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      </ProgramServiceRevenueGrp>
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      <NetGainOrLossInvestmentsGrp>
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        <ExclusionAmt>4800</ExclusionAmt>
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        <ProgramServicesAmt>18460</ProgramServicesAmt>
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      <OtherExpensesGrp>
        <Desc>Special Projects</Desc>
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        <ProgramServicesAmt>18033</ProgramServicesAmt>
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        <ProgramServicesAmt>11639</ProgramServicesAmt>
        <ManagementAndGeneralAmt>4988</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
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        <ProgramServicesAmt>13558</ProgramServicesAmt>
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      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>true</AccountantCompileOrReviewInd>
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        <CurrentTaxYearMinus2YearsAmt>301993</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>281342</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>311210</CurrentTaxYearAmt>
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      <ProtectionNaturalHabitatInd>X</ProtectionNaturalHabitatInd>
      <PreservationOpenSpaceInd>X</PreservationOpenSpaceInd>
      <TotalEasementsCnt>14</TotalEasementsCnt>
      <TotalAcreageCnt>50</TotalAcreageCnt>
      <StatesEasementsHeldCnt>1</StatesEasementsHeldCnt>
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        <DepreciationAmt>194987</DepreciationAmt>
        <BookValueAmt>1081013</BookValueAmt>
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        <DepreciationAmt>14892</DepreciationAmt>
        <BookValueAmt>3261</BookValueAmt>
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      <OtherLandBuildingsGrp>
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        <DepreciationAmt>1378</DepreciationAmt>
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      <TotalBookValueLandBuildingsAmt>1084274</TotalBookValueLandBuildingsAmt>
      <OtherAssetsOrgGrp>
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        <BookValueAmt>11383207</BookValueAmt>
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      <TotalBookValueOtherAssetsAmt>11383207</TotalBookValueOtherAssetsAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
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      <RevenueSubtotalAmt>421614</RevenueSubtotalAmt>
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      <ExpensesSubtotalAmt>463197</ExpensesSubtotalAmt>
      <TotalExpensesPerForm990Amt>463197</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part II, Line 5: Summarized Policy</FormAndLineReferenceDesc>
        <ExplanationTxt>Monitoring, inspecting and enforcing easements includes: maintaining good landowner relations; conducting annual monitoring and providing a written summary to the landowners following the monitoring visit; and reminding landowners to check their easement agreement before altering the property in any way. For suspected violations: review the easement and related documentation; document any violation; and contact the landowner. Enforcement strategies may include: education, mediation, remediation, mitigation payments, amendment, injunctions, No Trespass Service, litigation and criminal charges.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part II, Line 9: Organization Reporting of conservation easements.</FormAndLineReferenceDesc>
        <ExplanationTxt>The costs of conservation easements and the expenses associated with their acquisitions are expensed in the Statement of Revenue and Expenses in the year incurred. Land purchased or received through donations is reported as an asset on the organization's Balance Sheet.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part X : FIN48 Footnote</FormAndLineReferenceDesc>
        <ExplanationTxt>NSOLF recognizes the effect of tax positions only when they are more likely than not to be sustained. Management has determined that NSOLF had no uncertain tax positions that would require financial statement recognition or disclosure. NSOLF is no longer subject to examinations by the applicable taxing jurisdictions for periods prior to December 31, 2020.</ExplanationTxt>
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        <ContributionCnt>3</ContributionCnt>
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      <ReviewProcessUnusualNCGiftsInd>false</ReviewProcessUnusualNCGiftsInd>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 6</FormAndLineReferenceDesc>
        <ExplanationTxt>The public is invited to become a member of the North Salem Open Land Foundation in exchange for a contribution of annual dues. Members are not afforded any special benefits.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>All trustees are emailed or mailed a copy of Form 990 for review. Any questions that may arise will be handled by the Executive Director or the organization's accountants prior to filing the Form 990.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>Each Trustee and staff member shall sign a statement on an annual basis which affirms that such person: 1. Has received a copy of the Conflict of Interest Policy; 2. Has read and understands this Policy; and 3. Has agreed to comply with this Policy. All signed statements will be filed with NSOLFs other important documents and maintained according to its Record Keeping Policy.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>A Financial Report of Revenue &amp; Expenses is published in the Annual Report. All other documents are available upon request.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
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</Return>