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  <element id="cli_EquityMethodInvestmentSummarizedFinancialInformationDepreciationAndAmortization" name="EquityMethodInvestmentSummarizedFinancialInformationDepreciationAndAmortization" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cli_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense" name="EquityMethodInvestmentSummarizedFinancialInformationInterestExpense" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cli_EquityMethodInvestmentSummarizedFinancialInformationRentalPropertyNet" name="EquityMethodInvestmentSummarizedFinancialInformationRentalPropertyNet" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="cli_EquityMethodInvestmentSummarizedFinancialInformationOtherAssets" name="EquityMethodInvestmentSummarizedFinancialInformationOtherAssets" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="cli_EquityMethodInvestmentSummarizedFinancialInformationSecuredDebt" name="EquityMethodInvestmentSummarizedFinancialInformationSecuredDebt" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="cli_EstimatedCostOfProject" name="EstimatedCostOfProject" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cli_PropertyLockUpsMember" name="PropertyLockUpsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PropertyLockUpsExpiredMember" name="PropertyLockUpsExpiredMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_EquityMethodInvestmentSummarizedFinancialInformationOtherLiabilities" name="EquityMethodInvestmentSummarizedFinancialInformationOtherLiabilities" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="cli_HoldingAndDistributionPatternUnderOperatingAgreement" name="HoldingAndDistributionPatternUnderOperatingAgreement" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_NoncontrollingInterestInDiscontinuedOperations" name="NoncontrollingInterestInDiscontinuedOperations" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cli_InternalRateOfReturn" name="InternalRateOfReturn" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_RevolvingCreditFacilityAndOtherVariableRateMortgageDebtMember" name="RevolvingCreditFacilityAndOtherVariableRateMortgageDebtMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_FixedRateDebtAndOtherObligationsMember" name="FixedRateDebtAndOtherObligationsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PropertiesRestrictionForSaleExpirationPeriod" name="PropertiesRestrictionForSaleExpirationPeriod" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_CommonUnitsOutstanding" name="CommonUnitsOutstanding" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_LineOfCreditFacilityInSupportOfDebtInstrumentFairValueOfAmountOutstanding" name="LineOfCreditFacilityInSupportOfDebtInstrumentFairValueOfAmountOutstanding" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="cli_ManagementLeasingAndOtherServicesFees" name="ManagementLeasingAndOtherServicesFees" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cli_LineOfCreditFacilityBidFeatureCurrentBorrowingCapacity" name="LineOfCreditFacilityBidFeatureCurrentBorrowingCapacity" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="cli_RestrictedStockAwardsUnvestedSharesOutstandingPerformanceContingent" name="RestrictedStockAwardsUnvestedSharesOutstandingPerformanceContingent" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_MortgageLoanMaturityPeriod" name="MortgageLoanMaturityPeriod" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_VenturePropertyAcquisitionCost" name="VenturePropertyAcquisitionCost" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cli_OperatingLeaseExpense" name="OperatingLeaseExpense" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cli_MackCaliRealtyCorporationStockholdersEquityTable" name="MackCaliRealtyCorporationStockholdersEquityTable" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" xbrli:periodType="duration" />
  <element id="cli_LiborInterestRate" name="LiborInterestRate" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_LoanCarryingAmount" name="LoanCarryingAmount" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="cli_PropertyNetBookValue" name="PropertyNetBookValue" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cli_IncomeLossFromDiscontinuedOperationsAvailableToCommonShareholders" name="IncomeLossFromDiscontinuedOperationsAvailableToCommonShareholders" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cli_CommonUnitsRedeemedForCommonShares" name="CommonUnitsRedeemedForCommonShares" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_RebalanceOfOwnershipPercentage" name="RebalanceOfOwnershipPercentage" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cli_DeliveryDateOfConstructedBuilding" name="DeliveryDateOfConstructedBuilding" nillable="true" type="invest:dateStringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_NumberOfPropertiesWithEncumberedCompanyMortgages" name="NumberOfPropertiesWithEncumberedCompanyMortgages" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_DeferredFinancingCostsPolicyTextBlock" name="DeferredFinancingCostsPolicyTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_DeferredLeasingCostsPolicyTextBlock" name="DeferredLeasingCostsPolicyTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_DividendsAndDistributionsPayablePolicyTextBlock" name="DividendsAndDistributionsPayablePolicyTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_IssuanceCostsPolicyTextBlock" name="IssuanceCostsPolicyTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_OtherComprehensiveIncomePolicyTextBlock" name="OtherComprehensiveIncomePolicyTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_LineOfCreditFacilityExpandableMaximumBorrowingCapacity" name="LineOfCreditFacilityExpandableMaximumBorrowingCapacity" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="cli_NoRatingsOrLessThanBbbMinusBaaThreeMember" name="NoRatingsOrLessThanBbbMinusBaaThreeMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_BbbMinusOrBaaThreeMember" name="BbbMinusOrBaaThreeMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_BbbOrBaaTwoCurrentMember" name="BbbOrBaaTwoCurrentMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_BbbPlusOrBaaOneMember" name="BbbPlusOrBaaOneMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_MinusOrThreeOrHigherMember" name="MinusOrThreeOrHigherMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_LineOfCreditFacilityExtensionPeriod" name="LineOfCreditFacilityExtensionPeriod" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PercentVestedAfterTotalServicePeriod" name="PercentVestedAfterTotalServicePeriod" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_EmployeePreTaxContributionsVestedPercent" name="EmployeePreTaxContributionsVestedPercent" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ConstructionAndDevelopmentCostsIncurred" name="ConstructionAndDevelopmentCostsIncurred" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cli_HarborsideResidentialProjectMember" name="HarborsideResidentialProjectMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ThirdPartyOwnershipPercent" name="ThirdPartyOwnershipPercent" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_CapitalCreditReceivablePerSquareFoot" name="CapitalCreditReceivablePerSquareFoot" nillable="true" type="us-types:perUnitItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_MaximumPercentageOfRetainerFeeDirectorsMayElectToDeferToStockUnits" name="MaximumPercentageOfRetainerFeeDirectorsMayElectToDeferToStockUnits" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_TwoThousandEmployeePlanMember" name="TwoThousandEmployeePlanMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_TwoThousandDirectorPlanMember" name="TwoThousandDirectorPlanMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_StamfordSmLlcMember" name="StamfordSmLlcMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_CommitmentsAndContingenciesLineItems" name="CommitmentsAndContingenciesLineItems" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="cli_LineOfCreditFacilityBasisPointFacilityFee" name="LineOfCreditFacilityBasisPointFacilityFee" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_DistributionOfCashFlowToIndividualCompaniesPercentage" name="DistributionOfCashFlowToIndividualCompaniesPercentage" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_VestingRate" name="VestingRate" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_MezzLoanMember" name="MezzLoanMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ClassPortfolioInStamfordConnecticutMember" name="ClassPortfolioInStamfordConnecticutMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ClassOfficeSpaceMember" name="ClassOfficeSpaceMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_StamfordSMLLCMember" name="StamfordSMLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ResidentialSpaceMember" name="ResidentialSpaceMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_NetInvestmentInRentalPropertyAndRentalPropertyHeldForSale" name="NetInvestmentInRentalPropertyAndRentalPropertyHeldForSale" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="cli_ThresholdOfWhichExcessProceedsArePaidToThirdParty" name="ThresholdOfWhichExcessProceedsArePaidToThirdParty" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cli_TenantLeasesMember" name="TenantLeasesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ParticipationRightsMember" name="ParticipationRightsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_FutureDevelopmentsMember" name="FutureDevelopmentsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_MonthlyCashInvestmentWithoutRestrictionMaximum" name="MonthlyCashInvestmentWithoutRestrictionMaximum" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cli_DividendReinvestmentAndStockPurchasePlanMember" name="DividendReinvestmentAndStockPurchasePlanMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_IncreaseDecreaseInUnbilledRentReceivables" name="IncreaseDecreaseInUnbilledRentReceivables" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cli_RentalPropertyAbstract" name="RentalPropertyAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="cli_CapitalizedDevelopmentConstructionSalariesAndOtherRelatedExpenses" name="CapitalizedDevelopmentConstructionSalariesAndOtherRelatedExpenses" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cli_EquityMethodInvestmentSummarizedFinancialInformationLoansReceivable" name="EquityMethodInvestmentSummarizedFinancialInformationLoansReceivable" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="cli_NumberOfPropertiesUsedToCollateralizeMortgage" name="NumberOfPropertiesUsedToCollateralizeMortgage" nillable="true" type="xbrli:positiveIntegerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_FourPointFiveZeroZeroPercentSeniorUnsecuredNotesDueAprilEighteenTwoThousandTwentyTwoMember" name="FourPointFiveZeroZeroPercentSeniorUnsecuredNotesDueAprilEighteenTwoThousandTwentyTwoMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_MaximumPeriodAfterCessationOfMajorConstructionActivityThatProjectsAreConsideredComplete" name="MaximumPeriodAfterCessationOfMajorConstructionActivityThatProjectsAreConsideredComplete" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_AllowanceForDoubtfulAccountsPolicyPolicyTextBlock" name="AllowanceForDoubtfulAccountsPolicyPolicyTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_NumberOfParkingSpaces" name="NumberOfParkingSpaces" nillable="true" type="xbrli:positiveIntegerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_NumberOfCommonSharesReceivedUponRedemptionOfCommonUnits" name="NumberOfCommonSharesReceivedUponRedemptionOfCommonUnits" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_BusinessAcquisitionContingentConsiderationMeasurementPeriod" name="BusinessAcquisitionContingentConsiderationMeasurementPeriod" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_BusinessAcquisitionAcquireeCashDepositedToEscrow" name="BusinessAcquisitionAcquireeCashDepositedToEscrow" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cli_WegmansFoodMarketsIncMember" name="WegmansFoodMarketsIncMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_RatifiedRestrictedStockAwardsMember" name="RatifiedRestrictedStockAwardsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_TotalStockholderReturnBasedAwardsMember" name="TotalStockholderReturnBasedAwardsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ValueOfCommonStockReceivedUponVestingOfAwards" name="ValueOfCommonStockReceivedUponVestingOfAwards" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_DefinedBenefitPlanAnnualEmployerContribution" name="DefinedBenefitPlanAnnualEmployerContribution" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cli_MessieurHershMember" name="MessieurHershMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_MessieurLefkowitzMember" name="MessieurLefkowitzMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_MessieurThomasMember" name="MessieurThomasMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_DefinedBenefitPlanPeriodUponWhichStockUnitsBecomePayableFollowingTriggeringEvent" name="DefinedBenefitPlanPeriodUponWhichStockUnitsBecomePayableFollowingTriggeringEvent" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_BusinessAcquisitionContingentConsiderationEarnOutPeriod" name="BusinessAcquisitionContingentConsiderationEarnOutPeriod" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_SavingsRetirementPlanEmployeeMinimumSubscriptionRate" name="SavingsRetirementPlanEmployeeMinimumSubscriptionRate" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_SavingsRetirementPlanEmployeeMaximumSubscriptionRate" name="SavingsRetirementPlanEmployeeMaximumSubscriptionRate" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_SavingsRetirementPlanVestingPeriod" name="SavingsRetirementPlanVestingPeriod" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_SavingsRetirementPlanVestingRights" name="SavingsRetirementPlanVestingRights" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_CommonStockDividendsAndCommonUnitDistributionsPerShare" name="CommonStockDividendsAndCommonUnitDistributionsPerShare" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_TwoPointFiveZeroZeroPercentSeniorUnsecuredNotesDueDecemberFifteenTwoThousandSeventeenMember" name="TwoPointFiveZeroZeroPercentSeniorUnsecuredNotesDueDecemberFifteenTwoThousandSeventeenMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_UnconsolidatedJointVentureOfficeBuildingsMember" name="UnconsolidatedJointVentureOfficeBuildingsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_UnconsolidatedJointVentureRetailBuildingsMember" name="UnconsolidatedJointVentureRetailBuildingsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_UnconsolidatedJointVentureMultipleFamilyPropertiesMember" name="UnconsolidatedJointVentureMultipleFamilyPropertiesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_UnconsolidatedJointVentureHotelMember" name="UnconsolidatedJointVentureHotelMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_UnconsolidatedJointVentureCommercialPropertyMember" name="UnconsolidatedJointVentureCommercialPropertyMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_UnconsolidatedJointVentureDevelopmentProjectsMember" name="UnconsolidatedJointVentureDevelopmentProjectsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_UnconsolidatedJointVentureLandParcelsMember" name="UnconsolidatedJointVentureLandParcelsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ScheduleOfEquityInEarningsLossEquityMethodInvestmentsTableTextBlock" name="ScheduleOfEquityInEarningsLossEquityMethodInvestmentsTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ScheduleOfEquityMethodInvestmentsTableTextBlock" name="ScheduleOfEquityMethodInvestmentsTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_MarbellaRoseGardenLLCMember" name="MarbellaRoseGardenLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PlazaEightAndNineAssociatesLLCMember" name="PlazaEightAndNineAssociatesLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_SouthPierAtHarborsideMember" name="SouthPierAtHarborsideMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_RedBankCorporatePlazaLLCMember" name="RedBankCorporatePlazaLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_TwelveVreelandAssociatesLLCMember" name="TwelveVreelandAssociatesLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_RoseGardenMonacoHoldingsLLCMember" name="RoseGardenMonacoHoldingsLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_RosewoodLafayetteHoldingsLLCMember" name="RosewoodLafayetteHoldingsLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PruRosePortImperialSouthFifteenLLCMember" name="PruRosePortImperialSouthFifteenLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_RosewoodMorristownLLCMember" name="RosewoodMorristownLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_OverlookRidgeLLCMember" name="OverlookRidgeLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_OverlookRidgeJvTwoCAndThreeBLLCMember" name="OverlookRidgeJvTwoCAndThreeBLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_RoselandNorthRetailLLCMember" name="RoselandNorthRetailLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_BNESAssociatesIIIMember" name="BNESAssociatesIIIMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PortsideMasterCompanyLLCMember" name="PortsideMasterCompanyLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PruRosePortImperialSouthThirteenLLCMember" name="PruRosePortImperialSouthThirteenLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_RoselandPortImperialPartnersLPMember" name="RoselandPortImperialPartnersLPMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_RoseGardenMarbellaSouthLLCMember" name="RoseGardenMarbellaSouthLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PruRoseRiverwalkGLLCMember" name="PruRoseRiverwalkGLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ElmajoUrbanRenewalAssociatesLLCMember" name="ElmajoUrbanRenewalAssociatesLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_RiverparkAtHarrisonILLCMember" name="RiverparkAtHarrisonILLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_RoseGardenMonacoLLCMember" name="RoseGardenMonacoLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_HillsboroughTwoHundredSixHoldingsLLCMember" name="HillsboroughTwoHundredSixHoldingsLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_GrandJerseyWaterfrontUrbanRenewalAssociatesLLCMember" name="GrandJerseyWaterfrontUrbanRenewalAssociatesLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_NumberOfStoriesInRealEstateProperty" name="NumberOfStoriesInRealEstateProperty" nillable="true" type="xbrli:positiveIntegerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_IndirectResidualOwnershipPercentage" name="IndirectResidualOwnershipPercentage" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_PruRoseMarbellaILLCMember" name="PruRoseMarbellaILLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_InvestmentsInUnconsolidatedJointVentuesByNameAxis" name="InvestmentsInUnconsolidatedJointVentuesByNameAxis" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" xbrli:periodType="duration" />
  <element id="cli_InvestmentsInUnconsolidatedJointVentuesByNameDomain" name="InvestmentsInUnconsolidatedJointVentuesByNameDomain" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_InvestmentOwnershipPercentage" name="InvestmentOwnershipPercentage" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_RoseGardenMonacoHoldingsInterestInMonacoHoldingsMember" name="RoseGardenMonacoHoldingsInterestInMonacoHoldingsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_MonacoHoldingsInterestInPruRoseMonacoHoldingsMember" name="MonacoHoldingsInterestInPruRoseMonacoHoldingsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_MarbellaRoseGardenSInterestInPruRoseMarbellaIMember" name="MarbellaRoseGardenSInterestInPruRoseMarbellaIMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PrudentialMarbellaPartnershipMember" name="PrudentialMarbellaPartnershipMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PruRoseMonacoHoldingsLLCMember" name="PruRoseMonacoHoldingsLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PrudentialInsuranceCompanyOfAmericaMember" name="PrudentialInsuranceCompanyOfAmericaMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_AccumulatedUnpaidOperatingReturn" name="AccumulatedUnpaidOperatingReturn" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="cli_RosewoodLafayatteHoldingsInterestInRosewoodLafayetteCommonsMember" name="RosewoodLafayatteHoldingsInterestInRosewoodLafayetteCommonsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_RosewoodLafayetteCommonsLLCMember" name="RosewoodLafayetteCommonsLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PrudentialMember" name="PrudentialMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PrudentialPortMember" name="PrudentialPortMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PercentOfDistributionsPaidToThirdPartyAfterThresholdReached" name="PercentOfDistributionsPaidToThirdPartyAfterThresholdReached" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ThresholdOfInternalRateOfReturnForDistributionsToThirdParty" name="ThresholdOfInternalRateOfReturnForDistributionsToThirdParty" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_RosewoodMorristownSInterestInMorristownEpsteinsMember" name="RosewoodMorristownSInterestInMorristownEpsteinsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_NumberOfUnsoldUnits" name="NumberOfUnsoldUnits" nillable="true" type="xbrli:positiveIntegerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_LoftsAtFortyParkPropertyMember" name="LoftsAtFortyParkPropertyMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_MorristownEpsteinsLLCMember" name="MorristownEpsteinsLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_FortyParkCondominiumPropertyMember" name="FortyParkCondominiumPropertyMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_MetropolitanPropertyMember" name="MetropolitanPropertyMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PreferredRateOfReturn" name="PreferredRateOfReturn" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_InterestInNetSalesProceeds" name="InterestInNetSalesProceeds" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PrIIMorristownPrudentialLLCMember" name="PrIIMorristownPrudentialLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_EpsteinsBRentalsLLCMember" name="EpsteinsBRentalsLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_AdjustedPartnersCapital" name="AdjustedPartnersCapital" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="cli_OverlookRidgeJVLLCMember" name="OverlookRidgeJVLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_QuarrystoneIPropertyMember" name="QuarrystoneIPropertyMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_OverlookPhaseIIIMember" name="OverlookPhaseIIIMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_OverlookRidgeJVsInterestInLRJVCAssociatesMember" name="OverlookRidgeJVsInterestInLRJVCAssociatesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_OverlookRidgeJVsInterestInLROverlookPhaseIIIMember" name="OverlookRidgeJVsInterestInLROverlookPhaseIIIMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_LennarMassachusettsPropertiesMember" name="LennarMassachusettsPropertiesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_LRJVCAssociatesLLCMember" name="LRJVCAssociatesLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_LROverlookPhaseIIILLCMember" name="LROverlookPhaseIIILLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_AmountOfDebtGuaranteedByCompany" name="AmountOfDebtGuaranteedByCompany" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="cli_NotionalLandCapital" name="NotionalLandCapital" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="cli_RoweMember" name="RoweMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PercentageOfNotionalLandCapitalAccount" name="PercentageOfNotionalLandCapitalAccount" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_OverlookRidgeTwoCThreeBsInterestInOverlookRidgeApartmentsInvestorsMember" name="OverlookRidgeTwoCThreeBsInterestInOverlookRidgeApartmentsInvestorsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_OverlookRidgeApartmentsInvestorsLLCMember" name="OverlookRidgeApartmentsInvestorsLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_OverlookTwoCThreeBProjectMember" name="OverlookTwoCThreeBProjectMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PercentageOfCapitalEventCashFlowsDistributed" name="PercentageOfCapitalEventCashFlowsDistributed" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ConstructionLoanMember" name="ConstructionLoanMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ConstructionLoanExtensionNumberOneMember" name="ConstructionLoanExtensionNumberOneMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ConstructionLoanExtensionNumberTwoMember" name="ConstructionLoanExtensionNumberTwoMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ThresholdOfPaymentGuaranteeTerminationDebtServiceCoverageRatio" name="ThresholdOfPaymentGuaranteeTerminationDebtServiceCoverageRatio" nillable="true" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_PercentageReturnOnUnrecoveredCapital" name="PercentageReturnOnUnrecoveredCapital" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_UnrecoveredPartnersNotionalCapitalBalance" name="UnrecoveredPartnersNotionalCapitalBalance" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="cli_PortImperialNorthRetailLLCMember" name="PortImperialNorthRetailLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_RiverwalkPropertyMember" name="RiverwalkPropertyMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PRIIPortImperialRetailLLCMember" name="PRIIPortImperialRetailLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_DebtInstrumentNumberOfExtensionOptions" name="DebtInstrumentNumberOfExtensionOptions" nillable="true" type="xbrli:positiveIntegerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_DebtInstrumentExtensionPeriod" name="DebtInstrumentExtensionPeriod" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_DebtInstrumentExtensionFeePercentage" name="DebtInstrumentExtensionFeePercentage" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_BNESAssociatesIIIsInterestInOfficesAtCrystalLakeMember" name="BNESAssociatesIIIsInterestInOfficesAtCrystalLakeMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_OfficesAtCrystalLakeLLCMember" name="OfficesAtCrystalLakeLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PortsideMasterCompanysInterestInPortsideApartmentHoldingsMember" name="PortsideMasterCompanysInterestInPortsideApartmentHoldingsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PortsideAtPierOneBuildingSevenPropertyMember" name="PortsideAtPierOneBuildingSevenPropertyMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PRIIPortsideInvestorsLLCMember" name="PRIIPortsideInvestorsLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PortsideApartmentHoldingsLLCMember" name="PortsideApartmentHoldingsLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PercentageOfDebtGuaranteedByCompany" name="PercentageOfDebtGuaranteedByCompany" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_PercentageOfDebtGuaranteedByCompanyAfterProjectCompletion" name="PercentageOfDebtGuaranteedByCompanyAfterProjectCompletion" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_PercentageOfDebtGuaranteedByCompanyAfterDebtServiceCoverageRatioThresholdReached" name="PercentageOfDebtGuaranteedByCompanyAfterDebtServiceCoverageRatioThresholdReached" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_PortImperialThirteenMember" name="PortImperialThirteenMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PRIIPortImperialSouthThirteenInvestorLLCMember" name="PRIIPortImperialSouthThirteenInvestorLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_AmountOfDebtGuaranteedByCompanyAfterDebtServiceCoverageRatioThresholdReached" name="AmountOfDebtGuaranteedByCompanyAfterDebtServiceCoverageRatioThresholdReached" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="cli_DebtServiceCoverageRatioAxis" name="DebtServiceCoverageRatioAxis" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" xbrli:periodType="duration" />
  <element id="cli_DebtServiceCoverageRatioDomain" name="DebtServiceCoverageRatioDomain" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_DebtServiceCoverageRatioOneMember" name="DebtServiceCoverageRatioOneMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_DebtServiceCoverageRatioTwoMember" name="DebtServiceCoverageRatioTwoMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ThresholdOfPaymentGuaranteeReductionDebtServiceCoverageRatio" name="ThresholdOfPaymentGuaranteeReductionDebtServiceCoverageRatio" nillable="true" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_PercentageOfReturnOnAdditionalCapitalContributions" name="PercentageOfReturnOnAdditionalCapitalContributions" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PrudentialPortImperialLLCMember" name="PrudentialPortImperialLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PrudentialAndPrudentialPortImperialLLCMember" name="PrudentialAndPrudentialPortImperialLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_RoseGardenMarbellaSouthsInterestInPruRoseMarbellaIIMember" name="RoseGardenMarbellaSouthsInterestInPruRoseMarbellaIIMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PruRoseMarbellaIILLCMember" name="PruRoseMarbellaIILLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PruRoseRiverwalkGsInterestInRiverwalkGUrbanRenewalMember" name="PruRoseRiverwalkGsInterestInRiverwalkGUrbanRenewalMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_RiverTraceProjectMember" name="RiverTraceProjectMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_WestNewYorkParcelGApartmentsInvestorsLLCMember" name="WestNewYorkParcelGApartmentsInvestorsLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_AmountOfCompanysInitialDistributionsToBeRedirected" name="AmountOfCompanysInitialDistributionsToBeRedirected" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cli_PeriodOfLoanGuaranteeByCompanyFollowingCompletionOfProject" name="PeriodOfLoanGuaranteeByCompanyFollowingCompletionOfProject" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_LincolnHarborProjectBuildingaMember" name="LincolnHarborProjectBuildingaMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_LincolnHarborProjectBuildingCMember" name="LincolnHarborProjectBuildingCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_LincolnHarborProjectMember" name="LincolnHarborProjectMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ElmajoManagementIncMember" name="ElmajoManagementIncMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PercentageOfCapitalRequiredToFundProject" name="PercentageOfCapitalRequiredToFundProject" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_RiverparkProjectMember" name="RiverparkProjectMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ChallEnterprisesLLCMember" name="ChallEnterprisesLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_InvestorGroupMember" name="InvestorGroupMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_VariableInterestEntityEntityEstimatedFutureFundingCommitments" name="VariableInterestEntityEntityEstimatedFutureFundingCommitments" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="cli_PortImperialFourAndFiveGarageDevelopmentMember" name="PortImperialFourAndFiveGarageDevelopmentMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PeriodOfRealEstateTaxesPhaseIn" name="PeriodOfRealEstateTaxesPhaseIn" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_NumberOfVariableInterestEntities" name="NumberOfVariableInterestEntities" nillable="true" type="xbrli:positiveIntegerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_PortImperialSouthMember" name="PortImperialSouthMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PortImperialSouthFourAndFiveMember" name="PortImperialSouthFourAndFiveMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PercentageOfOperatingReturnOnCapital" name="PercentageOfOperatingReturnOnCapital" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_OverlookRidgeApartmentsMemberLLCMember" name="OverlookRidgeApartmentsMemberLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ResidualOwnershipInterest" name="ResidualOwnershipInterest" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_ConsolidatedJointVenturesRealEstateAssets" name="ConsolidatedJointVenturesRealEstateAssets" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="cli_ConsolidatedJointVenturesMortgages" name="ConsolidatedJointVenturesMortgages" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="cli_ConsolidatedJointVenturesOtherLiabilites" name="ConsolidatedJointVenturesOtherLiabilites" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="cli_DevelopmentManagementAndOtherServicesFees" name="DevelopmentManagementAndOtherServicesFees" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cli_AmountToFund" name="AmountToFund" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="cli_PercentageOfCapitalEventCashFlowsDistributedAfterInitialInternalRateOfReturnReached" name="PercentageOfCapitalEventCashFlowsDistributedAfterInitialInternalRateOfReturnReached" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_InitialInternalRateOfReturn" name="InitialInternalRateOfReturn" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_RiverwalkGUrbanRenewalLLCMember" name="RiverwalkGUrbanRenewalLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_LincolnHarborProjectBuildingsAandCMember" name="LincolnHarborProjectBuildingsAandCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_CrystalHouseApartmentsInvestorsLLCMember" name="CrystalHouseApartmentsInvestorsLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_NumberOfUnitsAvailableForDevelopment" name="NumberOfUnitsAvailableForDevelopment" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_NumberOfApprovedUnitsAvailableForDevelopment" name="NumberOfApprovedUnitsAvailableForDevelopment" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_UBSGlobalAssetManagementMember" name="UBSGlobalAssetManagementMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_MortgageLoanInitialTermOfInterestOnlyPayments" name="MortgageLoanInitialTermOfInterestOnlyPayments" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ParcelCMember" name="ParcelCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_HarborsideFinancialCenterPlazaFouraMember" name="HarborsideFinancialCenterPlazaFouraMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_HarborsideFinancialCenterPlazaFiveMember" name="HarborsideFinancialCenterPlazaFiveMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_LincolnHarborProjectBuildingBMember" name="LincolnHarborProjectBuildingBMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_AggregateCapitalCredits" name="AggregateCapitalCredits" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="cli_DeferredRetirementCompensationUnitsMember" name="DeferredRetirementCompensationUnitsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_MaterialAdjustmentAmount" name="MaterialAdjustmentAmount" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cli_ProjectCostsRequiredFundingAmount" name="ProjectCostsRequiredFundingAmount" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cli_RoselandPartnersLLCMember" name="RoselandPartnersLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_RoselandAssetsMember" name="RoselandAssetsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_CompletionOfCertainDevelopmentsMember" name="CompletionOfCertainDevelopmentsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_StartOfConstructionOnCertainDevelopmentsMember" name="StartOfConstructionOnCertainDevelopmentsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ObtainingOfTaxCreditsGrantsMember" name="ObtainingOfTaxCreditsGrantsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_TotalReturnToShareholdersMember" name="TotalReturnToShareholdersMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_BusinessAcquisitionContingentConsiderationCashPaid" name="BusinessAcquisitionContingentConsiderationCashPaid" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cli_FailureToAchieveCertainLevelOfFeeRevenueMember" name="FailureToAchieveCertainLevelOfFeeRevenueMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PercentageOfInterestInDevelopableLand" name="PercentageOfInterestInDevelopableLand" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_SeniorUnsecuredNotesTextBlock" name="SeniorUnsecuredNotesTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_DifferenceBetweenOtherComprehensiveIncomeAndNetIncomeLoss" name="DifferenceBetweenOtherComprehensiveIncomeAndNetIncomeLoss" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cli_SegmentReportingInformationNetOperatingIncomeLossForReportableSegment" name="SegmentReportingInformationNetOperatingIncomeLossForReportableSegment" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cli_OperatingAgreementAmountOfUnrecoveredCapitalToDetermineCashFlowDistribution" name="OperatingAgreementAmountOfUnrecoveredCapitalToDetermineCashFlowDistribution" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="cli_MultipleFamilyPropertiesMember" name="MultipleFamilyPropertiesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_CostsOfRealEstateServices" name="CostsOfRealEstateServices" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cli_DistributionOfLoanProceeds" name="DistributionOfLoanProceeds" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cli_ShareOfDistributionOfLoanProceeds" name="ShareOfDistributionOfLoanProceeds" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cli_PercentageOfDebtGuaranteedByCompanyAfterProjectCompletionAndAchievementOfFinancialRatios" name="PercentageOfDebtGuaranteedByCompanyAfterProjectCompletionAndAchievementOfFinancialRatios" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_ThresholdOfPaymentGuaranteeDebtServiceCoverageRatio" name="ThresholdOfPaymentGuaranteeDebtServiceCoverageRatio" nillable="true" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_ThresholdOfPaymentGuaranteeLoanToValueRatio" name="ThresholdOfPaymentGuaranteeLoanToValueRatio" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_ThreePointOneFiveZeroPercentSeniorUnsecuredNotesDueMayFifteenthTwoThousandTwentyThreeMember" name="ThreePointOneFiveZeroPercentSeniorUnsecuredNotesDueMayFifteenthTwoThousandTwentyThreeMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_BusinessAcquisitionAcquireeAmountOfEscrowReleased" name="BusinessAcquisitionAcquireeAmountOfEscrowReleased" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cli_TwoThousandThirteenIncentiveStockPlanMember" name="TwoThousandThirteenIncentiveStockPlanMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_DiscontinuedOperationRealEstateSalePrice" name="DiscontinuedOperationRealEstateSalePrice" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="cli_MortgageLoanMaturityDate" name="MortgageLoanMaturityDate" nillable="true" type="invest:dateStringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_EstuaryUrbanRenewalUnitBLLCMember" name="EstuaryUrbanRenewalUnitBLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ElmajoUrbanRenewalAssociatesLLCAndEstuaryUrbanRenewalAssociatesLLCMember" name="ElmajoUrbanRenewalAssociatesLLCAndEstuaryUrbanRenewalAssociatesLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_NumberOfBuildingsOnPropertiesSold" name="NumberOfBuildingsOnPropertiesSold" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_AreaOfRealEstatePropertySold" name="AreaOfRealEstatePropertySold" nillable="true" type="num:areaItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_AreaOfRealEstatePropertyHeldForSale" name="AreaOfRealEstatePropertyHeldForSale" nillable="true" type="num:areaItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_CreditRatingMoodysAndStandardAndPoorsAxis" name="CreditRatingMoodysAndStandardAndPoorsAxis" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" xbrli:periodType="duration" />
  <element id="cli_CreditRatingMoodysAndStandardPoorsDomain" name="CreditRatingMoodysAndStandardPoorsDomain" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_MackCaliRealtyCorporationStockholdersEquityLineItems" name="MackCaliRealtyCorporationStockholdersEquityLineItems" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="cli_OtherJointVenturesMember" name="OtherJointVenturesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ShopsAtFortyParkPropertyMember" name="ShopsAtFortyParkPropertyMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_MortgageLoanOnRealEstateAdditionalBorrowingCapacity" name="MortgageLoanOnRealEstateAdditionalBorrowingCapacity" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="cli_RealEstateCommercialAndOtherSegmentMember" name="RealEstateCommercialAndOtherSegmentMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_RealEstateMultipleFamilySegmentMember" name="RealEstateMultipleFamilySegmentMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_MultipleFamilyServicesSegmentMember" name="MultipleFamilyServicesSegmentMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_TwoHundredThirtyThreeCanoeBrookRoadMember" name="TwoHundredThirtyThreeCanoeBrookRoadMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_UnconsolidatedJointVentureOfficeAndRetailBuildingsMember" name="UnconsolidatedJointVentureOfficeAndRetailBuildingsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_NumberOfLandParcelsSold" name="NumberOfLandParcelsSold" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_RefinanceLoanMember" name="RefinanceLoanMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_TwentyTwoSylvanWayMember" name="TwentyTwoSylvanWayMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ParkSquareMember" name="ParkSquareMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_KpgPOneHundredImwJvLlcMember" name="KpgPOneHundredImwJvLlcMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_KpgImwOwnerLlcMember" name="KpgImwOwnerLlcMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_OneHundredImwPropertyMember" name="OneHundredImwPropertyMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_AreaOfRealEstatePropertyConversion" name="AreaOfRealEstatePropertyConversion" nillable="true" type="num:areaItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_KpgMcgImwLlcMember" name="KpgMcgImwLlcMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_KpgMcgsInterestInKpgPMember" name="KpgMcgsInterestInKpgPMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_KpgsInterestInKpgPMember" name="KpgsInterestInKpgPMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ParkwaysInterestInKpgPMember" name="ParkwaysInterestInKpgPMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_KpgPMember" name="KpgPMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ThresholdOfMemberUnreturnedCapitalForDistributionOfNetOperatingCashFlows" name="ThresholdOfMemberUnreturnedCapitalForDistributionOfNetOperatingCashFlows" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="cli_ThresholdOfMemberUnreturnedCapitalForDistributionOfCapitalEventCashFlows" name="ThresholdOfMemberUnreturnedCapitalForDistributionOfCapitalEventCashFlows" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="cli_ThresholdOfMemberDeferredUnreturnedCapitalForDistributionOfCapitalEventCashFlows" name="ThresholdOfMemberDeferredUnreturnedCapitalForDistributionOfCapitalEventCashFlows" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="cli_CapitolPlaceMezzLlcMember" name="CapitolPlaceMezzLlcMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_FbCapitolPlaceLlcMember" name="FbCapitolPlaceLlcMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_WdcProjectMember" name="WdcProjectMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_NumberOfTenants" name="NumberOfTenants" nillable="true" type="xbrli:positiveIntegerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_InterestFreeNotesReceivableMember" name="InterestFreeNotesReceivableMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_MortgageLoansOnRealEstateBasisSpreadOverVariableInterestRate" name="MortgageLoansOnRealEstateBasisSpreadOverVariableInterestRate" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_DebtInstrumentCovenantComplianceLeverageRatio" name="DebtInstrumentCovenantComplianceLeverageRatio" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_DebtInstrumentCovenantComplianceSecuredIndebtedness" name="DebtInstrumentCovenantComplianceSecuredIndebtedness" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_DebtInstrumentCovenantComplianceFixedChargeCoverage" name="DebtInstrumentCovenantComplianceFixedChargeCoverage" nillable="true" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_DebtInstrumentCovenantComplianceUnsecuredIndebtedness" name="DebtInstrumentCovenantComplianceUnsecuredIndebtedness" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_DebtInstrumentCovenantComplianceUnencumberedPropertyInterestCoverage" name="DebtInstrumentCovenantComplianceUnencumberedPropertyInterestCoverage" nillable="true" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_DebtInstrumentCovenantComplianceInvestmentLimitationsAsPercentageOfTotalCapitalization" name="DebtInstrumentCovenantComplianceInvestmentLimitationsAsPercentageOfTotalCapitalization" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_NumberOfRealEstatePropertiesHeldForSale" name="NumberOfRealEstatePropertiesHeldForSale" nillable="true" type="xbrli:positiveIntegerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_PeriodOfPartialAbatementOfRealEstateTax" name="PeriodOfPartialAbatementOfRealEstateTax" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsUnvestedInPeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsUnvestedInPeriod" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_KeystoneAffiliatesMember" name="KeystoneAffiliatesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ParkingRetailMember" name="ParkingRetailMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_UnconsolidatedJointVentureParkingRetailBuildingsMember" name="UnconsolidatedJointVentureParkingRetailBuildingsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_AmortizationOfDeferredStockUnits" name="AmortizationOfDeferredStockUnits" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cli_ThresholdOfInvestmentValueForDiscontinuationOfEquityMethodAccounting" name="ThresholdOfInvestmentValueForDiscontinuationOfEquityMethodAccounting" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="cli_UnsecuredRevolvingCreditFacilityExtensionOneMember" name="UnsecuredRevolvingCreditFacilityExtensionOneMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_UnsecuredRevolvingCreditFacilityExtensionTwoMember" name="UnsecuredRevolvingCreditFacilityExtensionTwoMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PreviousUnsecuredRevolvingCreditFacilityMember" name="PreviousUnsecuredRevolvingCreditFacilityMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_LeasePeriod" name="LeasePeriod" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_DeferredChargesGoodwillAndOtherAssetsTable" name="DeferredChargesGoodwillAndOtherAssetsTable" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" xbrli:periodType="duration" />
  <element id="cli_DeferredChargesGoodwillAndOtherAssetsLineItems" name="DeferredChargesGoodwillAndOtherAssetsLineItems" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="cli_MgMarbellaPartnersIILLCMember" name="MgMarbellaPartnersIILLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_MonacoHoldingsLLCMember" name="MonacoHoldingsLLCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_KeystonePortfolioMember" name="KeystonePortfolioMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_PeriodForContinuationOfHealthInsurance" name="PeriodForContinuationOfHealthInsurance" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_NumberOfExecutiveOfficersWhoDeparted" name="NumberOfExecutiveOfficersWhoDeparted" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_DiscontinuedOperationRealEstateSalePriceCash" name="DiscontinuedOperationRealEstateSalePriceCash" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="cli_DiscontinuedOperationRealEstateSalePriceCapitalAccounts" name="DiscontinuedOperationRealEstateSalePriceCapitalAccounts" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" />
  <element id="cli_DiscontinuedOperationRealEstateSalePriceNumberOfPropertiesWithSeniorInterest" name="DiscontinuedOperationRealEstateSalePriceNumberOfPropertiesWithSeniorInterest" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
  <element id="cli_DiscontinuedOperationRealEstateSalePricePartnersCapitalInProepertiesInWhichSeniorInterestIsHeld" name="DiscontinuedOperationRealEstateSalePricePartnersCapitalInProepertiesInWhichSeniorInterestIsHeld" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="cli_DueDiligenceExtensionPeriod" name="DueDiligenceExtensionPeriod" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_AndoverPlaceMember" name="AndoverPlaceMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_SummaryOfIncomeFromPropertyHeldForSaleTableTextBlock" name="SummaryOfIncomeFromPropertyHeldForSaleTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_RealEstatePropertyHeldForSaleRevenues" name="RealEstatePropertyHeldForSaleRevenues" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cli_RealEstatePropertyHeldForSaleOperatingExpenses" name="RealEstatePropertyHeldForSaleOperatingExpenses" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cli_RealEstatePropertyHeldForSaleDepreciationAndAmortization" name="RealEstatePropertyHeldForSaleDepreciationAndAmortization" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="cli_RealEstatePropertyHeldForSaleNetIncomeLoss" name="RealEstatePropertyHeldForSaleNetIncomeLoss" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="cli_LineOfCreditFacilityConstructionReserve" name="LineOfCreditFacilityConstructionReserve" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <element id="cli_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedAndVestedInPeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedAndVestedInPeriod" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_SignificantAccountingPoliciesTable" name="SignificantAccountingPoliciesTable" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" xbrli:periodType="duration" />
  <element id="cli_SignificantAccountingPoliciesLineItems" name="SignificantAccountingPoliciesLineItems" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <element id="cli_OneHundredFiftyMainStreetMember" name="OneHundredFiftyMainStreetMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_CompletionStartOfCertainDevelopmentsMember" name="CompletionStartOfCertainDevelopmentsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="cli_ProbabilityOfOccurrence" name="ProbabilityOfOccurrence" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" />
</schema>
