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        <TotalAmt>6979</TotalAmt>
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        <EOYAmt>29650348</EOYAmt>
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        <EOYAmt>30822823</EOYAmt>
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      <AccountsPayableAccrExpnssGrp>
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        <EOYAmt>0</EOYAmt>
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      <DeferredRevenueGrp>
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        <EOYAmt>3014</EOYAmt>
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      <TotalLiabilitiesGrp>
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        <EOYAmt>3014</EOYAmt>
      </TotalLiabilitiesGrp>
      <OrganizationFollowsFASB117Ind>X</OrganizationFollowsFASB117Ind>
      <NoDonorRestrictionNetAssetsGrp>
        <BOYAmt>277398</BOYAmt>
        <EOYAmt>560482</EOYAmt>
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      <DonorRestrictionNetAssetsGrp>
        <BOYAmt>10364527</BOYAmt>
        <EOYAmt>30259327</EOYAmt>
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      <TotalNetAssetsFundBalanceGrp>
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        <EOYAmt>30819809</EOYAmt>
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      <TotLiabNetAssetsFundBalanceGrp>
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      <ReconcilationRevenueExpnssAmt>20177884</ReconcilationRevenueExpnssAmt>
      <InfoInScheduleOPartXIIInd>X</InfoInScheduleOPartXIIInd>
      <MethodOfAccountingCashInd>X</MethodOfAccountingCashInd>
      <AccountantCompileOrReviewInd>false</AccountantCompileOrReviewInd>
      <FSAuditedInd>true</FSAuditedInd>
      <FSAuditedBasisGrp>
        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
      </FSAuditedBasisGrp>
      <AuditCommitteeInd>true</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>false</FederalGrantAuditRequiredInd>
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      <OtherSupportSumAmt>0</OtherSupportSumAmt>
      <PublicSupportCY170Pct>0</PublicSupportCY170Pct>
      <GiftsGrantsContrisRcvd509Grp>
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        <CurrentTaxYearMinus3YearsAmt>49146</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>48913</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>261118</CurrentTaxYearMinus1YearAmt>
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      <GrossReceiptsAdmissionsGrp>
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        <CurrentTaxYearMinus3YearsAmt>4002</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>3933</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>4403</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>1650</CurrentTaxYearAmt>
        <TotalAmt>18780</TotalAmt>
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      <GrossReceiptsNonUnrltBusGrp>
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      <TaxRevLeviedOrgnztnlBnft509Grp>
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      <Total509Grp>
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        <CurrentTaxYearMinus3YearsAmt>53148</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>52846</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>265521</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>1636389</CurrentTaxYearAmt>
        <TotalAmt>2074316</TotalAmt>
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      <AmountsRcvdDsqlfyPersonGrp>
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      <SubstantialContributorsAmtGrp>
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      <PublicSupportTotal509Amt>2074316</PublicSupportTotal509Amt>
      <GrossInvestmentIncome509Grp>
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        <CurrentTaxYearMinus1YearAmt>21833</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>71257</CurrentTaxYearAmt>
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      <InvestmentIncomeAndUBTIGrp>
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        <CurrentTaxYearMinus1YearAmt>21833</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>71257</CurrentTaxYearAmt>
        <TotalAmt>108948</TotalAmt>
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      <TotalSupportCalendarYearGrp>
        <TotalAmt>2183264</TotalAmt>
      </TotalSupportCalendarYearGrp>
      <PublicSupportCY509Pct>0.95010</PublicSupportCY509Pct>
      <PublicSupportPY509Pct>0.92040</PublicSupportPY509Pct>
      <InvestmentIncomeCYPct>0.04990</InvestmentIncomeCYPct>
      <InvestmentIncomePYPct>0.07960</InvestmentIncomePYPct>
      <ThirtyThrPctSuprtTestsCY509Ind>X</ThirtyThrPctSuprtTestsCY509Ind>
    </IRS990ScheduleA>
    <IRS990ScheduleB documentId="IRS990ScheduleB-01">
      <ContributorInformationGrp>
        <ContributorNum>RESTRICTED</ContributorNum>
        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
        </ContributorUSAddress>
        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
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      <ProtectionNaturalHabitatInd>X</ProtectionNaturalHabitatInd>
      <WrittenPolicyMonitoringInd>true</WrittenPolicyMonitoringInd>
      <Section170hRqrStsfdInd>true</Section170hRqrStsfdInd>
      <CYEndwmtFundGrp>
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        <EndYearBalanceAmt>10892</EndYearBalanceAmt>
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      <CYMinus1YrEndwmtFundGrp>
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        <EndYearBalanceAmt>10892</EndYearBalanceAmt>
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      <CYMinus2YrEndwmtFundGrp>
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        <InvestmentEarningsOrLossesAmt>-1752</InvestmentEarningsOrLossesAmt>
        <EndYearBalanceAmt>10892</EndYearBalanceAmt>
      </CYMinus2YrEndwmtFundGrp>
      <CYMinus3YrEndwmtFundGrp>
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        <InvestmentEarningsOrLossesAmt>272</InvestmentEarningsOrLossesAmt>
        <EndYearBalanceAmt>12644</EndYearBalanceAmt>
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        <InvestmentEarningsOrLossesAmt>406</InvestmentEarningsOrLossesAmt>
        <EndYearBalanceAmt>12372</EndYearBalanceAmt>
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      <EndowmentsHeldUnrelatedOrgInd>false</EndowmentsHeldUnrelatedOrgInd>
      <EndowmentsHeldRelatedOrgInd>false</EndowmentsHeldRelatedOrgInd>
      <LandGrp>
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        <BookValueAmt>0</BookValueAmt>
      </LandGrp>
      <EquipmentGrp>
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        <DepreciationAmt>5434</DepreciationAmt>
        <BookValueAmt>4536</BookValueAmt>
      </EquipmentGrp>
      <TotalBookValueLandBuildingsAmt>4536</TotalBookValueLandBuildingsAmt>
      <OtherAssetsOrgGrp>
        <Desc>Conservation easements</Desc>
        <BookValueAmt>29458354</BookValueAmt>
      </OtherAssetsOrgGrp>
      <OtherAssetsOrgGrp>
        <Desc>Preserve properties</Desc>
        <BookValueAmt>191994</BookValueAmt>
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      <TotalRevEtcAuditedFinclStmtAmt>20432646</TotalRevEtcAuditedFinclStmtAmt>
      <RevenueSubtotalAmt>20432646</RevenueSubtotalAmt>
      <TotalRevenuePerForm990Amt>20432646</TotalRevenuePerForm990Amt>
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      <ExpensesSubtotalAmt>254762</ExpensesSubtotalAmt>
      <TotalExpensesPerForm990Amt>254762</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt II, Line 9</FormAndLineReferenceDesc>
        <ExplanationTxt>Conservation easements are not recorded as assets on the balance sheet. Property rights granted to the organization are restricted, cannot be sold, and convey only the right to restrict the use and development of land not owned by the organization.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt II, Line 5</FormAndLineReferenceDesc>
        <ExplanationTxt>Monitoring is a program of regularly inspecting and documenting the conditions of an easement to ensure conservation values are protected. Terms and conditions of the conservation easement are always consistent. Every easement has its own terms and conditions.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt V, Line 4</FormAndLineReferenceDesc>
        <ExplanationTxt>The endowment provides funding for stewardship of fee title properties.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
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      <GrantRecordsMaintainedInd>true</GrantRecordsMaintainedInd>
    </IRS990ScheduleI>
    <IRS990ScheduleO documentId="IRS990ScheduleO-01" softwareId="24020153">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>The Board of Directors review the Form 990 before it is finalized.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 15a</FormAndLineReferenceDesc>
        <ExplanationTxt>Governing documents are made available to the public upon request.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 15a</FormAndLineReferenceDesc>
        <ExplanationTxt>The Board of Directors review comparable salaries in the area.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt XII, Line 2c</FormAndLineReferenceDesc>
        <ExplanationTxt>The Finance Committee reviews the audited financial statements prior to being finalized.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>