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  <xsd:element id="slg_PaymentsForProceedsFromOtherInvestments" name="PaymentsForProceedsFromOtherInvestments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="slg_PeriodFromCessationOfMajorConstructionActivityToCompletionOfConstructionProjectMaximum" name="PeriodFromCessationOfMajorConstructionActivityToCompletionOfConstructionProjectMaximum" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
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  <xsd:element abstract="true" id="slg_PreferredEquityInvestmentsInMortgageLoansMember" name="PreferredEquityInvestmentsInMortgageLoansMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_PreferredEquityJune2022Member" name="PreferredEquityJune2022Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
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  <xsd:element id="slg_PreferredStockDividendMultiplierRatioPerCommonUnitDistribution" name="PreferredStockDividendMultiplierRatioPerCommonUnitDistribution" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="duration" />
  <xsd:element id="slg_ProceedsFromNoncontrollingInterestsInOtherPartnerships" name="ProceedsFromNoncontrollingInterestsInOtherPartnerships" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="slg_ProceedsFromParticipatingMortgageLoan" name="ProceedsFromParticipatingMortgageLoan" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="slg_ProfitLossLessMinorityInterestInNetIncomeLossOperatingPartnerships" name="ProfitLossLessMinorityInterestInNetIncomeLossOperatingPartnerships" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
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  <xsd:element id="slg_PurchasePriceFairValueAdjustmentGainLoss" name="PurchasePriceFairValueAdjustmentGainLoss" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
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  <xsd:element abstract="true" id="slg_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionAbstract" name="RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="slg_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionOfBuildingAndImprovements" name="RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionOfBuildingAndImprovements" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="slg_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionOfLand" name="RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionOfLand" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
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  <xsd:element id="slg_ReallocationofNoncontrollingInteresttofromOperatingPartnership" name="ReallocationofNoncontrollingInteresttofromOperatingPartnership" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="slg_RedemptionOfUnitsInOperatingPartnershipForSaleOfJointVenture" name="RedemptionOfUnitsInOperatingPartnershipForSaleOfJointVenture" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
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  <xsd:element id="slg_RepaymentsOrRedemptionOfDebtAndPreferredEquityInvestments" name="RepaymentsOrRedemptionOfDebtAndPreferredEquityInvestments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_RestrictedStockAwardsMember" name="RestrictedStockAwardsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
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  <xsd:element abstract="true" id="slg_RightOfUseAssetsFinancingLeaseMember" name="RightOfUseAssetsFinancingLeaseMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_RollforwardAnalysisofPreferredUnitActivityRollForward" name="RollforwardAnalysisofPreferredUnitActivityRollForward" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="slg_SECSchedule1229RealEstateCompaniesInvestmentInMortgageLoansOnRealEstateLoanLossReservePeriodIncreaseDecrease" name="SECSchedule1229RealEstateCompaniesInvestmentInMortgageLoansOnRealEstateLoanLossReservePeriodIncreaseDecrease" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
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  <xsd:element id="slg_ScheduleOfAcquiredAboveMarketAndBelowMarketLeasesFutureAmortizationExpenseTableTextBlock" name="ScheduleOfAcquiredAboveMarketAndBelowMarketLeasesFutureAmortizationExpenseTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="slg_ScheduleOfDebtAndPreferredEquityBookBalanceRollForwardTableTextBlock" name="ScheduleOfDebtAndPreferredEquityBookBalanceRollForwardTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
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  <xsd:element id="slg_ScheduleOfFutureMinimumRentsReceivableForOperatingLeasesTableTextBlock" name="ScheduleOfFutureMinimumRentsReceivableForOperatingLeasesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
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  <xsd:element id="slg_ScheduleOfIntangibleAssetsAndLiabilitiesTableTextBlock" name="ScheduleOfIntangibleAssetsAndLiabilitiesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="slg_ScheduleOfMortgageAndOtherLoansPayableOnJointVenturePropertiesTableTextBlock" name="ScheduleOfMortgageAndOtherLoansPayableOnJointVenturePropertiesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="slg_ScheduleOfOtherIdentifiableAssetsFutureAmortizationExpenseTableTextBlock" name="ScheduleOfOtherIdentifiableAssetsFutureAmortizationExpenseTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_ScheduleOfOwnershipInterestsTable" name="ScheduleOfOwnershipInterestsTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="slg_ScheduleofCalculationofNumeratorandDenominatorinEarningsPerUnitTableTextBlock" name="ScheduleofCalculationofNumeratorandDenominatorinEarningsPerUnitTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="slg_ScheduleofCommonStockIssuedandProceedsReceivedDividendReinvestmentsTableTextBlock" name="ScheduleofCommonStockIssuedandProceedsReceivedDividendReinvestmentsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="slg_SecuredDebtAndOtherLoansPayable" name="SecuredDebtAndOtherLoansPayable" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="slg_SecuredDebtBearingFixedInterestAmount" name="SecuredDebtBearingFixedInterestAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="slg_SecuredDebtBearingFixedInterestMortgageAmount" name="SecuredDebtBearingFixedInterestMortgageAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="slg_SecuredDebtBearingFixedInterestSubordinateLoanAmount" name="SecuredDebtBearingFixedInterestSubordinateLoanAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="slg_SecuredDebtBearingVariableInterestAmount" name="SecuredDebtBearingVariableInterestAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="slg_SecuredDebtGross" name="SecuredDebtGross" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="slg_SecuredDebtInitialMaturityAugust2019Member" name="SecuredDebtInitialMaturityAugust2019Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_SecuredDebtInitialMaturityJune2024Member" name="SecuredDebtInitialMaturityJune2024Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="slg_SecuredDebtandOtherLoansPayableNet" name="SecuredDebtandOtherLoansPayableNet" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="slg_SeniorMortgageMember" name="SeniorMortgageMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="slg_SeniorNotesNetofDeferredFinanceCosts" name="SeniorNotesNetofDeferredFinanceCosts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="slg_SeniorUnsecuredBondsMember" name="SeniorUnsecuredBondsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_SeniorUnsecuredNoteDueDecember172025Member" name="SeniorUnsecuredNoteDueDecember172025Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_SeniorUnsecuredNotesDueAugust2021Member" name="SeniorUnsecuredNotesDueAugust2021Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_SeniorUnsecuredNotesDueDecember12022Member" name="SeniorUnsecuredNotesDueDecember12022Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_SeniorUnsecuredNotesDueMarch152020Member" name="SeniorUnsecuredNotesDueMarch152020Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
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  <xsd:element abstract="true" id="slg_SevenOneNineSeventhAvenueMember" name="SevenOneNineSeventhAvenueMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_SeventhAvenue810Member" name="SeventhAvenue810Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="slg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRateHighEndOfRange" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRateHighEndOfRange" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="slg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRateLowEndOfRange" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRateLowEndOfRange" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="slg_ShareBasedCompensationArrangementByShareBasedPaymentAwardDurationOfOfferingPeriods" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardDurationOfOfferingPeriods" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="slg_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsInPeriodFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsInPeriodFairValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="slg_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumAwardToBeEarnedIfPerformanceReachesMaximumThresholdFirstPerformancePeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumAwardToBeEarnedIfPerformanceReachesMaximumThresholdFirstPerformancePeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="instant" />
  <xsd:element id="slg_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumAwardToBeEarnedIfPerformanceReachesMaximumThresholdSecondPerformancePeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumAwardToBeEarnedIfPerformanceReachesMaximumThresholdSecondPerformancePeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="instant" />
  <xsd:element id="slg_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesToBeIssuedIfEqualToFungibleUnits" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesToBeIssuedIfEqualToFungibleUnits" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element id="slg_ShareBasedCompensationArrangementByShareBasedPaymentAwardPeriodOfAwardVestingCommencement" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPeriodOfAwardVestingCommencement" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="slg_ShareBasedCompensationArrangementbyShareBasedPaymentAwardFungibleUnitsPerShare" name="ShareBasedCompensationArrangementbyShareBasedPaymentAwardFungibleUnitsPerShare" nillable="true" substitutionGroup="xbrli:item" type="xbrli:decimalItemType" xbrli:periodType="instant" />
  <xsd:element id="slg_ShareBasedCompensationArrangementbyShareBasedPaymentAwardNumberofFungibleUnitsAuthorized" name="ShareBasedCompensationArrangementbyShareBasedPaymentAwardNumberofFungibleUnitsAuthorized" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="slg_ShareBasedCompensationArrangementbyShareBasedPaymentAwardPreferredUnitDistributionsasaPercentageofCommonUnitDistributions" name="ShareBasedCompensationArrangementbyShareBasedPaymentAwardPreferredUnitDistributionsasaPercentageofCommonUnitDistributions" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="slg_ShareRepurchaseProgramNumberOfIncreasesToShareRepurchaseProgram" name="ShareRepurchaseProgramNumberOfIncreasesToShareRepurchaseProgram" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="slg_ShareRepurchasesPayable" name="ShareRepurchasesPayable" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="slg_SharebasedCompensationArrangementBySharebasedPaymentAwardNumberOfFungibleUnitsAvailableForGrant" name="SharebasedCompensationArrangementBySharebasedPaymentAwardNumberOfFungibleUnitsAvailableForGrant" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="slg_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsWeightedAverageExercisePriceRollForward" name="SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsWeightedAverageExercisePriceRollForward" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="slg_SharebasedCompensationArrangementbySharebasedPaymentAwardStockAppreciationPeriod" name="SharebasedCompensationArrangementbySharebasedPaymentAwardStockAppreciationPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_SharebasedCompensationAwardTrancheFourMember" name="SharebasedCompensationAwardTrancheFourMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_SixthAvenue635Member" name="SixthAvenue635Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_SixthAvenue641Member" name="SixthAvenue641Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_SpringStreet115Member" name="SpringStreet115Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_SpringStreet131To137Member" name="SpringStreet131To137Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_StevensAvenue115To117Member" name="StevensAvenue115To117Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_StockOptionsStockAppreciationRightsAndOtherAwardsMember" name="StockOptionsStockAppreciationRightsAndOtherAwardsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="slg_StockRepurchaseProgramAuthorizedAmountTotal" name="StockRepurchaseProgramAuthorizedAmountTotal" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="slg_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestInOtherPartnershipAbstract" name="StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestInOtherPartnershipAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_StockholdersEquityLineItems" name="StockholdersEquityLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_StockholdersEquityTable" name="StockholdersEquityTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_StonehengePortfolioMember" name="StonehengePortfolioMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_StonehengePropertiesMember" name="StonehengePropertiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_StructuredFinanceSegmentMember" name="StructuredFinanceSegmentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_SuburbanMember" name="SuburbanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_SummitLakeDrive400Member" name="SummitLakeDrive400Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_Tenant1Member" name="Tenant1Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_TermLoanAMaturityMarch312023Member" name="TermLoanAMaturityMarch312023Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_TermLoanBMaturityNovember212024Member" name="TermLoanBMaturityNovember212024Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_TermLoanMember" name="TermLoanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_ThirdAmendmentandRestated2005StockOptionandIncentivePlanMember" name="ThirdAmendmentandRestated2005StockOptionandIncentivePlanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_ThirdAvenue711Member" name="ThirdAvenue711Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_ThirdAvenue750Member" name="ThirdAvenue750Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_ThirdAvenue800Member" name="ThirdAvenue800Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_ThirdAvenue919Member" name="ThirdAvenue919Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_ThirdStreet175225Member" name="ThirdStreet175225Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_ThreeResidentialUnitsMember" name="ThreeResidentialUnitsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_ThreeRetailandTwoResidentialUnitsMember" name="ThreeRetailandTwoResidentialUnitsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_TiconderogaInsuranceCompanyMember" name="TiconderogaInsuranceCompanyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="slg_TotalCostsAndExpensesIncludingNonoperatingIncomeExpense" name="TotalCostsAndExpensesIncludingNonoperatingIncomeExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="slg_TotalParOrStatedValuePerShare" name="TotalParOrStatedValuePerShare" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="instant" />
  <xsd:element id="slg_TotalSharesAuthorized" name="TotalSharesAuthorized" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element id="slg_TransactionCostsPolicyTextBlock" name="TransactionCostsPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="slg_TransferToLiabilitiesRelatedToNetAssetsHeldForSale" name="TransferToLiabilitiesRelatedToNetAssetsHeldForSale" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="slg_TransferToNetAssetsHeldForSale" name="TransferToNetAssetsHeldForSale" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_UncommittedMasterRepurchaseAgreement2017Member" name="UncommittedMasterRepurchaseAgreement2017Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="slg_UnderwritingCommissionsandCostsPolicyPolicyTextBlock" name="UnderwritingCommissionsandCostsPolicyPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_UpperEastSideAssemblageMember" name="UpperEastSideAssemblageMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_UpperEastSideResidentialMember" name="UpperEastSideResidentialMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_W57Street555Member" name="W57Street555Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_WashingtonBoulevard1010Member" name="WashingtonBoulevard1010Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_WashingtonBoulevard1055Member" name="WashingtonBoulevard1055Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="slg_WeightedAverageAmortizationPeriodAboveMarketLeaseCosts" name="WeightedAverageAmortizationPeriodAboveMarketLeaseCosts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="slg_WeightedAverageAmortizationPeriodBelowMarketLeaseCosts" name="WeightedAverageAmortizationPeriodBelowMarketLeaseCosts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="slg_WeightedAverageAmortizationPeriodInPlaceLeaseCosts" name="WeightedAverageAmortizationPeriodInPlaceLeaseCosts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_West11Street34Member" name="West11Street34Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_West46thStreet55Member" name="West46thStreet55Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_WhitePlainsRoad520Member" name="WhitePlainsRoad520Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_WilliamsburgMember" name="WilliamsburgMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_WorkforceSubjectToCollectiveBargainingArrangementsExpiringWithinTwoYearsMember" name="WorkforceSubjectToCollectiveBargainingArrangementsExpiringWithinTwoYearsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="slg_WorldwidePlazaMember" name="WorldwidePlazaMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
</xsd:schema>
