli_RedBankCorporatePlazaLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_RedBankCorporatePlazaLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AreaOfRealEstateProperty" xlink:label="us-gaap_AreaOfRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_AreaOfRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LeaseExpirationDate1" xlink:label="us-gaap_LeaseExpirationDate1" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_LeaseExpirationDate1" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="us-gaap_EquityMethodInvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_EquityMethodInvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" xlink:label="us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MortgageLoanMaturityDate" xlink:label="cli_MortgageLoanMaturityDate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_MortgageLoanMaturityDate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_LIBORInterestRate" xlink:label="cli_LIBORInterestRate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_LIBORInterestRate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfLoanThatHasFixedInterestRate" xlink:label="cli_PercentageOfLoanThatHasFixedInterestRate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfLoanThatHasFixedInterestRate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebtPercentageBearingFixedInterestRate" xlink:label="us-gaap_LongTermDebtPercentageBearingFixedInterestRate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_LongTermDebtPercentageBearingFixedInterestRate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ManagementLeasingAndOtherServicesFees" xlink:label="cli_ManagementLeasingAndOtherServicesFees" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ManagementLeasingAndOtherServicesFees" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVentures12VreelandAssociatesLLCNarrativeDetails" xlink:type="extended" xlink:title="40409 - Disclosure - Investments In Unconsolidated Joint Ventures (12 Vreeland Associates, L.L.C.) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_TwelveVreelandAssociatesLLCMember" xlink:label="cli_TwelveVreelandAssociatesLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_TwelveVreelandAssociatesLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="us-gaap_EquityMethodInvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_EquityMethodInvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AreaOfRealEstateProperty" xlink:label="us-gaap_AreaOfRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_AreaOfRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" xlink:label="us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentInterestRateStatedPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MortgageLoanMaturityDate" xlink:label="cli_MortgageLoanMaturityDate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_MortgageLoanMaturityDate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DistributionOfLoanProceeds" xlink:label="cli_DistributionOfLoanProceeds" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DistributionOfLoanProceeds" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ShareOfDistributionOfLoanProceeds" xlink:label="cli_ShareOfDistributionOfLoanProceeds" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ShareOfDistributionOfLoanProceeds" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ThirdPartyOwnershipPercent" xlink:label="cli_ThirdPartyOwnershipPercent" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ThirdPartyOwnershipPercent" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HoldingAndDistributionPatternUnderOperatingAgreement" xlink:label="cli_HoldingAndDistributionPatternUnderOperatingAgreement" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_HoldingAndDistributionPatternUnderOperatingAgreement" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesBostonDowntownCrossingNarrativeDetails" xlink:type="extended" xlink:title="40410 - Disclosure - Investments In Unconsolidated Joint Ventures (Boston-Downtown Crossing) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_BostonDowntownCrossingMember" xlink:label="cli_BostonDowntownCrossingMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_BostonDowntownCrossingMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AreaOfRealEstateProperty" xlink:label="us-gaap_AreaOfRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_AreaOfRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="us-gaap_EquityMethodInvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_EquityMethodInvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_VentureSaleOfRealEstate" xlink:label="cli_VentureSaleOfRealEstate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_VentureSaleOfRealEstate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ShareOfGainOnSaleOfRealEstate" xlink:label="cli_ShareOfGainOnSaleOfRealEstate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ShareOfGainOnSaleOfRealEstate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GainLossOnDispositionOfRealEstateDiscontinuedOperations" xlink:label="us-gaap_GainLossOnDispositionOfRealEstateDiscontinuedOperations" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_GainLossOnDispositionOfRealEstateDiscontinuedOperations" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesGaleJeffersonLLCNarrativeDetails" xlink:type="extended" xlink:title="40411 - Disclosure - Investments In Unconsolidated Joint Ventures (Gale Jefferson, L.L.C.) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_OneJeffersonMember" xlink:label="cli_OneJeffersonMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_OneJeffersonMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_GaleJeffersonLLCMember" xlink:label="cli_GaleJeffersonLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_GaleJeffersonLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="us-gaap_EquityMethodInvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_EquityMethodInvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AreaOfRealEstateProperty" xlink:label="us-gaap_AreaOfRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_AreaOfRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LeaseExpirationDate1" xlink:label="us-gaap_LeaseExpirationDate1" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_LeaseExpirationDate1" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" xlink:label="us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MortgageLoanMaturityDate" xlink:label="cli_MortgageLoanMaturityDate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_MortgageLoanMaturityDate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_VentureSaleOfRealEstate" xlink:label="cli_VentureSaleOfRealEstate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_VentureSaleOfRealEstate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ShareOfGainOnSaleOfRealEstate" xlink:label="cli_ShareOfGainOnSaleOfRealEstate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ShareOfGainOnSaleOfRealEstate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GainLossOnDispositionOfRealEstateDiscontinuedOperations" xlink:label="us-gaap_GainLossOnDispositionOfRealEstateDiscontinuedOperations" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_GainLossOnDispositionOfRealEstateDiscontinuedOperations" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ManagementLeasingAndOtherServicesFees" xlink:label="cli_ManagementLeasingAndOtherServicesFees" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ManagementLeasingAndOtherServicesFees" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesStamfordSmLlcNarrativeDetails" xlink:type="extended" xlink:title="40412 - Disclosure - Investments In Unconsolidated Joint Ventures (Stamford SM LLC) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="us-gaap_DebtInstrumentAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_DebtInstrumentAxis" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="us-gaap_DebtInstrumentNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_DebtInstrumentAxis" xlink:to="us-gaap_DebtInstrumentNameDomain" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="us-gaap_DebtInstrumentNameDomain_635181354720759955" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="us-gaap_DebtInstrumentAxis" xlink:to="us-gaap_DebtInstrumentNameDomain_635181354720759955" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MezzLoanMember" xlink:label="cli_MezzLoanMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="cli_MezzLoanMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_StamfordSMLLCMember" xlink:label="cli_StamfordSMLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_StamfordSMLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstatePropertiesAxis" xlink:label="us-gaap_RealEstatePropertiesAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_RealEstatePropertiesAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstatePropertiesDomain" xlink:label="us-gaap_RealEstatePropertiesDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RealEstatePropertiesAxis" xlink:to="us-gaap_RealEstatePropertiesDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstatePropertiesDomain" xlink:label="us-gaap_RealEstatePropertiesDomain_635181354720769952" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="us-gaap_RealEstatePropertiesAxis" xlink:to="us-gaap_RealEstatePropertiesDomain_635181354720769952" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ClassPortfolioInStamfordConnecticutMember" xlink:label="cli_ClassPortfolioInStamfordConnecticutMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RealEstatePropertiesDomain" xlink:to="cli_ClassPortfolioInStamfordConnecticutMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ClassOfficeSpaceMember" xlink:label="cli_ClassOfficeSpaceMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_RealEstatePropertiesDomain" xlink:to="cli_ClassOfficeSpaceMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ResidentialSpaceMember" xlink:label="cli_ResidentialSpaceMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_RealEstatePropertiesDomain" xlink:to="cli_ResidentialSpaceMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AreaOfRealEstateProperty" xlink:label="us-gaap_AreaOfRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_AreaOfRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_VenturePropertyAcquisitionCost" xlink:label="cli_VenturePropertyAcquisitionCost" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_VenturePropertyAcquisitionCost" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages" xlink:label="us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfRealEstateProperties" xlink:label="us-gaap_NumberOfRealEstateProperties" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_NumberOfRealEstateProperties" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfUnitsInRealEstateProperty" xlink:label="us-gaap_NumberOfUnitsInRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_NumberOfUnitsInRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" xlink:label="us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ThresholdOfWhichExcessProceedsArePaidToThirdParty" xlink:label="cli_ThresholdOfWhichExcessProceedsArePaidToThirdParty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ThresholdOfWhichExcessProceedsArePaidToThirdParty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageLoanOnRealEstateFinalMaturityDate" xlink:label="us-gaap_MortgageLoanOnRealEstateFinalMaturityDate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_MortgageLoanOnRealEstateFinalMaturityDate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtInstrumentExtensionPeriod" xlink:label="cli_DebtInstrumentExtensionPeriod" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DebtInstrumentExtensionPeriod" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="us-gaap_EquityMethodInvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_EquityMethodInvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ThirdPartyOwnershipPercent" xlink:label="cli_ThirdPartyOwnershipPercent" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ThirdPartyOwnershipPercent" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HoldingAndDistributionPatternUnderOperatingAgreement" xlink:label="cli_HoldingAndDistributionPatternUnderOperatingAgreement" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_HoldingAndDistributionPatternUnderOperatingAgreement" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesMarbellaRosegardenLLCNarrativeDetails" xlink:type="extended" xlink:title="40413 - Disclosure - Investments In Unconsolidated Joint Ventures (Marbella RoseGarden, L.L.C.) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" xlink:label="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" xlink:label="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" xlink:to="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" xlink:label="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain_635181354720799943" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" xlink:to="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain_635181354720799943" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MarbellaRoseGardenSInterestInPruRoseMarbellaIMember" xlink:label="cli_MarbellaRoseGardenSInterestInPruRoseMarbellaIMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" xlink:to="cli_MarbellaRoseGardenSInterestInPruRoseMarbellaIMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MarbellaRoseGardenLLCMember" xlink:label="cli_MarbellaRoseGardenLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_MarbellaRoseGardenLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="dei_LegalEntityAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PrudentialMarbellaPartnershipMember" xlink:label="cli_PrudentialMarbellaPartnershipMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="dei_EntityDomain" xlink:to="cli_PrudentialMarbellaPartnershipMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PruRoseMarbellaILLCMember" xlink:label="cli_PruRoseMarbellaILLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="dei_EntityDomain" xlink:to="cli_PruRoseMarbellaILLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_IndirectResidualOwnershipPercentage" xlink:label="cli_IndirectResidualOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_IndirectResidualOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfUnitsInRealEstateProperty" xlink:label="us-gaap_NumberOfUnitsInRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_NumberOfUnitsInRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NumberOfStoriesInRealEstateProperty" xlink:label="cli_NumberOfStoriesInRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_NumberOfStoriesInRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AreaOfRealEstateProperty" xlink:label="us-gaap_AreaOfRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_AreaOfRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="us-gaap_EquityMethodInvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_EquityMethodInvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentOwnershipPercentage" xlink:label="cli_InvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_InvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfOperatingReturnOnCapital" xlink:label="cli_PercentageOfOperatingReturnOnCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfOperatingReturnOnCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PartnersCapital" xlink:label="us-gaap_PartnersCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_PartnersCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AccumulatedUnpaidOperatingReturn" xlink:label="cli_AccumulatedUnpaidOperatingReturn" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_AccumulatedUnpaidOperatingReturn" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" xlink:label="us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentInterestRateStatedPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MortgageLoanMaturityDate" xlink:label="cli_MortgageLoanMaturityDate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_MortgageLoanMaturityDate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ManagementLeasingAndOtherServicesFees" xlink:label="cli_ManagementLeasingAndOtherServicesFees" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ManagementLeasingAndOtherServicesFees" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HoldingAndDistributionPatternUnderOperatingAgreement" xlink:label="cli_HoldingAndDistributionPatternUnderOperatingAgreement" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="15" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_HoldingAndDistributionPatternUnderOperatingAgreement" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesRosegardenMonacoHoldingsLLCNarrativeDetails" xlink:type="extended" xlink:title="40414 - Disclosure - Investments In Unconsolidated Joint Ventures (RoseGarden Monaco Holdings, L.L.C.) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" xlink:label="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" xlink:label="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" xlink:to="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RoseGardenMonacoHoldingsInterestInMonacoHoldingsMember" xlink:label="cli_RoseGardenMonacoHoldingsInterestInMonacoHoldingsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" xlink:to="cli_RoseGardenMonacoHoldingsInterestInMonacoHoldingsMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MonacoHoldingsInterestInPruRoseMonacoHoldingsMember" xlink:label="cli_MonacoHoldingsInterestInPruRoseMonacoHoldingsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" xlink:to="cli_MonacoHoldingsInterestInPruRoseMonacoHoldingsMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RoseGardenMonacoHoldingsLLCMember" xlink:label="cli_RoseGardenMonacoHoldingsLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_RoseGardenMonacoHoldingsLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="dei_LegalEntityAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PruRoseMonacoHoldingsLLCMember" xlink:label="cli_PruRoseMonacoHoldingsLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="dei_EntityDomain" xlink:to="cli_PruRoseMonacoHoldingsLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PrudentialInsuranceCompanyOfAmericaMember" xlink:label="cli_PrudentialInsuranceCompanyOfAmericaMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="dei_EntityDomain" xlink:to="cli_PrudentialInsuranceCompanyOfAmericaMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_IndirectResidualOwnershipPercentage" xlink:label="cli_IndirectResidualOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_IndirectResidualOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfRealEstateProperties" xlink:label="us-gaap_NumberOfRealEstateProperties" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_NumberOfRealEstateProperties" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NumberOfStoriesInRealEstateProperty" xlink:label="cli_NumberOfStoriesInRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_NumberOfStoriesInRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfUnitsInRealEstateProperty" xlink:label="us-gaap_NumberOfUnitsInRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_NumberOfUnitsInRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AreaOfRealEstateProperty" xlink:label="us-gaap_AreaOfRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_AreaOfRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="us-gaap_EquityMethodInvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_EquityMethodInvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentOwnershipPercentage" xlink:label="cli_InvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_InvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfOperatingReturnOnCapital" xlink:label="cli_PercentageOfOperatingReturnOnCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfOperatingReturnOnCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PartnersCapital" xlink:label="us-gaap_PartnersCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_PartnersCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AccumulatedUnpaidOperatingReturn" xlink:label="cli_AccumulatedUnpaidOperatingReturn" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_AccumulatedUnpaidOperatingReturn" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" xlink:label="us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentInterestRateStatedPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MortgageLoanMaturityDate" xlink:label="cli_MortgageLoanMaturityDate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_MortgageLoanMaturityDate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ManagementLeasingAndOtherServicesFees" xlink:label="cli_ManagementLeasingAndOtherServicesFees" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="15" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ManagementLeasingAndOtherServicesFees" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HoldingAndDistributionPatternUnderOperatingAgreement" xlink:label="cli_HoldingAndDistributionPatternUnderOperatingAgreement" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="16" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_HoldingAndDistributionPatternUnderOperatingAgreement" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesRosewoodLafayetteHoldingsLLCNarrativeDetails" xlink:type="extended" xlink:title="40415 - Disclosure - Investments In Unconsolidated Joint Ventures (Rosewood Lafayette Holdings, L.L.C.) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RosewoodLafayetteHoldingsLLCMember" xlink:label="cli_RosewoodLafayetteHoldingsLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_RosewoodLafayetteHoldingsLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" xlink:label="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" xlink:label="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" xlink:to="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RosewoodLafayatteHoldingsInterestInRosewoodLafayetteCommonsMember" xlink:label="cli_RosewoodLafayatteHoldingsInterestInRosewoodLafayetteCommonsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" xlink:to="cli_RosewoodLafayatteHoldingsInterestInRosewoodLafayetteCommonsMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="dei_LegalEntityAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RosewoodLafayetteCommonsLLCMember" xlink:label="cli_RosewoodLafayetteCommonsLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="dei_EntityDomain" xlink:to="cli_RosewoodLafayetteCommonsLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PrudentialMember" xlink:label="cli_PrudentialMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="dei_EntityDomain" xlink:to="cli_PrudentialMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_IndirectResidualOwnershipPercentage" xlink:label="cli_IndirectResidualOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_IndirectResidualOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfUnitsInRealEstateProperty" xlink:label="us-gaap_NumberOfUnitsInRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_NumberOfUnitsInRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AreaOfRealEstateProperty" xlink:label="us-gaap_AreaOfRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_AreaOfRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="us-gaap_EquityMethodInvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_EquityMethodInvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentOwnershipPercentage" xlink:label="cli_InvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_InvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfOperatingReturnOnCapital" xlink:label="cli_PercentageOfOperatingReturnOnCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfOperatingReturnOnCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PartnersCapital" xlink:label="us-gaap_PartnersCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_PartnersCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AccumulatedUnpaidOperatingReturn" xlink:label="cli_AccumulatedUnpaidOperatingReturn" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_AccumulatedUnpaidOperatingReturn" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" xlink:label="us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentInterestRateStatedPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MortgageLoanMaturityDate" xlink:label="cli_MortgageLoanMaturityDate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_MortgageLoanMaturityDate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MortgageLoansAmortizationPeriod" xlink:label="cli_MortgageLoansAmortizationPeriod" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_MortgageLoansAmortizationPeriod" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ManagementLeasingAndOtherServicesFees" xlink:label="cli_ManagementLeasingAndOtherServicesFees" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ManagementLeasingAndOtherServicesFees" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HoldingAndDistributionPatternUnderOperatingAgreement" xlink:label="cli_HoldingAndDistributionPatternUnderOperatingAgreement" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="15" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_HoldingAndDistributionPatternUnderOperatingAgreement" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesPrurosePortImperialSouth15LLCNarrativeDetails" xlink:type="extended" xlink:title="40416 - Disclosure - Investments In Unconsolidated Joint Ventures (PruRose Port Imperial South 15, L.L.C) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="us-gaap_DebtInstrumentAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_DebtInstrumentAxis" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="us-gaap_DebtInstrumentNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_DebtInstrumentAxis" xlink:to="us-gaap_DebtInstrumentNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RefinanceLoanMember" xlink:label="cli_RefinanceLoanMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="cli_RefinanceLoanMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PruRosePortImperialSouthFifteenLLCMember" xlink:label="cli_PruRosePortImperialSouthFifteenLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_PruRosePortImperialSouthFifteenLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="dei_LegalEntityAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PrudentialPortMember" xlink:label="cli_PrudentialPortMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="dei_EntityDomain" xlink:to="cli_PrudentialPortMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="us-gaap_EquityMethodInvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_EquityMethodInvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfUnitsInRealEstateProperty" xlink:label="us-gaap_NumberOfUnitsInRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_NumberOfUnitsInRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AreaOfRealEstateProperty" xlink:label="us-gaap_AreaOfRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_AreaOfRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ThirdPartyOwnershipPercent" xlink:label="cli_ThirdPartyOwnershipPercent" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ThirdPartyOwnershipPercent" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfOperatingReturnOnCapital" xlink:label="cli_PercentageOfOperatingReturnOnCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfOperatingReturnOnCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PartnersCapital" xlink:label="us-gaap_PartnersCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_PartnersCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AccumulatedUnpaidOperatingReturn" xlink:label="cli_AccumulatedUnpaidOperatingReturn" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_AccumulatedUnpaidOperatingReturn" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentOfDistributionsPaidToThirdPartyAfterThresholdReached" xlink:label="cli_PercentOfDistributionsPaidToThirdPartyAfterThresholdReached" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentOfDistributionsPaidToThirdPartyAfterThresholdReached" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ThresholdOfInternalRateOfReturnForDistributionsToThirdParty" xlink:label="cli_ThresholdOfInternalRateOfReturnForDistributionsToThirdParty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ThresholdOfInternalRateOfReturnForDistributionsToThirdParty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" xlink:label="us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MortgageLoanMaturityDate" xlink:label="cli_MortgageLoanMaturityDate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_MortgageLoanMaturityDate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtInstrumentExtensionPeriod" xlink:label="cli_DebtInstrumentExtensionPeriod" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DebtInstrumentExtensionPeriod" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtInstrumentExtensionFeePercentage" xlink:label="cli_DebtInstrumentExtensionFeePercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="15" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DebtInstrumentExtensionFeePercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="16" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentInterestRateStatedPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ManagementLeasingAndOtherServicesFees" xlink:label="cli_ManagementLeasingAndOtherServicesFees" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="17" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ManagementLeasingAndOtherServicesFees" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HoldingAndDistributionPatternUnderOperatingAgreement" xlink:label="cli_HoldingAndDistributionPatternUnderOperatingAgreement" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="18" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_HoldingAndDistributionPatternUnderOperatingAgreement" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesRosewoodMorristownLLCNarrativeDetails" xlink:type="extended" xlink:title="40417 - Disclosure - Investments In Unconsolidated Joint Ventures (Rosewood Morristown, L.L.C.) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="us-gaap_StatementScenarioAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_StatementScenarioAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="us-gaap_ScenarioUnspecifiedDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_StatementScenarioAxis" xlink:to="us-gaap_ScenarioUnspecifiedDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="us-gaap_ScenarioUnspecifiedDomain_635181354720979889" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="us-gaap_StatementScenarioAxis" xlink:to="us-gaap_ScenarioUnspecifiedDomain_635181354720979889" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioForecastMember" xlink:label="us-gaap_ScenarioForecastMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_ScenarioUnspecifiedDomain" xlink:to="us-gaap_ScenarioForecastMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_FortyParkCondominiumPropertyMember" xlink:label="cli_FortyParkCondominiumPropertyMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:to="cli_FortyParkCondominiumPropertyMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_LoftsAtFortyParkPropertyMember" xlink:label="cli_LoftsAtFortyParkPropertyMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:to="cli_LoftsAtFortyParkPropertyMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MetropolitanPropertyMember" xlink:label="cli_MetropolitanPropertyMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:to="cli_MetropolitanPropertyMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ShopsAtFortyParkPropertyMember" xlink:label="cli_ShopsAtFortyParkPropertyMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:to="cli_ShopsAtFortyParkPropertyMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" xlink:label="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" xlink:label="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" xlink:to="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RosewoodMorristownSInterestInMorristownEpsteinsMember" xlink:label="cli_RosewoodMorristownSInterestInMorristownEpsteinsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" xlink:to="cli_RosewoodMorristownSInterestInMorristownEpsteinsMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RosewoodMorristownLLCMember" xlink:label="cli_RosewoodMorristownLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_RosewoodMorristownLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="dei_LegalEntityAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MorristownEpsteinsLLCMember" xlink:label="cli_MorristownEpsteinsLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="dei_EntityDomain" xlink:to="cli_MorristownEpsteinsLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PrIIMorristownPrudentialLLCMember" xlink:label="cli_PrIIMorristownPrudentialLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="dei_EntityDomain" xlink:to="cli_PrIIMorristownPrudentialLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_EpsteinsBRentalsLLCMember" xlink:label="cli_EpsteinsBRentalsLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="dei_EntityDomain" xlink:to="cli_EpsteinsBRentalsLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PrudentialMember" xlink:label="cli_PrudentialMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="dei_EntityDomain" xlink:to="cli_PrudentialMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="us-gaap_EquityMethodInvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_EquityMethodInvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentOwnershipPercentage" xlink:label="cli_InvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_InvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ThirdPartyOwnershipPercent" xlink:label="cli_ThirdPartyOwnershipPercent" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ThirdPartyOwnershipPercent" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfUnitsInRealEstateProperty" xlink:label="us-gaap_NumberOfUnitsInRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_NumberOfUnitsInRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NumberOfUnsoldUnits" xlink:label="cli_NumberOfUnsoldUnits" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_NumberOfUnsoldUnits" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NumberOfStoriesInRealEstateProperty" xlink:label="cli_NumberOfStoriesInRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_NumberOfStoriesInRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AreaOfRealEstateProperty" xlink:label="us-gaap_AreaOfRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_AreaOfRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfRealEstateProperties" xlink:label="us-gaap_NumberOfRealEstateProperties" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_NumberOfRealEstateProperties" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentInterestRateStatedPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PreferredRateOfReturn" xlink:label="cli_PreferredRateOfReturn" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PreferredRateOfReturn" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NotesPayable" xlink:label="us-gaap_NotesPayable" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_NotesPayable" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AdjustedPartnersCapital" xlink:label="cli_AdjustedPartnersCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_AdjustedPartnersCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InterestInNetSalesProceeds" xlink:label="cli_InterestInNetSalesProceeds" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_InterestInNetSalesProceeds" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfOperatingReturnOnCapital" xlink:label="cli_PercentageOfOperatingReturnOnCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="15" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfOperatingReturnOnCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PartnersCapital" xlink:label="us-gaap_PartnersCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="16" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_PartnersCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AccumulatedUnpaidOperatingReturn" xlink:label="cli_AccumulatedUnpaidOperatingReturn" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="17" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_AccumulatedUnpaidOperatingReturn" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" xlink:label="us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="18" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="19" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MortgageLoanMaturityDate" xlink:label="cli_MortgageLoanMaturityDate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="20" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_MortgageLoanMaturityDate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MortgageLoanOnRealEstateAdditionalBorrowingCapacity" xlink:label="cli_MortgageLoanOnRealEstateAdditionalBorrowingCapacity" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="21" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_MortgageLoanOnRealEstateAdditionalBorrowingCapacity" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ManagementLeasingAndOtherServicesFees" xlink:label="cli_ManagementLeasingAndOtherServicesFees" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="22" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ManagementLeasingAndOtherServicesFees" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HoldingAndDistributionPatternUnderOperatingAgreement" xlink:label="cli_HoldingAndDistributionPatternUnderOperatingAgreement" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="23" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_HoldingAndDistributionPatternUnderOperatingAgreement" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesOverlookRidgeJvLLCNarrativeDetails" xlink:type="extended" xlink:title="40418 - Disclosure - Investments In Unconsolidated Joint Ventures (Overlook Ridge JV, L.L.C.) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermDebtTypeAxis" xlink:label="us-gaap_ShortTermDebtTypeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ShortTermDebtTypeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="us-gaap_ShortTermDebtTypeDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ShortTermDebtTypeAxis" xlink:to="us-gaap_ShortTermDebtTypeDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LetterOfCreditMember" xlink:label="us-gaap_LetterOfCreditMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_ShortTermDebtTypeDomain" xlink:to="us-gaap_LetterOfCreditMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SeniorLoansMember" xlink:label="us-gaap_SeniorLoansMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ShortTermDebtTypeDomain" xlink:to="us-gaap_SeniorLoansMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_JuniorLoansMember" xlink:label="us-gaap_JuniorLoansMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ShortTermDebtTypeDomain" xlink:to="us-gaap_JuniorLoansMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_QuarrystoneIPropertyMember" xlink:label="cli_QuarrystoneIPropertyMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:to="cli_QuarrystoneIPropertyMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_OverlookPhaseIIIMember" xlink:label="cli_OverlookPhaseIIIMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:to="cli_OverlookPhaseIIIMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" xlink:label="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" xlink:label="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" xlink:to="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_OverlookRidgeJVsInterestInLRJVCAssociatesMember" xlink:label="cli_OverlookRidgeJVsInterestInLRJVCAssociatesMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" xlink:to="cli_OverlookRidgeJVsInterestInLRJVCAssociatesMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_OverlookRidgeJVsInterestInLROverlookPhaseIIIMember" xlink:label="cli_OverlookRidgeJVsInterestInLROverlookPhaseIIIMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" xlink:to="cli_OverlookRidgeJVsInterestInLROverlookPhaseIIIMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_OverlookRidgeJVLLCMember" xlink:label="cli_OverlookRidgeJVLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_OverlookRidgeJVLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="dei_LegalEntityAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_LennarMassachusettsPropertiesMember" xlink:label="cli_LennarMassachusettsPropertiesMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="dei_EntityDomain" xlink:to="cli_LennarMassachusettsPropertiesMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_LRJVCAssociatesLLCMember" xlink:label="cli_LRJVCAssociatesLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="dei_EntityDomain" xlink:to="cli_LRJVCAssociatesLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_LROverlookPhaseIIILLCMember" xlink:label="cli_LROverlookPhaseIIILLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="dei_EntityDomain" xlink:to="cli_LROverlookPhaseIIILLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_IndirectResidualOwnershipPercentage" xlink:label="cli_IndirectResidualOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_IndirectResidualOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfUnitsInRealEstateProperty" xlink:label="us-gaap_NumberOfUnitsInRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_NumberOfUnitsInRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentOwnershipPercentage" xlink:label="cli_InvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_InvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AreaOfRealEstateProperty" xlink:label="us-gaap_AreaOfRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_AreaOfRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="us-gaap_EquityMethodInvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_EquityMethodInvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LoansPayable" xlink:label="us-gaap_LoansPayable" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_LoansPayable" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestPayableCurrentAndNoncurrent" xlink:label="us-gaap_InterestPayableCurrentAndNoncurrent" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_InterestPayableCurrentAndNoncurrent" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_OperatingAgreementAmountOfUnrecoveredCapitalToDetermineCashFlowDistribution" xlink:label="cli_OperatingAgreementAmountOfUnrecoveredCapitalToDetermineCashFlowDistribution" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_OperatingAgreementAmountOfUnrecoveredCapitalToDetermineCashFlowDistribution" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" xlink:label="us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MortgageLoanMaturityDate" xlink:label="cli_MortgageLoanMaturityDate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_MortgageLoanMaturityDate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtInstrumentExtensionPeriod" xlink:label="cli_DebtInstrumentExtensionPeriod" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DebtInstrumentExtensionPeriod" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtInstrumentExtensionFeePercentage" xlink:label="cli_DebtInstrumentExtensionFeePercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="15" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DebtInstrumentExtensionFeePercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AmountOfDebtGuaranteedByCompany" xlink:label="cli_AmountOfDebtGuaranteedByCompany" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="16" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_AmountOfDebtGuaranteedByCompany" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ManagementLeasingAndOtherServicesFees" xlink:label="cli_ManagementLeasingAndOtherServicesFees" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="17" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ManagementLeasingAndOtherServicesFees" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HoldingAndDistributionPatternUnderOperatingAgreement" xlink:label="cli_HoldingAndDistributionPatternUnderOperatingAgreement" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="18" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_HoldingAndDistributionPatternUnderOperatingAgreement" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesOverlookRidgeLLCNarrativeDetails" xlink:type="extended" xlink:title="40419 - Disclosure - Investments In Unconsolidated Joint Ventures (Overlook Ridge, L.L.C.) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="us-gaap_RangeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_RangeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="us-gaap_RangeMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RangeAxis" xlink:to="us-gaap_RangeMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MaximumMember" xlink:label="us-gaap_MaximumMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RangeMember" xlink:to="us-gaap_MaximumMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_OverlookRidgeLLCMember" xlink:label="cli_OverlookRidgeLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_OverlookRidgeLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="dei_LegalEntityAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RoweMember" xlink:label="cli_RoweMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="dei_EntityDomain" xlink:to="cli_RoweMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="us-gaap_EquityMethodInvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_EquityMethodInvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfOperatingReturnOnCapital" xlink:label="cli_PercentageOfOperatingReturnOnCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfOperatingReturnOnCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NotionalLandCapital" xlink:label="cli_NotionalLandCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_NotionalLandCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfNotionalLandCapitalAccount" xlink:label="cli_PercentageOfNotionalLandCapitalAccount" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfNotionalLandCapitalAccount" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageLoansOnRealEstate" xlink:label="us-gaap_MortgageLoansOnRealEstate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_MortgageLoansOnRealEstate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" xlink:label="us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MortgageLoanMaturityDate" xlink:label="cli_MortgageLoanMaturityDate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_MortgageLoanMaturityDate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtInstrumentExtensionPeriod" xlink:label="cli_DebtInstrumentExtensionPeriod" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DebtInstrumentExtensionPeriod" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtInstrumentExtensionFeePercentage" xlink:label="cli_DebtInstrumentExtensionFeePercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DebtInstrumentExtensionFeePercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HoldingAndDistributionPatternUnderOperatingAgreement" xlink:label="cli_HoldingAndDistributionPatternUnderOperatingAgreement" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_HoldingAndDistributionPatternUnderOperatingAgreement" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesOverlookRidgeJv2c3bLLCNarrativeDetails" xlink:type="extended" xlink:title="40420 - Disclosure - Investments In Unconsolidated Joint Ventures (Overlook Ridge JV 2C/3B, L.L.C.) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="us-gaap_RangeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_RangeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="us-gaap_RangeMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RangeAxis" xlink:to="us-gaap_RangeMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinimumMember" xlink:label="us-gaap_MinimumMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RangeMember" xlink:to="us-gaap_MinimumMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MaximumMember" xlink:label="us-gaap_MaximumMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_RangeMember" xlink:to="us-gaap_MaximumMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermDebtTypeAxis" xlink:label="us-gaap_ShortTermDebtTypeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ShortTermDebtTypeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="us-gaap_ShortTermDebtTypeDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ShortTermDebtTypeAxis" xlink:to="us-gaap_ShortTermDebtTypeDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ConstructionLoanMember" xlink:label="cli_ConstructionLoanMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_ShortTermDebtTypeDomain" xlink:to="cli_ConstructionLoanMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ConstructionLoanExtensionNumberOneMember" xlink:label="cli_ConstructionLoanExtensionNumberOneMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ShortTermDebtTypeDomain" xlink:to="cli_ConstructionLoanExtensionNumberOneMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ConstructionLoanExtensionNumberTwoMember" xlink:label="cli_ConstructionLoanExtensionNumberTwoMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ShortTermDebtTypeDomain" xlink:to="cli_ConstructionLoanExtensionNumberTwoMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_OverlookTwoCThreeBProjectMember" xlink:label="cli_OverlookTwoCThreeBProjectMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:to="cli_OverlookTwoCThreeBProjectMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" xlink:label="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" xlink:label="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" xlink:to="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_OverlookRidgeTwoCThreeBsInterestInOverlookRidgeApartmentsInvestorsMember" xlink:label="cli_OverlookRidgeTwoCThreeBsInterestInOverlookRidgeApartmentsInvestorsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" xlink:to="cli_OverlookRidgeTwoCThreeBsInterestInOverlookRidgeApartmentsInvestorsMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_OverlookRidgeJvTwoCAndThreeBLLCMember" xlink:label="cli_OverlookRidgeJvTwoCAndThreeBLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_OverlookRidgeJvTwoCAndThreeBLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="dei_LegalEntityAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_OverlookRidgeApartmentsInvestorsLLCMember" xlink:label="cli_OverlookRidgeApartmentsInvestorsLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="dei_EntityDomain" xlink:to="cli_OverlookRidgeApartmentsInvestorsLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_OverlookRidgeApartmentsMemberLLCMember" xlink:label="cli_OverlookRidgeApartmentsMemberLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="dei_EntityDomain" xlink:to="cli_OverlookRidgeApartmentsMemberLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RoweMember" xlink:label="cli_RoweMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="dei_EntityDomain" xlink:to="cli_RoweMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ParentCompanyMember" xlink:label="us-gaap_ParentCompanyMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="dei_EntityDomain" xlink:to="us-gaap_ParentCompanyMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_IndirectResidualOwnershipPercentage" xlink:label="cli_IndirectResidualOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_IndirectResidualOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfUnitsInRealEstateProperty" xlink:label="us-gaap_NumberOfUnitsInRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_NumberOfUnitsInRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfRealEstateProperties" xlink:label="us-gaap_NumberOfRealEstateProperties" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_NumberOfRealEstateProperties" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="us-gaap_EquityMethodInvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_EquityMethodInvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentOwnershipPercentage" xlink:label="cli_InvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_InvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_EstimatedCostOfProject" xlink:label="cli_EstimatedCostOfProject" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_EstimatedCostOfProject" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityAmountOutstanding" xlink:label="us-gaap_LineOfCreditFacilityAmountOutstanding" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_LineOfCreditFacilityAmountOutstanding" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfOperatingReturnOnCapital" xlink:label="cli_PercentageOfOperatingReturnOnCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfOperatingReturnOnCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PartnersCapital" xlink:label="us-gaap_PartnersCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_PartnersCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AccumulatedUnpaidOperatingReturn" xlink:label="cli_AccumulatedUnpaidOperatingReturn" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_AccumulatedUnpaidOperatingReturn" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfCapitalEventCashFlowsDistributed" xlink:label="cli_PercentageOfCapitalEventCashFlowsDistributed" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfCapitalEventCashFlowsDistributed" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InitialInternalRateOfReturn" xlink:label="cli_InitialInternalRateOfReturn" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_InitialInternalRateOfReturn" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfCapitalEventCashFlowsDistributedAfterInitialInternalRateOfReturnReached" xlink:label="cli_PercentageOfCapitalEventCashFlowsDistributedAfterInitialInternalRateOfReturnReached" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="15" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfCapitalEventCashFlowsDistributedAfterInitialInternalRateOfReturnReached" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InternalRateOfReturn" xlink:label="cli_InternalRateOfReturn" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="16" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_InternalRateOfReturn" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="17" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="us-gaap_DebtInstrumentMaturityDate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="18" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentMaturityDate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtInstrumentNumberOfExtensionOptions" xlink:label="cli_DebtInstrumentNumberOfExtensionOptions" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="19" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DebtInstrumentNumberOfExtensionOptions" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtInstrumentExtensionPeriod" xlink:label="cli_DebtInstrumentExtensionPeriod" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="20" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DebtInstrumentExtensionPeriod" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtInstrumentExtensionFeePercentage" xlink:label="cli_DebtInstrumentExtensionFeePercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="21" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DebtInstrumentExtensionFeePercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AmountOfDebtGuaranteedByCompany" xlink:label="cli_AmountOfDebtGuaranteedByCompany" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="22" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_AmountOfDebtGuaranteedByCompany" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ThresholdOfPaymentGuaranteeTerminationDebtServiceCoverageRatio" xlink:label="cli_ThresholdOfPaymentGuaranteeTerminationDebtServiceCoverageRatio" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="23" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ThresholdOfPaymentGuaranteeTerminationDebtServiceCoverageRatio" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfLoanThatHasFixedInterestRate" xlink:label="cli_PercentageOfLoanThatHasFixedInterestRate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="24" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfLoanThatHasFixedInterestRate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="25" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentInterestRateStatedPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageReturnOnUnrecoveredCapital" xlink:label="cli_PercentageReturnOnUnrecoveredCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="26" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageReturnOnUnrecoveredCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_UnrecoveredPartnersNotionalCapitalBalance" xlink:label="cli_UnrecoveredPartnersNotionalCapitalBalance" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="27" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_UnrecoveredPartnersNotionalCapitalBalance" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DevelopmentManagementAndOtherServicesFees" xlink:label="cli_DevelopmentManagementAndOtherServicesFees" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="28" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DevelopmentManagementAndOtherServicesFees" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HoldingAndDistributionPatternUnderOperatingAgreement" xlink:label="cli_HoldingAndDistributionPatternUnderOperatingAgreement" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="29" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_HoldingAndDistributionPatternUnderOperatingAgreement" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesRoselandNorthRetailLLCNarrativeDetails" xlink:type="extended" xlink:title="40421 - Disclosure - Investments In Unconsolidated Joint Ventures (Roseland/North Retail, L.L.C.) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RiverwalkPropertyMember" xlink:label="cli_RiverwalkPropertyMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:to="cli_RiverwalkPropertyMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RoselandNorthRetailLLCMember" xlink:label="cli_RoselandNorthRetailLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_RoselandNorthRetailLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="dei_LegalEntityAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PortImperialNorthRetailLLCMember" xlink:label="cli_PortImperialNorthRetailLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="dei_EntityDomain" xlink:to="cli_PortImperialNorthRetailLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PRIIPortImperialRetailLLCMember" xlink:label="cli_PRIIPortImperialRetailLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="dei_EntityDomain" xlink:to="cli_PRIIPortImperialRetailLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ParentCompanyMember" xlink:label="us-gaap_ParentCompanyMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="dei_EntityDomain" xlink:to="us-gaap_ParentCompanyMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ResidualOwnershipInterest" xlink:label="cli_ResidualOwnershipInterest" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ResidualOwnershipInterest" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AreaOfRealEstateProperty" xlink:label="us-gaap_AreaOfRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_AreaOfRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfOperatingReturnOnCapital" xlink:label="cli_PercentageOfOperatingReturnOnCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfOperatingReturnOnCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PartnersCapital" xlink:label="us-gaap_PartnersCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_PartnersCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AccumulatedUnpaidOperatingReturn" xlink:label="cli_AccumulatedUnpaidOperatingReturn" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_AccumulatedUnpaidOperatingReturn" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ManagementLeasingAndOtherServicesFees" xlink:label="cli_ManagementLeasingAndOtherServicesFees" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ManagementLeasingAndOtherServicesFees" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HoldingAndDistributionPatternUnderOperatingAgreement" xlink:label="cli_HoldingAndDistributionPatternUnderOperatingAgreement" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_HoldingAndDistributionPatternUnderOperatingAgreement" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesBnesAssociatesIiiNarrativeDetails" xlink:type="extended" xlink:title="40422 - Disclosure - Investments In Unconsolidated Joint Ventures (BNES Associates III) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_BNESAssociatesIIIMember" xlink:label="cli_BNESAssociatesIIIMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_BNESAssociatesIIIMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" xlink:label="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" xlink:label="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" xlink:to="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_BNESAssociatesIIIsInterestInOfficesAtCrystalLakeMember" xlink:label="cli_BNESAssociatesIIIsInterestInOfficesAtCrystalLakeMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" xlink:to="cli_BNESAssociatesIIIsInterestInOfficesAtCrystalLakeMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="dei_LegalEntityAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_OfficesAtCrystalLakeLLCMember" xlink:label="cli_OfficesAtCrystalLakeLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="dei_EntityDomain" xlink:to="cli_OfficesAtCrystalLakeLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_IndirectResidualOwnershipPercentage" xlink:label="cli_IndirectResidualOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_IndirectResidualOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AreaOfRealEstateProperty" xlink:label="us-gaap_AreaOfRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_AreaOfRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="us-gaap_EquityMethodInvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_EquityMethodInvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentOwnershipPercentage" xlink:label="cli_InvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_InvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" xlink:label="us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentInterestRateStatedPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MortgageLoanMaturityDate" xlink:label="cli_MortgageLoanMaturityDate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_MortgageLoanMaturityDate" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesPortsideMasterCompanyLLCNarrativeDetails" xlink:type="extended" xlink:title="40423 - Disclosure - Investments In Unconsolidated Joint Ventures (Portside Master Company, L.L.C.) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PortsideMasterCompanyLLCMember" xlink:label="cli_PortsideMasterCompanyLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_PortsideMasterCompanyLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="us-gaap_RangeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_RangeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="us-gaap_RangeMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RangeAxis" xlink:to="us-gaap_RangeMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinimumMember" xlink:label="us-gaap_MinimumMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RangeMember" xlink:to="us-gaap_MinimumMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PortsideAtPierOneBuildingSevenPropertyMember" xlink:label="cli_PortsideAtPierOneBuildingSevenPropertyMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:to="cli_PortsideAtPierOneBuildingSevenPropertyMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermDebtTypeAxis" xlink:label="us-gaap_ShortTermDebtTypeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ShortTermDebtTypeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="us-gaap_ShortTermDebtTypeDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ShortTermDebtTypeAxis" xlink:to="us-gaap_ShortTermDebtTypeDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ConstructionLoanMember" xlink:label="cli_ConstructionLoanMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_ShortTermDebtTypeDomain" xlink:to="cli_ConstructionLoanMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ConstructionLoanExtensionNumberOneMember" xlink:label="cli_ConstructionLoanExtensionNumberOneMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ShortTermDebtTypeDomain" xlink:to="cli_ConstructionLoanExtensionNumberOneMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ConstructionLoanExtensionNumberTwoMember" xlink:label="cli_ConstructionLoanExtensionNumberTwoMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ShortTermDebtTypeDomain" xlink:to="cli_ConstructionLoanExtensionNumberTwoMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" xlink:label="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" xlink:label="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" xlink:to="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" priority="1" use="optional" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" xlink:to="cli_PortsideMasterCompanyLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PortsideMasterCompanysInterestInPortsideApartmentHoldingsMember" xlink:label="cli_PortsideMasterCompanysInterestInPortsideApartmentHoldingsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" xlink:to="cli_PortsideMasterCompanysInterestInPortsideApartmentHoldingsMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="dei_LegalEntityAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PRIIPortsideInvestorsLLCMember" xlink:label="cli_PRIIPortsideInvestorsLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="dei_EntityDomain" xlink:to="cli_PRIIPortsideInvestorsLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PortsideApartmentHoldingsLLCMember" xlink:label="cli_PortsideApartmentHoldingsLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="dei_EntityDomain" xlink:to="cli_PortsideApartmentHoldingsLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_IndirectResidualOwnershipPercentage" xlink:label="cli_IndirectResidualOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_IndirectResidualOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfUnitsInRealEstateProperty" xlink:label="us-gaap_NumberOfUnitsInRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_NumberOfUnitsInRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentOwnershipPercentage" xlink:label="cli_InvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_InvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_EstimatedCostOfProject" xlink:label="cli_EstimatedCostOfProject" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_EstimatedCostOfProject" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityAmountOutstanding" xlink:label="us-gaap_LineOfCreditFacilityAmountOutstanding" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_LineOfCreditFacilityAmountOutstanding" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfOperatingReturnOnCapital" xlink:label="cli_PercentageOfOperatingReturnOnCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfOperatingReturnOnCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PartnersCapital" xlink:label="us-gaap_PartnersCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_PartnersCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AccumulatedUnpaidOperatingReturn" xlink:label="cli_AccumulatedUnpaidOperatingReturn" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_AccumulatedUnpaidOperatingReturn" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfCapitalEventCashFlowsDistributed" xlink:label="cli_PercentageOfCapitalEventCashFlowsDistributed" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfCapitalEventCashFlowsDistributed" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InternalRateOfReturn" xlink:label="cli_InternalRateOfReturn" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_InternalRateOfReturn" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="us-gaap_DebtInstrumentMaturityDate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentMaturityDate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtInstrumentNumberOfExtensionOptions" xlink:label="cli_DebtInstrumentNumberOfExtensionOptions" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="15" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DebtInstrumentNumberOfExtensionOptions" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtInstrumentExtensionPeriod" xlink:label="cli_DebtInstrumentExtensionPeriod" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="16" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DebtInstrumentExtensionPeriod" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtInstrumentExtensionFeePercentage" xlink:label="cli_DebtInstrumentExtensionFeePercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="17" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DebtInstrumentExtensionFeePercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfDebtGuaranteedByCompany" xlink:label="cli_PercentageOfDebtGuaranteedByCompany" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="18" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfDebtGuaranteedByCompany" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfDebtGuaranteedByCompanyAfterProjectCompletion" xlink:label="cli_PercentageOfDebtGuaranteedByCompanyAfterProjectCompletion" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="19" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfDebtGuaranteedByCompanyAfterProjectCompletion" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfDebtGuaranteedByCompanyAfterDebtServiceCoverageRatioThresholdReached" xlink:label="cli_PercentageOfDebtGuaranteedByCompanyAfterDebtServiceCoverageRatioThresholdReached" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="20" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfDebtGuaranteedByCompanyAfterDebtServiceCoverageRatioThresholdReached" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ThresholdOfPaymentGuaranteeTerminationDebtServiceCoverageRatio" xlink:label="cli_ThresholdOfPaymentGuaranteeTerminationDebtServiceCoverageRatio" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="21" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ThresholdOfPaymentGuaranteeTerminationDebtServiceCoverageRatio" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DevelopmentManagementAndOtherServicesFees" xlink:label="cli_DevelopmentManagementAndOtherServicesFees" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="22" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DevelopmentManagementAndOtherServicesFees" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HoldingAndDistributionPatternUnderOperatingAgreement" xlink:label="cli_HoldingAndDistributionPatternUnderOperatingAgreement" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="23" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_HoldingAndDistributionPatternUnderOperatingAgreement" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesPrurosePortImperialSouth13LlcNarrativeDetails" xlink:type="extended" xlink:title="40424 - Disclosure - Investments In Unconsolidated Joint Ventures (PruRose Port Imperial South 13, LLC) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="us-gaap_StatementScenarioAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_StatementScenarioAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="us-gaap_ScenarioUnspecifiedDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_StatementScenarioAxis" xlink:to="us-gaap_ScenarioUnspecifiedDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioForecastMember" xlink:label="us-gaap_ScenarioForecastMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_ScenarioUnspecifiedDomain" xlink:to="us-gaap_ScenarioForecastMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="us-gaap_RangeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_RangeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="us-gaap_RangeMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RangeAxis" xlink:to="us-gaap_RangeMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinimumMember" xlink:label="us-gaap_MinimumMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RangeMember" xlink:to="us-gaap_MinimumMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MaximumMember" xlink:label="us-gaap_MaximumMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_RangeMember" xlink:to="us-gaap_MaximumMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtServiceCoverageRatioAxis" xlink:label="cli_DebtServiceCoverageRatioAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="cli_DebtServiceCoverageRatioAxis" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtServiceCoverageRatioDomain" xlink:label="cli_DebtServiceCoverageRatioDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="cli_DebtServiceCoverageRatioAxis" xlink:to="cli_DebtServiceCoverageRatioDomain" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtServiceCoverageRatioDomain" xlink:label="cli_DebtServiceCoverageRatioDomain_635181354721459745" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="cli_DebtServiceCoverageRatioAxis" xlink:to="cli_DebtServiceCoverageRatioDomain_635181354721459745" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtServiceCoverageRatioOneMember" xlink:label="cli_DebtServiceCoverageRatioOneMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="cli_DebtServiceCoverageRatioDomain" xlink:to="cli_DebtServiceCoverageRatioOneMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtServiceCoverageRatioTwoMember" xlink:label="cli_DebtServiceCoverageRatioTwoMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="cli_DebtServiceCoverageRatioDomain" xlink:to="cli_DebtServiceCoverageRatioTwoMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_PropertyPlantAndEquipmentByTypeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="us-gaap_PropertyPlantAndEquipmentTypeDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:to="us-gaap_PropertyPlantAndEquipmentTypeDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LandMember" xlink:label="us-gaap_LandMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="us-gaap_LandMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermDebtTypeAxis" xlink:label="us-gaap_ShortTermDebtTypeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ShortTermDebtTypeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="us-gaap_ShortTermDebtTypeDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ShortTermDebtTypeAxis" xlink:to="us-gaap_ShortTermDebtTypeDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ConstructionLoanMember" xlink:label="cli_ConstructionLoanMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_ShortTermDebtTypeDomain" xlink:to="cli_ConstructionLoanMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ConstructionLoanExtensionNumberOneMember" xlink:label="cli_ConstructionLoanExtensionNumberOneMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ShortTermDebtTypeDomain" xlink:to="cli_ConstructionLoanExtensionNumberOneMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ConstructionLoanExtensionNumberTwoMember" xlink:label="cli_ConstructionLoanExtensionNumberTwoMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ShortTermDebtTypeDomain" xlink:to="cli_ConstructionLoanExtensionNumberTwoMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PortImperialThirteenMember" xlink:label="cli_PortImperialThirteenMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:to="cli_PortImperialThirteenMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="7" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PruRosePortImperialSouthThirteenLLCMember" xlink:label="cli_PruRosePortImperialSouthThirteenLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_PruRosePortImperialSouthThirteenLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="8" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="dei_LegalEntityAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PRIIPortImperialSouthThirteenInvestorLLCMember" xlink:label="cli_PRIIPortImperialSouthThirteenInvestorLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="dei_EntityDomain" xlink:to="cli_PRIIPortImperialSouthThirteenInvestorLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ParentCompanyMember" xlink:label="us-gaap_ParentCompanyMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="dei_EntityDomain" xlink:to="us-gaap_ParentCompanyMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="us-gaap_EquityMethodInvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_EquityMethodInvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfUnitsInRealEstateProperty" xlink:label="us-gaap_NumberOfUnitsInRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_NumberOfUnitsInRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_EstimatedCostOfProject" xlink:label="cli_EstimatedCostOfProject" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_EstimatedCostOfProject" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LimitedPartnersContributedCapital" xlink:label="us-gaap_LimitedPartnersContributedCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_LimitedPartnersContributedCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityAmountOutstanding" xlink:label="us-gaap_LineOfCreditFacilityAmountOutstanding" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_LineOfCreditFacilityAmountOutstanding" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfOperatingReturnOnCapital" xlink:label="cli_PercentageOfOperatingReturnOnCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfOperatingReturnOnCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PartnersCapital" xlink:label="us-gaap_PartnersCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_PartnersCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AccumulatedUnpaidOperatingReturn" xlink:label="cli_AccumulatedUnpaidOperatingReturn" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_AccumulatedUnpaidOperatingReturn" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentOfDistributionsPaidToThirdPartyAfterThresholdReached" xlink:label="cli_PercentOfDistributionsPaidToThirdPartyAfterThresholdReached" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentOfDistributionsPaidToThirdPartyAfterThresholdReached" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ThresholdOfInternalRateOfReturnForDistributionsToThirdParty" xlink:label="cli_ThresholdOfInternalRateOfReturnForDistributionsToThirdParty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ThresholdOfInternalRateOfReturnForDistributionsToThirdParty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="us-gaap_DebtInstrumentMaturityDate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentMaturityDate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtInstrumentExtensionPeriod" xlink:label="cli_DebtInstrumentExtensionPeriod" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="15" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DebtInstrumentExtensionPeriod" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtInstrumentExtensionFeePercentage" xlink:label="cli_DebtInstrumentExtensionFeePercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="16" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DebtInstrumentExtensionFeePercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AmountOfDebtGuaranteedByCompany" xlink:label="cli_AmountOfDebtGuaranteedByCompany" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="17" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_AmountOfDebtGuaranteedByCompany" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AmountOfDebtGuaranteedByCompanyAfterDebtServiceCoverageRatioThresholdReached" xlink:label="cli_AmountOfDebtGuaranteedByCompanyAfterDebtServiceCoverageRatioThresholdReached" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="18" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_AmountOfDebtGuaranteedByCompanyAfterDebtServiceCoverageRatioThresholdReached" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ThresholdOfPaymentGuaranteeReductionDebtServiceCoverageRatio" xlink:label="cli_ThresholdOfPaymentGuaranteeReductionDebtServiceCoverageRatio" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="19" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ThresholdOfPaymentGuaranteeReductionDebtServiceCoverageRatio" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ThresholdOfPaymentGuaranteeTerminationDebtServiceCoverageRatio" xlink:label="cli_ThresholdOfPaymentGuaranteeTerminationDebtServiceCoverageRatio" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="20" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ThresholdOfPaymentGuaranteeTerminationDebtServiceCoverageRatio" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfLoanThatHasFixedInterestRate" xlink:label="cli_PercentageOfLoanThatHasFixedInterestRate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="21" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfLoanThatHasFixedInterestRate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="22" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentInterestRateStatedPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DevelopmentManagementAndOtherServicesFees" xlink:label="cli_DevelopmentManagementAndOtherServicesFees" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="23" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DevelopmentManagementAndOtherServicesFees" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HoldingAndDistributionPatternUnderOperatingAgreement" xlink:label="cli_HoldingAndDistributionPatternUnderOperatingAgreement" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="24" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_HoldingAndDistributionPatternUnderOperatingAgreement" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesRoselandPortImperialPartnersLPNarrativeDetails" xlink:type="extended" xlink:title="40425 - Disclosure - Investments In Unconsolidated Joint Ventures (Roseland/Port Imperial Partners, L.P.) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ParcelCMember" xlink:label="cli_ParcelCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:to="cli_ParcelCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RoselandPortImperialPartnersLPMember" xlink:label="cli_RoselandPortImperialPartnersLPMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_RoselandPortImperialPartnersLPMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_PropertyPlantAndEquipmentByTypeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="us-gaap_PropertyPlantAndEquipmentTypeDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:to="us-gaap_PropertyPlantAndEquipmentTypeDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LandMember" xlink:label="us-gaap_LandMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="us-gaap_LandMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="dei_LegalEntityAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PrudentialMember" xlink:label="cli_PrudentialMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="dei_EntityDomain" xlink:to="cli_PrudentialMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PrudentialPortImperialLLCMember" xlink:label="cli_PrudentialPortImperialLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="dei_EntityDomain" xlink:to="cli_PrudentialPortImperialLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PrudentialAndPrudentialPortImperialLLCMember" xlink:label="cli_PrudentialAndPrudentialPortImperialLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="dei_EntityDomain" xlink:to="cli_PrudentialAndPrudentialPortImperialLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ParentCompanyMember" xlink:label="us-gaap_ParentCompanyMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="dei_EntityDomain" xlink:to="us-gaap_ParentCompanyMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ResidualOwnershipInterest" xlink:label="cli_ResidualOwnershipInterest" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ResidualOwnershipInterest" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfUnitsInRealEstateProperty" xlink:label="us-gaap_NumberOfUnitsInRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_NumberOfUnitsInRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ThirdPartyOwnershipPercent" xlink:label="cli_ThirdPartyOwnershipPercent" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ThirdPartyOwnershipPercent" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfOperatingReturnOnCapital" xlink:label="cli_PercentageOfOperatingReturnOnCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfOperatingReturnOnCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfReturnOnAdditionalCapitalContributions" xlink:label="cli_PercentageOfReturnOnAdditionalCapitalContributions" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfReturnOnAdditionalCapitalContributions" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AccumulatedUnpaidOperatingReturn" xlink:label="cli_AccumulatedUnpaidOperatingReturn" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_AccumulatedUnpaidOperatingReturn" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PartnersCapital" xlink:label="us-gaap_PartnersCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_PartnersCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HoldingAndDistributionPatternUnderOperatingAgreement" xlink:label="cli_HoldingAndDistributionPatternUnderOperatingAgreement" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_HoldingAndDistributionPatternUnderOperatingAgreement" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesRosegardenMarbellaSouthLLCNarrativeDetails" xlink:type="extended" xlink:title="40426 - Disclosure - Investments In Unconsolidated Joint Ventures (RoseGarden Marbella South, L.L.C.) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermDebtTypeAxis" xlink:label="us-gaap_ShortTermDebtTypeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ShortTermDebtTypeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="us-gaap_ShortTermDebtTypeDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ShortTermDebtTypeAxis" xlink:to="us-gaap_ShortTermDebtTypeDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ConstructionLoanMember" xlink:label="cli_ConstructionLoanMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_ShortTermDebtTypeDomain" xlink:to="cli_ConstructionLoanMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ConstructionLoanExtensionNumberOneMember" xlink:label="cli_ConstructionLoanExtensionNumberOneMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ShortTermDebtTypeDomain" xlink:to="cli_ConstructionLoanExtensionNumberOneMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ConstructionLoanExtensionNumberTwoMember" xlink:label="cli_ConstructionLoanExtensionNumberTwoMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ShortTermDebtTypeDomain" xlink:to="cli_ConstructionLoanExtensionNumberTwoMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MarbellaIIProjectMember" xlink:label="cli_MarbellaIIProjectMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:to="cli_MarbellaIIProjectMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" xlink:label="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" xlink:label="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" xlink:to="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RoseGardenMarbellaSouthsInterestInPruRoseMarbellaIIMember" xlink:label="cli_RoseGardenMarbellaSouthsInterestInPruRoseMarbellaIIMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" xlink:to="cli_RoseGardenMarbellaSouthsInterestInPruRoseMarbellaIIMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RoseGardenMarbellaSouthLLCMember" xlink:label="cli_RoseGardenMarbellaSouthLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_RoseGardenMarbellaSouthLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="dei_LegalEntityAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PruRoseMarbellaIILLCMember" xlink:label="cli_PruRoseMarbellaIILLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="dei_EntityDomain" xlink:to="cli_PruRoseMarbellaIILLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PrisaIIIInvestmentsLLCMember" xlink:label="cli_PrisaIIIInvestmentsLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="dei_EntityDomain" xlink:to="cli_PrisaIIIInvestmentsLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ParentCompanyMember" xlink:label="us-gaap_ParentCompanyMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="dei_EntityDomain" xlink:to="us-gaap_ParentCompanyMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_IndirectResidualOwnershipPercentage" xlink:label="cli_IndirectResidualOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_IndirectResidualOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfUnitsInRealEstateProperty" xlink:label="us-gaap_NumberOfUnitsInRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_NumberOfUnitsInRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="us-gaap_EquityMethodInvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_EquityMethodInvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentOwnershipPercentage" xlink:label="cli_InvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_InvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_EstimatedCostOfProject" xlink:label="cli_EstimatedCostOfProject" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_EstimatedCostOfProject" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_EstimatedProjectCostsToBeFundedByMemberCapital" xlink:label="cli_EstimatedProjectCostsToBeFundedByMemberCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_EstimatedProjectCostsToBeFundedByMemberCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfOperatingReturnOnCapital" xlink:label="cli_PercentageOfOperatingReturnOnCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfOperatingReturnOnCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PartnersCapital" xlink:label="us-gaap_PartnersCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_PartnersCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AccumulatedUnpaidOperatingReturn" xlink:label="cli_AccumulatedUnpaidOperatingReturn" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_AccumulatedUnpaidOperatingReturn" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtInstrumentNumberOfExtensionOptions" xlink:label="cli_DebtInstrumentNumberOfExtensionOptions" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DebtInstrumentNumberOfExtensionOptions" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MortgageLoanMaturityDate" xlink:label="cli_MortgageLoanMaturityDate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_MortgageLoanMaturityDate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtInstrumentExtensionPeriod" xlink:label="cli_DebtInstrumentExtensionPeriod" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="15" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DebtInstrumentExtensionPeriod" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtInstrumentExtensionFeePercentage" xlink:label="cli_DebtInstrumentExtensionFeePercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="16" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DebtInstrumentExtensionFeePercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DevelopmentManagementAndOtherServicesFees" xlink:label="cli_DevelopmentManagementAndOtherServicesFees" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="17" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DevelopmentManagementAndOtherServicesFees" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HoldingAndDistributionPatternUnderOperatingAgreement" xlink:label="cli_HoldingAndDistributionPatternUnderOperatingAgreement" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="18" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_HoldingAndDistributionPatternUnderOperatingAgreement" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesPruroseRiverwalkGLLCNarrativeDetails" xlink:type="extended" xlink:title="40427 - Disclosure - Investments In Unconsolidated Joint Ventures (PruRose Riverwalk G, L.L.C.) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RiverTraceProjectMember" xlink:label="cli_RiverTraceProjectMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:to="cli_RiverTraceProjectMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermDebtTypeAxis" xlink:label="us-gaap_ShortTermDebtTypeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ShortTermDebtTypeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="us-gaap_ShortTermDebtTypeDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ShortTermDebtTypeAxis" xlink:to="us-gaap_ShortTermDebtTypeDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ConstructionLoanMember" xlink:label="cli_ConstructionLoanMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_ShortTermDebtTypeDomain" xlink:to="cli_ConstructionLoanMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" xlink:label="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" xlink:label="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" xlink:to="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PruRoseRiverwalkGsInterestInRiverwalkGUrbanRenewalMember" xlink:label="cli_PruRoseRiverwalkGsInterestInRiverwalkGUrbanRenewalMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" xlink:to="cli_PruRoseRiverwalkGsInterestInRiverwalkGUrbanRenewalMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PruRoseRiverwalkGLLCMember" xlink:label="cli_PruRoseRiverwalkGLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_PruRoseRiverwalkGLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="dei_LegalEntityAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_WestNewYorkParcelGApartmentsInvestorsLLCMember" xlink:label="cli_WestNewYorkParcelGApartmentsInvestorsLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="dei_EntityDomain" xlink:to="cli_WestNewYorkParcelGApartmentsInvestorsLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RiverwalkGUrbanRenewalLLCMember" xlink:label="cli_RiverwalkGUrbanRenewalLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="dei_EntityDomain" xlink:to="cli_RiverwalkGUrbanRenewalLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PrudentialMember" xlink:label="cli_PrudentialMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="dei_EntityDomain" xlink:to="cli_PrudentialMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_IndirectResidualOwnershipPercentage" xlink:label="cli_IndirectResidualOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_IndirectResidualOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NumberOfStoriesInRealEstateProperty" xlink:label="cli_NumberOfStoriesInRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_NumberOfStoriesInRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfUnitsInRealEstateProperty" xlink:label="us-gaap_NumberOfUnitsInRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_NumberOfUnitsInRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="us-gaap_EquityMethodInvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_EquityMethodInvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestmentOwnershipPercentage" xlink:label="cli_InvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_InvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_EstimatedCostOfProject" xlink:label="cli_EstimatedCostOfProject" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_EstimatedCostOfProject" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfOperatingReturnOnCapital" xlink:label="cli_PercentageOfOperatingReturnOnCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfOperatingReturnOnCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PartnersCapital" xlink:label="us-gaap_PartnersCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_PartnersCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AccumulatedUnpaidOperatingReturn" xlink:label="cli_AccumulatedUnpaidOperatingReturn" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_AccumulatedUnpaidOperatingReturn" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfCapitalEventCashFlowsDistributed" xlink:label="cli_PercentageOfCapitalEventCashFlowsDistributed" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfCapitalEventCashFlowsDistributed" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InternalRateOfReturn" xlink:label="cli_InternalRateOfReturn" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_InternalRateOfReturn" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AmountOfCompanysInitialDistributionsToBeRedirected" xlink:label="cli_AmountOfCompanysInitialDistributionsToBeRedirected" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_AmountOfCompanysInitialDistributionsToBeRedirected" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityAmountOutstanding" xlink:label="us-gaap_LineOfCreditFacilityAmountOutstanding" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="15" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_LineOfCreditFacilityAmountOutstanding" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="16" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentInterestRateStatedPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="us-gaap_DebtInstrumentMaturityDate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="17" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentMaturityDate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PeriodOfLoanGuaranteeByCompanyFollowingCompletionOfProject" xlink:label="cli_PeriodOfLoanGuaranteeByCompanyFollowingCompletionOfProject" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="18" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PeriodOfLoanGuaranteeByCompanyFollowingCompletionOfProject" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DevelopmentManagementAndOtherServicesFees" xlink:label="cli_DevelopmentManagementAndOtherServicesFees" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="19" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DevelopmentManagementAndOtherServicesFees" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HoldingAndDistributionPatternUnderOperatingAgreement" xlink:label="cli_HoldingAndDistributionPatternUnderOperatingAgreement" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="20" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_HoldingAndDistributionPatternUnderOperatingAgreement" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesElmajoUrbanRenewalAssociatesLLCEstuaryUrbanRenewalUnitBLlcNarrativeDetails" xlink:type="extended" xlink:title="40428 - Disclosure - Investments In Unconsolidated Joint Ventures (ELMAJO Urban Renewal Associates, L.L.C./Estuary Urban Renewal Unit B, LLC) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermDebtTypeAxis" xlink:label="us-gaap_ShortTermDebtTypeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ShortTermDebtTypeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="us-gaap_ShortTermDebtTypeDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ShortTermDebtTypeAxis" xlink:to="us-gaap_ShortTermDebtTypeDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ConstructionLoanMember" xlink:label="cli_ConstructionLoanMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_ShortTermDebtTypeDomain" xlink:to="cli_ConstructionLoanMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_LincolnHarborProjectBuildingaMember" xlink:label="cli_LincolnHarborProjectBuildingaMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:to="cli_LincolnHarborProjectBuildingaMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_LincolnHarborProjectBuildingCMember" xlink:label="cli_LincolnHarborProjectBuildingCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:to="cli_LincolnHarborProjectBuildingCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_LincolnHarborProjectBuildingBMember" xlink:label="cli_LincolnHarborProjectBuildingBMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:to="cli_LincolnHarborProjectBuildingBMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_LincolnHarborProjectMember" xlink:label="cli_LincolnHarborProjectMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:to="cli_LincolnHarborProjectMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_LincolnHarborProjectBuildingsAandCMember" xlink:label="cli_LincolnHarborProjectBuildingsAandCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:to="cli_LincolnHarborProjectBuildingsAandCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ElmajoUrbanRenewalAssociatesLLCMember" xlink:label="cli_ElmajoUrbanRenewalAssociatesLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_ElmajoUrbanRenewalAssociatesLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ElmajoUrbanRenewalAssociatesLLCAndEstuaryUrbanRenewalAssociatesLLCMember" xlink:label="cli_ElmajoUrbanRenewalAssociatesLLCAndEstuaryUrbanRenewalAssociatesLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_ElmajoUrbanRenewalAssociatesLLCAndEstuaryUrbanRenewalAssociatesLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="dei_LegalEntityAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ElmajoManagementIncMember" xlink:label="cli_ElmajoManagementIncMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="dei_EntityDomain" xlink:to="cli_ElmajoManagementIncMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ElmajoManagementIncAndEstuaryUrbanRenewalUnitBLLCMember" xlink:label="cli_ElmajoManagementIncAndEstuaryUrbanRenewalUnitBLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="dei_EntityDomain" xlink:to="cli_ElmajoManagementIncAndEstuaryUrbanRenewalUnitBLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_EstuaryUrbanRenewalUnitBLLCMember" xlink:label="cli_EstuaryUrbanRenewalUnitBLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="dei_EntityDomain" xlink:to="cli_EstuaryUrbanRenewalUnitBLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ResidualOwnershipInterest" xlink:label="cli_ResidualOwnershipInterest" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ResidualOwnershipInterest" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfRealEstateProperties" xlink:label="us-gaap_NumberOfRealEstateProperties" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_NumberOfRealEstateProperties" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfUnitsInRealEstateProperty" xlink:label="us-gaap_NumberOfUnitsInRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_NumberOfUnitsInRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_EstimatedCostOfProject" xlink:label="cli_EstimatedCostOfProject" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_EstimatedCostOfProject" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageReturnOnUnrecoveredCapital" xlink:label="cli_PercentageReturnOnUnrecoveredCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageReturnOnUnrecoveredCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PartnersCapital" xlink:label="us-gaap_PartnersCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_PartnersCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AccumulatedUnpaidOperatingReturn" xlink:label="cli_AccumulatedUnpaidOperatingReturn" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_AccumulatedUnpaidOperatingReturn" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityAmountOutstanding" xlink:label="us-gaap_LineOfCreditFacilityAmountOutstanding" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_LineOfCreditFacilityAmountOutstanding" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="us-gaap_DebtInstrumentMaturityDate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentMaturityDate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtInstrumentExtensionPeriod" xlink:label="cli_DebtInstrumentExtensionPeriod" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DebtInstrumentExtensionPeriod" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtInstrumentExtensionFeePercentage" xlink:label="cli_DebtInstrumentExtensionFeePercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DebtInstrumentExtensionFeePercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DevelopmentManagementAndOtherServicesFees" xlink:label="cli_DevelopmentManagementAndOtherServicesFees" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="15" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DevelopmentManagementAndOtherServicesFees" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ProjectCostsRequiredFundingAmount" xlink:label="cli_ProjectCostsRequiredFundingAmount" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="16" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ProjectCostsRequiredFundingAmount" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HoldingAndDistributionPatternUnderOperatingAgreement" xlink:label="cli_HoldingAndDistributionPatternUnderOperatingAgreement" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="17" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_HoldingAndDistributionPatternUnderOperatingAgreement" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesRiverparkAtHarrisonILLCNarrativeDetails" xlink:type="extended" xlink:title="40429 - Disclosure - Investments In Unconsolidated Joint Ventures (RiverPark At Harrison I, L.L.C.) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermDebtTypeAxis" xlink:label="us-gaap_ShortTermDebtTypeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ShortTermDebtTypeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="us-gaap_ShortTermDebtTypeDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ShortTermDebtTypeAxis" xlink:to="us-gaap_ShortTermDebtTypeDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ConstructionLoanMember" xlink:label="cli_ConstructionLoanMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_ShortTermDebtTypeDomain" xlink:to="cli_ConstructionLoanMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ConstructionLoanExtensionNumberOneMember" xlink:label="cli_ConstructionLoanExtensionNumberOneMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ShortTermDebtTypeDomain" xlink:to="cli_ConstructionLoanExtensionNumberOneMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ConstructionLoanExtensionNumberTwoMember" xlink:label="cli_ConstructionLoanExtensionNumberTwoMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ShortTermDebtTypeDomain" xlink:to="cli_ConstructionLoanExtensionNumberTwoMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RiverparkProjectMember" xlink:label="cli_RiverparkProjectMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:to="cli_RiverparkProjectMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RiverparkAtHarrisonILLCMember" xlink:label="cli_RiverparkAtHarrisonILLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_RiverparkAtHarrisonILLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="dei_LegalEntityAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ChallEnterprisesLLCMember" xlink:label="cli_ChallEnterprisesLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="dei_EntityDomain" xlink:to="cli_ChallEnterprisesLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InvestorGroupMember" xlink:label="cli_InvestorGroupMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="dei_EntityDomain" xlink:to="cli_InvestorGroupMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="us-gaap_EquityMethodInvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_EquityMethodInvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfUnitsInRealEstateProperty" xlink:label="us-gaap_NumberOfUnitsInRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_NumberOfUnitsInRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_EstimatedCostOfProject" xlink:label="cli_EstimatedCostOfProject" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_EstimatedCostOfProject" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfCapitalRequiredToFundProject" xlink:label="cli_PercentageOfCapitalRequiredToFundProject" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfCapitalRequiredToFundProject" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ThirdPartyOwnershipPercent" xlink:label="cli_ThirdPartyOwnershipPercent" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ThirdPartyOwnershipPercent" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityAmountOutstanding" xlink:label="us-gaap_LineOfCreditFacilityAmountOutstanding" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_LineOfCreditFacilityAmountOutstanding" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="us-gaap_DebtInstrumentMaturityDate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentMaturityDate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtInstrumentNumberOfExtensionOptions" xlink:label="cli_DebtInstrumentNumberOfExtensionOptions" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DebtInstrumentNumberOfExtensionOptions" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtInstrumentExtensionPeriod" xlink:label="cli_DebtInstrumentExtensionPeriod" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DebtInstrumentExtensionPeriod" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtInstrumentExtensionFeePercentage" xlink:label="cli_DebtInstrumentExtensionFeePercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DebtInstrumentExtensionFeePercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfDebtGuaranteedByCompany" xlink:label="cli_PercentageOfDebtGuaranteedByCompany" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfDebtGuaranteedByCompany" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfDebtGuaranteedByCompanyAfterProjectCompletionAndAchievementOfFinancialRatios" xlink:label="cli_PercentageOfDebtGuaranteedByCompanyAfterProjectCompletionAndAchievementOfFinancialRatios" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="15" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfDebtGuaranteedByCompanyAfterProjectCompletionAndAchievementOfFinancialRatios" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ThresholdOfPaymentGuaranteeDebtServiceCoverageRatio" xlink:label="cli_ThresholdOfPaymentGuaranteeDebtServiceCoverageRatio" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="16" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ThresholdOfPaymentGuaranteeDebtServiceCoverageRatio" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ThresholdOfPaymentGuaranteeLoanToValueRatio" xlink:label="cli_ThresholdOfPaymentGuaranteeLoanToValueRatio" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="17" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ThresholdOfPaymentGuaranteeLoanToValueRatio" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HoldingAndDistributionPatternUnderOperatingAgreement" xlink:label="cli_HoldingAndDistributionPatternUnderOperatingAgreement" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="18" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_HoldingAndDistributionPatternUnderOperatingAgreement" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVentures150MainStreetLLCNarrativeDetails" xlink:type="extended" xlink:title="40430 - Disclosure - Investments In Unconsolidated Joint Ventures (150 Main Street, L.L.C.) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermDebtTypeAxis" xlink:label="us-gaap_ShortTermDebtTypeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ShortTermDebtTypeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="us-gaap_ShortTermDebtTypeDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ShortTermDebtTypeAxis" xlink:to="us-gaap_ShortTermDebtTypeDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ConstructionLoanMember" xlink:label="cli_ConstructionLoanMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_ShortTermDebtTypeDomain" xlink:to="cli_ConstructionLoanMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_EastchesterProjectMember" xlink:label="cli_EastchesterProjectMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:to="cli_EastchesterProjectMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_OneHundredFiftyMainStreetLLCMember" xlink:label="cli_OneHundredFiftyMainStreetLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_OneHundredFiftyMainStreetLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="dei_LegalEntityAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_JMPEastchesterLLCMember" xlink:label="cli_JMPEastchesterLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="dei_EntityDomain" xlink:to="cli_JMPEastchesterLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HudsonValleyLandHoldingsLLCMember" xlink:label="cli_HudsonValleyLandHoldingsLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="dei_EntityDomain" xlink:to="cli_HudsonValleyLandHoldingsLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="us-gaap_EquityMethodInvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_EquityMethodInvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfUnitsInRealEstateProperty" xlink:label="us-gaap_NumberOfUnitsInRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_NumberOfUnitsInRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross" xlink:label="us-gaap_PaymentsToAcquireBusinessesGross" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_PaymentsToAcquireBusinessesGross" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ThirdPartyOwnershipPercent" xlink:label="cli_ThirdPartyOwnershipPercent" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ThirdPartyOwnershipPercent" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_EstimatedCostOfProject" xlink:label="cli_EstimatedCostOfProject" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_EstimatedCostOfProject" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AmountOfProjectCostsFundedByMembers" xlink:label="cli_AmountOfProjectCostsFundedByMembers" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_AmountOfProjectCostsFundedByMembers" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PreferredRateOfReturn" xlink:label="cli_PreferredRateOfReturn" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PreferredRateOfReturn" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageReturnOnUnrecoveredCapital" xlink:label="cli_PercentageReturnOnUnrecoveredCapital" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageReturnOnUnrecoveredCapital" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DevelopmentManagementAndOtherServicesFees" xlink:label="cli_DevelopmentManagementAndOtherServicesFees" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_DevelopmentManagementAndOtherServicesFees" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HoldingAndDistributionPatternUnderOperatingAgreement" xlink:label="cli_HoldingAndDistributionPatternUnderOperatingAgreement" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_HoldingAndDistributionPatternUnderOperatingAgreement" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesRosegardenMonacoLLCNarrativeDetails" xlink:type="extended" xlink:title="40431 - Disclosure - Investments In Unconsolidated Joint Ventures (RoseGarden Monaco, L.L.C.) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RoseGardenMonacoLLCMember" xlink:label="cli_RoseGardenMonacoLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_RoseGardenMonacoLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="us-gaap_EquityMethodInvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_EquityMethodInvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HoldingAndDistributionPatternUnderOperatingAgreement" xlink:label="cli_HoldingAndDistributionPatternUnderOperatingAgreement" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_HoldingAndDistributionPatternUnderOperatingAgreement" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesHillsborough206HoldingsLLCNarrativeDetails" xlink:type="extended" xlink:title="40432 - Disclosure - Investments In Unconsolidated Joint Ventures (Hillsborough 206 Holdings, L.L.C.) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HillsboroughTwoHundredSixHoldingsLLCMember" xlink:label="cli_HillsboroughTwoHundredSixHoldingsLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_HillsboroughTwoHundredSixHoldingsLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="us-gaap_EquityMethodInvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_EquityMethodInvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HoldingAndDistributionPatternUnderOperatingAgreement" xlink:label="cli_HoldingAndDistributionPatternUnderOperatingAgreement" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_HoldingAndDistributionPatternUnderOperatingAgreement" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesGrandJerseyWaterfrontUrbanRenewalAssociatesLLCNarrativeDetails" xlink:type="extended" xlink:title="40433 - Disclosure - Investments In Unconsolidated Joint Ventures (Grand Jersey Waterfront Urban Renewal Associates, L.L.C.) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_GrandJerseyWaterfrontUrbanRenewalAssociatesLLCMember" xlink:label="cli_GrandJerseyWaterfrontUrbanRenewalAssociatesLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_GrandJerseyWaterfrontUrbanRenewalAssociatesLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="us-gaap_EquityMethodInvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_EquityMethodInvestmentOwnershipPercentage" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureInvestmentsInUnconsolidatedJointVenturesCrystalHouseApartmentsInvestorsLlcNarrativeDetails" xlink:type="extended" xlink:title="40434 - Disclosure - Investments In Unconsolidated Joint Ventures (Crystal House Apartments Investors LLC) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_CrystalHouseApartmentsInvestorsLLCMember" xlink:label="cli_CrystalHouseApartmentsInvestorsLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_CrystalHouseApartmentsInvestorsLLCMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:to="dei_LegalEntityAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ParentCompanyMember" xlink:label="us-gaap_ParentCompanyMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="dei_EntityDomain" xlink:to="us-gaap_ParentCompanyMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_UBSGlobalAssetManagementMember" xlink:label="cli_UBSGlobalAssetManagementMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="dei_EntityDomain" xlink:to="cli_UBSGlobalAssetManagementMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfUnitsInRealEstateProperty" xlink:label="us-gaap_NumberOfUnitsInRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_NumberOfUnitsInRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_VenturePropertyAcquisitionCost" xlink:label="cli_VenturePropertyAcquisitionCost" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_VenturePropertyAcquisitionCost" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NumberOfUnitsAvailableForDevelopment" xlink:label="cli_NumberOfUnitsAvailableForDevelopment" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_NumberOfUnitsAvailableForDevelopment" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NumberOfApprovedUnitsAvailableForDevelopment" xlink:label="cli_NumberOfApprovedUnitsAvailableForDevelopment" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_NumberOfApprovedUnitsAvailableForDevelopment" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="us-gaap_EquityMethodInvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_EquityMethodInvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InternalRateOfReturn" xlink:label="cli_InternalRateOfReturn" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_InternalRateOfReturn" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfCapitalEventCashFlowsDistributed" xlink:label="cli_PercentageOfCapitalEventCashFlowsDistributed" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfCapitalEventCashFlowsDistributed" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" xlink:label="us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentInterestRateStatedPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MortgageLoanMaturityDate" xlink:label="cli_MortgageLoanMaturityDate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_MortgageLoanMaturityDate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MortgageLoanInitialTermOfInterestOnlyPayments" xlink:label="cli_MortgageLoanInitialTermOfInterestOnlyPayments" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_MortgageLoanInitialTermOfInterestOnlyPayments" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MortgageLoansAmortizationPeriod" xlink:label="cli_MortgageLoansAmortizationPeriod" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_MortgageLoansAmortizationPeriod" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfInterestInDevelopableLand" xlink:label="cli_PercentageOfInterestInDevelopableLand" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_PercentageOfInterestInDevelopableLand" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ManagementLeasingAndOtherServicesFees" xlink:label="cli_ManagementLeasingAndOtherServicesFees" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="15" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_ManagementLeasingAndOtherServicesFees" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HoldingAndDistributionPatternUnderOperatingAgreement" xlink:label="cli_HoldingAndDistributionPatternUnderOperatingAgreement" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="16" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:to="cli_HoldingAndDistributionPatternUnderOperatingAgreement" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureDiscontinuedOperationsNarrativeDetails" xlink:type="extended" xlink:title="40701 - Disclosure - Discontinued Operations (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable" xlink:label="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis" xlink:label="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable" xlink:to="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:label="us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis" xlink:to="us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/stpr/2011/stpr-2011-01-31.xsd#stpr_NJ" xlink:label="stpr_NJ" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:to="stpr_NJ" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:label="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:to="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NumberOfBuildingsOnPropertiesSold" xlink:label="cli_NumberOfBuildingsOnPropertiesSold" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:to="cli_NumberOfBuildingsOnPropertiesSold" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NumberOfLandParcelsSold" xlink:label="cli_NumberOfLandParcelsSold" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:to="cli_NumberOfLandParcelsSold" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AreaOfRealEstatePropertySold" xlink:label="cli_AreaOfRealEstatePropertySold" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:to="cli_AreaOfRealEstatePropertySold" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment" xlink:label="us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:to="us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureSeniorUnsecuredNotesNarrativeDetails" xlink:type="extended" xlink:title="40801 - Disclosure - Senior Unsecured Notes (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="us-gaap_DebtInstrumentTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="us-gaap_LongtermDebtTypeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_DebtInstrumentTable" xlink:to="us-gaap_LongtermDebtTypeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="us-gaap_LongtermDebtTypeDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_LongtermDebtTypeAxis" xlink:to="us-gaap_LongtermDebtTypeDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="us-gaap_LongtermDebtTypeDomain_635181354722099553" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="us-gaap_LongtermDebtTypeAxis" xlink:to="us-gaap_LongtermDebtTypeDomain_635181354722099553" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ThreePointOneFiveZeroPercentSeniorUnsecuredNotesDueMayFifteenthTwoThousandTwentyThreeMember" xlink:label="cli_ThreePointOneFiveZeroPercentSeniorUnsecuredNotesDueMayFifteenthTwoThousandTwentyThreeMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="cli_ThreePointOneFiveZeroPercentSeniorUnsecuredNotesDueMayFifteenthTwoThousandTwentyThreeMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="us-gaap_DebtInstrumentLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="us-gaap_DebtInstrumentFaceAmount" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentFaceAmount" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentInterestRateStatedPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="us-gaap_DebtInstrumentMaturityDate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentMaturityDate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromIssuanceOfUnsecuredDebt" xlink:label="us-gaap_ProceedsFromIssuanceOfUnsecuredDebt" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_ProceedsFromIssuanceOfUnsecuredDebt" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureSeniorUnsecuredNotesSummaryOfSeniorUnsecuredNotesDetails" xlink:type="extended" xlink:title="40802 - Disclosure - Senior Unsecured Notes (Summary Of Senior Unsecured Notes) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="us-gaap_DebtInstrumentTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="us-gaap_LongtermDebtTypeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_DebtInstrumentTable" xlink:to="us-gaap_LongtermDebtTypeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="us-gaap_LongtermDebtTypeDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_LongtermDebtTypeAxis" xlink:to="us-gaap_LongtermDebtTypeDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_FourPointSixZeroZeroPercentSeniorUnsecuredNotesDueJuneFifteenTwoThousandThirteenMember" xlink:label="cli_FourPointSixZeroZeroPercentSeniorUnsecuredNotesDueJuneFifteenTwoThousandThirteenMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="cli_FourPointSixZeroZeroPercentSeniorUnsecuredNotesDueJuneFifteenTwoThousandThirteenMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_FivePointOneTwoFivePercentSeniorUnsecuredNotesDueFebruaryFifteenTwoThousandFourteenMember" xlink:label="cli_FivePointOneTwoFivePercentSeniorUnsecuredNotesDueFebruaryFifteenTwoThousandFourteenMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="cli_FivePointOneTwoFivePercentSeniorUnsecuredNotesDueFebruaryFifteenTwoThousandFourteenMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_FivePointOneTwoFivePercentSeniorUnsecuredNotesDueJanuaryFifteenTwoThousandFifteenMember" xlink:label="cli_FivePointOneTwoFivePercentSeniorUnsecuredNotesDueJanuaryFifteenTwoThousandFifteenMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="cli_FivePointOneTwoFivePercentSeniorUnsecuredNotesDueJanuaryFifteenTwoThousandFifteenMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_FivePointEightZeroZeroPercentSeniorUnsecuredNotesDueJanuaryFifteenTwoThousandSixteenMember" xlink:label="cli_FivePointEightZeroZeroPercentSeniorUnsecuredNotesDueJanuaryFifteenTwoThousandSixteenMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="cli_FivePointEightZeroZeroPercentSeniorUnsecuredNotesDueJanuaryFifteenTwoThousandSixteenMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_TwoPointFiveZeroZeroPercentSeniorUnsecuredNotesDueDecemberFifteenTwoThousandSeventeenMember" xlink:label="cli_TwoPointFiveZeroZeroPercentSeniorUnsecuredNotesDueDecemberFifteenTwoThousandSeventeenMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="cli_TwoPointFiveZeroZeroPercentSeniorUnsecuredNotesDueDecemberFifteenTwoThousandSeventeenMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_SevenPointSevenFiveZeroPercentSeniorUnsecuredNotesDueAugustFifteenTwoThousandNineteenMember" xlink:label="cli_SevenPointSevenFiveZeroPercentSeniorUnsecuredNotesDueAugustFifteenTwoThousandNineteenMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="cli_SevenPointSevenFiveZeroPercentSeniorUnsecuredNotesDueAugustFifteenTwoThousandNineteenMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_FourPointFiveZeroZeroPercentSeniorUnsecuredNotesDueAprilEighteenTwoThousandTwentyTwoMember" xlink:label="cli_FourPointFiveZeroZeroPercentSeniorUnsecuredNotesDueAprilEighteenTwoThousandTwentyTwoMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="cli_FourPointFiveZeroZeroPercentSeniorUnsecuredNotesDueAprilEighteenTwoThousandTwentyTwoMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ThreePointOneFiveZeroPercentSeniorUnsecuredNotesDueMayFifteenthTwoThousandTwentyThreeMember" xlink:label="cli_ThreePointOneFiveZeroPercentSeniorUnsecuredNotesDueMayFifteenthTwoThousandTwentyThreeMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="cli_ThreePointOneFiveZeroPercentSeniorUnsecuredNotesDueMayFifteenthTwoThousandTwentyThreeMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="us-gaap_DebtInstrumentLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_UnsecuredDebt" xlink:label="us-gaap_UnsecuredDebt" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_UnsecuredDebt" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage" xlink:label="us-gaap_DebtInstrumentInterestRateEffectivePercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentInterestRateEffectivePercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentInterestRateStatedPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="us-gaap_DebtInstrumentMaturityDate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentMaturityDate" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureUnsecuredRevolvingCreditFacilityNarrativeDetails" xlink:type="extended" xlink:title="40901 - Disclosure - Unsecured Revolving Credit Facility (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityTable" xlink:label="us-gaap_LineOfCreditFacilityTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="us-gaap_RangeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_LineOfCreditFacilityTable" xlink:to="us-gaap_RangeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="us-gaap_RangeMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RangeAxis" xlink:to="us-gaap_RangeMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MaximumMember" xlink:label="us-gaap_MaximumMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RangeMember" xlink:to="us-gaap_MaximumMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="us-gaap_DebtInstrumentAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_LineOfCreditFacilityTable" xlink:to="us-gaap_DebtInstrumentAxis" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="us-gaap_DebtInstrumentNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_DebtInstrumentAxis" xlink:to="us-gaap_DebtInstrumentNameDomain" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MoneyMarketLoanMember" xlink:label="cli_MoneyMarketLoanMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="cli_MoneyMarketLoanMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityLineItems" xlink:label="us-gaap_LineOfCreditFacilityLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_LineOfCreditFacilityLineItems" xlink:to="us-gaap_LineOfCreditFacilityTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_LineOfCreditFacilityLendingInstitutionsNumber" xlink:label="cli_LineOfCreditFacilityLendingInstitutionsNumber" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_LineOfCreditFacilityLineItems" xlink:to="cli_LineOfCreditFacilityLendingInstitutionsNumber" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_LineOfCreditFacilityLineItems" xlink:to="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_LineOfCreditFacilityExpandableMaximumBorrowingCapacity" xlink:label="cli_LineOfCreditFacilityExpandableMaximumBorrowingCapacity" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_LineOfCreditFacilityLineItems" xlink:to="cli_LineOfCreditFacilityExpandableMaximumBorrowingCapacity" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityExpirationDate1" xlink:label="us-gaap_LineOfCreditFacilityExpirationDate1" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_LineOfCreditFacilityLineItems" xlink:to="us-gaap_LineOfCreditFacilityExpirationDate1" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DebtInstrumentNumberOfExtensionOptions" xlink:label="cli_DebtInstrumentNumberOfExtensionOptions" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_LineOfCreditFacilityLineItems" xlink:to="cli_DebtInstrumentNumberOfExtensionOptions" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_LineOfCreditFacilityExtensionPeriod" xlink:label="cli_LineOfCreditFacilityExtensionPeriod" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_LineOfCreditFacilityLineItems" xlink:to="cli_LineOfCreditFacilityExtensionPeriod" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_LineOfCreditFacilityBasisPointFacilityFee" xlink:label="cli_LineOfCreditFacilityBasisPointFacilityFee" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_LineOfCreditFacilityLineItems" xlink:to="cli_LineOfCreditFacilityBasisPointFacilityFee" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_LineOfCreditFacilityBidFeatureCurrentBorrowingCapacity" xlink:label="cli_LineOfCreditFacilityBidFeatureCurrentBorrowingCapacity" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_LineOfCreditFacilityLineItems" xlink:to="cli_LineOfCreditFacilityBidFeatureCurrentBorrowingCapacity" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityCovenantTerms" xlink:label="us-gaap_LineOfCreditFacilityCovenantTerms" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_LineOfCreditFacilityLineItems" xlink:to="us-gaap_LineOfCreditFacilityCovenantTerms" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityDividendRestrictions" xlink:label="us-gaap_LineOfCreditFacilityDividendRestrictions" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_LineOfCreditFacilityLineItems" xlink:to="us-gaap_LineOfCreditFacilityDividendRestrictions" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCredit" xlink:label="us-gaap_LineOfCredit" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="us-gaap_LineOfCreditFacilityLineItems" xlink:to="us-gaap_LineOfCredit" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="us-gaap_LineOfCreditFacilityLineItems" xlink:to="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_LineOfCreditFacilityMaturityPeriod" xlink:label="cli_LineOfCreditFacilityMaturityPeriod" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="us-gaap_LineOfCreditFacilityLineItems" xlink:to="cli_LineOfCreditFacilityMaturityPeriod" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureUnsecuredRevolvingCreditFacilityChangeInOperatingPartnershipSUnsecuredDebtRatingsDetails" xlink:type="extended" xlink:title="40902 - Disclosure - Unsecured Revolving Credit Facility (Change In The Operating Partnership's Unsecured Debt Ratings) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityTable" xlink:label="us-gaap_LineOfCreditFacilityTable" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_CreditRatingMoodysAndStandardAndPoorsAxis" xlink:label="cli_CreditRatingMoodysAndStandardAndPoorsAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_LineOfCreditFacilityTable" xlink:to="cli_CreditRatingMoodysAndStandardAndPoorsAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_CreditRatingMoodysAndStandardPoorsDomain" xlink:label="cli_CreditRatingMoodysAndStandardPoorsDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="cli_CreditRatingMoodysAndStandardAndPoorsAxis" xlink:to="cli_CreditRatingMoodysAndStandardPoorsDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_CreditRatingMoodysAndStandardPoorsDomain" xlink:label="cli_CreditRatingMoodysAndStandardPoorsDomain_635181354722159535" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="cli_CreditRatingMoodysAndStandardAndPoorsAxis" xlink:to="cli_CreditRatingMoodysAndStandardPoorsDomain_635181354722159535" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NoRatingsOrLessThanBbbMinusBaaThreeMember" xlink:label="cli_NoRatingsOrLessThanBbbMinusBaaThreeMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="cli_CreditRatingMoodysAndStandardPoorsDomain" xlink:to="cli_NoRatingsOrLessThanBbbMinusBaaThreeMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_BbbMinusOrBaaThreeMember" xlink:label="cli_BbbMinusOrBaaThreeMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="cli_CreditRatingMoodysAndStandardPoorsDomain" xlink:to="cli_BbbMinusOrBaaThreeMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_BbbOrBaaTwoCurrentMember" xlink:label="cli_BbbOrBaaTwoCurrentMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="cli_CreditRatingMoodysAndStandardPoorsDomain" xlink:to="cli_BbbOrBaaTwoCurrentMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_BbbPlusOrBaaOneMember" xlink:label="cli_BbbPlusOrBaaOneMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="cli_CreditRatingMoodysAndStandardPoorsDomain" xlink:to="cli_BbbPlusOrBaaOneMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MinusOrThreeOrHigherMember" xlink:label="cli_MinusOrThreeOrHigherMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="cli_CreditRatingMoodysAndStandardPoorsDomain" xlink:to="cli_MinusOrThreeOrHigherMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityLineItems" xlink:label="us-gaap_LineOfCreditFacilityLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_LineOfCreditFacilityLineItems" xlink:to="us-gaap_LineOfCreditFacilityTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentCreditRating" xlink:label="us-gaap_DebtInstrumentCreditRating" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_LineOfCreditFacilityLineItems" xlink:to="us-gaap_DebtInstrumentCreditRating" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_LineOfCreditFacilityLineItems" xlink:to="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage" xlink:label="us-gaap_LineOfCreditFacilityCommitmentFeePercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_LineOfCreditFacilityLineItems" xlink:to="us-gaap_LineOfCreditFacilityCommitmentFeePercentage" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureMortgagesLoansPayableAndOtherObligationsNarrativeDetails" xlink:type="extended" xlink:title="41001 - Disclosure - Mortgages, Loans Payable And Other Obligations (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="us-gaap_DebtInstrumentTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="us-gaap_DebtInstrumentAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_DebtInstrumentTable" xlink:to="us-gaap_DebtInstrumentAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="us-gaap_DebtInstrumentNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_DebtInstrumentAxis" xlink:to="us-gaap_DebtInstrumentNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RevolvingCreditFacilityAndOtherVariableRateMortgageDebtMember" xlink:label="cli_RevolvingCreditFacilityAndOtherVariableRateMortgageDebtMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="cli_RevolvingCreditFacilityAndOtherVariableRateMortgageDebtMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_FixedRateDebtAndOtherObligationsMember" xlink:label="cli_FixedRateDebtAndOtherObligationsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="cli_FixedRateDebtAndOtherObligationsMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="us-gaap_DebtInstrumentLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NumberOfPropertiesWithEncumberedCompanyMortgages" xlink:label="cli_NumberOfPropertiesWithEncumberedCompanyMortgages" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="cli_NumberOfPropertiesWithEncumberedCompanyMortgages" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MortgagePropertyCarryingValue" xlink:label="cli_MortgagePropertyCarryingValue" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="cli_MortgagePropertyCarryingValue" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestPaid" xlink:label="us-gaap_InterestPaid" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_InterestPaid" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestCostsCapitalized" xlink:label="us-gaap_InterestCostsCapitalized" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_InterestCostsCapitalized" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongTermDebt" xlink:label="us-gaap_LongTermDebt" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_LongTermDebt" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LongtermDebtWeightedAverageInterestRate" xlink:label="us-gaap_LongtermDebtWeightedAverageInterestRate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_LongtermDebtWeightedAverageInterestRate" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureMortgagesLoansPayableAndOtherObligationsSummaryOfMortgagesLoansPayableAndOtherObligationsDetails" xlink:type="extended" xlink:title="41002 - Disclosure - Mortgages, Loans Payable And Other Obligations (Summary Of Mortgages, Loans Payable And Other Obligations) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="us-gaap_DebtInstrumentTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="us-gaap_DebtInstrumentAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_DebtInstrumentTable" xlink:to="us-gaap_DebtInstrumentAxis" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="us-gaap_DebtInstrumentNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_DebtInstrumentAxis" xlink:to="us-gaap_DebtInstrumentNameDomain" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_FiftyOneImcloneMember" xlink:label="cli_FiftyOneImcloneMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="cli_FiftyOneImcloneMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NineThousandTwoHundredEdmonstonRoadMember" xlink:label="cli_NineThousandTwoHundredEdmonstonRoadMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="cli_NineThousandTwoHundredEdmonstonRoadMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_SixThousandThreeHundredFiveIvyLaneMember" xlink:label="cli_SixThousandThreeHundredFiveIvyLaneMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="cli_SixThousandThreeHundredFiveIvyLaneMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PortImperialSouthFourAndFiveMember" xlink:label="cli_PortImperialSouthFourAndFiveMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="cli_PortImperialSouthFourAndFiveMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ThreeHundredNinetyFiveWestPassaicMember" xlink:label="cli_ThreeHundredNinetyFiveWestPassaicMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="cli_ThreeHundredNinetyFiveWestPassaicMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_SixThousandThreeHundredOneIvyLaneMember" xlink:label="cli_SixThousandThreeHundredOneIvyLaneMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="cli_SixThousandThreeHundredOneIvyLaneMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ThirtyFiveWaterviewBoulevardMember" xlink:label="cli_ThirtyFiveWaterviewBoulevardMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="cli_ThirtyFiveWaterviewBoulevardMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_SixBeckerEightyFiveLivingstonSeventyFiveLivingstonAndTwentyWaterviewMember" xlink:label="cli_SixBeckerEightyFiveLivingstonSeventyFiveLivingstonAndTwentyWaterviewMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="cli_SixBeckerEightyFiveLivingstonSeventyFiveLivingstonAndTwentyWaterviewMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_FourSylvanMember" xlink:label="cli_FourSylvanMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="cli_FourSylvanMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_TenIndependenceMember" xlink:label="cli_TenIndependenceMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="cli_TenIndependenceMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PortImperialSouthMember" xlink:label="cli_PortImperialSouthMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="cli_PortImperialSouthMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_FourBeckerMember" xlink:label="cli_FourBeckerMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="cli_FourBeckerMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_FiveBeckerMember" xlink:label="cli_FiveBeckerMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="cli_FiveBeckerMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_TwoHundredTenClayMember" xlink:label="cli_TwoHundredTenClayMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="cli_TwoHundredTenClayMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_VariousMember" xlink:label="cli_VariousMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="15" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="cli_VariousMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_TwentyThreeMainStreetMember" xlink:label="cli_TwentyThreeMainStreetMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="16" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="cli_TwentyThreeMainStreetMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HarborsidePlazaFiveMember" xlink:label="cli_HarborsidePlazaFiveMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="17" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="cli_HarborsidePlazaFiveMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_TwoHundredThirtyThreeCanoeBrookRoadMember" xlink:label="cli_TwoHundredThirtyThreeCanoeBrookRoadMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="18" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="cli_TwoHundredThirtyThreeCanoeBrookRoadMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_OneHundredWalnutAvenueMember" xlink:label="cli_OneHundredWalnutAvenueMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="19" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="cli_OneHundredWalnutAvenueMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_OneRiverCenterMember" xlink:label="cli_OneRiverCenterMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="20" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="cli_OneRiverCenterMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="us-gaap_DebtInstrumentLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_SecuredDebtNameOfProperty" xlink:label="cli_SecuredDebtNameOfProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="cli_SecuredDebtNameOfProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_SecuredDebtLendingInstitution" xlink:label="cli_SecuredDebtLendingInstitution" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="cli_SecuredDebtLendingInstitution" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_LiborInterestRate" xlink:label="cli_LiborInterestRate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="cli_LiborInterestRate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage" xlink:label="us-gaap_DebtInstrumentInterestRateEffectivePercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentInterestRateEffectivePercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SecuredDebt" xlink:label="us-gaap_SecuredDebt" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_SecuredDebt" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="us-gaap_DebtInstrumentMaturityDate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentMaturityDate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DiscontinuedOperationGainsLossesOnExtinguishmentOfDebt" xlink:label="cli_DiscontinuedOperationGainsLossesOnExtinguishmentOfDebt" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="cli_DiscontinuedOperationGainsLossesOnExtinguishmentOfDebt" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentageOfLeasedPropertyOccupied" xlink:label="cli_PercentageOfLeasedPropertyOccupied" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="cli_PercentageOfLeasedPropertyOccupied" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NumberOfPropertiesUsedToCollateralizeMortgage" xlink:label="cli_NumberOfPropertiesUsedToCollateralizeMortgage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="cli_NumberOfPropertiesUsedToCollateralizeMortgage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NumberOfImpairedRealEstateProperties" xlink:label="cli_NumberOfImpairedRealEstateProperties" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="cli_NumberOfImpairedRealEstateProperties" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureEmployeeBenefit401KPlansAndDeferredRetirementCompensationAgreementsDetails" xlink:type="extended" xlink:title="41101 - Disclosure - Employee Benefit 401(k) Plans And Deferred Retirement Compensation Agreements (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualPostretirementBenefitsTable" xlink:label="us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualPostretirementBenefitsTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="us-gaap_AwardTypeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualPostretirementBenefitsTable" xlink:to="us-gaap_AwardTypeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_AwardTypeAxis" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_635181354722249508" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="us-gaap_AwardTypeAxis" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_635181354722249508" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DeferredRetirementCompensationUnitsMember" xlink:label="cli_DeferredRetirementCompensationUnitsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="cli_DeferredRetirementCompensationUnitsMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_TitleOfIndividualAxis" xlink:label="us-gaap_TitleOfIndividualAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualPostretirementBenefitsTable" xlink:to="us-gaap_TitleOfIndividualAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="us-gaap_TitleOfIndividualWithRelationshipToEntityDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_TitleOfIndividualAxis" xlink:to="us-gaap_TitleOfIndividualWithRelationshipToEntityDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_635181354722249508" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="us-gaap_TitleOfIndividualAxis" xlink:to="us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_635181354722249508" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MessieurHershMember" xlink:label="cli_MessieurHershMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_TitleOfIndividualWithRelationshipToEntityDomain" xlink:to="cli_MessieurHershMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MessieurLefkowitzMember" xlink:label="cli_MessieurLefkowitzMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_TitleOfIndividualWithRelationshipToEntityDomain" xlink:to="cli_MessieurLefkowitzMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MessieurThomasMember" xlink:label="cli_MessieurThomasMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_TitleOfIndividualWithRelationshipToEntityDomain" xlink:to="cli_MessieurThomasMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="us-gaap_RangeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualPostretirementBenefitsTable" xlink:to="us-gaap_RangeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="us-gaap_RangeMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RangeAxis" xlink:to="us-gaap_RangeMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinimumMember" xlink:label="us-gaap_MinimumMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RangeMember" xlink:to="us-gaap_MinimumMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MaximumMember" xlink:label="us-gaap_MaximumMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_RangeMember" xlink:to="us-gaap_MaximumMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:label="us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:to="us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualPostretirementBenefitsTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_SavingsRetirementPlanEmployeeMinimumSubscriptionRate" xlink:label="cli_SavingsRetirementPlanEmployeeMinimumSubscriptionRate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:to="cli_SavingsRetirementPlanEmployeeMinimumSubscriptionRate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_SavingsRetirementPlanEmployeeMaximumSubscriptionRate" xlink:label="cli_SavingsRetirementPlanEmployeeMaximumSubscriptionRate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:to="cli_SavingsRetirementPlanEmployeeMaximumSubscriptionRate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_EmployeePreTaxContributionsVestedPercent" xlink:label="cli_EmployeePreTaxContributionsVestedPercent" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:to="cli_EmployeePreTaxContributionsVestedPercent" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_SavingsRetirementPlanVestingPeriod" xlink:label="cli_SavingsRetirementPlanVestingPeriod" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:to="cli_SavingsRetirementPlanVestingPeriod" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_VestingRate" xlink:label="cli_VestingRate" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:to="cli_VestingRate" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PercentVestedAfterTotalServicePeriod" xlink:label="cli_PercentVestedAfterTotalServicePeriod" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:to="cli_PercentVestedAfterTotalServicePeriod" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_SavingsRetirementPlanVestingRights" xlink:label="cli_SavingsRetirementPlanVestingRights" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:to="cli_SavingsRetirementPlanVestingRights" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeBenefitsAndShareBasedCompensation" xlink:label="us-gaap_EmployeeBenefitsAndShareBasedCompensation" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:to="us-gaap_EmployeeBenefitsAndShareBasedCompensation" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DefinedBenefitPlanAnnualEmployerContribution" xlink:label="cli_DefinedBenefitPlanAnnualEmployerContribution" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:to="cli_DefinedBenefitPlanAnnualEmployerContribution" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DefinedBenefitPlanPeriodUponWhichStockUnitsBecomePayableFollowingTriggeringEvent" xlink:label="cli_DefinedBenefitPlanPeriodUponWhichStockUnitsBecomePayableFollowingTriggeringEvent" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems" xlink:to="cli_DefinedBenefitPlanPeriodUponWhichStockUnitsBecomePayableFollowingTriggeringEvent" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureCommitmentsAndContingenciesNarrativeDetails" xlink:type="extended" xlink:title="41301 - Disclosure - Commitments And Contingencies (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_CommitmentsAndContingenciesTable" xlink:label="cli_CommitmentsAndContingenciesTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ContingentConsiderationByTypeAxis" xlink:label="us-gaap_ContingentConsiderationByTypeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="cli_CommitmentsAndContingenciesTable" xlink:to="us-gaap_ContingentConsiderationByTypeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ContingentConsiderationTypeDomain" xlink:label="us-gaap_ContingentConsiderationTypeDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ContingentConsiderationByTypeAxis" xlink:to="us-gaap_ContingentConsiderationTypeDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ContingentConsiderationTypeDomain" xlink:label="us-gaap_ContingentConsiderationTypeDomain_635181354722289496" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="us-gaap_ContingentConsiderationByTypeAxis" xlink:to="us-gaap_ContingentConsiderationTypeDomain_635181354722289496" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RoselandAssetsMember" xlink:label="cli_RoselandAssetsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_ContingentConsiderationTypeDomain" xlink:to="cli_RoselandAssetsMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_CompletionOfCertainDevelopmentsMember" xlink:label="cli_CompletionOfCertainDevelopmentsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ContingentConsiderationTypeDomain" xlink:to="cli_CompletionOfCertainDevelopmentsMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_StartOfConstructionOnCertainDevelopmentsMember" xlink:label="cli_StartOfConstructionOnCertainDevelopmentsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ContingentConsiderationTypeDomain" xlink:to="cli_StartOfConstructionOnCertainDevelopmentsMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ObtainingOfTaxCreditsGrantsMember" xlink:label="cli_ObtainingOfTaxCreditsGrantsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ContingentConsiderationTypeDomain" xlink:to="cli_ObtainingOfTaxCreditsGrantsMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_TotalReturnToShareholdersMember" xlink:label="cli_TotalReturnToShareholdersMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ContingentConsiderationTypeDomain" xlink:to="cli_TotalReturnToShareholdersMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_FailureToAchieveCertainLevelOfFeeRevenueMember" xlink:label="cli_FailureToAchieveCertainLevelOfFeeRevenueMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ContingentConsiderationTypeDomain" xlink:to="cli_FailureToAchieveCertainLevelOfFeeRevenueMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="us-gaap_BusinessAcquisitionAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="cli_CommitmentsAndContingenciesTable" xlink:to="us-gaap_BusinessAcquisitionAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="us-gaap_BusinessAcquisitionAcquireeDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_BusinessAcquisitionAxis" xlink:to="us-gaap_BusinessAcquisitionAcquireeDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RoselandPartnersLLCMember" xlink:label="cli_RoselandPartnersLLCMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_BusinessAcquisitionAcquireeDomain" xlink:to="cli_RoselandPartnersLLCMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="cli_CommitmentsAndContingenciesTable" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:label="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:to="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HarborsideFinancialCenterPlazaFouraMember" xlink:label="cli_HarborsideFinancialCenterPlazaFouraMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:to="cli_HarborsideFinancialCenterPlazaFouraMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HarborsideFinancialCenterPlazaFiveMember" xlink:label="cli_HarborsideFinancialCenterPlazaFiveMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:to="cli_HarborsideFinancialCenterPlazaFiveMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PortImperialFourAndFiveGarageDevelopmentMember" xlink:label="cli_PortImperialFourAndFiveGarageDevelopmentMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:to="cli_PortImperialFourAndFiveGarageDevelopmentMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="4" xlink:from="cli_CommitmentsAndContingenciesTable" xlink:to="us-gaap_PropertyPlantAndEquipmentByTypeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="us-gaap_PropertyPlantAndEquipmentTypeDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:to="us-gaap_PropertyPlantAndEquipmentTypeDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PropertyLockUpsMember" xlink:label="cli_PropertyLockUpsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="cli_PropertyLockUpsMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PropertyLockUpsExpiredMember" xlink:label="cli_PropertyLockUpsExpiredMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="cli_PropertyLockUpsExpiredMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="us-gaap_RangeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="5" xlink:from="cli_CommitmentsAndContingenciesTable" xlink:to="us-gaap_RangeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="us-gaap_RangeMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RangeAxis" xlink:to="us-gaap_RangeMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinimumMember" xlink:label="us-gaap_MinimumMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RangeMember" xlink:to="us-gaap_MinimumMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MaximumMember" xlink:label="us-gaap_MaximumMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_RangeMember" xlink:to="us-gaap_MaximumMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="6" xlink:from="cli_CommitmentsAndContingenciesTable" xlink:to="dei_LegalEntityAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ParentCompanyMember" xlink:label="us-gaap_ParentCompanyMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="dei_EntityDomain" xlink:to="us-gaap_ParentCompanyMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="7" xlink:from="cli_CommitmentsAndContingenciesTable" xlink:to="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="us-gaap_RelatedPartyDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="us-gaap_RelatedPartyDomain_635181354722329484" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain_635181354722329484" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_WegmansFoodMarketsIncMember" xlink:label="cli_WegmansFoodMarketsIncMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="cli_WegmansFoodMarketsIncMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="8" xlink:from="cli_CommitmentsAndContingenciesTable" xlink:to="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="us-gaap_EquityMethodInvesteeNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="us-gaap_EquityMethodInvesteeNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HarborsideResidentialProjectMember" xlink:label="cli_HarborsideResidentialProjectMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_EquityMethodInvesteeNameDomain" xlink:to="cli_HarborsideResidentialProjectMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_CommitmentsAndContingenciesLineItems" xlink:label="cli_CommitmentsAndContingenciesLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="cli_CommitmentsAndContingenciesTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ProjectTerm" xlink:label="cli_ProjectTerm" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="cli_ProjectTerm" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PaymentsInLieuOfPropertyTaxAsPercentageOfTotalProjectCost" xlink:label="cli_PaymentsInLieuOfPropertyTaxAsPercentageOfTotalProjectCost" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="cli_PaymentsInLieuOfPropertyTaxAsPercentageOfTotalProjectCost" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_EstimatedCostOfProject" xlink:label="cli_EstimatedCostOfProject" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="cli_EstimatedCostOfProject" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PaymentsInLieuOfPropertyTaxes" xlink:label="cli_PaymentsInLieuOfPropertyTaxes" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="cli_PaymentsInLieuOfPropertyTaxes" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PeriodOfRealEstateTaxesPhaseIn" xlink:label="cli_PeriodOfRealEstateTaxesPhaseIn" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="cli_PeriodOfRealEstateTaxesPhaseIn" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_OperatingLeaseExpense" xlink:label="cli_OperatingLeaseExpense" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="cli_OperatingLeaseExpense" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiability" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="us-gaap_BusinessCombinationContingentConsiderationLiability" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh" xlink:label="us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_BusinessAcquisitionContingentConsiderationEarnOutPeriod" xlink:label="cli_BusinessAcquisitionContingentConsiderationEarnOutPeriod" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="cli_BusinessAcquisitionContingentConsiderationEarnOutPeriod" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GoodwillPurchaseAccountingAdjustments" xlink:label="us-gaap_GoodwillPurchaseAccountingAdjustments" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="us-gaap_GoodwillPurchaseAccountingAdjustments" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1" xlink:label="us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_BusinessAcquisitionContingentConsiderationCashPaid" xlink:label="cli_BusinessAcquisitionContingentConsiderationCashPaid" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="cli_BusinessAcquisitionContingentConsiderationCashPaid" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_BusinessAcquisitionContingentConsiderationMeasurementPeriod" xlink:label="cli_BusinessAcquisitionContingentConsiderationMeasurementPeriod" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="cli_BusinessAcquisitionContingentConsiderationMeasurementPeriod" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_BusinessAcquisitionAcquireeCashDepositedToEscrow" xlink:label="cli_BusinessAcquisitionAcquireeCashDepositedToEscrow" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="15" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="cli_BusinessAcquisitionAcquireeCashDepositedToEscrow" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_BusinessAcquisitionContingentConsiderationDiscount" xlink:label="cli_BusinessAcquisitionContingentConsiderationDiscount" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="16" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="cli_BusinessAcquisitionContingentConsiderationDiscount" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_BusinessAcquisitionAcquireeAmountOfEscrowReleased" xlink:label="cli_BusinessAcquisitionAcquireeAmountOfEscrowReleased" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="17" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="cli_BusinessAcquisitionAcquireeAmountOfEscrowReleased" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfRealEstateProperties" xlink:label="us-gaap_NumberOfRealEstateProperties" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="18" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="us-gaap_NumberOfRealEstateProperties" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PropertyNetBookValue" xlink:label="cli_PropertyNetBookValue" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="19" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="cli_PropertyNetBookValue" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_PropertiesRestrictionForSaleExpirationPeriod" xlink:label="cli_PropertiesRestrictionForSaleExpirationPeriod" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="20" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="cli_PropertiesRestrictionForSaleExpirationPeriod" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DeliveryDateOfConstructedBuilding" xlink:label="cli_DeliveryDateOfConstructedBuilding" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="21" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="cli_DeliveryDateOfConstructedBuilding" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ConstructionAndDevelopmentCosts" xlink:label="us-gaap_ConstructionAndDevelopmentCosts" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="22" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="us-gaap_ConstructionAndDevelopmentCosts" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ConstructionAndDevelopmentCostsIncurred" xlink:label="cli_ConstructionAndDevelopmentCostsIncurred" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="23" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="cli_ConstructionAndDevelopmentCostsIncurred" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredTaxAssetsTaxCreditCarryforwards" xlink:label="us-gaap_DeferredTaxAssetsTaxCreditCarryforwards" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="24" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="us-gaap_DeferredTaxAssetsTaxCreditCarryforwards" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfUnitsInRealEstateProperty" xlink:label="us-gaap_NumberOfUnitsInRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="25" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="us-gaap_NumberOfUnitsInRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="us-gaap_EquityMethodInvestmentOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="26" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="us-gaap_EquityMethodInvestmentOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ThirdPartyOwnershipPercent" xlink:label="cli_ThirdPartyOwnershipPercent" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="27" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="cli_ThirdPartyOwnershipPercent" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_CapitalCreditReceivablePerSquareFoot" xlink:label="cli_CapitalCreditReceivablePerSquareFoot" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="28" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="cli_CapitalCreditReceivablePerSquareFoot" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AggregateCapitalCredits" xlink:label="cli_AggregateCapitalCredits" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="29" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="cli_AggregateCapitalCredits" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_AmountToFund" xlink:label="cli_AmountToFund" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="30" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="cli_AmountToFund" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AreaOfRealEstateProperty" xlink:label="us-gaap_AreaOfRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="31" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="us-gaap_AreaOfRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ObligationsFollowingCancelationOfProject" xlink:label="cli_ObligationsFollowingCancelationOfProject" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="32" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="cli_ObligationsFollowingCancelationOfProject" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NumberOfStoriesInRealEstateProperty" xlink:label="cli_NumberOfStoriesInRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="33" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="cli_NumberOfStoriesInRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NumberOfParkingSpaces" xlink:label="cli_NumberOfParkingSpaces" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="34" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="cli_NumberOfParkingSpaces" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_HoldingAndDistributionPatternUnderOperatingAgreement" xlink:label="cli_HoldingAndDistributionPatternUnderOperatingAgreement" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="35" xlink:from="cli_CommitmentsAndContingenciesLineItems" xlink:to="cli_HoldingAndDistributionPatternUnderOperatingAgreement" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureTenantLeasesDetails" xlink:type="extended" xlink:title="41401 - Disclosure - Tenant Leases (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertySubjectToOrAvailableForOperatingLeaseByMajorPropertyClassTable" xlink:label="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseByMajorPropertyClassTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis" xlink:label="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseByMajorPropertyClassTable" xlink:to="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain" xlink:label="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis" xlink:to="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain" xlink:label="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain_635181354722539421" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis" xlink:to="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain_635181354722539421" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_TenantLeasesMember" xlink:label="cli_TenantLeasesMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain" xlink:to="cli_TenantLeasesMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems" xlink:label="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems" xlink:to="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseByMajorPropertyClassTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableCurrent" xlink:label="us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableCurrent" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems" xlink:to="us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableCurrent" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears" xlink:label="us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems" xlink:to="us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears" xlink:label="us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems" xlink:to="us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears" xlink:label="us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems" xlink:to="us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears" xlink:label="us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems" xlink:to="us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter" xlink:label="us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems" xlink:to="us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable" xlink:label="us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems" xlink:to="us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LeaseExpirationDate1" xlink:label="us-gaap_LeaseExpirationDate1" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems" xlink:to="us-gaap_LeaseExpirationDate1" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureMackCaliRealtyCorporationStockholdersEquityShareRepurchaseProgramAndDividendReinvestmentAndStockPurchasePlanNarrativeDetails" xlink:type="extended" xlink:title="41501 - Disclosure - Mack-Cali Realty Corporation Stockholders' Equity (Share Repurchase Program And Dividend Reinvestment And Stock Purchase Plan) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MackCaliRealtyCorporationStockholdersEquityTable" xlink:label="cli_MackCaliRealtyCorporationStockholdersEquityTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="us-gaap_StatementScenarioAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="cli_MackCaliRealtyCorporationStockholdersEquityTable" xlink:to="us-gaap_StatementScenarioAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="us-gaap_ScenarioUnspecifiedDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_StatementScenarioAxis" xlink:to="us-gaap_ScenarioUnspecifiedDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DividendReinvestmentAndStockPurchasePlanMember" xlink:label="cli_DividendReinvestmentAndStockPurchasePlanMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_ScenarioUnspecifiedDomain" xlink:to="cli_DividendReinvestmentAndStockPurchasePlanMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MackCaliRealtyCorporationStockholdersEquityLineItems" xlink:label="cli_MackCaliRealtyCorporationStockholdersEquityLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="cli_MackCaliRealtyCorporationStockholdersEquityLineItems" xlink:to="cli_MackCaliRealtyCorporationStockholdersEquityTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MaximumPercentageOfOutstandingShareOwnedByRealEstateInvestmentTrust" xlink:label="cli_MaximumPercentageOfOutstandingShareOwnedByRealEstateInvestmentTrust" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="cli_MackCaliRealtyCorporationStockholdersEquityLineItems" xlink:to="cli_MaximumPercentageOfOutstandingShareOwnedByRealEstateInvestmentTrust" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DateShareRepurchaseProgramInitiation" xlink:label="cli_DateShareRepurchaseProgramInitiation" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="cli_MackCaliRealtyCorporationStockholdersEquityLineItems" xlink:to="cli_DateShareRepurchaseProgramInitiation" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockRepurchaseProgramAuthorizedAmount" xlink:label="us-gaap_StockRepurchaseProgramAuthorizedAmount" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="cli_MackCaliRealtyCorporationStockholdersEquityLineItems" xlink:to="us-gaap_StockRepurchaseProgramAuthorizedAmount" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodShares" xlink:label="us-gaap_StockRepurchasedAndRetiredDuringPeriodShares" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="cli_MackCaliRealtyCorporationStockholdersEquityLineItems" xlink:to="us-gaap_StockRepurchasedAndRetiredDuringPeriodShares" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsForRepurchaseOfEquity" xlink:label="us-gaap_PaymentsForRepurchaseOfEquity" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="cli_MackCaliRealtyCorporationStockholdersEquityLineItems" xlink:to="us-gaap_PaymentsForRepurchaseOfEquity" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount" xlink:label="us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="cli_MackCaliRealtyCorporationStockholdersEquityLineItems" xlink:to="us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" xlink:label="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="cli_MackCaliRealtyCorporationStockholdersEquityLineItems" xlink:to="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MonthlyCashInvestmentWithoutRestrictionMaximum" xlink:label="cli_MonthlyCashInvestmentWithoutRestrictionMaximum" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="cli_MackCaliRealtyCorporationStockholdersEquityLineItems" xlink:to="cli_MonthlyCashInvestmentWithoutRestrictionMaximum" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureMackCaliRealtyCorporationStockholdersEquityStockOptionsPlansNarrativeDetails" xlink:type="extended" xlink:title="41502 - Disclosure - Mack-Cali Realty Corporation Stockholders' Equity (Stock Options Plans) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="us-gaap_PlanNameAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:to="us-gaap_PlanNameAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="us-gaap_PlanNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_PlanNameAxis" xlink:to="us-gaap_PlanNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="us-gaap_PlanNameDomain_635181354722579409" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="us-gaap_PlanNameAxis" xlink:to="us-gaap_PlanNameDomain_635181354722579409" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_TwoThousandThirteenIncentiveStockPlanMember" xlink:label="cli_TwoThousandThirteenIncentiveStockPlanMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_PlanNameDomain" xlink:to="cli_TwoThousandThirteenIncentiveStockPlanMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_TwoThousandFourIncentiveStockPlanMember" xlink:label="cli_TwoThousandFourIncentiveStockPlanMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_PlanNameDomain" xlink:to="cli_TwoThousandFourIncentiveStockPlanMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_TwoThousandThirteenAndTwoThousandFourIncentiveStockPlansMember" xlink:label="cli_TwoThousandThirteenAndTwoThousandFourIncentiveStockPlansMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_PlanNameDomain" xlink:to="cli_TwoThousandThirteenAndTwoThousandFourIncentiveStockPlansMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_EmployeeAndDirectorPlanMember" xlink:label="cli_EmployeeAndDirectorPlanMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_PlanNameDomain" xlink:to="cli_EmployeeAndDirectorPlanMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_TwoThousandEmployeePlanMember" xlink:label="cli_TwoThousandEmployeePlanMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_PlanNameDomain" xlink:to="cli_TwoThousandEmployeePlanMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_TwoThousandDirectorPlanMember" xlink:label="cli_TwoThousandDirectorPlanMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_PlanNameDomain" xlink:to="cli_TwoThousandDirectorPlanMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_EmployeePlanMember" xlink:label="cli_EmployeePlanMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_PlanNameDomain" xlink:to="cli_EmployeePlanMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_TwoThousandDirectorPlanAndDirectorPlanMember" xlink:label="cli_TwoThousandDirectorPlanAndDirectorPlanMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_PlanNameDomain" xlink:to="cli_TwoThousandDirectorPlanAndDirectorPlanMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="us-gaap_RangeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:to="us-gaap_RangeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="us-gaap_RangeMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RangeAxis" xlink:to="us-gaap_RangeMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinimumMember" xlink:label="us-gaap_MinimumMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RangeMember" xlink:to="us-gaap_MinimumMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MaximumMember" xlink:label="us-gaap_MaximumMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_RangeMember" xlink:to="us-gaap_MaximumMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" xlink:label="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="us-gaap_CommonStockSharesIssued" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_CommonStockSharesIssued" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_StockOptionTerms" xlink:label="cli_StockOptionTerms" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="cli_StockOptionTerms" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageRemainingContractualTerm2" xlink:label="us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageRemainingContractualTerm2" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageRemainingContractualTerm2" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromStockOptionsExercised" xlink:label="us-gaap_ProceedsFromStockOptionsExercised" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_ProceedsFromStockOptionsExercised" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockOptionPlanExpense" xlink:label="us-gaap_StockOptionPlanExpense" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_StockOptionPlanExpense" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureMackCaliRealtyCorporationStockholdersEquityRestrictedStockAwardsAndTsrBasedAwardsNarrativeDetails" xlink:type="extended" xlink:title="41503 - Disclosure - Mack-Cali Realty Corporation Stockholders' Equity (Restricted Stock Awards And TSR-Based Awards) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MackCaliRealtyCorporationStockholdersEquityTable" xlink:label="cli_MackCaliRealtyCorporationStockholdersEquityTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="us-gaap_StatementScenarioAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="cli_MackCaliRealtyCorporationStockholdersEquityTable" xlink:to="us-gaap_StatementScenarioAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="us-gaap_ScenarioUnspecifiedDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_StatementScenarioAxis" xlink:to="us-gaap_ScenarioUnspecifiedDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioForecastMember" xlink:label="us-gaap_ScenarioForecastMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_ScenarioUnspecifiedDomain" xlink:to="us-gaap_ScenarioForecastMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="us-gaap_AwardTypeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="cli_MackCaliRealtyCorporationStockholdersEquityTable" xlink:to="us-gaap_AwardTypeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_AwardTypeAxis" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="us-gaap_RestrictedStockMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="us-gaap_RestrictedStockMember" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RatifiedRestrictedStockAwardsMember" xlink:label="cli_RatifiedRestrictedStockAwardsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="cli_RatifiedRestrictedStockAwardsMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_TotalStockholderReturnBasedAwardsMember" xlink:label="cli_TotalStockholderReturnBasedAwardsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="cli_TotalStockholderReturnBasedAwardsMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="us-gaap_RangeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="3" xlink:from="cli_MackCaliRealtyCorporationStockholdersEquityTable" xlink:to="us-gaap_RangeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="us-gaap_RangeMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RangeAxis" xlink:to="us-gaap_RangeMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinimumMember" xlink:label="us-gaap_MinimumMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RangeMember" xlink:to="us-gaap_MinimumMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MaximumMember" xlink:label="us-gaap_MaximumMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_RangeMember" xlink:to="us-gaap_MaximumMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="cli_MackCaliRealtyCorporationStockholdersEquityTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RestrictedStockAwardVestingPeriod" xlink:label="cli_RestrictedStockAwardVestingPeriod" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="cli_RestrictedStockAwardVestingPeriod" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RestrictedStockAwardsUnvestedSharesOutstandingPerformanceContingent" xlink:label="cli_RestrictedStockAwardsUnvestedSharesOutstandingPerformanceContingent" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="cli_RestrictedStockAwardsUnvestedSharesOutstandingPerformanceContingent" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ValueOfCommonStockReceivedUponVestingOfAwards" xlink:label="cli_ValueOfCommonStockReceivedUponVestingOfAwards" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="cli_ValueOfCommonStockReceivedUponVestingOfAwards" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureMackCaliRealtyCorporationStockholdersEquityEarningsPerShareNarrativeDetails" xlink:type="extended" xlink:title="41506 - Disclosure - Mack-Cali Realty Corporation Stockholders' Equity (Earnings Per Share) (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="us-gaap_AwardTypeAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:to="us-gaap_AwardTypeAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_AwardTypeAxis" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="us-gaap_RestrictedStockMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="us-gaap_RestrictedStockMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockDividendsPerShareDeclared" xlink:label="us-gaap_CommonStockDividendsPerShareDeclared" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="us-gaap_CommonStockDividendsPerShareDeclared" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureNoncontrollingInterestsInSubsidiariesNarrativeDetails" xlink:type="extended" xlink:title="41601 - Disclosure - Noncontrolling Interests In Subsidiaries (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinorityInterestTable" xlink:label="us-gaap_MinorityInterestTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis" xlink:label="us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_MinorityInterestTable" xlink:to="us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain" xlink:label="us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis" xlink:to="us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BuildingMember" xlink:label="us-gaap_BuildingMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_MortgageLoansOnRealEstateNamePropertyTypeDomain" xlink:to="us-gaap_BuildingMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="2" xlink:from="us-gaap_MinorityInterestTable" xlink:to="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="us-gaap_RelatedPartyDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_ParticipationRightsMember" xlink:label="cli_ParticipationRightsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="cli_ParticipationRightsMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinorityInterestLineItems" xlink:label="us-gaap_MinorityInterestLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_MinorityInterestLineItems" xlink:to="us-gaap_MinorityInterestTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NumberOfCommonSharesReceivedUponRedemptionOfCommonUnits" xlink:label="cli_NumberOfCommonSharesReceivedUponRedemptionOfCommonUnits" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_MinorityInterestLineItems" xlink:to="cli_NumberOfCommonSharesReceivedUponRedemptionOfCommonUnits" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RebalanceOfOwnershipPercentage" xlink:label="cli_RebalanceOfOwnershipPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_MinorityInterestLineItems" xlink:to="cli_RebalanceOfOwnershipPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners" xlink:label="us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_MinorityInterestLineItems" xlink:to="us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfRealEstateProperties" xlink:label="us-gaap_NumberOfRealEstateProperties" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_MinorityInterestLineItems" xlink:to="us-gaap_NumberOfRealEstateProperties" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AreaOfRealEstateProperty" xlink:label="us-gaap_AreaOfRealEstateProperty" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_MinorityInterestLineItems" xlink:to="us-gaap_AreaOfRealEstateProperty" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DistributionOfCashFlowToIndividualCompaniesPercentage" xlink:label="cli_DistributionOfCashFlowToIndividualCompaniesPercentage" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_MinorityInterestLineItems" xlink:to="cli_DistributionOfCashFlowToIndividualCompaniesPercentage" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_InternalRateOfReturn" xlink:label="cli_InternalRateOfReturn" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_MinorityInterestLineItems" xlink:to="cli_InternalRateOfReturn" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureSegmentReportingNarrativeDetails" xlink:type="extended" xlink:title="41701 - Disclosure - Segment Reporting (Narrative) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="us-gaap_StatementGeographicalAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:to="us-gaap_StatementGeographicalAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="us-gaap_SegmentGeographicalDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_StatementGeographicalAxis" xlink:to="us-gaap_SegmentGeographicalDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ForeignCountryMember" xlink:label="us-gaap_ForeignCountryMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_SegmentGeographicalDomain" xlink:to="us-gaap_ForeignCountryMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="us-gaap_SegmentReportingInformationLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfReportableSegments" xlink:label="us-gaap_NumberOfReportableSegments" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_NumberOfReportableSegments" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Revenues" xlink:label="us-gaap_Revenues" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_Revenues" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NoncurrentAssets" xlink:label="us-gaap_NoncurrentAssets" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_NoncurrentAssets" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureSegmentReportingSelectedResultsOfOperationsAndAssetInformationDetails" xlink:type="extended" xlink:title="41702 - Disclosure - Segment Reporting (Selected Results Of Operations And Asset Information) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="us-gaap_StatementBusinessSegmentsAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:to="us-gaap_StatementBusinessSegmentsAxis" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentDomain" xlink:label="us-gaap_SegmentDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_StatementBusinessSegmentsAxis" xlink:to="us-gaap_SegmentDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentDomain" xlink:label="us-gaap_SegmentDomain_635181354722709370" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="us-gaap_StatementBusinessSegmentsAxis" xlink:to="us-gaap_SegmentDomain_635181354722709370" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RealEstateCommercialAndOtherSegmentMember" xlink:label="cli_RealEstateCommercialAndOtherSegmentMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_SegmentDomain" xlink:to="cli_RealEstateCommercialAndOtherSegmentMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_RealEstateMultipleFamilySegmentMember" xlink:label="cli_RealEstateMultipleFamilySegmentMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_SegmentDomain" xlink:to="cli_RealEstateMultipleFamilySegmentMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_MultipleFamilyServicesSegmentMember" xlink:label="cli_MultipleFamilyServicesSegmentMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_SegmentDomain" xlink:to="cli_MultipleFamilyServicesSegmentMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CorporateAndOtherMember" xlink:label="us-gaap_CorporateAndOtherMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_SegmentDomain" xlink:to="us-gaap_CorporateAndOtherMember" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="us-gaap_SegmentReportingInformationLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateRevenueNet" xlink:label="us-gaap_RealEstateRevenueNet" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_RealEstateRevenueNet" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_OperatingAndInterestExpenses" xlink:label="cli_OperatingAndInterestExpenses" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="cli_OperatingAndInterestExpenses" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestments" xlink:label="us-gaap_IncomeLossFromEquityMethodInvestments" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_IncomeLossFromEquityMethodInvestments" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_SegmentReportingInformationNetOperatingIncomeLossForReportableSegment" xlink:label="cli_SegmentReportingInformationNetOperatingIncomeLossForReportableSegment" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="cli_SegmentReportingInformationNetOperatingIncomeLossForReportableSegment" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Assets" xlink:label="us-gaap_Assets" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_Assets" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_LongLivedAssets" xlink:label="cli_LongLivedAssets" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="cli_LongLivedAssets" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyManagementFeeRevenue" xlink:label="us-gaap_PropertyManagementFeeRevenue" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_PropertyManagementFeeRevenue" priority="1" use="optional" />
  </definitionLink>
  <definitionLink xlink:role="http://www.mack-cali.com/role/DisclosureSegmentReportingScheduleOfReconciliationOfNetOperatingIncomeToIncomeFromContinuingOperationsDetails" xlink:type="extended" xlink:title="41703 - Disclosure - Segment Reporting (Schedule Of Reconciliation Of Net Operating Income To Income From Continuing Operations) (Details)">
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ConsolidationItemsAxis" xlink:label="us-gaap_ConsolidationItemsAxis" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" order="1" xlink:from="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:to="us-gaap_ConsolidationItemsAxis" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="us-gaap_ConsolidationItemsDomain" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" order="1" xlink:from="us-gaap_ConsolidationItemsAxis" xlink:to="us-gaap_ConsolidationItemsDomain" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="us-gaap_ConsolidationItemsDomain_635181354722729364" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" order="1" xlink:from="us-gaap_ConsolidationItemsAxis" xlink:to="us-gaap_ConsolidationItemsDomain_635181354722729364" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingSegmentsMember" xlink:label="us-gaap_OperatingSegmentsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="1" xlink:from="us-gaap_ConsolidationItemsDomain" xlink:to="us-gaap_OperatingSegmentsMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MaterialReconcilingItemsMember" xlink:label="us-gaap_MaterialReconcilingItemsMember" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_ConsolidationItemsDomain" xlink:to="us-gaap_MaterialReconcilingItemsMember" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="us-gaap_SegmentReportingInformationLineItems" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" order="1" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" use="optional" xbrldt:contextElement="segment" xbrldt:closed="true" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_SegmentReportingInformationNetOperatingIncomeLossForReportableSegment" xlink:label="cli_SegmentReportingInformationNetOperatingIncomeLossForReportableSegment" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="2" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="cli_SegmentReportingInformationNetOperatingIncomeLossForReportableSegment" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DepreciationAndAmortization" xlink:label="us-gaap_DepreciationAndAmortization" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="3" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_DepreciationAndAmortization" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt" xlink:label="us-gaap_GainsLossesOnExtinguishmentOfDebt" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="4" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_GainsLossesOnExtinguishmentOfDebt" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetImpairmentCharges" xlink:label="us-gaap_AssetImpairmentCharges" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="5" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_AssetImpairmentCharges" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest" xlink:label="us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="6" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax" xlink:label="us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="7" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_DiscontinuedOperationGainsLossesOnExtinguishmentOfDebt" xlink:label="cli_DiscontinuedOperationGainsLossesOnExtinguishmentOfDebt" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="8" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="cli_DiscontinuedOperationGainsLossesOnExtinguishmentOfDebt" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GainLossOnDispositionOfAssets" xlink:label="us-gaap_GainLossOnDispositionOfAssets" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="9" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_GainLossOnDispositionOfAssets" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax" xlink:label="us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="10" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProfitLoss" xlink:label="us-gaap_ProfitLoss" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="11" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_ProfitLoss" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NoncontrollingInterestInNetIncomeLossJointVenturePartnersNonredeemable" xlink:label="us-gaap_NoncontrollingInterestInNetIncomeLossJointVenturePartnersNonredeemable" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="12" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_NoncontrollingInterestInNetIncomeLossJointVenturePartnersNonredeemable" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NoncontrollingInterestInNetIncomeLossOperatingPartnershipsNonredeemable" xlink:label="us-gaap_NoncontrollingInterestInNetIncomeLossOperatingPartnershipsNonredeemable" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="13" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_NoncontrollingInterestInNetIncomeLossOperatingPartnershipsNonredeemable" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="cli-20130930.xsd#cli_NoncontrollingInterestInDiscontinuedOperations" xlink:label="cli_NoncontrollingInterestInDiscontinuedOperations" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="14" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="cli_NoncontrollingInterestInDiscontinuedOperations" priority="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="us-gaap_NetIncomeLoss" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" order="15" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_NetIncomeLoss" priority="1" use="optional" />
  </definitionLink>
</linkbase>
