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      <Form990PartVIISectionAGrp>
        <PersonNm>LISA VERNEGAARD UNTIL 823</PersonNm>
        <TitleTxt>OUTGOING EXECUTIVE DIRECTOR</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>114361</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>4609</OtherCompensationAmt>
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      <TotalReportableCompFromOrgAmt>189442</TotalReportableCompFromOrgAmt>
      <TotReportableCompRltdOrgAmt>0</TotReportableCompRltdOrgAmt>
      <TotalOtherCompensationAmt>5682</TotalOtherCompensationAmt>
      <IndivRcvdGreaterThan100KCnt>1</IndivRcvdGreaterThan100KCnt>
      <FormerOfcrEmployeesListedInd>0</FormerOfcrEmployeesListedInd>
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      <CntrctRcvdGreaterThan100KCnt>0</CntrctRcvdGreaterThan100KCnt>
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      <TotalContributionsAmt>1360654</TotalContributionsAmt>
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        <Desc>FEES FOR SERVICES</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>8266</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>8266</RelatedOrExemptFuncIncomeAmt>
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      <TotalProgramServiceRevenueAmt>8266</TotalProgramServiceRevenueAmt>
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        <RealAmt>41936</RealAmt>
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      <LessRentalExpensesGrp>
        <RealAmt>0</RealAmt>
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      <RentalIncomeOrLossGrp>
        <RealAmt>41936</RealAmt>
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      <NetRentalIncomeOrLossGrp>
        <TotalRevenueColumnAmt>41936</TotalRevenueColumnAmt>
        <ExclusionAmt>41936</ExclusionAmt>
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        <SecuritiesAmt>60476</SecuritiesAmt>
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        <SecuritiesAmt>60316</SecuritiesAmt>
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      <NetGainOrLossInvestmentsGrp>
        <TotalRevenueColumnAmt>160</TotalRevenueColumnAmt>
        <ExclusionAmt>160</ExclusionAmt>
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      <ContriRptFundraisingEventAmt>128312</ContriRptFundraisingEventAmt>
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      <NetIncmFromFundraisingEvtGrp>
        <TotalRevenueColumnAmt>-14650</TotalRevenueColumnAmt>
        <ExclusionAmt>-14650</ExclusionAmt>
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      <OtherRevenueMiscGrp>
        <Desc>OTHER INCOME</Desc>
        <BusinessCd>900099</BusinessCd>
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        <ExclusionAmt>4896</ExclusionAmt>
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      <OtherRevenueTotalAmt>4896</OtherRevenueTotalAmt>
      <TotalRevenueGrp>
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        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
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      <CompCurrentOfcrDirectorsGrp>
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        <ProgramServicesAmt>14380</ProgramServicesAmt>
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      <FeesForServicesAccountingGrp>
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      <OfficeExpensesGrp>
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        <ProgramServicesAmt>7964</ProgramServicesAmt>
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        <FundraisingAmt>7830</FundraisingAmt>
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      <OtherExpensesGrp>
        <Desc>PRINTING AND PUBLICATIO</Desc>
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        <FundraisingAmt>13101</FundraisingAmt>
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      <OtherExpensesGrp>
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      <TotalFunctionalExpensesGrp>
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        <EOYAmt>10889892</EOYAmt>
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      <ReconcilationRevenueExpnssAmt>110497</ReconcilationRevenueExpnssAmt>
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      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
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      <SubstantialContributorsTotAmt>4056279</SubstantialContributorsTotAmt>
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      <Form990ScheduleAPartVIGrp>
        <FormAndLineReferenceDesc>SCHEDULE A, PART II, LINE 10, EXPLANATION OF OTHER INCOME:</FormAndLineReferenceDesc>
        <ExplanationTxt>OTHER INCOME - 2020 AMOUNT: $ 12,566. 2021 AMOUNT: $ 5,585. 2022 AMOUNT: $ 20,733. 2023 AMOUNT: $ 4,896.</ExplanationTxt>
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        <ContributorUSAddress>
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          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
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      </ContributorInformationGrp>
    </IRS990ScheduleB>
    <IRS990ScheduleD documentId="RetDoc1039900001">
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        <EndYearBalanceAmt>3424046</EndYearBalanceAmt>
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      <OtherLiabilitiesOrgGrp>
        <Desc>DONOR REFUND LIABILITY</Desc>
        <Amt>550500</Amt>
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      <FootnoteTextInd>X</FootnoteTextInd>
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      <NetUnrealizedGainsInvstAmt>1568138</NetUnrealizedGainsInvstAmt>
      <DonatedServicesAndUseFcltsAmt>697137</DonatedServicesAndUseFcltsAmt>
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      <RevenueNotReportedFinclStmtAmt>0</RevenueNotReportedFinclStmtAmt>
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      <TotExpnsEtcAuditedFinclStmtAmt>2582388</TotExpnsEtcAuditedFinclStmtAmt>
      <DonatedServicesUseFcltsAmt>697137</DonatedServicesUseFcltsAmt>
      <ExpensesNotReportedAmt>697137</ExpensesNotReportedAmt>
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      <ExpensesNotRptFinclStmtAmt>0</ExpensesNotRptFinclStmtAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART II, LINE 5:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE POLICY REGARDING CONSERVATION EASEMENTS STATES STAFF WILL CONDUCT ANNUAL MONITORING OF CONSERVATION EASEMENTS, ENCOURAGING LANDOWNERS TO BE INVOLVED WITH THE SITE VISITS AND MAINTAINING GOOD RELATIONS WITH THEM. IN CASES OF VIOLATION, SUDBURY VALLEY TRUSTEES WILL ASSESS THE PROBLEM, WORK IN A TIMELY MANNER TO PROTECT THE VALUES OF THE CONSERVATION EASEMENT AND FIND A RESOLUTION THAT FITS THE SPECIFIC SITUATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART II, LINE 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION HAS ACQUIRED AND HOLDS A NUMBER OF CONSERVATION EASEMENTS, EACH REPRESENTING A LEGAL INTEREST IN LAND OWNED BY ANOTHER PERSON OR ENTITY. CONSERVATION EASEMENTS REPRESENT RESTRICTIONS ON THE USE, SUBDIVISION AND/OR DEVELOPMENT OF CERTAIN PARCELS. THE EASEMENTS GRANT THE ORGANIZATION THE RIGHT TO USE, CONTROL, AND/OR PROTECT LAND FOR CONSERVATION PURPOSES. BECAUSE OF THE UNIQUE NATURE OF THESE ASSETS, THE IMPRACTICALITY OF OBTAINING CONSISTENT AND RELIABLE ESTIMATES OF THE VALUES ASSOCIATED WITH THESE INTERESTS, AND CONSISTENT WITH THE PRACTICES FOLLOWED BY MANY ENVIRONMENTAL LAND TRUSTS, THE ACCOMPANYING FINANCIAL STATEMENTS DO NOT INCLUDE ANY AMOUNTS FOR THESE PROPERTY INTERESTS. PURCHASED EASEMENTS ARE RECOGNIZED AS A PROGRAM EXPENSE UPON ACQUISITION BASE ON THE ACQUISITION COST OF THE EASEMENT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART V, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>INCOME FROM THE RESTRICTED ENDOWMENT IS USED PRIMARILY FOR THE STEWARDSHIP OF CONSERVATION LAND OF THE ORGANIZATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>BELOW IS AN EXCERPT FROM NOTE 2 TO THE FINANCIAL STATEMENTS: THE ORGANIZATION HAS BEEN RECOGNIZED BY THE INTERNAL REVENUE SERVICE ("IRS") AS EXEMPT FROM FEDERAL INCOME TAXES UNDER INTERNAL REVENUE CODE ("IRC") SECTION 501(A) AS AN ORGANIZATION DESCRIBED IN IRC SECTION 501(C)(3), QUALIFIES FOR CHARITABLE CONTRIBUTION DEDUCTIONS, AND HAS BEEN DETERMINED NOT TO BE A PRIVATE FOUNDATION. THE ORGANIZATION IS ANNUALLY REQUIRED TO FILE A RETURN OF ORGANIZATION EXEMPT FROM INCOME TAX (FORM 990) WITH THE IRS. IN ADDITION, THE ORGANIZATION IS SUBJECT TO INCOME TAX ON NET INCOME THAT IS DERIVED FROM BUSINESS ACTIVITIES THAT ARE UNRELATED TO ITS EXEMPT PURPOSE. THE ORGANIZATION ACCOUNTS FOR UNCERTAIN TAX PROVISIONS UNDER FINANCIAL ACCOUNTING STANDARDS BOARD ("FASB") ACCOUNTING STANDARDS CODIFICATION ("ASC") 740, INCOME TAXES, WHICH PROVIDES A FRAMEWORK FOR HOW ENTITIES SHOULD RECOGNIZE, MEASURE, PRESENT, AND DISCLOSE UNCERTAIN TAX POSITIONS IN THEIR FINANCIAL STATEMENTS. THE ORGANIZATION MAY RECOGNIZE THE TAX BENEFIT FROM AN UNCERTAIN TAX POSITION ONLY IF IT IS MORE LIKELY THAN NOT THAT THE TAX POSITION WILL BE SUSTAINED ON EXAMINATION BY THE TAXING AUTHORITIES, BASED ON THE TECHNICAL MERITS OF THE POSITION. MANAGEMENT HAS REVIEWED THE ORGANIZATION'S REPORTING AND BELIEVES THEY HAVE NOT TAKEN TAX POSITIONS THAT ARE MORE LIKELY THAN NOT TO BE DETERMINED TO BE INCORRECT BY THE IRS AND, THEREFORE, NO ADJUSTMENTS OR DISCLOSURES ARE REQUIRED. THE ORGANIZATION IS SUBJECT TO ROUTINE AUDITS BY TAXING JURISDICTIONS; HOWEVER, THERE ARE CURRENTLY NO AUDITS FOR ANY TAX PERIODS PENDING OR IN PROGRESS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleG documentId="RetDoc1041300001">
      <FundraisingEventInformationGrp>
        <Event1Nm>ANNUAL BENEFIT</Event1Nm>
        <GrossReceiptsEvent1Amt>157402</GrossReceiptsEvent1Amt>
        <CharitableContriEvent1Amt>128312</CharitableContriEvent1Amt>
        <GrossRevenueEvent1Amt>29090</GrossRevenueEvent1Amt>
        <NonCashPrizesEvent1Amt>6750</NonCashPrizesEvent1Amt>
        <RentFacilityCostsEvent1Amt>2500</RentFacilityCostsEvent1Amt>
        <FoodAndBeverageEvent1Amt>27166</FoodAndBeverageEvent1Amt>
        <EntertainmentEvent1Amt>3400</EntertainmentEvent1Amt>
        <OtherDirectExpensesEvent1Amt>3924</OtherDirectExpensesEvent1Amt>
        <GrossReceiptsTotalAmt>157402</GrossReceiptsTotalAmt>
        <CharitableContributionsTotAmt>128312</CharitableContributionsTotAmt>
        <GrossRevenueTotalEventsAmt>29090</GrossRevenueTotalEventsAmt>
        <NonCashPrizesTotalEventsAmt>6750</NonCashPrizesTotalEventsAmt>
        <RentFcltyCostsTotalEventsAmt>2500</RentFcltyCostsTotalEventsAmt>
        <FoodAndBeverageTotalEventsAmt>27166</FoodAndBeverageTotalEventsAmt>
        <EntertainmentTotalEventsAmt>3400</EntertainmentTotalEventsAmt>
        <OthDirectExpnssTotalEventsAmt>3924</OthDirectExpnssTotalEventsAmt>
        <DirectExpenseSummaryEventsAmt>43740</DirectExpenseSummaryEventsAmt>
        <NetIncomeSummaryAmt>-14650</NetIncomeSummaryAmt>
      </FundraisingEventInformationGrp>
    </IRS990ScheduleG>
    <IRS990ScheduleM documentId="RetDoc1042900001">
      <SecuritiesPubliclyTradedGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>5</ContributionCnt>
        <NoncashContributionsRptF990Amt>60317</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FMV</MethodOfDeterminingRevenuesTxt>
      </SecuritiesPubliclyTradedGrp>
      <Form8283ReceivedCnt>0</Form8283ReceivedCnt>
      <AnyPropertyThatMustBeHeldInd>0</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>1</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>0</ThirdPartiesUsedInd>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION HAS MEMBERS WHO VOTE TO ELECT OFFICERS AND DIRECTORS AT THE ANNUAL MEETING AND THEY VOTE ON ANY BY-LAW CHANGES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>MEMBERS VOTE TO ELECT OFFICERS AND DIRECTORS AT THE ANNUAL MEETING AND THEY VOTE ON ANY BY-LAW CHANGES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>GOVERNANCE DECISIONS OF THE ORGANIZATION ARE SUBJECT TO A VOTE FOR APPROVAL BY MEMBERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE 990 IS REVIEWED BY THE TREASURER AND EXECUTIVE DIRECTOR WHO REVIEW IT WITH THE BOARD OF DIRECTORS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>ANNUALLY EACH MEMBER OF THE BOARD OF DIRECTORS REVIEWS THE CONFLICT OF INTEREST POLICY AND DISCLOSES ANY POSSIBLE CONFLICTS OF INTEREST BY SIGNING A FORM TO THAT EFFECT. BOARD MEMBERS MUST RECUSE IF A VOTE IS TO BE TAKEN ON AN ISSUE IN WHICH THE MEMBER HAS A CONFLICT OF INTEREST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>COMPENSATION FOR THE EXECUTIVE DIRECTOR IS EVALUATED ANNUALLY BASED ON ACHIEVEMENT OF GOALS AGREED UPON BY THE EXECUTIVE COMMITTEE OF THE BOARD OF DIRECTORS. THE EXECUTIVE COMMITTEE TAKES INTO CONSIDERATION COMPENSATION PACKAGES OF EXECUTIVE DIRECTORS FOR COMPARABLE ORGANIZATIONS. THE EXECUTIVE COMMITTEE MAKES RECOMMENDATIONS TO THE BOARD OF DIRECTORS WHICH VOTES ON THE EXECUTIVE DIRECTOR'S COMPENSATION PACKAGE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>AVAILABLE UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>