<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2023 Workiva-->
<!--r:dea2c0b0-bd3a-45a6-acea-99f3aa1bfc1a,g:b0f253d9-31d2-483c-8c0a-0432e94c17e5-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:slg="http://www.slgreen.com/20221231" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2020-01-21" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.slgreen.com/20221231">
  <xs:import namespace="http://fasb.org/srt/2022" schemaLocation="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2022" schemaLocation="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd"/>
  <xs:import namespace="http://www.w3.org/1999/xlink" schemaLocation="http://www.xbrl.org/2003/xlink-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2020-01-21" schemaLocation="https://www.xbrl.org/dtr/type/2020-01-21/types.xsd"/>
  <xs:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2022" schemaLocation="https://xbrl.sec.gov/dei/2022/dei-2022.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="slg-20221231_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="slg-20221231_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="slg-20221231_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="slg-20221231_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="CoverPage" roleURI="http://www.slgreen.com/role/CoverPage">
        <link:definition>0000001 - Document - Cover Page</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AuditInformation" roleURI="http://www.slgreen.com/role/AuditInformation">
        <link:definition>0000002 - Document - Audit Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedBalanceSheets" roleURI="http://www.slgreen.com/role/ConsolidatedBalanceSheets">
        <link:definition>0000003 - Statement - Consolidated Balance Sheets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedBalanceSheetsParenthetical" roleURI="http://www.slgreen.com/role/ConsolidatedBalanceSheetsParenthetical">
        <link:definition>0000004 - Statement - Consolidated Balance Sheets (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofOperations" roleURI="http://www.slgreen.com/role/ConsolidatedStatementsofOperations">
        <link:definition>0000005 - Statement - Consolidated Statements of Operations</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofOperationsParenthetical" roleURI="http://www.slgreen.com/role/ConsolidatedStatementsofOperationsParenthetical">
        <link:definition>0000006 - Statement - Consolidated Statements of Operations (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofComprehensiveIncome" roleURI="http://www.slgreen.com/role/ConsolidatedStatementsofComprehensiveIncome">
        <link:definition>0000007 - Statement - Consolidated Statements of Comprehensive Income</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementofEquity" roleURI="http://www.slgreen.com/role/ConsolidatedStatementofEquity">
        <link:definition>0000008 - Statement - Consolidated Statement of Equity</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementofEquityParenthetical" roleURI="http://www.slgreen.com/role/ConsolidatedStatementofEquityParenthetical">
        <link:definition>0000009 - Statement - Consolidated Statement of Equity (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofCashFlows" roleURI="http://www.slgreen.com/role/ConsolidatedStatementsofCashFlows">
        <link:definition>0000010 - Statement - Consolidated Statements of Cash Flows</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofCashFlowsParenthetical" roleURI="http://www.slgreen.com/role/ConsolidatedStatementsofCashFlowsParenthetical">
        <link:definition>0000011 - Statement - Consolidated Statements of Cash Flows (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedBalanceSheetsPartnership" roleURI="http://www.slgreen.com/role/ConsolidatedBalanceSheetsPartnership">
        <link:definition>0000012 - Statement - Consolidated Balance Sheets (Partnership)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedBalanceSheetsPartnershipParenthetical" roleURI="http://www.slgreen.com/role/ConsolidatedBalanceSheetsPartnershipParenthetical">
        <link:definition>0000013 - Statement - Consolidated Balance Sheets (Partnership) (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofOperationsPartnership" roleURI="http://www.slgreen.com/role/ConsolidatedStatementsofOperationsPartnership">
        <link:definition>0000014 - Statement - Consolidated Statements of Operations (Partnership)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofOperationsPartnershipParenthetical" roleURI="http://www.slgreen.com/role/ConsolidatedStatementsofOperationsPartnershipParenthetical">
        <link:definition>0000015 - Statement - Consolidated Statements of Operations (Partnership) (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofComprehensiveIncomePartnership" roleURI="http://www.slgreen.com/role/ConsolidatedStatementsofComprehensiveIncomePartnership">
        <link:definition>0000016 - Statement - Consolidated Statements of Comprehensive Income (Partnership)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementofCapital" roleURI="http://www.slgreen.com/role/ConsolidatedStatementofCapital">
        <link:definition>0000017 - Statement - Consolidated Statement of Capital</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementofCapitalParenthetical" roleURI="http://www.slgreen.com/role/ConsolidatedStatementofCapitalParenthetical">
        <link:definition>0000018 - Statement - Consolidated Statement of Capital (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofCashFlowsPartnership" roleURI="http://www.slgreen.com/role/ConsolidatedStatementsofCashFlowsPartnership">
        <link:definition>0000019 - Statement - Consolidated Statements of Cash Flows (Partnership)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofCashFlowsPartnershipParenthetical" roleURI="http://www.slgreen.com/role/ConsolidatedStatementsofCashFlowsPartnershipParenthetical">
        <link:definition>0000020 - Statement - Consolidated Statements of Cash Flows (Partnership) (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OrganizationandBasisofPresentation" roleURI="http://www.slgreen.com/role/OrganizationandBasisofPresentation">
        <link:definition>0000021 - Disclosure - Organization and Basis of Presentation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SignificantAccountingPolicies" roleURI="http://www.slgreen.com/role/SignificantAccountingPolicies">
        <link:definition>0000022 - Disclosure - Significant Accounting Policies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PropertyAcquisitions" roleURI="http://www.slgreen.com/role/PropertyAcquisitions">
        <link:definition>0000023 - Disclosure - Property Acquisitions</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PropertiesHeldforSaleandPropertyDispositions" roleURI="http://www.slgreen.com/role/PropertiesHeldforSaleandPropertyDispositions">
        <link:definition>0000024 - Disclosure - Properties Held for Sale and Property Dispositions</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtandPreferredEquityInvestments" roleURI="http://www.slgreen.com/role/DebtandPreferredEquityInvestments">
        <link:definition>0000025 - Disclosure - Debt and Preferred Equity Investments</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsinUnconsolidatedJointVentures" roleURI="http://www.slgreen.com/role/InvestmentsinUnconsolidatedJointVentures">
        <link:definition>0000026 - Disclosure - Investments in Unconsolidated Joint Ventures</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DeferredCosts" roleURI="http://www.slgreen.com/role/DeferredCosts">
        <link:definition>0000027 - Disclosure - Deferred Costs</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="MortgagesandOtherLoansPayable" roleURI="http://www.slgreen.com/role/MortgagesandOtherLoansPayable">
        <link:definition>0000028 - Disclosure - Mortgages and Other Loans Payable</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CorporateIndebtedness" roleURI="http://www.slgreen.com/role/CorporateIndebtedness">
        <link:definition>0000029 - Disclosure - Corporate Indebtedness</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RelatedPartyTransactions" roleURI="http://www.slgreen.com/role/RelatedPartyTransactions">
        <link:definition>0000030 - Disclosure - Related Party Transactions</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NoncontrollingInterestsontheCompanysConsolidatedFinancialStatements" roleURI="http://www.slgreen.com/role/NoncontrollingInterestsontheCompanysConsolidatedFinancialStatements">
        <link:definition>0000031 - Disclosure - Noncontrolling Interests on the Company's Consolidated Financial Statements</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockholdersEquityoftheCompany" roleURI="http://www.slgreen.com/role/StockholdersEquityoftheCompany">
        <link:definition>0000032 - Disclosure - Stockholders' Equity of the Company</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PartnersCapitaloftheOperatingPartnership" roleURI="http://www.slgreen.com/role/PartnersCapitaloftheOperatingPartnership">
        <link:definition>0000033 - Disclosure - Partners' Capital of the Operating Partnership</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SharebasedCompensation" roleURI="http://www.slgreen.com/role/SharebasedCompensation">
        <link:definition>0000034 - Disclosure - Share-based Compensation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccumulatedOtherComprehensiveIncomeLoss" roleURI="http://www.slgreen.com/role/AccumulatedOtherComprehensiveIncomeLoss">
        <link:definition>0000035 - Disclosure - Accumulated Other Comprehensive Income (Loss)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurements" roleURI="http://www.slgreen.com/role/FairValueMeasurements">
        <link:definition>0000036 - Disclosure - Fair Value Measurements</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsDerivativesandHedging" roleURI="http://www.slgreen.com/role/FinancialInstrumentsDerivativesandHedging">
        <link:definition>0000037 - Disclosure - Financial Instruments: Derivatives and Hedging</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeaseIncome" roleURI="http://www.slgreen.com/role/LeaseIncome">
        <link:definition>0000038 - Disclosure - Lease Income</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitPlans" roleURI="http://www.slgreen.com/role/BenefitPlans">
        <link:definition>0000039 - Disclosure - Benefit Plans</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingencies" roleURI="http://www.slgreen.com/role/CommitmentsandContingencies">
        <link:definition>0000040 - Disclosure - Commitments and Contingencies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentInformation" roleURI="http://www.slgreen.com/role/SegmentInformation">
        <link:definition>0000041 - Disclosure - Segment Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ScheduleIIIRealEstateandAccumulatedDepreciation" roleURI="http://www.slgreen.com/role/ScheduleIIIRealEstateandAccumulatedDepreciation">
        <link:definition>0000042 - Disclosure - Schedule III - Real Estate and Accumulated Depreciation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SignificantAccountingPoliciesPolicies" roleURI="http://www.slgreen.com/role/SignificantAccountingPoliciesPolicies">
        <link:definition>0000043 - Disclosure - Significant Accounting Policies (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OrganizationandBasisofPresentationTables" roleURI="http://www.slgreen.com/role/OrganizationandBasisofPresentationTables">
        <link:definition>0000044 - Disclosure - Organization and Basis of Presentation (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SignificantAccountingPoliciesTables" roleURI="http://www.slgreen.com/role/SignificantAccountingPoliciesTables">
        <link:definition>0000045 - Disclosure - Significant Accounting Policies (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PropertyAcquisitionsTables" roleURI="http://www.slgreen.com/role/PropertyAcquisitionsTables">
        <link:definition>0000046 - Disclosure - Property Acquisitions (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PropertiesHeldforSaleandPropertyDispositionsTables" roleURI="http://www.slgreen.com/role/PropertiesHeldforSaleandPropertyDispositionsTables">
        <link:definition>0000047 - Disclosure - Properties Held for Sale and Property Dispositions (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtandPreferredEquityInvestmentsTables" roleURI="http://www.slgreen.com/role/DebtandPreferredEquityInvestmentsTables">
        <link:definition>0000048 - Disclosure - Debt and Preferred Equity Investments (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsinUnconsolidatedJointVenturesTables" roleURI="http://www.slgreen.com/role/InvestmentsinUnconsolidatedJointVenturesTables">
        <link:definition>0000049 - Disclosure - Investments in Unconsolidated Joint Ventures (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DeferredCostsTables" roleURI="http://www.slgreen.com/role/DeferredCostsTables">
        <link:definition>0000050 - Disclosure - Deferred Costs (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="MortgagesandOtherLoansPayableTables" roleURI="http://www.slgreen.com/role/MortgagesandOtherLoansPayableTables">
        <link:definition>0000051 - Disclosure - Mortgages and Other Loans Payable (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CorporateIndebtednessTables" roleURI="http://www.slgreen.com/role/CorporateIndebtednessTables">
        <link:definition>0000052 - Disclosure - Corporate Indebtedness (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RelatedPartyTransactionsTables" roleURI="http://www.slgreen.com/role/RelatedPartyTransactionsTables">
        <link:definition>0000053 - Disclosure - Related Party Transactions (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NoncontrollingInterestsontheCompanysConsolidatedFinancialStatementsTables" roleURI="http://www.slgreen.com/role/NoncontrollingInterestsontheCompanysConsolidatedFinancialStatementsTables">
        <link:definition>0000054 - Disclosure - Noncontrolling Interests on the Company's Consolidated Financial Statements (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockholdersEquityoftheCompanyTables" roleURI="http://www.slgreen.com/role/StockholdersEquityoftheCompanyTables">
        <link:definition>0000055 - Disclosure - Stockholders' Equity of the Company (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PartnersCapitaloftheOperatingPartnershipTables" roleURI="http://www.slgreen.com/role/PartnersCapitaloftheOperatingPartnershipTables">
        <link:definition>0000056 - Disclosure - Partners' Capital of the Operating Partnership (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SharebasedCompensationTables" roleURI="http://www.slgreen.com/role/SharebasedCompensationTables">
        <link:definition>0000057 - Disclosure - Share-based Compensation (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccumulatedOtherComprehensiveIncomeLossTables" roleURI="http://www.slgreen.com/role/AccumulatedOtherComprehensiveIncomeLossTables">
        <link:definition>0000058 - Disclosure - Accumulated Other Comprehensive Income (Loss) (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsTables" roleURI="http://www.slgreen.com/role/FairValueMeasurementsTables">
        <link:definition>0000059 - Disclosure - Fair Value Measurements (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsDerivativesandHedgingTables" roleURI="http://www.slgreen.com/role/FinancialInstrumentsDerivativesandHedgingTables">
        <link:definition>0000060 - Disclosure - Financial Instruments: Derivatives and Hedging (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeaseIncomeTables" roleURI="http://www.slgreen.com/role/LeaseIncomeTables">
        <link:definition>0000061 - Disclosure - Lease Income (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitPlansTables" roleURI="http://www.slgreen.com/role/BenefitPlansTables">
        <link:definition>0000062 - Disclosure - Benefit Plans (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingenciesTables" roleURI="http://www.slgreen.com/role/CommitmentsandContingenciesTables">
        <link:definition>0000063 - Disclosure - Commitments and Contingencies (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentInformationTables" roleURI="http://www.slgreen.com/role/SegmentInformationTables">
        <link:definition>0000064 - Disclosure - Segment Information (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OrganizationandBasisofPresentationAdditionalInformationDetails" roleURI="http://www.slgreen.com/role/OrganizationandBasisofPresentationAdditionalInformationDetails">
        <link:definition>0000065 - Disclosure - Organization and Basis of Presentation - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OrganizationandBasisofPresentationScheduleofCommercialOfficePropertiesDetails" roleURI="http://www.slgreen.com/role/OrganizationandBasisofPresentationScheduleofCommercialOfficePropertiesDetails">
        <link:definition>0000066 - Disclosure - Organization and Basis of Presentation - Schedule of Commercial Office Properties (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SignificantAccountingPoliciesInvestmentsinCommercialRealEstatePropertiesDetails" roleURI="http://www.slgreen.com/role/SignificantAccountingPoliciesInvestmentsinCommercialRealEstatePropertiesDetails">
        <link:definition>0000067 - Disclosure - Significant Accounting Policies - Investments in Commercial Real Estate Properties (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SignificantAccountingPoliciesInvestmentinMarketableSecuritiesDetails" roleURI="http://www.slgreen.com/role/SignificantAccountingPoliciesInvestmentinMarketableSecuritiesDetails">
        <link:definition>0000068 - Disclosure - Significant Accounting Policies - Investment in Marketable Securities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SignificantAccountingPoliciesInvestmentsinUnconsolidatedJointVenturesDeferredLeaseCostsRevenueRecognitionIncomeTaxesDetails" roleURI="http://www.slgreen.com/role/SignificantAccountingPoliciesInvestmentsinUnconsolidatedJointVenturesDeferredLeaseCostsRevenueRecognitionIncomeTaxesDetails">
        <link:definition>0000069 - Disclosure - Significant Accounting Policies - Investments in Unconsolidated Joint Ventures/Deferred Lease Costs/Revenue Recognition/Income Taxes (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SignificantAccountingPoliciesConcentrationsofCreditRiskReclassificationDetails" roleURI="http://www.slgreen.com/role/SignificantAccountingPoliciesConcentrationsofCreditRiskReclassificationDetails">
        <link:definition>0000070 - Disclosure - Significant Accounting Policies - Concentrations of Credit Risk/Reclassification (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PropertyAcquisitions2022AcquisitionsDetails" roleURI="http://www.slgreen.com/role/PropertyAcquisitions2022AcquisitionsDetails">
        <link:definition>0000071 - Disclosure - Property Acquisitions - 2022 Acquisitions (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PropertyAcquisitions2021AcquisitionsDetails" roleURI="http://www.slgreen.com/role/PropertyAcquisitions2021AcquisitionsDetails">
        <link:definition>0000072 - Disclosure - Property Acquisitions - 2021 Acquisitions (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PropertyAcquisitions2020AcquisitionsDetails" roleURI="http://www.slgreen.com/role/PropertyAcquisitions2020AcquisitionsDetails">
        <link:definition>0000073 - Disclosure - Property Acquisitions - 2020 Acquisitions (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PropertiesHeldforSaleandPropertyDispositionsDetails" roleURI="http://www.slgreen.com/role/PropertiesHeldforSaleandPropertyDispositionsDetails">
        <link:definition>0000074 - Disclosure - Properties Held for Sale and Property Dispositions (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtandPreferredEquityInvestmentsRollForwardofNetBookBalancesDetails" roleURI="http://www.slgreen.com/role/DebtandPreferredEquityInvestmentsRollForwardofNetBookBalancesDetails">
        <link:definition>0000075 - Disclosure - Debt and Preferred Equity Investments - Roll Forward of Net Book Balances (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtandPreferredEquityInvestmentsDebtandPreferredEquityInvestmentsDetails" roleURI="http://www.slgreen.com/role/DebtandPreferredEquityInvestmentsDebtandPreferredEquityInvestmentsDetails">
        <link:definition>0000076 - Disclosure - Debt and Preferred Equity Investments - Debt and Preferred Equity Investments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtandPreferredEquityInvestmentsRollforwardofTotalAllowanceforLoanLossReservesDetails" roleURI="http://www.slgreen.com/role/DebtandPreferredEquityInvestmentsRollforwardofTotalAllowanceforLoanLossReservesDetails">
        <link:definition>0000077 - Disclosure - Debt and Preferred Equity Investments - Rollforward of Total Allowance for Loan Loss Reserves (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtandPreferredEquityInvestmentsInvestmentInFinancingReceivableDetails" roleURI="http://www.slgreen.com/role/DebtandPreferredEquityInvestmentsInvestmentInFinancingReceivableDetails">
        <link:definition>0000078 - Disclosure - Debt and Preferred Equity Investments - Investment In Financing Receivable (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtandPreferredEquityInvestmentsDebtInvestmentsDetails" roleURI="http://www.slgreen.com/role/DebtandPreferredEquityInvestmentsDebtInvestmentsDetails">
        <link:definition>0000079 - Disclosure - Debt and Preferred Equity Investments - Debt Investments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtandPreferredEquityInvestmentsPreferredEquityInvestmentsDetails" roleURI="http://www.slgreen.com/role/DebtandPreferredEquityInvestmentsPreferredEquityInvestmentsDetails">
        <link:definition>0000080 - Disclosure - Debt and Preferred Equity Investments - Preferred Equity Investments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtandPreferredEquityInvestmentsNarrativeDetails" roleURI="http://www.slgreen.com/role/DebtandPreferredEquityInvestmentsNarrativeDetails">
        <link:definition>0000081 - Disclosure - Debt and Preferred Equity Investments - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsinUnconsolidatedJointVenturesAdditionalInformationDetails" roleURI="http://www.slgreen.com/role/InvestmentsinUnconsolidatedJointVenturesAdditionalInformationDetails">
        <link:definition>0000082 - Disclosure - Investments in Unconsolidated Joint Ventures - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsinUnconsolidatedJointVenturesAcquisitionDevelopmentandConstructionArrangementsSaleofJointVentureInterestorPropertyDetails" roleURI="http://www.slgreen.com/role/InvestmentsinUnconsolidatedJointVenturesAcquisitionDevelopmentandConstructionArrangementsSaleofJointVentureInterestorPropertyDetails">
        <link:definition>0000083 - Disclosure - Investments in Unconsolidated Joint Ventures - Acquisition, Development and Construction Arrangements/Sale of Joint Venture Interest or Property (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsinUnconsolidatedJointVenturesMortgagesandOtherLoansPayableDetails" roleURI="http://www.slgreen.com/role/InvestmentsinUnconsolidatedJointVenturesMortgagesandOtherLoansPayableDetails">
        <link:definition>0000084 - Disclosure - Investments in Unconsolidated Joint Ventures - Mortgages and Other Loans Payable (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsinUnconsolidatedJointVenturesSchedulesofCombinedFinancialStatementsfortheUnconsolidatedJointVenturesDetails" roleURI="http://www.slgreen.com/role/InvestmentsinUnconsolidatedJointVenturesSchedulesofCombinedFinancialStatementsfortheUnconsolidatedJointVenturesDetails">
        <link:definition>0000085 - Disclosure - Investments in Unconsolidated Joint Ventures - Schedules of Combined Financial Statements for the Unconsolidated Joint Ventures (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DeferredCostsDetails" roleURI="http://www.slgreen.com/role/DeferredCostsDetails">
        <link:definition>0000086 - Disclosure - Deferred Costs (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="MortgagesandOtherLoansPayableDetails" roleURI="http://www.slgreen.com/role/MortgagesandOtherLoansPayableDetails">
        <link:definition>0000087 - Disclosure - Mortgages and Other Loans Payable (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CorporateIndebtednessAdditionalInformationDetails" roleURI="http://www.slgreen.com/role/CorporateIndebtednessAdditionalInformationDetails">
        <link:definition>0000088 - Disclosure - Corporate Indebtedness - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CorporateIndebtednessSeniorUnsecuredNotesDetails" roleURI="http://www.slgreen.com/role/CorporateIndebtednessSeniorUnsecuredNotesDetails">
        <link:definition>0000089 - Disclosure - Corporate Indebtedness - Senior Unsecured Notes (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CorporateIndebtednessJuniorSubordinatedDeferrableInterestDebenturesandPrincipalMaturitiesDetails" roleURI="http://www.slgreen.com/role/CorporateIndebtednessJuniorSubordinatedDeferrableInterestDebenturesandPrincipalMaturitiesDetails">
        <link:definition>0000090 - Disclosure - Corporate Indebtedness - Junior Subordinated Deferrable Interest Debentures and Principal Maturities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CorporateIndebtednessScheduleofConsolidatedInterestExpenseExcludingCapitalizedInterestDetails" roleURI="http://www.slgreen.com/role/CorporateIndebtednessScheduleofConsolidatedInterestExpenseExcludingCapitalizedInterestDetails">
        <link:definition>0000091 - Disclosure - Corporate Indebtedness - Schedule of Consolidated Interest Expense, Excluding Capitalized Interest (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CorporateIndebtedness2022TermLoanDetails" roleURI="http://www.slgreen.com/role/CorporateIndebtedness2022TermLoanDetails">
        <link:definition>0000092 - Disclosure - Corporate Indebtedness - 2022 Term Loan (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RelatedPartyTransactionsDetails" roleURI="http://www.slgreen.com/role/RelatedPartyTransactionsDetails">
        <link:definition>0000093 - Disclosure - Related Party Transactions (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NoncontrollingInterestsontheCompanysConsolidatedFinancialStatementsAdditionalInformationDetails" roleURI="http://www.slgreen.com/role/NoncontrollingInterestsontheCompanysConsolidatedFinancialStatementsAdditionalInformationDetails">
        <link:definition>0000094 - Disclosure - Noncontrolling Interests on the Company's Consolidated Financial Statements - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NoncontrollingInterestsontheCompanysConsolidatedFinancialStatementsPreferredUnitActivityDetails" roleURI="http://www.slgreen.com/role/NoncontrollingInterestsontheCompanysConsolidatedFinancialStatementsPreferredUnitActivityDetails">
        <link:definition>0000095 - Disclosure - Noncontrolling Interests on the Company's Consolidated Financial Statements - Preferred Unit Activity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockholdersEquityoftheCompanyAdditionalInformationDetails" roleURI="http://www.slgreen.com/role/StockholdersEquityoftheCompanyAdditionalInformationDetails">
        <link:definition>0000096 - Disclosure - Stockholders' Equity of the Company - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockholdersEquityoftheCompanyStockRepurchaseProgramDetails" roleURI="http://www.slgreen.com/role/StockholdersEquityoftheCompanyStockRepurchaseProgramDetails">
        <link:definition>0000097 - Disclosure - Stockholders' Equity of the Company - Stock Repurchase Program (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockholdersEquityoftheCompanyAttheMarketEquityOfferingProgramandPerpetualPreferredStockDetails" roleURI="http://www.slgreen.com/role/StockholdersEquityoftheCompanyAttheMarketEquityOfferingProgramandPerpetualPreferredStockDetails">
        <link:definition>0000098 - Disclosure - Stockholders' Equity of the Company - At-the-Market Equity Offering Program and Perpetual Preferred Stock (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockholdersEquityoftheCompanyScheduleofCommonStockIssuedandProceedsReceivedDividendReinvestmentsDetails" roleURI="http://www.slgreen.com/role/StockholdersEquityoftheCompanyScheduleofCommonStockIssuedandProceedsReceivedDividendReinvestmentsDetails">
        <link:definition>0000099 - Disclosure - Stockholders' Equity of the Company - Schedule of Common Stock Issued and Proceeds Received Dividend Reinvestments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockholdersEquityoftheCompanyEarningsperShareDetails" roleURI="http://www.slgreen.com/role/StockholdersEquityoftheCompanyEarningsperShareDetails">
        <link:definition>0000100 - Disclosure - Stockholders' Equity of the Company - Earnings per Share (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PartnersCapitaloftheOperatingPartnershipAdditionalInformationDetails" roleURI="http://www.slgreen.com/role/PartnersCapitaloftheOperatingPartnershipAdditionalInformationDetails">
        <link:definition>0000101 - Disclosure - Partners' Capital of the Operating Partnership - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PartnersCapitaloftheOperatingPartnershipEPSDetails" roleURI="http://www.slgreen.com/role/PartnersCapitaloftheOperatingPartnershipEPSDetails">
        <link:definition>0000102 - Disclosure - Partners' Capital of the Operating Partnership - EPS (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SharebasedCompensationAdditionalInformationDetails" roleURI="http://www.slgreen.com/role/SharebasedCompensationAdditionalInformationDetails">
        <link:definition>0000103 - Disclosure - Share-based Compensation - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SharebasedCompensationActivityDetails" roleURI="http://www.slgreen.com/role/SharebasedCompensationActivityDetails">
        <link:definition>0000104 - Disclosure - Share-based Compensation - Activity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccumulatedOtherComprehensiveIncomeLossDetails" roleURI="http://www.slgreen.com/role/AccumulatedOtherComprehensiveIncomeLossDetails">
        <link:definition>0000105 - Disclosure - Accumulated Other Comprehensive Income (Loss) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsDetails" roleURI="http://www.slgreen.com/role/FairValueMeasurementsDetails">
        <link:definition>0000106 - Disclosure - Fair Value Measurements (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsDerivativesandHedgingDetails" roleURI="http://www.slgreen.com/role/FinancialInstrumentsDerivativesandHedgingDetails">
        <link:definition>0000107 - Disclosure - Financial Instruments: Derivatives and Hedging (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeaseIncomeFutureMinimumRentsDetails" roleURI="http://www.slgreen.com/role/LeaseIncomeFutureMinimumRentsDetails">
        <link:definition>0000108 - Disclosure - Lease Income - Future Minimum Rents (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeaseIncomeLeaseIncomeDetails" roleURI="http://www.slgreen.com/role/LeaseIncomeLeaseIncomeDetails">
        <link:definition>0000109 - Disclosure - Lease Income - Lease Income (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeaseIncomeLeaseIncomeDetails_1" roleURI="http://www.slgreen.com/role/LeaseIncomeLeaseIncomeDetails_1">
        <link:definition>0000109 - Disclosure - Lease Income - Lease Income (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeaseIncomeSalesTypeLeaseDetails" roleURI="http://www.slgreen.com/role/LeaseIncomeSalesTypeLeaseDetails">
        <link:definition>0000110 - Disclosure - Lease Income - Sales Type Lease (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeaseIncomeSalesTypeLeaseDetails_1" roleURI="http://www.slgreen.com/role/LeaseIncomeSalesTypeLeaseDetails_1">
        <link:definition>0000110 - Disclosure - Lease Income - Sales Type Lease (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitPlansDetails" roleURI="http://www.slgreen.com/role/BenefitPlansDetails">
        <link:definition>0000111 - Disclosure - Benefit Plans (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingenciesDetails" roleURI="http://www.slgreen.com/role/CommitmentsandContingenciesDetails">
        <link:definition>0000112 - Disclosure - Commitments and Contingencies (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingenciesDetails_1" roleURI="http://www.slgreen.com/role/CommitmentsandContingenciesDetails_1">
        <link:definition>0000112 - Disclosure - Commitments and Contingencies (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingenciesLeaseCostDetails" roleURI="http://www.slgreen.com/role/CommitmentsandContingenciesLeaseCostDetails">
        <link:definition>0000113 - Disclosure - Commitments and Contingencies - Lease Cost (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentInformationAdditionalInformationDetails" roleURI="http://www.slgreen.com/role/SegmentInformationAdditionalInformationDetails">
        <link:definition>0000114 - Disclosure - Segment Information - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ScheduleIIIRealEstateandAccumulatedDepreciationDetails" roleURI="http://www.slgreen.com/role/ScheduleIIIRealEstateandAccumulatedDepreciationDetails">
        <link:definition>0000115 - Disclosure - Schedule III - Real Estate and Accumulated Depreciation (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ScheduleIIIRealEstateandAccumulatedDepreciationActivityinRealEstateandAccumulatedDepreciationDetails" roleURI="http://www.slgreen.com/role/ScheduleIIIRealEstateandAccumulatedDepreciationActivityinRealEstateandAccumulatedDepreciationDetails">
        <link:definition>0000116 - Disclosure - Schedule III - Real Estate and Accumulated Depreciation (Activity in Real Estate and Accumulated Depreciation) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="slg_InvestmentInJointVentureAggregateEquityCommittedByPartner" abstract="false" name="InvestmentInJointVentureAggregateEquityCommittedByPartner" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_RemovalofFullyDepreciatedRealEstateAssets" abstract="false" name="RemovalofFullyDepreciatedRealEstateAssets" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_OneVanderbiltMember" abstract="true" name="OneVanderbiltMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_A15911597BroadwayCrownePlazaMember" abstract="true" name="A15911597BroadwayCrownePlazaMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ThirdPartyMember" abstract="true" name="ThirdPartyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_WorldwidePlazaMember" abstract="true" name="WorldwidePlazaMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_DebtInvestmentsOther" abstract="false" name="DebtInvestmentsOther" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_ScheduleOfInvestmentInFinancingReceivablesAndRiskRatingTableTextBlock" abstract="false" name="ScheduleOfInvestmentInFinancingReceivablesAndRiskRatingTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="slg_PurchasePriceFairValueAdjustmentGainLoss" abstract="false" name="PurchasePriceFairValueAdjustmentGainLoss" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_ScheduleOfIntangibleAssetsAndLiabilitiesTableTextBlock" abstract="false" name="ScheduleOfIntangibleAssetsAndLiabilitiesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="slg_MezzanineLoanDueJune2023Member" abstract="true" name="MezzanineLoanDueJune2023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_NoncontrollingInterestAccruedDividendsOnPreferredUnits" abstract="false" name="NoncontrollingInterestAccruedDividendsOnPreferredUnits" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionOfBuildingAndImprovements" abstract="false" name="RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionOfBuildingAndImprovements" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_Tenant1Member" abstract="true" name="Tenant1Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_OtherComprehensiveIncomeLossDeferredNetLossfromTerminatedHedges" abstract="false" name="OtherComprehensiveIncomeLossDeferredNetLossfromTerminatedHedges" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_EquityMethodInvestmentOwnershipPercentageDeconsolidated" abstract="false" name="EquityMethodInvestmentOwnershipPercentageDeconsolidated" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="slg_CanadianPensionPlanInvestmentBoardMember" abstract="true" name="CanadianPensionPlanInvestmentBoardMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_StockholdersEquityLineItems" abstract="true" name="StockholdersEquityLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="slg_SeriesRPreferredStockMember" abstract="true" name="SeriesRPreferredStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_RealEstateSegmentMember" abstract="true" name="RealEstateSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ConsolidationOfRealEstateInvestment" abstract="false" name="ConsolidationOfRealEstateInvestment" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_SeriesSPreferredStockMember" abstract="true" name="SeriesSPreferredStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_RentExpensePolicyTextBlock" abstract="false" name="RentExpensePolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="slg_InterestRateCapExpiringFebruary2026Member" abstract="true" name="InterestRateCapExpiringFebruary2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_InvestmentInJointVenture" abstract="false" name="InvestmentInJointVenture" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_FifthAvenue717Member" abstract="true" name="FifthAvenue717Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_A55West46thStreetTower46Member" abstract="true" name="A55West46thStreetTower46Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_InterestRateCapExpiringSeptember2023Member" abstract="true" name="InterestRateCapExpiringSeptember2023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_DebtInvestmentsHeldAbstract" abstract="true" name="DebtInvestmentsHeldAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="slg_ThreeRetailandTwoResidentialUnitsMember" abstract="true" name="ThreeRetailandTwoResidentialUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_InterestRateSwapExpiringinJuly2023Member" abstract="true" name="InterestRateSwapExpiringinJuly2023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_TransactionCostsPolicyTextBlock" abstract="false" name="TransactionCostsPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="slg_MezzanineLoanDueApril2023Member" abstract="true" name="MezzanineLoanDueApril2023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_WhartonPropertiesMember" abstract="true" name="WhartonPropertiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_TransferToNetAssetsHeldForSale" abstract="false" name="TransferToNetAssetsHeldForSale" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_DepreciableRealEstateReservesEffectonEarnings" abstract="false" name="DepreciableRealEstateReservesEffectonEarnings" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_IsraeliInstitutionalInvestorMember" abstract="true" name="IsraeliInstitutionalInvestorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ConsolidationOfJointVentureInterest" abstract="false" name="ConsolidationOfJointVentureInterest" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_MathiasMember" abstract="true" name="MathiasMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_InterestRateCapExpiringAugust2023Member" abstract="true" name="InterestRateCapExpiringAugust2023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_TermLoanMember" abstract="true" name="TermLoanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_SecuredOvernightFinancingRateSOFRMember" abstract="true" name="SecuredOvernightFinancingRateSOFRMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_East42ndStreet110Member" abstract="true" name="East42ndStreet110Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ShareBasedCompensationArrangementByShareBasedPaymentAwardPeriodOfAwardVestingCommencement" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPeriodOfAwardVestingCommencement" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="slg_DiscontinuedOperationGainLossOnDisposalStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag" abstract="false" name="DiscontinuedOperationGainLossOnDisposalStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="slg_SeniorUnsecuredNotesDueDecember12022Member" abstract="true" name="SeniorUnsecuredNotesDueDecember12022Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_FinanceLeaseInterestExpenseBeforeCapitalizedInterest" abstract="false" name="FinanceLeaseInterestExpenseBeforeCapitalizedInterest" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_Broadway1552To1560Member" abstract="true" name="Broadway1552To1560Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ParkAvenue280Member" abstract="true" name="ParkAvenue280Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_SharebasedCompensationArrangementBySharebasedPaymentAwardNumberOfFungibleUnitsAvailableForGrant" abstract="false" name="SharebasedCompensationArrangementBySharebasedPaymentAwardNumberOfFungibleUnitsAvailableForGrant" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="slg_ParkAvenue450Member" abstract="true" name="ParkAvenue450Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_FutureAmortizationOfDebtFourthFullFiscalYear" abstract="false" name="FutureAmortizationOfDebtFourthFullFiscalYear" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_SECSchedule1229RealEstateCompaniesInvestmentInMortgageLoansOnRealEstateLoanLossReservePeriodIncreaseDecrease" abstract="false" name="SECSchedule1229RealEstateCompaniesInvestmentInMortgageLoansOnRealEstateLoanLossReservePeriodIncreaseDecrease" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_PreferredStockDividendMultiplierRatioPerCommonUnitDistribution" abstract="false" name="PreferredStockDividendMultiplierRatioPerCommonUnitDistribution" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="slg_TotalSharesAuthorized" abstract="false" name="TotalSharesAuthorized" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="slg_UnderwritingCommissionsandCostsPolicyPolicyTextBlock" abstract="false" name="UnderwritingCommissionsandCostsPolicyPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="slg_DeferredLeaseCostsAbstract" abstract="true" name="DeferredLeaseCostsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="slg_SeriesWPreferredStockMember" abstract="true" name="SeriesWPreferredStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_MortgageLoansOnRealEstateLoanValue" abstract="false" name="MortgageLoansOnRealEstateLoanValue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_NumberOfInvestmentsNonperforming" abstract="false" name="NumberOfInvestmentsNonperforming" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="slg_AssumptionOfMortgageLoan" abstract="false" name="AssumptionOfMortgageLoan" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_FinancingReceivableRecordedInOtherAssets" abstract="false" name="FinancingReceivableRecordedInOtherAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRateHighEndOfRange" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRateHighEndOfRange" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="slg_OperatingLeasesMinimumLeaseTerm" abstract="false" name="OperatingLeasesMinimumLeaseTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="slg_HolidayMember" abstract="true" name="HolidayMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_DebtInvestmentWithFloatingInterestRateMember" abstract="true" name="DebtInvestmentWithFloatingInterestRateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_InvestmentInJointVentureNumberOfPartnersInJointVenture" abstract="false" name="InvestmentInJointVentureNumberOfPartnersInJointVenture" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="slg_MortgageLoanPaidOffMember" abstract="true" name="MortgageLoanPaidOffMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_FinancingReceivableNumberOfDaysPastDueForSuspendingIncomeRecognition" abstract="false" name="FinancingReceivableNumberOfDaysPastDueForSuspendingIncomeRecognition" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="slg_FifthAvenue461Member" abstract="true" name="FifthAvenue461Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_FiniteLivedIntangibleLiabilitiesAbstract" abstract="true" name="FiniteLivedIntangibleLiabilitiesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="slg_SeriesKPreferredStockMember" abstract="true" name="SeriesKPreferredStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_TotalParOrStatedValuePerShare" abstract="false" name="TotalParOrStatedValuePerShare" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="slg_DeferredCompensationArrangementWithIndividualMaximumPercentageOfTheCompensationThatMayBeDeferred" abstract="false" name="DeferredCompensationArrangementWithIndividualMaximumPercentageOfTheCompensationThatMayBeDeferred" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="slg_SLGManagementLLCMember" abstract="true" name="SLGManagementLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_AccumulatedOtherComprehensiveIncomeLossGainLossfromChangesinFairValue" abstract="false" name="AccumulatedOtherComprehensiveIncomeLossGainLossfromChangesinFairValue" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_SeventhAvenue810Member" abstract="true" name="SeventhAvenue810Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ExtinguishmentOfDebtInConnectionWithPropertyDispositions" abstract="false" name="ExtinguishmentOfDebtInConnectionWithPropertyDispositions" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_InterestRateCapExpiringMay2024Member" abstract="true" name="InterestRateCapExpiringMay2024Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_DebtInstrumentInformationByScheduledMaturityDateOfDebtAbstract" abstract="true" name="DebtInstrumentInformationByScheduledMaturityDateOfDebtAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="slg_LineOfCreditFacilityNumberOfExtensions" abstract="false" name="LineOfCreditFacilityNumberOfExtensions" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="slg_NonCashLeaseExpense" abstract="false" name="NonCashLeaseExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_MezzanineLoanDueJuly2023Member" abstract="true" name="MezzanineLoanDueJuly2023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ServiceCorporationMember" abstract="true" name="ServiceCorporationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_SeniorUnsecuredNoteDueDecember172025Member" abstract="true" name="SeniorUnsecuredNoteDueDecember172025Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_DeferredStockCompensationPlanForDirectorsMember" abstract="true" name="DeferredStockCompensationPlanForDirectorsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_RelatedPartyTransactionStabilizationPeriod" abstract="false" name="RelatedPartyTransactionStabilizationPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="slg_InterestRateSwapExpiringInFebruary20273Member" abstract="true" name="InterestRateSwapExpiringInFebruary20273Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_DebtSecuritiesAvailableForSaleNumberOfSecuritiesSold" abstract="false" name="DebtSecuritiesAvailableForSaleNumberOfSecuritiesSold" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="slg_ThirdAvenue750Member" abstract="true" name="ThirdAvenue750Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_MezzanineLoanDueMay2023Member" abstract="true" name="MezzanineLoanDueMay2023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_LandmarkSquareMember" abstract="true" name="LandmarkSquareMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_SecuredDebtGross" abstract="false" name="SecuredDebtGross" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_East21Street66Member" abstract="true" name="East21Street66Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_DeferredLeaseCostsCapitalizedInPeriod" abstract="false" name="DeferredLeaseCostsCapitalizedInPeriod" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_TheMoinianGroupMember" abstract="true" name="TheMoinianGroupMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ScheduleOfGroundLeaseArrangementsTableTextBlock" abstract="false" name="ScheduleOfGroundLeaseArrangementsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="slg_FutureAmortizationOfDebtFirstFullFiscalYear" abstract="false" name="FutureAmortizationOfDebtFirstFullFiscalYear" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_East400Street58Member" abstract="true" name="East400Street58Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_A712MadisonAvenueMember" abstract="true" name="A712MadisonAvenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_FinitelyLivedIntangibleAssetsAbstract" abstract="true" name="FinitelyLivedIntangibleAssetsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="slg_NoncontrollingInterestDecreaseFromDistributionOnPreferredUnits" abstract="false" name="NoncontrollingInterestDecreaseFromDistributionOnPreferredUnits" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_PrudentialRealEstateInvestorsMember" abstract="true" name="PrudentialRealEstateInvestorsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_PurchasePriceFairValueAdjustmentGross" abstract="false" name="PurchasePriceFairValueAdjustmentGross" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_SecuredDebtFixedAndFloatingRateAmount" abstract="false" name="SecuredDebtFixedAndFloatingRateAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_LandmarkSquare7Member" abstract="true" name="LandmarkSquare7Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_InvestmentInRealEstatePolicyTextBlock" abstract="false" name="InvestmentInRealEstatePolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="slg_AvenueOfTheAmericas1185Member" abstract="true" name="AvenueOfTheAmericas1185Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ScheduleOfAcquiredAboveMarketAndBelowMarketLeasesFutureAmortizationExpenseTableTextBlock" abstract="false" name="ScheduleOfAcquiredAboveMarketAndBelowMarketLeasesFutureAmortizationExpenseTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="slg_MortgageLoansonRealEstateSeniorFinancing" abstract="false" name="MortgageLoansonRealEstateSeniorFinancing" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_InterestRateCapExpiringNovember20232Member" abstract="true" name="InterestRateCapExpiringNovember20232Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_LeasesBelowMarketMember" abstract="true" name="LeasesBelowMarketMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_NetIncomeLossAllocatedToCommonUnitholders" abstract="false" name="NetIncomeLossAllocatedToCommonUnitholders" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_AccumulatedOtherComprehensiveIncomeLossoftheCompanyRollForward" abstract="true" name="AccumulatedOtherComprehensiveIncomeLossoftheCompanyRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="slg_MezzanineLoanDueJune20232Member" abstract="true" name="MezzanineLoanDueJune20232Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_NumberOfResidentialUnits" abstract="false" name="NumberOfResidentialUnits" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="slg_NumberOfSharesOnRedemptionOfOneUnitOfPartnershipInterest" abstract="false" name="NumberOfSharesOnRedemptionOfOneUnitOfPartnershipInterest" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="slg_FutureAmortizationOfDebtFifthFullFiscalYear" abstract="false" name="FutureAmortizationOfDebtFifthFullFiscalYear" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_FourthAmendedandRestated2003StockOptionandIncentivePlanMember" abstract="true" name="FourthAmendedandRestated2003StockOptionandIncentivePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_SeriesQPreferredStockMember" abstract="true" name="SeriesQPreferredStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_EquityMethodInvestmentsWithNegativeBookValue" abstract="false" name="EquityMethodInvestmentsWithNegativeBookValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_DeferredCompensationPlanAndStockAwardShares" abstract="false" name="DeferredCompensationPlanAndStockAwardShares" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="slg_OperatingPartnershipNoncontrollingInterestFairValueAdjustment" abstract="false" name="OperatingPartnershipNoncontrollingInterestFairValueAdjustment" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_East220Street42Member" abstract="true" name="East220Street42Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_GreeneStreet121Member" abstract="true" name="GreeneStreet121Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_A30East40thStreetMember" abstract="true" name="A30East40thStreetMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_DebtInstrumentNumberofExtensionOptions" abstract="false" name="DebtInstrumentNumberofExtensionOptions" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="slg_DistributionsPreferredUnits" abstract="false" name="DistributionsPreferredUnits" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_RevolvingCreditFacilityMaturityMarch312022Member" abstract="true" name="RevolvingCreditFacilityMaturityMarch312022Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_RetailPropertiesMember" abstract="true" name="RetailPropertiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_NetIntangibleAssetsTransferredtoAssetsHeldforSale" abstract="false" name="NetIntangibleAssetsTransferredtoAssetsHeldforSale" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_A707EleventhAvenueMember" abstract="true" name="A707EleventhAvenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_RedemptionOfUnitsInOperatingPartnershipForSaleOfJointVenture" abstract="false" name="RedemptionOfUnitsInOperatingPartnershipForSaleOfJointVenture" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_MadisonAvenue762Member" abstract="true" name="MadisonAvenue762Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_IncrementalCommonUnitsAttributableToSpecialDividend" abstract="false" name="IncrementalCommonUnitsAttributableToSpecialDividend" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="slg_RealEstateAccumulatedDepreciationRealEstateSoldRetiredOrDeconsolidated" abstract="false" name="RealEstateAccumulatedDepreciationRealEstateSoldRetiredOrDeconsolidated" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_DeferredLeaseCostsPolicyTextBlock" abstract="false" name="DeferredLeaseCostsPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="slg_RelatedPartyTransactionStabilizationOfPropertyWithinThreeYearsAfterStabilizationPercent" abstract="false" name="RelatedPartyTransactionStabilizationOfPropertyWithinThreeYearsAfterStabilizationPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="slg_InterestRateSwapExpiringInJanuary20262Member" abstract="true" name="InterestRateSwapExpiringInJanuary20262Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ShareRepurchaseProgramNumberOfIncreasesToShareRepurchaseProgram" abstract="false" name="ShareRepurchaseProgramNumberOfIncreasesToShareRepurchaseProgram" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="slg_TimesSquare5Member" abstract="true" name="TimesSquare5Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ShareBasedCompensationArrangementbyShareBasedPaymentAwardFungibleUnitsPerShare" abstract="false" name="ShareBasedCompensationArrangementbyShareBasedPaymentAwardFungibleUnitsPerShare" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:decimalItemType"/>
  <xs:element id="slg_A110GreeneStreetMember" abstract="true" name="A110GreeneStreetMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_InterestRateCapExpiringJune20232Member" abstract="true" name="InterestRateCapExpiringJune20232Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_DistributionsToNoncontrollingInterests" abstract="false" name="DistributionsToNoncontrollingInterests" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_FinanceLeaseCost" abstract="false" name="FinanceLeaseCost" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_UnitDividendsUnits" abstract="false" name="UnitDividendsUnits" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="slg_SpringStreet115Member" abstract="true" name="SpringStreet115Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_PaymentsToAcquireLandBuildingsAndImprovements" abstract="false" name="PaymentsToAcquireLandBuildingsAndImprovements" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_AllianceBuildingServicesMember" abstract="true" name="AllianceBuildingServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_UncommittedMasterRepurchaseAgreement2017Member" abstract="true" name="UncommittedMasterRepurchaseAgreement2017Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_EquitySecuritiesFVNINumberOfSecuritiesSold" abstract="false" name="EquitySecuritiesFVNINumberOfSecuritiesSold" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="slg_PrivateInvestorsMember" abstract="true" name="PrivateInvestorsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_LineOfCreditFacilityTermOfExtension" abstract="false" name="LineOfCreditFacilityTermOfExtension" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="slg_AnnualizedRentMember" abstract="true" name="AnnualizedRentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_OrdinaryDividendMember" abstract="true" name="OrdinaryDividendMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_MezzanineLoanDueJune2024Member" abstract="true" name="MezzanineLoanDueJune2024Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_WeightedAverageAmortizationPeriodInPlaceLeaseCosts" abstract="false" name="WeightedAverageAmortizationPeriodInPlaceLeaseCosts" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="slg_OperatingLeasesEstimatedAverageLeaseTerm" abstract="false" name="OperatingLeasesEstimatedAverageLeaseTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="slg_LimitedPartnershipUnitsHeldByGeneralPartner" abstract="false" name="LimitedPartnershipUnitsHeldByGeneralPartner" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="slg_A333East22ndStMember" abstract="true" name="A333East22ndStMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_AndrewMathiasPresidentMember" abstract="true" name="AndrewMathiasPresidentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_KoreanInstitutionalInvestorIsraeliInstitutionalInvestorMember" abstract="true" name="KoreanInstitutionalInvestorIsraeliInstitutionalInvestorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_FinancingReceivableNonaccrualNoAllowanceNumber" abstract="false" name="FinancingReceivableNonaccrualNoAllowanceNumber" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="slg_LexingtonAvenue420Member" abstract="true" name="LexingtonAvenue420Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ProceedsFromConsolidationOfRealEstateInvestment" abstract="false" name="ProceedsFromConsolidationOfRealEstateInvestment" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_MarcHollidayChairmanAndCEOMember" abstract="true" name="MarcHollidayChairmanAndCEOMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_OperatingLeaseCostBeforeCapitalizedOperatingLeaseCosts" abstract="false" name="OperatingLeaseCostBeforeCapitalizedOperatingLeaseCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_A590FifthAvenueMember" abstract="true" name="A590FifthAvenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_RelatedPartyTransactionStabilizationOfPropertyThreeYearsOrMoreAfterStabilizationPercent" abstract="false" name="RelatedPartyTransactionStabilizationOfPropertyThreeYearsOrMoreAfterStabilizationPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="slg_InterestRateSwapExpiringInJune2027Member" abstract="true" name="InterestRateSwapExpiringInJune2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ScheduleofCommonStockIssuedandProceedsReceivedDividendReinvestmentsTableTextBlock" abstract="false" name="ScheduleofCommonStockIssuedandProceedsReceivedDividendReinvestmentsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="slg_NumberOfCollectiveBargainingArrangements" abstract="false" name="NumberOfCollectiveBargainingArrangements" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="slg_AccruedInterestPayableAndOtherMember" abstract="true" name="AccruedInterestPayableAndOtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_FifthAvenue609Member" abstract="true" name="FifthAvenue609Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_A315West33rdStreetMember" abstract="true" name="A315West33rdStreetMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_StockholdersEquityTable" abstract="true" name="StockholdersEquityTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="slg_MortgagesAssumedInConnectionWithSaleOfRealEstate" abstract="false" name="MortgagesAssumedInConnectionWithSaleOfRealEstate" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsInPeriodFairValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsInPeriodFairValue" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_ProceedsFromOtherObligationRelatedToSecuredBorrowing" abstract="false" name="ProceedsFromOtherObligationRelatedToSecuredBorrowing" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_A11MadisonAveMember" abstract="true" name="A11MadisonAveMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_TermLoan2022Member" abstract="true" name="TermLoan2022Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_BelmontInsuranceCompanyMember" abstract="true" name="BelmontInsuranceCompanyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_DebtInvestmentsInMortgageLoansMember" abstract="true" name="DebtInvestmentsInMortgageLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_EquityMethodInvestmentEconomicInterestPercentage" abstract="false" name="EquityMethodInvestmentEconomicInterestPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="slg_StockOptionsStockAppreciationRightsAndOtherAwardsMember" abstract="true" name="StockOptionsStockAppreciationRightsAndOtherAwardsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_VornadoRealtyTrustMember" abstract="true" name="VornadoRealtyTrustMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_RepaymentsOrRedemptionOfDebtAndPreferredEquityInvestments" abstract="false" name="RepaymentsOrRedemptionOfDebtAndPreferredEquityInvestments" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_ProfitLossLessPreferredDistributions" abstract="false" name="ProfitLossLessPreferredDistributions" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_A185BroadwayMember" abstract="true" name="A185BroadwayMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ScheduleOfOtherIdentifiableAssetsFutureAmortizationExpenseTableTextBlock" abstract="false" name="ScheduleOfOtherIdentifiableAssetsFutureAmortizationExpenseTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="slg_EquityMethodInvestmentsSummarizedFinancialInformationIncomeStatementTableTextBlock" abstract="false" name="EquityMethodInvestmentsSummarizedFinancialInformationIncomeStatementTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="slg_InterestRateCapExpiringNovember2023Member" abstract="true" name="InterestRateCapExpiringNovember2023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_CommonUnitsRedemptionPeriodOfRestriction" abstract="false" name="CommonUnitsRedemptionPeriodOfRestriction" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="slg_BlackRockIncAndStonehengePartnersMember" abstract="true" name="BlackRockIncAndStonehengePartnersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_SpecialDividendMember" abstract="true" name="SpecialDividendMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_PreferredEquityMember" abstract="true" name="PreferredEquityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_BuildingLeaseholdInterestMember" abstract="true" name="BuildingLeaseholdInterestMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ScheduleofCalculationofNumeratorandDenominatorinEarningsPerUnitTableTextBlock" abstract="false" name="ScheduleofCalculationofNumeratorandDenominatorinEarningsPerUnitTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="slg_IncreaseDecreaseInAccruedLiabilitiesAndOther" abstract="false" name="IncreaseDecreaseInAccruedLiabilitiesAndOther" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_InterestRateCapExpiringSeptember20232Member" abstract="true" name="InterestRateCapExpiringSeptember20232Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ExchangeOfPreferredEquityInvestmentForRealEstateOrEquityInJointVenture" abstract="false" name="ExchangeOfPreferredEquityInvestmentForRealEstateOrEquityInJointVenture" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_SecuredDebtBearingFixedInterestAmount" abstract="false" name="SecuredDebtBearingFixedInterestAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_SeriesIPreferredStockMember" abstract="true" name="SeriesIPreferredStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_RollforwardAnalysisofPreferredUnitActivityRollForward" abstract="true" name="RollforwardAnalysisofPreferredUnitActivityRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="slg_ShareBasedCompensationArrangementbyShareBasedPaymentAwardPreferredUnitDistributionsasaPercentageofCommonUnitDistributions" abstract="false" name="ShareBasedCompensationArrangementbyShareBasedPaymentAwardPreferredUnitDistributionsasaPercentageofCommonUnitDistributions" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="slg_ScheduleOfOwnershipInterestsTable" abstract="true" name="ScheduleOfOwnershipInterestsTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="slg_ClassOLTIPUnitsMember" abstract="true" name="ClassOLTIPUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_SecuredDebtBearingVariableInterestAmount" abstract="false" name="SecuredDebtBearingVariableInterestAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_FinanceLeaseCostsAbstract" abstract="true" name="FinanceLeaseCostsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="slg_CreditFacility2017Member" abstract="true" name="CreditFacility2017Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_A7Dey185BroadwayMember" abstract="true" name="A7Dey185BroadwayMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_FinanceLeaseLiabilityExcludingAssetsHeldForSale" abstract="false" name="FinanceLeaseLiabilityExcludingAssetsHeldForSale" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_ParkAvenue100Member" abstract="true" name="ParkAvenue100Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_AmsterdamAvenue1080Member" abstract="true" name="AmsterdamAvenue1080Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_TransferToLiabilitiesRelatedToNetAssetsHeldForSale" abstract="false" name="TransferToLiabilitiesRelatedToNetAssetsHeldForSale" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_RelatedPartyStephenLGreenInterestMember" abstract="true" name="RelatedPartyStephenLGreenInterestMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_WhartonPropertiesPrivateInvestorMember" abstract="true" name="WhartonPropertiesPrivateInvestorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_DistributedEarningsDiluted" abstract="false" name="DistributedEarningsDiluted" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_IncrementalCommonUnitsAttributabletoSharebasedPaymentArrangements" abstract="false" name="IncrementalCommonUnitsAttributabletoSharebasedPaymentArrangements" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="slg_Beekman15Member" abstract="true" name="Beekman15Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_DeferredFinancingAndLeasingCostsDisclosureTextBlock" abstract="false" name="DeferredFinancingAndLeasingCostsDisclosureTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="slg_LandmarkSquare1To6Member" abstract="true" name="LandmarkSquare1To6Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_InterestRateSwapExpiringJanuary2023Member" abstract="true" name="InterestRateSwapExpiringJanuary2023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_MortgageAndMezzanineLoanPaidOffMember" abstract="true" name="MortgageAndMezzanineLoanPaidOffMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_A690MadisonAvenueMember" abstract="true" name="A690MadisonAvenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_RelatedPartyTransactionStabilizationOfPropertyAnniversaryPeriod" abstract="false" name="RelatedPartyTransactionStabilizationOfPropertyAnniversaryPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="slg_ManhattanMember" abstract="true" name="ManhattanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_BuildingLeaseholdImprovementsGross" abstract="false" name="BuildingLeaseholdImprovementsGross" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_MezzanineLoanPaidOff2Member" abstract="true" name="MezzanineLoanPaidOff2Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_FutureAmortizationOfDebtSecondFullFiscalYear" abstract="false" name="FutureAmortizationOfDebtSecondFullFiscalYear" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_DistributionToNoncontrollingInterestOperatingPartnership" abstract="false" name="DistributionToNoncontrollingInterestOperatingPartnership" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_AFundManagedByMeritzAlternativeInvestmentManagementMember" abstract="true" name="AFundManagedByMeritzAlternativeInvestmentManagementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_InPlaceLeasesMember" abstract="true" name="InPlaceLeasesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_DevelopmentPropertiesMember" abstract="true" name="DevelopmentPropertiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_OrdinaryIncomeDividendMember" abstract="true" name="OrdinaryIncomeDividendMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_OperatingLeaseLiabilityExcludingAssetsHeldForSale" abstract="false" name="OperatingLeaseLiabilityExcludingAssetsHeldForSale" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_A635641SixthAvenueMember" abstract="true" name="A635641SixthAvenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_NewYorkStateTeachersRetirementSystemMember" abstract="true" name="NewYorkStateTeachersRetirementSystemMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_NationalPensionServiceOfKoreaHinesInterestLPInternationalInvestorMember" abstract="true" name="NationalPensionServiceOfKoreaHinesInterestLPInternationalInvestorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_SevenOneNineSeventhAvenueMember" abstract="true" name="SevenOneNineSeventhAvenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_InterestRateSwapExpiringInFebruary20274Member" abstract="true" name="InterestRateSwapExpiringInFebruary20274Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_A752760MadisonAvenueMember" abstract="true" name="A752760MadisonAvenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_InvestmentinJointVenturePartnersOwnershipPercentage" abstract="false" name="InvestmentinJointVenturePartnersOwnershipPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="slg_NumberOfTenants" abstract="false" name="NumberOfTenants" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="slg_StructuredFinanceSegmentMember" abstract="true" name="StructuredFinanceSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_InterestRateCapExpiringJune2023Member" abstract="true" name="InterestRateCapExpiringJune2023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_SeriesVPreferredStockMember" abstract="true" name="SeriesVPreferredStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_PaymentsForProceedsFromOtherInvestments" abstract="false" name="PaymentsForProceedsFromOtherInvestments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_MortgageLoansOnRealEstateSeniorDebtOnInvestment" abstract="false" name="MortgageLoansOnRealEstateSeniorDebtOnInvestment" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_East40047thStreetMember" abstract="true" name="East40047thStreetMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_A85FifthAvenueMember" abstract="true" name="A85FifthAvenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ThirdAvenue919Member" abstract="true" name="ThirdAvenue919Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_InterestRateSwapExpiringInNovember2023Member" abstract="true" name="InterestRateSwapExpiringInNovember2023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ReversalOfAssetsHeldForSale" abstract="false" name="ReversalOfAssetsHeldForSale" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_DebtInstrumentPeriodofExtensionOption" abstract="false" name="DebtInstrumentPeriodofExtensionOption" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="slg_A106SpringStreetMemberMember" abstract="true" name="A106SpringStreetMemberMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_InvestmentInJointVentureAggregateMaximumOwnershipPercentage" abstract="false" name="InvestmentInJointVentureAggregateMaximumOwnershipPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="slg_RealEstateCostOfRealEstateSoldRetiredOrDeconsolidated" abstract="false" name="RealEstateCostOfRealEstateSoldRetiredOrDeconsolidated" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_NetIncomeLossAvailableToCommonStockholdersAfterDistributedAndUndistributedEarningsAllocationBasic" abstract="false" name="NetIncomeLossAvailableToCommonStockholdersAfterDistributedAndUndistributedEarningsAllocationBasic" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_Broadway1515Member" abstract="true" name="Broadway1515Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_DebtInstrumentFaceAmountLimitIncrease" abstract="false" name="DebtInstrumentFaceAmountLimitIncrease" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_RXRRealtyNewYorkREITMember" abstract="true" name="RXRRealtyNewYorkREITMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_WashingtonBoulevard1055Member" abstract="true" name="WashingtonBoulevard1055Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_StonehengePropertiesMember" abstract="true" name="StonehengePropertiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_WilliamsburgMember" abstract="true" name="WilliamsburgMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_MinorityInterestIncreaseDecreaseFromFairValueAdjustment" abstract="false" name="MinorityInterestIncreaseDecreaseFromFairValueAdjustment" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRateLowEndOfRange" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRateLowEndOfRange" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="slg_ConcentrationRiskPercentageThreshold" abstract="false" name="ConcentrationRiskPercentageThreshold" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="slg_DeferredCompensationPlanAndStockAwardNet" abstract="false" name="DeferredCompensationPlanAndStockAwardNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_IncomeLossFromContinuingOperationsBeforeRealizedGainLossOnDisposalOfEquityMethodInvestment" abstract="false" name="IncomeLossFromContinuingOperationsBeforeRealizedGainLossOnDisposalOfEquityMethodInvestment" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_VariableInterestEntityNotPrimaryBeneficiaryInvestment" abstract="false" name="VariableInterestEntityNotPrimaryBeneficiaryInvestment" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesToBeIssuedIfEqualToFungibleUnits" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesToBeIssuedIfEqualToFungibleUnits" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="slg_LexingtonAvenue485Member" abstract="true" name="LexingtonAvenue485Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_IncomeLossFromEquityMethodInvestmentsGainsLossesOnExtinguishmentOfDebt" abstract="false" name="IncomeLossFromEquityMethodInvestmentsGainsLossesOnExtinguishmentOfDebt" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_ScheduleOfSalesTypeLeasesTableTextBlock" abstract="false" name="ScheduleOfSalesTypeLeasesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="slg_DistributionsToNoncontrollingInterestsOtherPartnerships" abstract="false" name="DistributionsToNoncontrollingInterestsOtherPartnerships" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_SeriesLPreferredStockMember" abstract="true" name="SeriesLPreferredStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ParkAvenue245Member" abstract="true" name="ParkAvenue245Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_OwnershipInterestsLineItems" abstract="true" name="OwnershipInterestsLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="slg_OperatingLeaseLeaseIncomeFixedAndVariableLeasePayments" abstract="false" name="OperatingLeaseLeaseIncomeFixedAndVariableLeasePayments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_A133GreeneStreetMember" abstract="true" name="A133GreeneStreetMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_InterestRateSwapExpiringInFebruary20272Member" abstract="true" name="InterestRateSwapExpiringInFebruary20272Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_IssuanceOfSpecialDistributionPaidPrimarilyInUnits" abstract="false" name="IssuanceOfSpecialDistributionPaidPrimarilyInUnits" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_East53rdStreet10Member" abstract="true" name="East53rdStreet10Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_SUMMITOneVanderbiltMember" abstract="true" name="SUMMITOneVanderbiltMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_TermLoanBMaturityNovember212024Member" abstract="true" name="TermLoanBMaturityNovember212024Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_FinanceLeaseInterestExpenseCapitalized" abstract="false" name="FinanceLeaseInterestExpenseCapitalized" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_OneMadisonAvenueMember" abstract="true" name="OneMadisonAvenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_InterestRateSwapExpiringFebruary2023Member" abstract="true" name="InterestRateSwapExpiringFebruary2023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_RentalRevenueIncreaseDecreaseAcquiredLeaseAmortization" abstract="false" name="RentalRevenueIncreaseDecreaseAcquiredLeaseAmortization" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_TermLoanAMaturityMarch312023Member" abstract="true" name="TermLoanAMaturityMarch312023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_InterestRateCapExpiringFebruary2023Member" abstract="true" name="InterestRateCapExpiringFebruary2023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ExcessStockParOrStatedValuePerShare" abstract="false" name="ExcessStockParOrStatedValuePerShare" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="slg_RXRRealtyLedInvestmentGroupMember" abstract="true" name="RXRRealtyLedInvestmentGroupMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_OperatingPartnershipMember" abstract="true" name="OperatingPartnershipMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_SecuredDebtAndOtherLoansPayable" abstract="false" name="SecuredDebtAndOtherLoansPayable" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_SecuredDebtandOtherLoansPayableNet" abstract="false" name="SecuredDebtandOtherLoansPayableNet" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_MezzanineLoanDueJanuary2025Member" abstract="true" name="MezzanineLoanDueJanuary2025Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_MortgagesReclassedToLiabilitiesRelatedToAssetsHeldForSale" abstract="false" name="MortgagesReclassedToLiabilitiesRelatedToAssetsHeldForSale" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_FutureAmortizationOfDebtThirdFullFiscalYear" abstract="false" name="FutureAmortizationOfDebtThirdFullFiscalYear" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_CapitalGainsDividendMember" abstract="true" name="CapitalGainsDividendMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_MultiemployerPlansContributionsByEmployerPercent" abstract="false" name="MultiemployerPlansContributionsByEmployerPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="slg_FixedRateMember" abstract="true" name="FixedRateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_RightOfUseAssetsFinancingLeaseMember" abstract="true" name="RightOfUseAssetsFinancingLeaseMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_OperatingLeaseCostAbstract" abstract="true" name="OperatingLeaseCostAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="slg_ScheduleOfMortgageAndOtherLoansPayableOnJointVenturePropertiesTableTextBlock" abstract="false" name="ScheduleOfMortgageAndOtherLoansPayableOnJointVenturePropertiesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="slg_PropertiesSoldIn20222021And2020Member" abstract="true" name="PropertiesSoldIn20222021And2020Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_A410TenthAvenueMember" abstract="true" name="A410TenthAvenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_A15BeekmanMember" abstract="true" name="A15BeekmanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_SeriesPPreferredStockMember" abstract="true" name="SeriesPPreferredStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ShareRepurchasesPayable" abstract="false" name="ShareRepurchasesPayable" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_GroundLeasesTermOfContract" abstract="false" name="GroundLeasesTermOfContract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="slg_SaleOfInterestInPartiallyOwnedEntity" abstract="false" name="SaleOfInterestInPartiallyOwnedEntity" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_DeferredFinancingCostsPolicyTextBlock" abstract="false" name="DeferredFinancingCostsPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="slg_DiscountOfStructuredFinanceInvestments" abstract="false" name="DiscountOfStructuredFinanceInvestments" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_LoansandLeasesReceivableFundingObligation" abstract="false" name="LoansandLeasesReceivableFundingObligation" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_PreferredEquityInvestmentsInMortgageLoansMember" abstract="true" name="PreferredEquityInvestmentsInMortgageLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_HeraldSquare2Member" abstract="true" name="HeraldSquare2Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_MezzanineLoanDueDecember2029Member" abstract="true" name="MezzanineLoanDueDecember2029Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_PreferredEquityFebruary2027Member" abstract="true" name="PreferredEquityFebruary2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_WellsFargoMember" abstract="true" name="WellsFargoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_InterestRateSwapExpiringInJanuary2026Member" abstract="true" name="InterestRateSwapExpiringInJanuary2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ScheduleOfDeferredCostsTableTextBlock" abstract="false" name="ScheduleOfDeferredCostsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="slg_IncomeLossFromEquityMethodInvestmentsMember" abstract="true" name="IncomeLossFromEquityMethodInvestmentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_DividendReinvestmentAndStockPurchasePlanMember" abstract="true" name="DividendReinvestmentAndStockPurchasePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_MezzanineLoanPaidOffMember" abstract="true" name="MezzanineLoanPaidOffMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_FutureAmortizationOfDebtAfterFifthFullFiscalYear" abstract="false" name="FutureAmortizationOfDebtAfterFifthFullFiscalYear" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_ThirdAvenue885Member" abstract="true" name="ThirdAvenue885Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_EquityMethodInvestmentsSummarizedFinancialInformationBalanceSheetTableTextBlock" abstract="false" name="EquityMethodInvestmentsSummarizedFinancialInformationBalanceSheetTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="slg_WeightedAverageAmortizationPeriodAboveMarketLeaseCosts" abstract="false" name="WeightedAverageAmortizationPeriodAboveMarketLeaseCosts" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="slg_TiconderogaInsuranceCompanyMember" abstract="true" name="TiconderogaInsuranceCompanyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_CommercialRealEstatePropertiesDepreciationandAmortization" abstract="false" name="CommercialRealEstatePropertiesDepreciationandAmortization" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_CommonStockCapitalSharesReservedIssuanceUponRedemptionOfUnitsOfLimitedPartnership" abstract="false" name="CommonStockCapitalSharesReservedIssuanceUponRedemptionOfUnitsOfLimitedPartnership" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="slg_DebtAndPreferredEquityInvestmentsPolicyTextBlock" abstract="false" name="DebtAndPreferredEquityInvestmentsPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="slg_TotalCostsAndExpensesIncludingNonoperatingIncomeExpense" abstract="false" name="TotalCostsAndExpensesIncludingNonoperatingIncomeExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_PartnersCapitalAccountValueUnitDividend" abstract="false" name="PartnersCapitalAccountValueUnitDividend" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_OperatingLeaseCostCapitalized" abstract="false" name="OperatingLeaseCostCapitalized" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_PGIMRealEstateMember" abstract="true" name="PGIMRealEstateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_BuildingFeeOwnershipMember" abstract="true" name="BuildingFeeOwnershipMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_West11Street34Member" abstract="true" name="West11Street34Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_MadisonAve11Member" abstract="true" name="MadisonAve11Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_DepreciableRealEstateReservesCashFlowEffect" abstract="false" name="DepreciableRealEstateReservesCashFlowEffect" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_InterestRateCapExpiringJanuary2023Member" abstract="true" name="InterestRateCapExpiringJanuary2023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_MortgagesAndOtherLoansPayableDisclosureAbstract" abstract="true" name="MortgagesAndOtherLoansPayableDisclosureAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="slg_InterestRateSwapExpiringInJanuary2024Member" abstract="true" name="InterestRateSwapExpiringInJanuary2024Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_MortgageLoansOnRealEstateFairValueHighEndOfRange" abstract="false" name="MortgageLoansOnRealEstateFairValueHighEndOfRange" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_MezzanineLoanDueMay20232Member" abstract="true" name="MezzanineLoanDueMay20232Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_InvestmentInJointVentureOwnershipPercentage" abstract="false" name="InvestmentInJointVentureOwnershipPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="slg_DebtSecuritiesAvailableForSaleNumberOfSecuritiesRepaid" abstract="false" name="DebtSecuritiesAvailableForSaleNumberOfSecuritiesRepaid" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="slg_FutureAmortizationOfDebtAbstract" abstract="true" name="FutureAmortizationOfDebtAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="slg_SLGreenManagementMember" abstract="true" name="SLGreenManagementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ProceedsFromNoncontrollingInterestsInOtherPartnerships" abstract="false" name="ProceedsFromNoncontrollingInterestsInOtherPartnerships" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_MinorityInterestUnitsOfPartnershipOwnedByNoncontrollingOwners" abstract="false" name="MinorityInterestUnitsOfPartnershipOwnedByNoncontrollingOwners" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="slg_DisposalGroupIncludingDiscontinuedOperationOwnershipInterestDisposed" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationOwnershipInterestDisposed" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="slg_EarningsPerUnitPolicyPolicyTextBlock" abstract="false" name="EarningsPerUnitPolicyPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="slg_WeightedAverageAmortizationPeriodBelowMarketLeaseCosts" abstract="false" name="WeightedAverageAmortizationPeriodBelowMarketLeaseCosts" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="slg_IncrementalCommonSharesAttributableToRedemptionOfUnitsToCommonShares" abstract="false" name="IncrementalCommonSharesAttributableToRedemptionOfUnitsToCommonShares" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="slg_A19East65thStreetMember" abstract="true" name="A19East65thStreetMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_NationalPensionServiceOfKoreaHinesInterestLPMember" abstract="true" name="NationalPensionServiceOfKoreaHinesInterestLPMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ReallocationofNoncontrollingInterestInOperatingPartnershipIncreaseDecrease" abstract="false" name="ReallocationofNoncontrollingInterestInOperatingPartnershipIncreaseDecrease" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_OtherComprehensiveIncomeLossNetofTaxLessPortionAttributabletoNoncontrollingInterest" abstract="false" name="OtherComprehensiveIncomeLossNetofTaxLessPortionAttributabletoNoncontrollingInterest" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_ThirdAmendmentandRestated2005StockOptionandIncentivePlanMember" abstract="true" name="ThirdAmendmentandRestated2005StockOptionandIncentivePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_CreditFacility2012Member" abstract="true" name="CreditFacility2012Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_OtherAwardsMember" abstract="true" name="OtherAwardsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ScheduleOfDebtAndPreferredEquityBookBalanceRollForwardTableTextBlock" abstract="false" name="ScheduleOfDebtAndPreferredEquityBookBalanceRollForwardTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="slg_MadisonAvenue625Member" abstract="true" name="MadisonAvenue625Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ThirdAvenue800Member" abstract="true" name="ThirdAvenue800Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_OperatingPartnershipCommonUnitValuePerShareUseForConversion" abstract="false" name="OperatingPartnershipCommonUnitValuePerShareUseForConversion" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="slg_FifthAvenue650Member" abstract="true" name="FifthAvenue650Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_InterestRateSwapExpiringInJanuary20243Member" abstract="true" name="InterestRateSwapExpiringInJanuary20243Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionOfLand" abstract="false" name="RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionOfLand" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_A605West42ndStreetMember" abstract="true" name="A605West42ndStreetMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_OtherPropertyInvestmentsMember" abstract="true" name="OtherPropertyInvestmentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ParkAvenue125Member" abstract="true" name="ParkAvenue125Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_InterestRateCapExpiringSeptember20233Member" abstract="true" name="InterestRateCapExpiringSeptember20233Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_MortgageAndOtherLoansPayableTableTextBlock" abstract="false" name="MortgageAndOtherLoansPayableTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="slg_W57Street555Member" abstract="true" name="W57Street555Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_AvenueOfTheAmericas1350Member" abstract="true" name="AvenueOfTheAmericas1350Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_RealEstateByLocationAxis" abstract="true" name="RealEstateByLocationAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="slg_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestInOtherPartnershipAbstract" abstract="true" name="StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestInOtherPartnershipAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="slg_ProfitLossLessMinorityInterestInNetIncomeLossOperatingPartnerships" abstract="false" name="ProfitLossLessMinorityInterestInNetIncomeLossOperatingPartnerships" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_FinancingReceivablePortfolioSegmentsNumber" abstract="false" name="FinancingReceivablePortfolioSegmentsNumber" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="slg_DeconsolidationOfSubsidiaryMortgage" abstract="false" name="DeconsolidationOfSubsidiaryMortgage" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_InterestRateSwapExpiringInFebruary2027Member" abstract="true" name="InterestRateSwapExpiringInFebruary2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_PrivateInvestorWhartonPropertiesMember" abstract="true" name="PrivateInvestorWhartonPropertiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_AllianzRealEstateOfAmericaMember" abstract="true" name="AllianzRealEstateOfAmericaMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_EmploymentAgreementsMinimumCashBasedCompensationInNextFiscalYear" abstract="false" name="EmploymentAgreementsMinimumCashBasedCompensationInNextFiscalYear" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_MortgageLoansOnRealEstateFairValueLowEndOfRange" abstract="false" name="MortgageLoansOnRealEstateFairValueLowEndOfRange" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_AuditInformationAbstract" abstract="true" name="AuditInformationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="slg_LesseeFeeInterestOwnershipPercentage" abstract="false" name="LesseeFeeInterestOwnershipPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="slg_A3.25PercentSeniorUnsecuredNotesDueOctober2022Member" abstract="true" name="A3.25PercentSeniorUnsecuredNotesDueOctober2022Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_OperatingLeaseCostPercentageRentAmount" abstract="false" name="OperatingLeaseCostPercentageRentAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_ShareBasedCompensationArrangementByShareBasedPaymentAwardDurationOfOfferingPeriods" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardDurationOfOfferingPeriods" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="slg_RealEstateByLocationDomain" abstract="true" name="RealEstateByLocationDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_InterestRateSwapExpiringInJanuary20242Member" abstract="true" name="InterestRateSwapExpiringInJanuary20242Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_OriginationOfDebtAndPreferredEquityInvestments" abstract="false" name="OriginationOfDebtAndPreferredEquityInvestments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_ShareBasedCompensationArrangementbyShareBasedPaymentAwardNumberofFungibleUnitsAuthorized" abstract="false" name="ShareBasedCompensationArrangementbyShareBasedPaymentAwardNumberofFungibleUnitsAuthorized" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="slg_SeniorUnsecuredNotesMember" abstract="true" name="SeniorUnsecuredNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_StockRepurchaseProgramAuthorizedAmountTotal" abstract="false" name="StockRepurchaseProgramAuthorizedAmountTotal" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_RecognitionOfSalesTypeLeasesAndRelatedLeaseLiabilities" abstract="false" name="RecognitionOfSalesTypeLeasesAndRelatedLeaseLiabilities" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionAbstract" abstract="true" name="RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="slg_ChurchStreet100Member" abstract="true" name="ChurchStreet100Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_NetIncomeLossAllocatedtoCommonUnitholdersIncludingAntidilutiveEffect" abstract="false" name="NetIncomeLossAllocatedtoCommonUnitholdersIncludingAntidilutiveEffect" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsWeightedAverageExercisePriceRollForward" abstract="true" name="SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsWeightedAverageExercisePriceRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="slg_InterestRateCapExpiringMay20242Member" abstract="true" name="InterestRateCapExpiringMay20242Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_SeniorNotesNetofDeferredFinanceCosts" abstract="false" name="SeniorNotesNetofDeferredFinanceCosts" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_NetIntangibleLiabilitiesTransferredtoLiabilitiesRelatedtoAssetsHeldforSale" abstract="false" name="NetIntangibleLiabilitiesTransferredtoLiabilitiesRelatedtoAssetsHeldforSale" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_InterestRateSwapExpiringInMay2027Member" abstract="true" name="InterestRateSwapExpiringInMay2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_DebtInstrumentInterestPaymentDefermentNumberOfConsecutiveQuarters" abstract="false" name="DebtInstrumentInterestPaymentDefermentNumberOfConsecutiveQuarters" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="slg_GeneralAndLimitedPartnersCapitalAccount" abstract="false" name="GeneralAndLimitedPartnersCapitalAccount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_OtherIdentifiableAssetsMember" abstract="true" name="OtherIdentifiableAssetsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_LineOfCreditFacilityOptionalExpansionMaximumBorrowingCapacity" abstract="false" name="LineOfCreditFacilityOptionalExpansionMaximumBorrowingCapacity" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_InterestRateSwapExpiringInJanuary2028Member" abstract="true" name="InterestRateSwapExpiringInJanuary2028Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_LongTermIncentivePlanUnitsMember" abstract="true" name="LongTermIncentivePlanUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_InterestRateSwapExpiringinJuly20232Member" abstract="true" name="InterestRateSwapExpiringinJuly20232Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_DebtInstrumentFaceAmountHigherBorrowingCapacityOption" abstract="false" name="DebtInstrumentFaceAmountHigherBorrowingCapacityOption" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_ManagedOfficePropertiesMember" abstract="true" name="ManagedOfficePropertiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_RealEstateWeightedAverageOccupancy" abstract="false" name="RealEstateWeightedAverageOccupancy" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="slg_MezzanineDebtMember" abstract="true" name="MezzanineDebtMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_LongTermDebtMaturitiesRepaymentsOfPrincipal" abstract="false" name="LongTermDebtMaturitiesRepaymentsOfPrincipal" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_PreferredEquityPaidOffMember" abstract="true" name="PreferredEquityPaidOffMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_MortgageAndOtherLoansPayableMember" abstract="true" name="MortgageAndOtherLoansPayableMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_DebtAndPreferredEquityReserves" abstract="false" name="DebtAndPreferredEquityReserves" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_PropertyInterestLiquidationMember" abstract="true" name="PropertyInterestLiquidationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_FutureAmortizationOfDebt" abstract="false" name="FutureAmortizationOfDebt" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_ThreeResidentialUnitsMember" abstract="true" name="ThreeResidentialUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ThirdAvenue711Member" abstract="true" name="ThirdAvenue711Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_InterestRateSwapExpiringFebruary20232Member" abstract="true" name="InterestRateSwapExpiringFebruary20232Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_HolidayAndMathiasMember" abstract="true" name="HolidayAndMathiasMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_SuburbanMember" abstract="true" name="SuburbanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_DeconsolidationRealEstateInvestments" abstract="false" name="DeconsolidationRealEstateInvestments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_IssuanceOfSpecialDividendStockDividend" abstract="false" name="IssuanceOfSpecialDividendStockDividend" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_RelatedPartyTransactionPercentageofProfitsDuetoInvestors" abstract="false" name="RelatedPartyTransactionPercentageofProfitsDuetoInvestors" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="slg_VariousPartnersMember" abstract="true" name="VariousPartnersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_ParkAvenue304Member" abstract="true" name="ParkAvenue304Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_SellerFinancedPurchases" abstract="false" name="SellerFinancedPurchases" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="slg_A2016RepurchaseProgramMember" abstract="true" name="A2016RepurchaseProgramMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="slg_PeriodFromCessationOfMajorConstructionActivityToCompletionOfConstructionProjectMaximum" abstract="false" name="PeriodFromCessationOfMajorConstructionActivityToCompletionOfConstructionProjectMaximum" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
</xs:schema>
