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      <Form990PartVIISectionAGrp>
        <PersonNm>Michael Esposito</PersonNm>
        <TitleTxt>Vice Chair</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Wayne AI Frederick</PersonNm>
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        <PersonNm>Marina Kellen French</PersonNm>
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        <PersonNm>Giammaria Giuliani</PersonNm>
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        <PersonNm>Robert Goldstein</PersonNm>
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        <PersonNm>Warren B Kanders</PersonNm>
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        <PersonNm>Scott Kapnick</PersonNm>
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        <PersonNm>Monica Keany</PersonNm>
        <TitleTxt>Vice Chair</TitleTxt>
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        <PersonNm>Sacha Lainovic</PersonNm>
        <TitleTxt>Member</TitleTxt>
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        <PersonNm>Richard Landgarten</PersonNm>
        <TitleTxt>Member-Join BOT 2024</TitleTxt>
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        <PersonNm>Laurie Hodges Lapeyre</PersonNm>
        <TitleTxt>Vice Chair</TitleTxt>
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        <PersonNm>Pablo Legorreta</PersonNm>
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        <PersonNm>Lara R Lerner</PersonNm>
        <TitleTxt>Member</TitleTxt>
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        <PersonNm>Kathy Leventhal</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Thomas H Lister</PersonNm>
        <TitleTxt>Co-Chair</TitleTxt>
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        <PersonNm>Patrice Louvet</PersonNm>
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        <PersonNm>Alan S MacDonald</PersonNm>
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        <PersonNm>Celene Menschel</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Sarah E Nash</PersonNm>
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        <PersonNm>Mary Kathryn Navab</PersonNm>
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        <PersonNm>Terence M O'Toole</PersonNm>
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        <PersonNm>Matthew H Peltz</PersonNm>
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        <PersonNm>Steven Rattner</PersonNm>
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        <PersonNm>Scott Rechler</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Edward Skyler</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Nicholas Somers</PersonNm>
        <TitleTxt>Member-Join BOT 2024</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Jonathan Sobel</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Deirdre Stanley</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Robert K Steel</PersonNm>
        <TitleTxt>Co-Chair</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Jonathan Tisch</PersonNm>
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        <PersonNm>Frances Townsend</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Robin Vince</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Jeffrey Wilpon</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Ellen M Wright</PersonNm>
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      <TotReportableCompRltdOrgAmt>13469508</TotReportableCompRltdOrgAmt>
      <TotalOtherCompensationAmt>441999</TotalOtherCompensationAmt>
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      <FormerOfcrEmployeesListedInd>true</FormerOfcrEmployeesListedInd>
      <TotalCompGreaterThan150KInd>true</TotalCompGreaterThan150KInd>
      <CompensationFromOtherSrcsInd>false</CompensationFromOtherSrcsInd>
      <ContractorCompensationGrp>
        <ContractorName>
          <PersonNm>ROLST CONSTRUCTION CO</PersonNm>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>75-22 METROPOLITAN AVENUE</AddressLine1Txt>
            <CityNm>MIDDLE VILLAGE</CityNm>
            <StateAbbreviationCd>NY</StateAbbreviationCd>
            <ZIPCd>11379</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>CONSTRUCTION</ServicesDesc>
        <CompensationAmt>1775330</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <PersonNm>THE BELAIRE CONDOMINIUM</PersonNm>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>524 E 72 ST</AddressLine1Txt>
            <CityNm>NEW YORK</CityNm>
            <StateAbbreviationCd>NY</StateAbbreviationCd>
            <ZIPCd>10021</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>ENGINEERING FEES</ServicesDesc>
        <CompensationAmt>671029</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <PersonNm>NIKO K CONSTRUCTION C</PersonNm>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>45-67 196TH PL</AddressLine1Txt>
            <CityNm>FLUSHING</CityNm>
            <StateAbbreviationCd>NY</StateAbbreviationCd>
            <ZIPCd>11358</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>CONSTRUCTION</ServicesDesc>
        <CompensationAmt>380000</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <PersonNm>ISTATS MAINTENANCE CO</PersonNm>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>11 EDWARDS LANE</AddressLine1Txt>
            <CityNm>GLEN COVE</CityNm>
            <StateAbbreviationCd>NY</StateAbbreviationCd>
            <ZIPCd>11542</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>CONSTRUCTION</ServicesDesc>
        <CompensationAmt>270888</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <PersonNm>RICHMOND ELEVATOR CO INC</PersonNm>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>17 RECTOR ST</AddressLine1Txt>
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            <StateAbbreviationCd>NY</StateAbbreviationCd>
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        <RelatedOrExemptFuncIncomeAmt>68680447</RelatedOrExemptFuncIncomeAmt>
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      <ProgramServiceRevenueGrp>
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        <RelatedOrExemptFuncIncomeAmt>4085517</RelatedOrExemptFuncIncomeAmt>
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      <ProgramServiceRevenueGrp>
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        <BusinessCd>531110</BusinessCd>
        <TotalRevenueColumnAmt>933629</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>933629</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
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        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Andy Miller</PersonNm>
        <TitleTxt>Member/Attending Physician</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>485170</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>70317</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>31050</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>4180</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>590717</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Andrew A Sama</PersonNm>
        <TitleTxt>Member/Attending Physician</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>163144</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>389</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>17099</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>68214</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>248846</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Bryan T Kelly</PersonNm>
        <TitleTxt>President &amp; CEO</TitleTxt>
        <BaseCompensationFilingOrgAmt>135160</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>2568034</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>122296</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>2323629</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>4026</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>76477</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>1553</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>29498</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>3445</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>65471</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>266480</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>5063109</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Louis A Shapiro-THRU 2023</PersonNm>
        <TitleTxt>Former President &amp; CEO</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>1260000</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>2168637</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>3428637</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Stacey L Malakoff</PersonNm>
        <TitleTxt>EVP &amp; Chief Financial Officer</TitleTxt>
        <BaseCompensationFilingOrgAmt>189997</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>1393313</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>140925</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>1033446</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>13729</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>100684</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>3726</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>27324</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>7401</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>54272</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>355778</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>2609039</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Irene Koch</PersonNm>
        <TitleTxt>EVP &amp; Chief Legal Officer</TitleTxt>
        <BaseCompensationFilingOrgAmt>85887</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>772979</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>47561</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>428045</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>3843</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>34586</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>2587</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>23288</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>2062</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>18559</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>141940</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>1277457</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 4A</FormAndLineReferenceDesc>
        <ExplanationTxt>Louis A. Shapiro, Former President &amp; Chief Executive Officer, received severance pay of $2,100,000, which are included in Schedule J, Part II, Column (B)(III). Severance payments began January 2024 and ended December 2024.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE J, PART I, LINE 5B</FormAndLineReferenceDesc>
        <ExplanationTxt>Certain Employed Physicians listed on Part VII, Section A, Line 1A receive compensation in part, based on professional service generated from services they personally performed in their individual practices. In 2024, no Physician was paid compensation contingent upon the organization's overall revenue or net earnings.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE J, PART I, LINE 6B</FormAndLineReferenceDesc>
        <ExplanationTxt>Performance based incentive awards are paid to officers and key employees based on a number of important quality, satisfaction, efficiency, and financial measures, of which achieving budget is a factor.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="IRS990ScheduleO">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A - LINE 6 &amp; 7A - "MEMBERSHIP"</FormAndLineReferenceDesc>
        <ExplanationTxt>HSS PROPERTIES CORPORATION IS A MEMBERSHIP CORPORATION WITH THE HOSPITAL FOR SPECIAL SURGERY FUND, INC, AS ITS SOLE MEMBER. THE HOSPITAL FOR SPECIAL SURGERY FUND, INC., AS THE MEMBER OF HSS PROPERTIES CORPORATION, ELECTS THE BOARD OF TRUSTEES OF HSS PROPERTIES CORPORATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B - LINE 11B, "REVIEW PROCESS"</FormAndLineReferenceDesc>
        <ExplanationTxt>The Form 990 is prepared by the management and reviewed by an outside independent accounting firm. PRIOR TO SUBMITTING THE FORM 990 TO THE INTERNAL REVENUE SERVICE (IRS), THERE IS AN ESTABLISHED PROCESS FOR REVIEW OF THE DOCUMENT IN ITS ENTIRETY BY THE GOVERNING BODY WHOSE EVALUATIONS ARE MADE IN THE BEST INTEREST OF HSS PROPERTIES CORPORATION. THE FORM 990 IS FIRST REVIEWED WITH THE EXECUTIVE COMPENSATION COMMITTEE OF THE BOARD OF TRUSTEES. THE REVIEWED FORM 990 IS THEN SUBMITTED TO THE FULL BOARD OF TRUSTEES. THE TRUSTEES ARE PROVIDED A COPY OF THE FORM 990 PRIOR TO SUBMISSION OF THE FORM. IN ADDITION, SIGNIFICANT AREAS OF FORM 990 ARE DISCUSSED AT A BOARD OF TRUSTEES MEETING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B - LINE 12C, "CONFLICT OF INTEREST POLICY"</FormAndLineReferenceDesc>
        <ExplanationTxt>ON AN ANNUAL BASIS, INTEREST DISCLOSURE STATEMENTS ARE SENT TO ALL BOARD MEMBERS, OFFICERS, MEDICAL STAFF, MANAGEMENT, FELLOWS, RESIDENTS, RESEARCH PROFESSIONAL STAFF, IRB MEMBERS, AND OTHER DESIGNATED GROUPS. OUR CONFLICT OF INTEREST AND COMMITMENT POLICY ALSO REQUIRES THAT ANY COVERED PERSON, INCLUDING MEMBERS OF THE HSS MEDICAL STAFF MUST PROVIDE PRIOR NOTICE TO COMPLIANCE BEFORE BEGINNING ANY ACTIVITY OR SIGNIFICANTLY MODIFYING THE TERMS OF ANY EXISTING OUTSIDE PROFESSIONAL ACTIVITY, WHERE THE COVERED PERSON HAS A FINANCIAL INTEREST VALUED IN EXCESS OF $5,000 OR EQUITY INTERESTS OF INDETERMINATE VALUE. DISCLOSURES MAY BE MADE THROUGH HSS' ONLINE REPORTING PLATFORM, MYDISCLOSURES OR DIRECTLY TO COMPLIANCE. THE REPORTED INTERESTS ARE REVIEWED BY THE EXECUTIVE VICE PRESIDENT FOR LEGAL AFFAIRS, THE CHIEF EXECUTIVE OFFICER, AND THE AUDIT AND CORPORATE COMPLIANCE COMMITTEE OF THE BOARD OF TRUSTEES. SUMMARY INFORMATION IS PROVIDED TO SERVICE CHIEFS, AS REQUESTED, SO THAT THEY ARE AWARE OF THE FINANCIAL INTERESTS OF THE MEDICAL STAFF WITHIN THEIR SPECIALTY. IN ADDITION TO SENDING DISCLOSURE STATEMENTS DIRECTLY TO THE GROUP NOTED ABOVE, INDUSTRY WEBSITES ARE MONITORED FOR DISCLOSURES RELATED TO EMPLOYEES OF HSS properties. THIS INFORMATION IS ENTERED INTO THE DATABASE, AS WELL. HSS properties HAS A CONFLICT OF INTEREST COMMITTEE THAT MEETS AT LEAST THREE TIMES A YEAR, OR AS NECESSARY AND IS CHARGED WITH ADJUDICATING COMPLEX CONFLICTS OF INTEREST AND COMMITMENT, DEVELOPING AND ADOPTING REASONABLE AND APPROPRIATE CONFLICT MANAGEMENT PLANS AND SERVING AS A POLICY ADVISORY TO THE HSS BOARD OF TRUSTEES AND HSS EXECUTIVE LEADERSHIP.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECT B - LINE 15A &amp; 15B, "PROCESS FOR DETERMINING COMP"</FormAndLineReferenceDesc>
        <ExplanationTxt>HSS PROPERTIES CORPORATION IS COMMITTED TO ENSURING THAT ITS EXECUTIVE COMPENSATION PROGRAM ADHERES TO THE HIGHEST STANDARDS OF REGULATORY COMPLIANCE AND BEST CORPORATE GOVERNANCE. THE HSS PROPERTIES CORPORATION BOARD HAS CHARGED THE COMPENSATION COMMITTEE (WHICH IS COMPOSED Of INDEPENDENT BOARD MEMBERS WITH NO CONFLICTS OF INTEREST IN REGARD TO EXECUTIVE COMPENSATION) WITH MAKING ALL DECISIONS RELATED TO COMPENSATION FOR OFFICERS AND KEY EMPLOYEES. THE COMMITTEE RETAINS AN INDEPENDENT COMPENSATION CONSULTANT TO ASSIST IT IN THIS PROCESS. COMPENSATION LEVELS ARE ESTABLISHED CONSIDERING DATA FOR FUNCTIONALLY COMPARABLE ROLES IN COMPARABLE ORGANIZATIONS, AN ASSESSMENT OF PERFORMANCE, AND OTHER BUSINESS JUDGMENT FACTORS, CONSISTENT WITH HSS PROPERTIES CORPORATION'S EXECUTIVE COMPENSATION PHILOSOPHY. ALL COMPENSATION DECISIONS ARE CAREFULLY DOCUMENTED IN MINUTES ON A REGULAR AND TIMELY BASIS. THE COMMITTEE'S DECISIONS ARE MADE IN THE BEST INTERESTS OF HSS PROPERTIES CORPORATION, AND ARE INTENDED TO ENSURE THE RECRUITMENT AND RETENTION OF KEY EXECUTIVE TALENT, CONSISTENT WITH THE MARKET PRACTICES OF OTHER NOT-FOR-PROFIT HEALTH CARE ORGANIZATIONS OF COMPARABLE MISSION AND COMPLEXITY, CONSIDERING BOTH LOCAL AND NATIONAL MARKET CHALLENGES IN SUCH REGARD. ON AN ANNUAL BASIS (INCLUDING 2024), THE COMMITTEE PROVIDES THE FULL BOARD WITH AN OVERVIEW OF ITS DETERMINATIONS AND PROCESS. HSS PROPERTIES CORPORATION ESTABLISHED THIS PROCESS IN AN EFFORT TO COMPLY WITH THE INTERMEDIATE SANCTIONS GUIDELINES FOR QUALIFYING FOR THE REBUTTABLE PRESUMPTION OF REASONABLENESS, AS WELL AS SUPPORT BEST CORPORATE GOVERNANCE PRACTICES IN ENSURING THE TRANSPARENCY OF THE EXECUTIVE COMPENSATION DECISION-MAKING PROCESS WITH THE BOARD.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B - LINE 19, "DISCLOSURE GOVERNING DOCUMENTS"</FormAndLineReferenceDesc>
        <ExplanationTxt>HSS PROPERTIES CORPORATION MAKES ITS GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY AND FINANCIAL STATEMENTS AVAILABLE TO THE GENERAL PUBLIC UPON REQUEST FROM THE OFFICE OF LEGAL AFFAIRS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9, "OTHER CHANGES IN NET ASSETS OR FUND BALANCES"</FormAndLineReferenceDesc>
        <ExplanationTxt>NON-OPERATING GAIN FROM INVESTMENT IN 300 PBL, LLC OF $721,659.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
    <IRS990ScheduleR documentId="IRS990ScheduleR">
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        <DisregardedEntityName>
          <BusinessNameLine1Txt>NY SOC REL RUPT CRIPLD MAINTAING HSS</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>535 EAST 70TH STREET</AddressLine1Txt>
          <CityNm>NEW YORK</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10021</ZIPCd>
        </USAddress>
        <EIN>131624135</EIN>
        <PrimaryActivitiesTxt>HEALTH CARE</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>NY</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501 (C)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>3</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>NA</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>false</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>HOSPITAL FOR SPECIAL SURGERY FUND inc</BusinessNameLine1Txt>
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        <USAddress>
          <AddressLine1Txt>535 EAST 70TH STREET</AddressLine1Txt>
          <CityNm>NEW YORK</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10021</ZIPCd>
        </USAddress>
        <EIN>136714749</EIN>
        <PrimaryActivitiesTxt>FUNDRAISING</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>NY</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501 (C)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>7</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>NA</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>false</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>HSS HORIZONS INC</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>535 EAST 70TH STREET</AddressLine1Txt>
          <CityNm>NEW YORK</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10021</ZIPCd>
        </USAddress>
        <EIN>134152131</EIN>
        <PrimaryActivitiesTxt>RESEARCH SUPP</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>NY</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501 (C)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>12 TYPE I</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>HSS FUND INC</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>true</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>TJA ORTHOPEDIC SURGERY PC</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>535 EAST 70TH STREET</AddressLine1Txt>
          <CityNm>NEW YORK</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10021</ZIPCd>
        </USAddress>
        <EIN>815178969</EIN>
        <PrimaryActivitiesTxt>HEALTH CARE</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>NY</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501 (C)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>10</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>HSS</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>false</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedOrgTxblPartnershipGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>HSS ASC OF MANHATTAN LLC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>1233 2ND AVE</AddressLine1Txt>
          <CityNm>NEW YORK</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10065</ZIPCd>
        </USAddress>
        <EIN>471353602</EIN>
        <PrimaryActivitiesTxt>HEALTH CARE</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>NY</LegalDomicileStateCd>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>NA</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <PredominantIncomeTypeTxt>N/A</PredominantIncomeTypeTxt>
      </IdRelatedOrgTxblPartnershipGrp>
      <IdRelatedOrgTxblPartnershipGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>HSS WESTSIDE ASC LLC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>600 WEST 58TH STREET</AddressLine1Txt>
          <CityNm>NEW YORK</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10019</ZIPCd>
        </USAddress>
        <EIN>814351390</EIN>
        <PrimaryActivitiesTxt>HEALTH CARE</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>NY</LegalDomicileStateCd>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>NA</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <PredominantIncomeTypeTxt>N/A</PredominantIncomeTypeTxt>
      </IdRelatedOrgTxblPartnershipGrp>
      <IdRelatedOrgTxblPartnershipGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>HSS-FL PHYSICIANS LLC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>535 EAST 70TH STREET</AddressLine1Txt>
          <CityNm>NEW YORK</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10021</ZIPCd>
        </USAddress>
        <EIN>824502169</EIN>
        <PrimaryActivitiesTxt>HEALTH CARE</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>FL</LegalDomicileStateCd>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>NA</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <PredominantIncomeTypeTxt>N/A</PredominantIncomeTypeTxt>
      </IdRelatedOrgTxblPartnershipGrp>
      <IdRelatedOrgTxblPartnershipGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>HSS Long Island ASC LLC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>90 Merrick Ave East Meadow</AddressLine1Txt>
          <CityNm>New York</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>11554</ZIPCd>
        </USAddress>
        <EIN>884133340</EIN>
        <PrimaryActivitiesTxt>HEALTH CARE</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>NY</LegalDomicileStateCd>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>NA</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <PredominantIncomeTypeTxt>N/A</PredominantIncomeTypeTxt>
      </IdRelatedOrgTxblPartnershipGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>MEDICAL INDEMNITY ASSURANCE COMPANY LTD</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>535 EAST 70TH STREET</AddressLine1Txt>
          <CityNm>NEW YORK</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10021</ZIPCd>
        </USAddress>
        <EIN>981050215</EIN>
        <PrimaryActivitiesTxt>SELF-INDEMNITY</PrimaryActivitiesTxt>
        <LegalDomicileForeignCountryCd>CJ</LegalDomicileForeignCountryCd>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>NA</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <EntityTypeTxt>C CORP</EntityTypeTxt>
        <ControlledOrganizationInd>true</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>HSS VENTURES</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>535 EAST 70TH STREET</AddressLine1Txt>
          <CityNm>NEW YORK</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10021</ZIPCd>
        </USAddress>
        <EIN>061624300</EIN>
        <PrimaryActivitiesTxt>HLTH CARE SERVICE</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>NY</LegalDomicileStateCd>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>NA</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <EntityTypeTxt>C CORP</EntityTypeTxt>
        <ControlledOrganizationInd>true</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>HSS Physicians PA</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>535 East 70th Street</AddressLine1Txt>
          <CityNm>New York</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10021</ZIPCd>
        </USAddress>
        <EIN>932717310</EIN>
        <PrimaryActivitiesTxt>Medical Billing</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>NJ</LegalDomicileStateCd>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>NA</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <EntityTypeTxt>c corp</EntityTypeTxt>
        <ControlledOrganizationInd>false</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <ReceiptOfIntAnntsRntsRyltsInd>false</ReceiptOfIntAnntsRntsRyltsInd>
      <GiftGrntOrCapContriToOthOrgInd>false</GiftGrntOrCapContriToOthOrgInd>
      <GiftGrntCapContriFromOthOrgInd>false</GiftGrntCapContriFromOthOrgInd>
      <LoansOrGuaranteesToOtherOrgInd>false</LoansOrGuaranteesToOtherOrgInd>
      <LoansOrGuaranteesFromOthOrgInd>true</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>false</DivRelatedOrganizationInd>
      <AssetSaleToOtherOrgInd>false</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>false</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>false</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>true</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>false</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>false</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>true</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>false</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>true</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>true</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>true</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>true</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>false</TransferFromOtherOrgInd>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>HOSPITAL FOR SPECIAL SURGERY</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>J</TransactionTypeTxt>
        <InvolvedAmt>59605302</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>ALLOC COST</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>HOSPITAL FOR SPECIAL SURGERY</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>P</TransactionTypeTxt>
        <InvolvedAmt>59284371</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>ALLOC COST</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>HOSPITAL FOR SPECIAL SURGERY</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>M</TransactionTypeTxt>
        <InvolvedAmt>2600491</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>ALLOC COST</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>HOSPITAL FOR SPECIAL SURGERY</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>E</TransactionTypeTxt>
        <InvolvedAmt>15081296</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>ALLOC COST</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>HOSPITAL FOR SPECIAL SURGERY</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>R</TransactionTypeTxt>
        <InvolvedAmt>607951</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>ALLOC COST</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>HSS ASC OF MANHATTAN LLC</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>J</TransactionTypeTxt>
        <InvolvedAmt>1580312</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>ALLOC COST</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>HSS ASC OF MANHATTAN LLC</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>Q</TransactionTypeTxt>
        <InvolvedAmt>588482</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>ALLOC COST</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>HSS WEST SIDE ASC LLC</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>J</TransactionTypeTxt>
        <InvolvedAmt>1535398</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>ALLOC COST</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>HSS WEST SIDE ASC LLC</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>Q</TransactionTypeTxt>
        <InvolvedAmt>299349</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>ALLOC COST</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE R, PART V, LINE 1o</FormAndLineReferenceDesc>
        <ExplanationTxt>The amounts for sharing of paid employees with related organization(s) are included in line m, performance of services or membership or fundraising solicitations by related organization.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleR>
  </ReturnData>
</Return>