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        <PersonNm>HOLLY HEGENER</PersonNm>
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        <PersonNm>HUME R STEYER</PersonNm>
        <TitleTxt>SECRETARY</TitleTxt>
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        <PersonNm>JOHN ERNST</PersonNm>
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        <PersonNm>JOHN H ADAMS</PersonNm>
        <TitleTxt>CO-CHAIR OF THE BOARD (OUTGOING)</TitleTxt>
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        <PersonNm>JOHN P CAHILL</PersonNm>
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        <PersonNm>JOSHUA GINSBERG PHD</PersonNm>
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        <PersonNm>JUDE WU ABEL</PersonNm>
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        <PersonNm>KATHERINE O ROBERTS</PersonNm>
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        <PersonNm>LEA PAINE HIGHET</PersonNm>
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        <PersonNm>LEISLE LIN</PersonNm>
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        <PersonNm>MARJORIE VAN DERCOOK</PersonNm>
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        <PersonNm>NICOLE HYLTON-PATTERSON</PersonNm>
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        <PersonNm>PATRICIA F SULLIVAN</PersonNm>
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        <PersonNm>RICHARD REMMER</PersonNm>
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        <PersonNm>SAMUEL G HUBER</PersonNm>
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        <PersonNm>SUSAN BABCOCK</PersonNm>
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        <PersonNm>T JEFFERSON CUNNINGHAM III</PersonNm>
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        <PersonNm>THOMAS MCHENRY</PersonNm>
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        <PersonNm>YUKI MOORE LAURENTI</PersonNm>
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        <PersonNm>ABIGAIL WEINBERG</PersonNm>
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        <PersonNm>ALICE GLEASON</PersonNm>
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        <PersonNm>CHRISTOPHER J ELLIMAN</PersonNm>
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        <PersonNm>DAVID KIERAN-KAUFMAN</PersonNm>
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        <PersonNm>EILEEN LARABEE</PersonNm>
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        <PersonNm>IRENE LEE</PersonNm>
        <TitleTxt>VP OF LAND, NORTHEAST</TitleTxt>
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        <PersonNm>JEFFREY LEJAVA</PersonNm>
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        <PersonNm>JENNIE GREER</PersonNm>
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        <PersonNm>JESSICA WATSON</PersonNm>
        <TitleTxt>VP OF CONSERVATION COMMUNITIES</TitleTxt>
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        <PersonNm>KATHLEEN MOSER</PersonNm>
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        <PersonNm>LARS KULLESEID</PersonNm>
        <TitleTxt>PRESIDENT &amp; CEO (INCOMING 04/24)</TitleTxt>
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        <PersonNm>MARIA WHITEHEAD</PersonNm>
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        <PersonNm>MAY MAY CHENG</PersonNm>
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        <PersonNm>NATHAN BERRY</PersonNm>
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        <PersonNm>NICK RICHARDSON</PersonNm>
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        <PersonNm>PETER KARIS</PersonNm>
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        <PersonNm>ROBERT K ANDERBERG</PersonNm>
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        <PersonNm>SAMAYLA DEUTCH</PersonNm>
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        <PersonNm>TALLY BLUMBERG</PersonNm>
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        <PersonNm>BRADFORD BURNS</PersonNm>
        <TitleTxt>STAFF ATTORNEY</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>LESLEY KANE SZYNAL</PersonNm>
        <TitleTxt>DIRECTOR OF OUTDOORS AMERICA</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>38.00</AverageHoursPerWeekRltdOrgRt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>MELANIE GRIFFIN</PersonNm>
        <TitleTxt>SR. DIR OF INSTITUTIONAL GIVING</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>38.00</AverageHoursPerWeekRltdOrgRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
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      <Form990PartVIISectionAGrp>
        <PersonNm>MICHAEL BADEN</PersonNm>
        <TitleTxt>SR. DIR OF ADMINISTRATION</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>REBEKAH GERARD</PersonNm>
        <TitleTxt>SR. DIR OF ADMIN (OUTGOING 12/24)</TitleTxt>
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      <CompensationFromOtherSrcsInd>0</CompensationFromOtherSrcsInd>
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          <BusinessName>
            <BusinessNameLine1Txt>CUTTING EDGE GROUP LLC</BusinessNameLine1Txt>
          </BusinessName>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>3836 ALKIRE RD</AddressLine1Txt>
            <CityNm>GROVE CITY</CityNm>
            <StateAbbreviationCd>OH</StateAbbreviationCd>
            <ZIPCd>43123</ZIPCd>
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        <ServicesDesc>CONSTRUCTION SERVICES</ServicesDesc>
        <CompensationAmt>562672</CompensationAmt>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>MORGAN LEWIS BOCKIUS LLP</BusinessNameLine1Txt>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>101 PARK AVE</AddressLine1Txt>
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            <StateAbbreviationCd>NY</StateAbbreviationCd>
            <ZIPCd>10178</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>LEGAL SERVICES</ServicesDesc>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>ALAN FRONT</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>PO BOX 625</AddressLine1Txt>
            <CityNm>SAN ANSELMO</CityNm>
            <StateAbbreviationCd>CA</StateAbbreviationCd>
            <ZIPCd>94979</ZIPCd>
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        </ContractorAddress>
        <ServicesDesc>CONSULTING SERVICES</ServicesDesc>
        <CompensationAmt>180000</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>BOBBY COX</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>25 MAIN STREET</AddressLine1Txt>
            <CityNm>COOPERSTOWN</CityNm>
            <StateAbbreviationCd>NY</StateAbbreviationCd>
            <ZIPCd>13326</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>CONSTRUCTION SERVICES</ServicesDesc>
        <CompensationAmt>139207</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>SUSAN BLICKSTEIN</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>3 OLD MILL RD</AddressLine1Txt>
            <CityNm>NEW PALTZ</CityNm>
            <StateAbbreviationCd>NY</StateAbbreviationCd>
            <ZIPCd>12561</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>CONSULTING SERVICES</ServicesDesc>
        <CompensationAmt>102230</CompensationAmt>
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      <CntrctRcvdGreaterThan100KCnt>5</CntrctRcvdGreaterThan100KCnt>
      <FundraisingAmt>1225713</FundraisingAmt>
      <RelatedOrganizationsAmt>92762</RelatedOrganizationsAmt>
      <GovernmentGrantsAmt>9425</GovernmentGrantsAmt>
      <AllOtherContributionsAmt>4844566</AllOtherContributionsAmt>
      <NoncashContributionsAmt>291800</NoncashContributionsAmt>
      <TotalContributionsAmt>6172466</TotalContributionsAmt>
      <ProgramServiceRevenueGrp>
        <Desc>MANAGEMENT FEES</Desc>
        <BusinessCd>900099</BusinessCd>
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        <RelatedOrExemptFuncIncomeAmt>242745</RelatedOrExemptFuncIncomeAmt>
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      <ProgramServiceRevenueGrp>
        <Desc>PROJECT REVENUES</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>117167</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>117167</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>SETTLEMENT REVENUE</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>168</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>168</RelatedOrExemptFuncIncomeAmt>
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      <InvestmentIncomeGrp>
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        <ExclusionAmt>334669</ExclusionAmt>
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      <GrossRentsGrp>
        <RealAmt>36344</RealAmt>
      </GrossRentsGrp>
      <LessRentalExpensesGrp>
        <RealAmt>0</RealAmt>
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      <RentalIncomeOrLossGrp>
        <RealAmt>36344</RealAmt>
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      <NetRentalIncomeOrLossGrp>
        <TotalRevenueColumnAmt>36344</TotalRevenueColumnAmt>
        <ExclusionAmt>36344</ExclusionAmt>
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      <GrossAmountSalesAssetsGrp>
        <SecuritiesAmt>122696</SecuritiesAmt>
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      <NetGainOrLossInvestmentsGrp>
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      <FundraisingGrossIncomeAmt>159060</FundraisingGrossIncomeAmt>
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        <BusinessCd>900099</BusinessCd>
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      <OtherRevenueMiscGrp>
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        <BusinessCd>900099</BusinessCd>
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      <InfoInScheduleOPartIXInd>X</InfoInScheduleOPartIXInd>
      <GrantsToDomesticOrgsGrp>
        <TotalAmt>587815</TotalAmt>
        <ProgramServicesAmt>587815</ProgramServicesAmt>
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      <CompCurrentOfcrDirectorsGrp>
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      <FeesForSrvcInvstMgmntFeesGrp>
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        <ManagementAndGeneralAmt>2877</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>95399</ProgramServicesAmt>
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        <FundraisingAmt>10991</FundraisingAmt>
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        <ProgramServicesAmt>39828</ProgramServicesAmt>
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      <OtherExpensesGrp>
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        <ManagementAndGeneralAmt>387</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
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      <OtherExpensesGrp>
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      <OtherExpensesGrp>
        <Desc>PROPERTY MAINTENANCE</Desc>
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        <ProgramServicesAmt>37477</ProgramServicesAmt>
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      <AllOtherExpensesGrp>
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        <CurrentTaxYearMinus2YearsAmt>55</CurrentTaxYearMinus2YearsAmt>
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      <Form990ScheduleAPartVIGrp>
        <FormAndLineReferenceDesc>SCHEDULE A, PART II, LINE 10, EXPLANATION OF OTHER INCOME:</FormAndLineReferenceDesc>
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        </ContributorUSAddress>
        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
      </ContributorInformationGrp>
    </IRS990ScheduleB>
    <IRS990ScheduleC documentId="RetDoc1039600001">
      <OrganizationBelongsAffltGrpInd referenceDocumentId="RetDoc2137600001">X</OrganizationBelongsAffltGrpInd>
      <TotalGrassrootsLobbyingGrp>
        <AffiliatedGroupTotalAmt>148863</AffiliatedGroupTotalAmt>
      </TotalGrassrootsLobbyingGrp>
      <TotalDirectLobbyingGrp>
        <AffiliatedGroupTotalAmt>302873</AffiliatedGroupTotalAmt>
      </TotalDirectLobbyingGrp>
      <TotalLobbyingExpendGrp>
        <AffiliatedGroupTotalAmt>451736</AffiliatedGroupTotalAmt>
      </TotalLobbyingExpendGrp>
      <OtherExemptPurposeExpendGrp>
        <FilingOrganizationsTotalAmt>7597919</FilingOrganizationsTotalAmt>
        <AffiliatedGroupTotalAmt>79120664</AffiliatedGroupTotalAmt>
      </OtherExemptPurposeExpendGrp>
      <TotalExemptPurposeExpendGrp>
        <FilingOrganizationsTotalAmt>7597919</FilingOrganizationsTotalAmt>
        <AffiliatedGroupTotalAmt>79572400</AffiliatedGroupTotalAmt>
      </TotalExemptPurposeExpendGrp>
      <LobbyingNontaxableAmountGrp>
        <FilingOrganizationsTotalAmt>529896</FilingOrganizationsTotalAmt>
        <AffiliatedGroupTotalAmt>1000000</AffiliatedGroupTotalAmt>
      </LobbyingNontaxableAmountGrp>
      <GrassrootsNontaxableGrp>
        <FilingOrganizationsTotalAmt>132474</FilingOrganizationsTotalAmt>
        <AffiliatedGroupTotalAmt>250000</AffiliatedGroupTotalAmt>
      </GrassrootsNontaxableGrp>
      <TotLbbyngGrassrootMnsNonTxGrp>
        <FilingOrganizationsTotalAmt>0</FilingOrganizationsTotalAmt>
        <AffiliatedGroupTotalAmt>0</AffiliatedGroupTotalAmt>
      </TotLbbyngGrassrootMnsNonTxGrp>
      <TotLbbyExpendMnsLbbyngNonTxGrp>
        <FilingOrganizationsTotalAmt>0</FilingOrganizationsTotalAmt>
        <AffiliatedGroupTotalAmt>0</AffiliatedGroupTotalAmt>
      </TotLbbyExpendMnsLbbyngNonTxGrp>
      <AvgLobbyingNontaxableAmountGrp>
        <CurrentYearMinus3Amt>1000000</CurrentYearMinus3Amt>
        <CurrentYearMinus2Amt>1000000</CurrentYearMinus2Amt>
        <CurrentYearMinus1Amt>1000000</CurrentYearMinus1Amt>
        <CurrentYearAmt>1000000</CurrentYearAmt>
        <TotalAmt>4000000</TotalAmt>
      </AvgLobbyingNontaxableAmountGrp>
      <LobbyingCeilingAmt>6000000</LobbyingCeilingAmt>
      <AvgTotalLobbyingExpendGrp>
        <CurrentYearMinus3Amt>270762</CurrentYearMinus3Amt>
        <CurrentYearMinus2Amt>331261</CurrentYearMinus2Amt>
        <CurrentYearMinus1Amt>446001</CurrentYearMinus1Amt>
        <CurrentYearAmt>451736</CurrentYearAmt>
        <TotalAmt>1499760</TotalAmt>
      </AvgTotalLobbyingExpendGrp>
      <AvgGrassrootsNontaxableGrp>
        <CurrentYearMinus3Amt>250000</CurrentYearMinus3Amt>
        <CurrentYearMinus2Amt>250000</CurrentYearMinus2Amt>
        <CurrentYearMinus1Amt>250000</CurrentYearMinus1Amt>
        <CurrentYearAmt>250000</CurrentYearAmt>
        <TotalAmt>1000000</TotalAmt>
      </AvgGrassrootsNontaxableGrp>
      <GrassrootsCeilingAmt>1500000</GrassrootsCeilingAmt>
      <AvgGrassrootsLobbyingExpendGrp>
        <CurrentYearMinus3Amt>120417</CurrentYearMinus3Amt>
        <CurrentYearMinus2Amt>132915</CurrentYearMinus2Amt>
        <CurrentYearMinus1Amt>133705</CurrentYearMinus1Amt>
        <CurrentYearAmt>148863</CurrentYearAmt>
        <TotalAmt>535900</TotalAmt>
      </AvgGrassrootsLobbyingExpendGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART II A - AFFILATED GROUP RETURN STATEMENT</FormAndLineReferenceDesc>
        <ExplanationTxt>PURSUANT TO REGULATIONS SECTION 56.4911-8(B) AND IRC SECTION 4911(F), AN AFFILIATED GROUP OF ORGANIZATIONS IS TREATED AS A SINGLE ORGANIZATION FOR THE PURPOSES OF THE TAX IMPOSED BY IRC SECTION 4911(A). THEREFORE, SINCE THE AFFILIATED GROUP DID NOT HAVE ANY EXCESS LOBBYING EXPENDITURES OR EXCESS GRASSROOTS LOBBYING EXPENDITURES, THE FILING ORGANIZATION IS DEEMED TO NOT HAVE EXCESS LOBBYING EXPENDITURES OR EXCESS GRASSROOTS LOBBYING EXPENDITURES FOR THE PURPOSES OF THE DISCLOSURE ON PART II-A, LINE 1(H) AND 1(I), COLUMN A. AFFILIATED GROUP MEMBER: OPEN SPACE INSTITUTE LAND TRUST, INC. (EIN 13-3028060) 1370 BROADWAY 5TH FLOOR NEW YORK, NY 10018-7799</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleC>
    <IRS990ScheduleD documentId="RetDoc1039900001">
      <PreservationPublicUseInd>X</PreservationPublicUseInd>
      <ProtectionNaturalHabitatInd>X</ProtectionNaturalHabitatInd>
      <PreservationOpenSpaceInd>X</PreservationOpenSpaceInd>
      <HistoricLandAreaInd>X</HistoricLandAreaInd>
      <TotalEasementsCnt>5</TotalEasementsCnt>
      <TotalAcreageCnt>34.23</TotalAcreageCnt>
      <StatesEasementsHeldCnt>1</StatesEasementsHeldCnt>
      <WrittenPolicyMonitoringInd>1</WrittenPolicyMonitoringInd>
      <StaffHoursSpentEnforcementCnt>10.00</StaffHoursSpentEnforcementCnt>
      <ExpensesIncurredEnforcementAmt>569</ExpensesIncurredEnforcementAmt>
      <CYEndwmtFundGrp>
        <BeginningYearBalanceAmt>1215353</BeginningYearBalanceAmt>
        <InvestmentEarningsOrLossesAmt>115183</InvestmentEarningsOrLossesAmt>
        <GrantsOrScholarshipsAmt>65000</GrantsOrScholarshipsAmt>
        <EndYearBalanceAmt>1265535</EndYearBalanceAmt>
      </CYEndwmtFundGrp>
      <CYMinus1YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>1143418</BeginningYearBalanceAmt>
        <InvestmentEarningsOrLossesAmt>140435</InvestmentEarningsOrLossesAmt>
        <GrantsOrScholarshipsAmt>68500</GrantsOrScholarshipsAmt>
        <EndYearBalanceAmt>1215353</EndYearBalanceAmt>
      </CYMinus1YrEndwmtFundGrp>
      <CYMinus2YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>1493502</BeginningYearBalanceAmt>
        <InvestmentEarningsOrLossesAmt>-283084</InvestmentEarningsOrLossesAmt>
        <GrantsOrScholarshipsAmt>67000</GrantsOrScholarshipsAmt>
        <EndYearBalanceAmt>1143418</EndYearBalanceAmt>
      </CYMinus2YrEndwmtFundGrp>
      <CYMinus3YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>1426100</BeginningYearBalanceAmt>
        <InvestmentEarningsOrLossesAmt>67402</InvestmentEarningsOrLossesAmt>
        <EndYearBalanceAmt>1493502</EndYearBalanceAmt>
      </CYMinus3YrEndwmtFundGrp>
      <CYMinus4YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>1302869</BeginningYearBalanceAmt>
        <InvestmentEarningsOrLossesAmt>123231</InvestmentEarningsOrLossesAmt>
        <EndYearBalanceAmt>1426100</EndYearBalanceAmt>
      </CYMinus4YrEndwmtFundGrp>
      <TermEndowmentBalanceEOYPct>1.00000</TermEndowmentBalanceEOYPct>
      <EndowmentsHeldUnrelatedOrgInd>0</EndowmentsHeldUnrelatedOrgInd>
      <EndowmentsHeldRelatedOrgInd>1</EndowmentsHeldRelatedOrgInd>
      <RelatedOrgListSchRInd>1</RelatedOrgListSchRInd>
      <LandGrp>
        <OtherCostOrOtherBasisAmt>3122414</OtherCostOrOtherBasisAmt>
        <BookValueAmt>3122414</BookValueAmt>
      </LandGrp>
      <BuildingsGrp>
        <OtherCostOrOtherBasisAmt>669545</OtherCostOrOtherBasisAmt>
        <BookValueAmt>669545</BookValueAmt>
      </BuildingsGrp>
      <LeaseholdImprovementsGrp>
        <OtherCostOrOtherBasisAmt>3452352</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>3173039</DepreciationAmt>
        <BookValueAmt>279313</BookValueAmt>
      </LeaseholdImprovementsGrp>
      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>474620</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>142899</DepreciationAmt>
        <BookValueAmt>331721</BookValueAmt>
      </EquipmentGrp>
      <OtherLandBuildingsGrp>
        <OtherCostOrOtherBasisAmt>853882</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>360490</DepreciationAmt>
        <BookValueAmt>493392</BookValueAmt>
      </OtherLandBuildingsGrp>
      <TotalBookValueLandBuildingsAmt>4896385</TotalBookValueLandBuildingsAmt>
      <OtherAssetsOrgGrp>
        <Desc>OPERATING LEASE ASSETS</Desc>
        <BookValueAmt>9754362</BookValueAmt>
      </OtherAssetsOrgGrp>
      <TotalBookValueOtherAssetsAmt>9754362</TotalBookValueOtherAssetsAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>SECURITY DEPOSITS PAYABLE</Desc>
        <Amt>6057</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>OPERATING LEASE LIABILITIES</Desc>
        <Amt>10865740</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>10871797</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>88103661</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>81108</NetUnrealizedGainsInvstAmt>
      <OtherRevenueAmt>81164281</OtherRevenueAmt>
      <RevenueNotReportedAmt>81245389</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>6858272</RevenueSubtotalAmt>
      <RevenueNotReportedFinclStmtAmt>0</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>6858272</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>78931329</TotExpnsEtcAuditedFinclStmtAmt>
      <OtherExpensesIncludedAmt>75278633</OtherExpensesIncludedAmt>
      <ExpensesNotReportedAmt>75278633</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>3652696</ExpensesSubtotalAmt>
      <OtherExpensesNotIncludedAmt>3264</OtherExpensesNotIncludedAmt>
      <ExpensesNotRptFinclStmtAmt>3264</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>3655960</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART II, LINE 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>PURCHASED EASEMENTS THAT HAVE A RESALE VALUE ARE RECORDED AT THE LOWER OF COST OR FAIR MARKET VALUE. DONATED EASEMENTS THAT HAVE A RESALE VALUE ARE RECORDED AT THE LOWER OF THE DONATED VALUE OR FAIR MARKET VALUE. CONSERVATION EASEMENTS DETERMINED BY OSI TO HAVE NO RESALE VALUE ARE WRITTEN DOWN TO A $1 CARRYING VALUE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART V, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE MALCOLM GORDON CHARITABLE ENDOWMENT FUNDS WERE CLASSIFIED AS TEMPORARILY RESTRICTED BECAUSE THE GRANTOR WHO ESTABLISHED THE TRUST REQUIRED THAT THE FUNDS BE DEVOTED TO ENVIRONMENTAL EDUCATION GRANTS. AFTER THE TRUST WAS DISSOLVED IN AUGUST 2012, THE ORGANIZATION CONTINUED TO CONSIDER THESE FUNDS TO BE TEMPORARILY RESTRICTED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION BELIEVES IT HAD NO UNCERTAIN TAX POSITIONS AS OF DECEMBER 31, 2024 AND 2023 IN ACCORDANCE WITH FASB ASC TOPIC 740, "INCOME TAXES," WHICH PROVIDES STANDARDS FOR ESTABLISHING AND CLASSIFYING ANY TAX PROVISIONS FOR UNCERTAIN TAX POSITIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XI, LINE 2D - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>RELATED ENTITIES' REVENUE 81,511,052. CONSOLIDATING ELIMINATIONS -343,507. UBTI NETTED AGAINST REVENUE -3,264.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XII, LINE 2D - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>RELATED ENTITIES' EXPENSES 71,680,181. CONSOLIDATING ELIMINATIONS -343,507. TIMING DIFFERENCES ON LAND DONATIONS 3,941,959.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XII, LINE 4B - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>UBIT NETTED AGAINST REVENUE 3,264.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleG documentId="RetDoc1041300001">
      <FundraisingEventInformationGrp>
        <Event1Nm>50TH ANNIVERSARY GALA</Event1Nm>
        <GrossReceiptsEvent1Amt>1384773</GrossReceiptsEvent1Amt>
        <CharitableContriEvent1Amt>1225713</CharitableContriEvent1Amt>
        <GrossRevenueEvent1Amt>159060</GrossRevenueEvent1Amt>
        <RentFacilityCostsEvent1Amt>210007</RentFacilityCostsEvent1Amt>
        <FoodAndBeverageEvent1Amt>42140</FoodAndBeverageEvent1Amt>
        <OtherDirectExpensesEvent1Amt>77961</OtherDirectExpensesEvent1Amt>
        <GrossReceiptsTotalAmt>1384773</GrossReceiptsTotalAmt>
        <CharitableContributionsTotAmt>1225713</CharitableContributionsTotAmt>
        <GrossRevenueTotalEventsAmt>159060</GrossRevenueTotalEventsAmt>
        <RentFcltyCostsTotalEventsAmt>210007</RentFcltyCostsTotalEventsAmt>
        <FoodAndBeverageTotalEventsAmt>42140</FoodAndBeverageTotalEventsAmt>
        <OthDirectExpnssTotalEventsAmt>77961</OthDirectExpnssTotalEventsAmt>
        <DirectExpenseSummaryEventsAmt>330108</DirectExpenseSummaryEventsAmt>
        <NetIncomeSummaryAmt>-171048</NetIncomeSummaryAmt>
      </FundraisingEventInformationGrp>
    </IRS990ScheduleG>
    <IRS990ScheduleI documentId="RetDoc1041900001">
      <GrantRecordsMaintainedInd>1</GrantRecordsMaintainedInd>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>ARM OF THE SEA PRODUCTIONS INC</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>PO BOX 175</AddressLine1Txt>
          <CityNm>MALDENONHUDSON</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>12453</ZIPCd>
        </USAddress>
        <RecipientEIN>141745940</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>7000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>MALCOLM GORDON CHARITABLE FUND</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>BEAVERKILL VALLEY LAND TRUST INC</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>1532 BEAVERKILL ROAD</AddressLine1Txt>
          <CityNm>LIVINGSTON MANOR</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>12758</ZIPCd>
        </USAddress>
        <RecipientEIN>133545322</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>72292</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>STEWARDSHIP</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>BRIARCLIFF MANOR-SCARBOROUGH HISTORICAL SOCIETY</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>1 LIBRARY ROAD</AddressLine1Txt>
          <CityNm>BRIARCLIFF MANOR</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10510</ZIPCd>
        </USAddress>
        <RecipientEIN>133059190</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>6000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>MCHENRY HUDSON RIVER VALLEY AWARDS</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>ECOLOGICAL CITIZENS PROJECT INC</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>69 S MOUNTAIN PASS</AddressLine1Txt>
          <CityNm>GARRISON</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10524</ZIPCd>
        </USAddress>
        <RecipientEIN>812903289</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>7000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>MALCOLM GORDON CHARITABLE FUND</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>GOOD WORK INSTITUTE INC</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>65 ST JAMES STREET</AddressLine1Txt>
          <CityNm>KINGSTON</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>12401</ZIPCd>
        </USAddress>
        <RecipientEIN>473091614</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>6000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>MALCOLM GORDON CHARITABLE FUND</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>HUDSN RVR SLOOP CLEARWATER INC</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>724 WOLCOTT AVENUE</AddressLine1Txt>
          <CityNm>BEACON</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>12508</ZIPCd>
        </USAddress>
        <RecipientEIN>146049022</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>6000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>MALCOLM GORDON CHARITABLE FUND</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>LAND TO LEARN</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>380 MAIN STREET</AddressLine1Txt>
          <CityNm>BEACON</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>12508</ZIPCd>
        </USAddress>
        <RecipientEIN>463267308</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>10000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>MALCOLM GORDON CHARITABLE FUND</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>NEWBURGH URBAN FARM AND FOOD INC</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>PO BOX 541</AddressLine1Txt>
          <CityNm>NEWBURGH</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>12551</ZIPCd>
        </USAddress>
        <RecipientEIN>834185589</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>10000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>MALCOLM GORDON CHARITABLE FUND</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>OUTDOOR PROMISE</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>217 LIBERTY STREET 1465</AddressLine1Txt>
          <CityNm>NEWBURGH</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>12551</ZIPCd>
        </USAddress>
        <RecipientEIN>462901973</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>7000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>MALCOLM GORDON CHARITABLE FUND</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>POUGHKEEPSIE FARM PROJECT</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>PO BOX 3143</AddressLine1Txt>
          <CityNm>POUGHKEEPSIE</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>12603</ZIPCd>
        </USAddress>
        <RecipientEIN>141813679</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>6000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>MALCOLM GORDON CHARITABLE FUND</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>SARATOGA PLAN INC</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>112 SPRING STREET ROOM 202</AddressLine1Txt>
          <CityNm>SARATOGA SPRINGS</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>12866</ZIPCd>
        </USAddress>
        <RecipientEIN>141706013</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>6000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>MCHENRY HUDSON RIVER VALLEY AWARDS</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>SPIRAL HOUSE PARK</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>185 FISHCREEK RD</AddressLine1Txt>
          <CityNm>SAUGERTIES</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>12477</ZIPCd>
        </USAddress>
        <RecipientEIN>993247180</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>356374</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>CITIZEN ACTION PROGRAM</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>STONY KILL FOUNDATION INC</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>79 FARMSTEAD LANE</AddressLine1Txt>
          <CityNm>WAPPINGERS FALLS</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>12590</ZIPCd>
        </USAddress>
        <RecipientEIN>132917536</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>6000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>MALCOLM GORDON CHARITABLE FUND</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>THE FREEDOM FOOD ALLIANCE INC</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>4872 STATE ROUTE 9G</AddressLine1Txt>
          <CityNm>GERMANTOWN</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>12526</ZIPCd>
        </USAddress>
        <RecipientEIN>813383624</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>6000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>MCHENRY HUDSON RIVER VALLEY AWARDS</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>THE FULLERTON MANSION CENTER FOR CULTURE AND HISTORY</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>297 GRAND STREET</AddressLine1Txt>
          <CityNm>NEWBURGH</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>12550</ZIPCd>
        </USAddress>
        <RecipientEIN>464144016</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>6000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>MCHENRY HUDSON RIVER VALLEY AWARDS</PurposeOfGrantTxt>
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      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>THE RELATO AGENCY LLC</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>185 MACKENZIE LN</AddressLine1Txt>
          <CityNm>FAYETTEVILLE</CityNm>
          <StateAbbreviationCd>GA</StateAbbreviationCd>
          <ZIPCd>30214</ZIPCd>
        </USAddress>
        <RecipientEIN>920269349</RecipientEIN>
        <CashGrantAmt>29219</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>CITIZEN ACTION PROGRAM</PurposeOfGrantTxt>
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      <RecipientTable>
        <RecipientBusinessName>
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        <USAddress>
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          <CityNm>NEW PALTZ</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>12561</ZIPCd>
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        <RecipientEIN>222867070</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
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        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>MCHENRY HUDSON RIVER VALLEY AWARDS</PurposeOfGrantTxt>
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      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>TWO EVERGREEN MACHINE LLC</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>210 COOK ST APT 308</AddressLine1Txt>
          <CityNm>BROOKLYN</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>11206</ZIPCd>
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        <RecipientEIN>854382428</RecipientEIN>
        <CashGrantAmt>18514</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>CITIZEN ACTION PROGRAM</PurposeOfGrantTxt>
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      <RecipientTable>
        <RecipientBusinessName>
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        <USAddress>
          <AddressLine1Txt>124 RAYMOND AVENUE</AddressLine1Txt>
          <CityNm>POUGHKEEPSIE</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>12604</ZIPCd>
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        <RecipientEIN>141338587</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>7000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>MCHENRY HUDSON RIVER VALLEY AWARDS</PurposeOfGrantTxt>
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      <Total501c3OrgCnt>18</Total501c3OrgCnt>
      <TotalOtherOrgCnt>2</TotalOtherOrgCnt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>GRANTEES EXECUTE A WRITTEN AGREEMENT WHICH REQUIRES THEM TO SUBMIT WRITTEN REPORTS TO OSI FOR THE PERIOD OF THE AGREEMENT. TWO EVERGREEN MACHINE LLC , SPIRAL HOUSE PARK AND RELATO AGENCY LLC ARE FISCALLY SPONSORED BY THE OPEN SPACE INSTITUTE, INC., AS PART OF THE CITIZEN ACTION PROGRAM. THE CITIZEN ACTION PROGRAM FURTHER ENHANCES OSI'S MISSION BY WORKING WITH GROUPS THAT ARE MAKING COMMUNITIES MORE LIVABLE AND ACCESSIBLE, EDUCATING AND COMMUNICATING ABOUT THE ENVIRONMENT, PROTECTING HISTORIC AND NATURAL RESOURCES, AND MAKING OUTDOOR RECREATION SAFER AND MORE WELCOMING FOR ALL.</ExplanationTxt>
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    </IRS990ScheduleI>
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      <SeverancePaymentInd>1</SeverancePaymentInd>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>NICK RICHARDSON</PersonNm>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>PETER KARIS</PersonNm>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>REBEKAH GERARD</PersonNm>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>IRENE LEE</PersonNm>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>ABIGAIL WEINBERG</PersonNm>
        <TitleTxt>VP OF SCIENCE &amp; CONSERVATION POLICY</TitleTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DAVID KIERAN-KAUFMAN</PersonNm>
        <TitleTxt>VICE PRESIDENT AND ASSISTANT GENERAL</TitleTxt>
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        <DeferredCompensationFlngOrgAmt>12000</DeferredCompensationFlngOrgAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MAY MAY CHENG</PersonNm>
        <TitleTxt>VICE PRESIDENT, CONTROLLER</TitleTxt>
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        <TotalCompensationFilingOrgAmt>203186</TotalCompensationFilingOrgAmt>
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      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>JESSICA WATSON</PersonNm>
        <TitleTxt>VP OF CONSERVATION COMMUNITIES</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>12000</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
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        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MICHAEL BADEN</PersonNm>
        <TitleTxt>SR. DIR OF ADMINISTRATION</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>BRADFORD BURNS</PersonNm>
        <TitleTxt>STAFF ATTORNEY</TitleTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MELANIE GRIFFIN</PersonNm>
        <TitleTxt>SR. DIR OF INSTITUTIONAL GIVING</TitleTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 4A</FormAndLineReferenceDesc>
        <ExplanationTxt>DURING THE TAX YEAR 2024, THE OPEN SPACE INSTITUTE PAID SEVERANCE TO REBEKAH GERARD SENIOR DIRECTOR OF ADMINISTRATION IN THE AMOUNT OF $ 37,917. THIS PAYMENT WAS PROVIDED IN ACCORDANCE WITH THE ORGANIZATION'S ESTABLISHED SEVERANCE POLICY AND/OR CONTRACTUAL OBLIGATIONS RESULTING FROM RESIGNATION DATED 24TH DECEMBER 2024. THE SEVERANCE ARRANGEMENT WAS APPROVED BY THE BOARD OF DIRECTORS IN COMPLIANCE WITH THE ORGANIZATION'S COMPENSATION APPROVAL PROCESS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 7</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BONUS OF THE CEO/PRESIDENT DISPLAYED ON SCHEDULE J, PART II, COLUMN B(II) WAS REVIEWED AND ESTABLISHED BY THE COMPENSATION COMMITTEE AS PART OF THE CEO/PRESIDENT'S ANNUAL PERFORMANCE REVIEW BY THE COMPENSATION COMMITTEE. OTHER BONUSES WERE APPROVED BY THE CEO/PRESIDENT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART II COLUMN B(III)</FormAndLineReferenceDesc>
        <ExplanationTxt>PART II, COLUMN B(III) FOR SOME INDIVIDUALS INCLUDES CONTRIBUTIONS TO 457(B) RETIREMENT PLAN. THE OTHER AMOUNTS INCLUDED IN THIS COLUMN ARE GROUP TERM LIFE INSURANCE.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleM documentId="RetDoc1042900001">
      <SecuritiesPubliclyTradedGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>7</ContributionCnt>
        <NoncashContributionsRptF990Amt>291800</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FMV</MethodOfDeterminingRevenuesTxt>
      </SecuritiesPubliclyTradedGrp>
      <AnyPropertyThatMustBeHeldInd>0</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>1</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>0</ThirdPartiesUsedInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, COLUMN (B):</FormAndLineReferenceDesc>
        <ExplanationTxt>THE NUMBER IN COLUMN(B) REPRESENTS NUMBER OF CONTRIBUTIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 1A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BOARD OF TRUSTEES OF OSI DELEGATES TO THE EXECUTIVE COMMITTEE OF THE BOARD THE POWER TO TAKE ANY ACTION IN BETWEEN REGULAR MEETINGS OF THE BOARD THAT COULD OTHERWISE BE TAKEN BY THE FULL BOARD. THE EXECUTIVE COMMITTEE IS REQUIRED TO REPORT TO THE FULL BOARD ON ANY ACTIONS TAKEN BY THE EXECUTIVE COMMITTEE AT THE NEXT REGULAR MEETING OF THE FULL BOARD.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>OUR 990 IS PREPARED BY AN OUTSIDE INDEPENDENT ACCOUNTING FIRM. THE DRAFT FORM 990 IS REVIEWED BY THE CONTROLLER, CHIEF FINANCIAL OFFICER &amp; GENERAL COUNSEL. AFTER STAFF REVIEW THE RETURN IT IS THEN REVIEWED BY THE AUDIT COMMITTEE. THE REVIEWED AND CORRECTED 990 FORM IS THEN SENT OUT TO ALL THE BOARD MEMBERS OF THE ORGANIZATION FOR THEIR REVIEW AND COMMENTS. THE RETURN IS FILED ONCE ALL PARTIES HAVE COMPLETED THEIR REVIEW AND REQUIRED EDITS HAVE BEEN MADE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>OPEN SPACE INSTITUTE, INC. HAS A CONFLICT OF INTEREST POLICY WHICH REQUIRES ALL INTERESTED PERSONS TO DISCLOSE CONFLICTS AND POTENTIAL CONFLICTS AS SOON AS THEY ARISE. A CONFLICTED PARTY MAY NOT DISCUSS THE TRANSACTION THAT IS THE BASIS OF SUCH CONFLICT, AND MUST RECUSE THEMSELVES FROM ANY DISCUSSION OR VOTE ON SUCH TRANSACTION. THE PRESIDENT EACH YEAR REPORTS TO THE BOARD OF TRUSTEES ALL CONFLICT TRANSACTIONS AND HOW THEY WERE HANDLED. THE BOARD OF OPEN SPACE INSTITUTE, INC. HAS THE POWER TO TAKE REMEDIAL ACTION IF THE CONFLICT POLICY IS VIOLATED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>THE PROCESS OF DETERMINING COMPETITIVE COMPENSATION FOR TOP MANAGEMENT AND KEY EMPLOYEES INVOLVES OSI'S COMPENSATION COMMITTEE REFERENCING REASONABLE AND COMPETITIVE SALARY RATE INFORMATION PROVIDED BY AN INDEPENDENT COMPENSATION CONSULTANT. THE COMPENSATION COMMITTEE PERFORMS AN ANNUAL ASSESSMENT OF THE RESPONSIBILITIES AND PERFORMANCE OF THE CEO/PRESIDENT AND ESTABLISHES THE CEO/PRESIDENT'S COMPENSATION AND BONUS. ANNUAL PERFORMANCE REVIEWS OF POSITIONS REPORTING TO THE CEO/PRESIDENT ARE CONDUCTED BY THE CEO/PRESIDENT AND THEN PRESENTED TO THE COMPENSATION COMMITTEE FOR ITS REVIEW TO ENSURE CONSISTENCY WITH LAW BEST PRACTICE AND THE COMPANY'S COMPENSATION POLICY. THE COMPENSATION COMMITTEE THEN REVIEWS AND APPROVES ANY INCREASE IN THE TOTAL ANNUAL SALARY BUDGET FOR THE UPCOMING YEAR BASED UPON THE RECOMMENDATION OF THE CEO/PRESIDENT USING THE INFORMATION PROVIDED BY THE INDEPENDENT COMPENSATION CONSULTANT AND PERFORMANCE REVIEWS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>OPEN SPACE INSTITUTE, INC. MAKES ITS GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, WHISTLEBLOWER POLICY, DOCUMENT RETENTION AND DESTRUCTION POLICY AND FINANCIAL STATEMENTS AVAILABLE TO THE GENERAL PUBLIC. THESE DOCUMENTS ARE SENT TO ANYONE WHO CONTACTS THE ORGANIZATION AND REQUESTS SUCH INFORMATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART IX, LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>PROFESSIONAL FEES: PROGRAM SERVICE EXPENSES 447,337. MANAGEMENT AND GENERAL EXPENSES 24,368. FUNDRAISING EXPENSES 49,066. TOTAL EXPENSES 520,771.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>TIMING DIFFERENCES ON LAND DONATIONS -3,941,959.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XII, LINE 2C:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE PROCESS HAS NOT CHANGED FROM THE PRIOR YEAR.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9</FormAndLineReferenceDesc>
        <ExplanationTxt>AS PART OF ITS CONSERVATION EFFORTS, OSI MAY DONATE LAND TO CONSERVATION AGENCIES OR SELL IT AT BELOW MARKET VALUE. IN CASES WHERE AN OBLIGATION OR INTENT EXISTS TO DO SO, GRANT EXPENSE IS ACCRUED TO RECOGNIZE THE AMOUNT OF THE FUTURE DONATION FOR FINANCIAL STATEMENT PURPOSES. HOWEVER, GRANTS OF LAND ARE NOT RECOGNIZED ON FORM 990 SCHEDULE I UNTIL THEY OCCUR. THIS WILL RESULT IN A RECONCILING DIFFERENCE ON SCHEDULE D OF THE IRS FORM 990, AS ONLY COMPLETED DONATIONS ARE REPORTED ON THE FORM 990.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
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        <DisregardedEntityName>
          <BusinessNameLine1Txt>OPEN SPACE INSTITUTE LAND TRUST INC</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>1370 BROADWAY 5TH FLOOR</AddressLine1Txt>
          <CityNm>NEW YORK</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10018</ZIPCd>
        </USAddress>
        <EIN>133028060</EIN>
        <PrimaryActivitiesTxt>LAND CONSERVATION</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>NY</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(C)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>LINE 12A, I</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>OPEN SPACE INSTITUTE INC</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>1</ControlledOrganizationInd>
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      <IdRelatedOrgTxblPartnershipGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>STRATEGIC CONSERVATION PARTNERS LLC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>1370 BROADWAY 5TH FLOOR</AddressLine1Txt>
          <CityNm>NEW YORK</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
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