<?xml version="1.0" encoding="us-ascii"?><InstanceReport xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><Version>2.4.0.8</Version><ReportLongName>30903 - Disclosure - Unsecured Revolving Credit Facility (Tables)</ReportLongName><DisplayLabelColumn>true</DisplayLabelColumn><ShowElementNames>false</ShowElementNames><RoundingOption /><HasEmbeddedReports>false</HasEmbeddedReports><Columns><Column FlagID="0"><Id>1</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><CurrencyCode /><FootnoteIndexer /><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol /><contextRef><ContextID>Duration_1_1_2013_To_6_30_2013</ContextID><EntitySchema>http://www.sec.gov/CIK</EntitySchema><EntityValue>0000924901</EntityValue><PeriodDisplayName /><PeriodType>duration</PeriodType><PeriodStartDate>2013-01-01T00:00:00</PeriodStartDate><PeriodEndDate>2013-06-30T00:00:00</PeriodEndDate><Segments /><Scenarios /></contextRef><UPS /><CurrencyCode /><OriginalCurrencyCode /></MCU><CurrencySymbol /><Labels><Label Key="CalendarSupplement" Id="0" Label="6 Months Ended" /><Label Key="Calendar" Id="1" Label="Jun. 30, 2013" /></Labels></Column></Columns><Rows><Row FlagID="0"><Id>1</Id><IsAbstractGroupTitle>true</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><Level>1</Level><ElementName>us-gaap_DebtDisclosureAbstract</ElementName><ElementPrefix>us-gaap_</ElementPrefix><IsBaseElement>true</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText /><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>xbrli:stringItemType</ElementDataType><SimpleDataType>string</SimpleDataType><IsTotalLabel>false</IsTotalLabel><UnitID>0</UnitID><Label>Debt Disclosure [Abstract]</Label></Row><Row FlagID="0"><Id>2</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><Level>2</Level><ElementName>cli_ScheduleOfUnsecuredCreditRatingOperatingPartnershipsTableTextBlock</ElementName><ElementPrefix>cli_</ElementPrefix><IsBaseElement>false</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><PreferredLabelRole>terseLabel</PreferredLabelRole><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="Duration_1_1_2013_To_6_30_2013" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText>&lt;div&gt; &lt;div style="margin-left:0pt;margin-right:0pt;"&gt;
		&lt;div style="width:100%"&gt;&lt;table cellpadding="0" cellspacing="0" style="border-collapse:collapse;margin-left:0pt;"&gt;
			&lt;tr&gt;
				&lt;td valign="top" style="width:261.90pt;height:16pt;padding:0pt 6.5pt;"&gt;
					&lt;p style="margin:0pt;font-family:Times New Roman;font-size: 10pt"&gt;
						&lt;font style="display: inline;font-weight:bold;font-size:10pt;"&gt;Operating Partnership&amp;#x2019;s &lt;/font&gt;&lt;/p&gt;
				&lt;/td&gt;
				&lt;td valign="top" style="width:130.50pt;height:16pt;padding:0pt 6.5pt;"&gt;
					&lt;p style="margin:0pt 17.1pt 0pt 0pt;text-align:right;font-family:Times New Roman;font-size: 10pt"&gt;
						&lt;font style="display: inline;font-weight:bold;font-size:10pt;"&gt;Interest Rate &amp;#x2013; &lt;/font&gt;&lt;/p&gt;
				&lt;/td&gt;
				&lt;td valign="top" style="width:86.40pt;height:16pt;padding:0pt 6.5pt;"&gt;
					&lt;p style="margin:0pt 4.5pt 0pt 0pt;text-align:right;font-family:Times New Roman;font-size: 12pt"&gt;
						&amp;nbsp;&lt;/p&gt;
				&lt;/td&gt;
			&lt;/tr&gt;
			&lt;tr&gt;
				&lt;td valign="top" style="width:261.90pt;padding:0pt 6.5pt;"&gt;
					&lt;p style="margin:0pt;font-family:Times New Roman;font-size: 10pt"&gt;
						&lt;font style="display: inline;font-weight:bold;font-size:10pt;"&gt;Unsecured Debt Ratings:&lt;/font&gt;&lt;/p&gt;
				&lt;/td&gt;
				&lt;td valign="top" style="width:130.50pt;padding:0pt 6.5pt;"&gt;
					&lt;p style="margin:0pt 12.6pt 0pt 0pt;text-align:right;font-family:Times New Roman;font-size: 10pt"&gt;
						&lt;font style="display: inline;font-weight:bold;font-size:10pt;"&gt;Applicable Basis Points&lt;/font&gt;&lt;/p&gt;
				&lt;/td&gt;
				&lt;td valign="top" style="width:86.40pt;padding:0pt 6.5pt;"&gt;
					&lt;p style="margin:0pt 9pt 0pt 0pt;text-align:right;font-family:Times New Roman;font-size: 10pt"&gt;
						&lt;font style="display: inline;font-weight:bold;font-size:10pt;"&gt;Facility Fee&lt;/font&gt;&lt;/p&gt;
				&lt;/td&gt;
			&lt;/tr&gt;
			&lt;tr&gt;
				&lt;td valign="top" style="width:261.90pt;border-bottom:1pt solid #000000 ;padding:0pt 6.5pt;"&gt;
					&lt;p style="margin:0pt;font-family:Times New Roman;font-size: 10pt"&gt;
						&lt;font style="display: inline;font-weight:bold;font-size:10pt;"&gt;Higher of S&amp;amp;P or Moody&amp;#x2019;s&lt;/font&gt;&lt;/p&gt;
				&lt;/td&gt;
				&lt;td valign="top" style="width:130.50pt;border-bottom:1pt solid #000000 ;padding:0pt 6.5pt;"&gt;
					&lt;p style="margin:0pt 12.6pt 0pt 0pt;text-align:right;font-family:Times New Roman;font-size: 10pt"&gt;
						&lt;font style="display: inline;font-weight:bold;font-size:10pt;"&gt;Above LIBOR&lt;/font&gt;&lt;/p&gt;
				&lt;/td&gt;
				&lt;td valign="top" style="width:86.40pt;border-bottom:1pt solid #000000 ;padding:0pt 6.5pt;"&gt;
					&lt;p style="margin:0pt 9pt 0pt 0pt;text-align:right;font-family:Times New Roman;font-size: 10pt"&gt;
						&lt;font style="display: inline;font-weight:bold;font-size:10pt;"&gt;Basis Points&lt;/font&gt;&lt;/p&gt;
				&lt;/td&gt;
			&lt;/tr&gt;
			&lt;tr&gt;
				&lt;td valign="top" style="width:261.90pt;padding:0pt 6.5pt;"&gt;
					&lt;p style="margin:0pt;font-family:Times New Roman;font-size: 10pt"&gt;
						&lt;font style="display: inline;font-size:10pt;"&gt;No ratings or less than BBB-/Baa3&lt;/font&gt;&lt;/p&gt;
				&lt;/td&gt;
				&lt;td valign="top" style="width:130.50pt;;font-family:Times New Roman;font-size:10pt;text-align:right;" nowrap="nowrap"&gt;&lt;div style="float:left"&gt;&lt;/div&gt;170.0&amp;nbsp;
				&lt;/td&gt;
				&lt;td valign="top" style="width:86.40pt;;font-family:Times New Roman;font-size:10pt;text-align:right;" nowrap="nowrap"&gt;&lt;div style="float:left"&gt;&lt;/div&gt;35.0&amp;nbsp;
				&lt;/td&gt;
			&lt;/tr&gt;
			&lt;tr&gt;
				&lt;td valign="top" style="width:261.90pt;padding:0pt 6.5pt;"&gt;
					&lt;p style="margin:0pt;font-family:Times New Roman;font-size: 10pt"&gt;
						&lt;font style="display: inline;font-size:10pt;"&gt;BBB- or Baa3&lt;/font&gt;&lt;/p&gt;
				&lt;/td&gt;
				&lt;td valign="top" style="width:130.50pt;;font-family:Times New Roman;font-size:10pt;text-align:right;" nowrap="nowrap"&gt;&lt;div style="float:left"&gt;&lt;/div&gt;130.0&amp;nbsp;
				&lt;/td&gt;
				&lt;td valign="top" style="width:86.40pt;;font-family:Times New Roman;font-size:10pt;text-align:right;" nowrap="nowrap"&gt;&lt;div style="float:left"&gt;&lt;/div&gt;30.0&amp;nbsp;
				&lt;/td&gt;
			&lt;/tr&gt;
			&lt;tr&gt;
				&lt;td valign="top" style="width:261.90pt;padding:0pt 6.5pt;"&gt;
					&lt;p style="margin:0pt;font-family:Times New Roman;font-size: 10pt"&gt;
						&lt;font style="display: inline;"&gt;BBB or Baa2(current)&lt;/font&gt;&lt;/p&gt;
				&lt;/td&gt;
				&lt;td valign="top" style="width:130.50pt;;font-family:Times New Roman;font-size:10pt;text-align:right;" nowrap="nowrap"&gt;&lt;div style="float:left"&gt;&lt;/div&gt;110.0&amp;nbsp;
				&lt;/td&gt;
				&lt;td valign="top" style="width:86.40pt;;font-family:Times New Roman;font-size:10pt;text-align:right;" nowrap="nowrap"&gt;&lt;div style="float:left"&gt;&lt;/div&gt;20.0&amp;nbsp;
				&lt;/td&gt;
			&lt;/tr&gt;
			&lt;tr&gt;
				&lt;td valign="top" style="width:261.90pt;padding:0pt 6.5pt;"&gt;
					&lt;p style="margin:0pt;font-family:Times New Roman;font-size: 10pt"&gt;
						&lt;font style="display: inline;"&gt;BBB+ or Baa1&lt;/font&gt;&lt;/p&gt;
				&lt;/td&gt;
				&lt;td valign="top" style="width:130.50pt;;font-family:Times New Roman;font-size:10pt;text-align:right;" nowrap="nowrap"&gt;&lt;div style="float:left"&gt;&lt;/div&gt;100.0&amp;nbsp;
				&lt;/td&gt;
				&lt;td valign="top" style="width:86.40pt;;font-family:Times New Roman;font-size:10pt;text-align:right;" nowrap="nowrap"&gt;&lt;div style="float:left"&gt;&lt;/div&gt;15.0&amp;nbsp;
				&lt;/td&gt;
			&lt;/tr&gt;
			&lt;tr&gt;
				&lt;td valign="top" style="width:261.90pt;padding:0pt 6.5pt;"&gt;
					&lt;p style="margin:0pt;font-family:Times New Roman;font-size: 10pt"&gt;
						&lt;font style="display: inline;font-size:10pt;"&gt;A- or A3 or higher&lt;/font&gt;&lt;/p&gt;
				&lt;/td&gt;
				&lt;td valign="top" style="width:130.50pt;;font-family:Times New Roman;font-size:10pt;text-align:right;" nowrap="nowrap"&gt;&lt;div style="float:left"&gt;&lt;/div&gt;92.5&amp;nbsp;
				&lt;/td&gt;
				&lt;td valign="top" style="width:86.40pt;;font-family:Times New Roman;font-size:10pt;text-align:right;" nowrap="nowrap"&gt;&lt;div style="float:left"&gt;&lt;/div&gt;12.5&amp;nbsp;
				&lt;/td&gt;
			&lt;/tr&gt;
		&lt;/table&gt;&lt;/div&gt;
		&lt;p style="margin:0pt;line-height:normal;font-family:Times New Roman;font-size: 12pt"&gt;
			&lt;font style="display: inline;"&gt;&amp;nbsp;&lt;/font&gt;
		&lt;/p&gt;
		&lt;p&gt;&lt;font size="1"&gt; &lt;/font&gt;&lt;/p&gt;
	&lt;/div&gt; &lt;/div&gt;</NonNumbericText><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>nonnum:textBlockItemType</ElementDataType><SimpleDataType>na</SimpleDataType><ElementDefenition>Schedule of Unsecured Credit Rating, Operating Partnerships [Table Text Block]</ElementDefenition><ElementReferences>No definition available.</ElementReferences><IsTotalLabel>false</IsTotalLabel><UnitID>0</UnitID><Label>Change In The Operating Partnership's Unsecured Debt Ratings</Label></Row></Rows><Footnotes /><IsEquityReport>false</IsEquityReport><ReportName>Unsecured Revolving Credit Facility (Tables)</ReportName><MonetaryRoundingLevel>UnKnown</MonetaryRoundingLevel><SharesRoundingLevel>UnKnown</SharesRoundingLevel><PerShareRoundingLevel>UnKnown</PerShareRoundingLevel><ExchangeRateRoundingLevel>UnKnown</ExchangeRateRoundingLevel><HasCustomUnits>true</HasCustomUnits><IsEmbedReport>false</IsEmbedReport><IsMultiCurrency>false</IsMultiCurrency><ReportType>Sheet</ReportType><RoleURI>http://www.mack-cali.com/role/DisclosureUnsecuredRevolvingCreditFacilityTables</RoleURI><NumberOfCols>1</NumberOfCols><NumberOfRows>2</NumberOfRows></InstanceReport>
