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      <MembershipDuesAmt>344031</MembershipDuesAmt>
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      <TotalContributionsAmt>994261</TotalContributionsAmt>
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      <ReconcilationRevenueExpnssAmt>-120929</ReconcilationRevenueExpnssAmt>
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      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>false</AccountantCompileOrReviewInd>
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      <PublicOrganization170Ind>X</PublicOrganization170Ind>
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      <SubstantialContributorsTotAmt>0</SubstantialContributorsTotAmt>
      <PublicSupportTotal170Amt>5826646</PublicSupportTotal170Amt>
      <GrossInvestmentIncome170Grp>
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        <CurrentTaxYearAmt>-370259</CurrentTaxYearAmt>
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      <FootnoteTextInd>X</FootnoteTextInd>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part X : FIN48 Footnote</FormAndLineReferenceDesc>
        <ExplanationTxt>The Foundation implemented ASC 740-10, the generally accepted accounting guidance for uncertainty in income taxes. As of December 31, 2015, the Foundation had made no changes in the purpose, character or method of operations, and therefore there were no uncertain tax positions that qualify for either recognition or disclosure in the financial statements. The Foundations Forms 990, Return of Organization Exempt from Income Tax, for the years ended 2014, 2013 and 2012 are subject to examination by the Internal Revenue Service, generally for three years after they were filed.</ExplanationTxt>
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        <TitleTxt>Executive Dir.</TitleTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part III, Line 4d: Other Program Services Description</FormAndLineReferenceDesc>
        <ExplanationTxt>OTHER PROGRAM SERVICES 4: The Long Now Foundation engages in various projects and programs whose aim is to creatively foster responsibility in the framework of the next 10,000 years. Besides the 10,000 Year Clock and Seminars about Long-term Thinking, these projects include Long Bets, The Rosetta Project, Panlex, and Revive and Restore. OTHER PROGRAM SERVICES 5: Revive and Restore - Revive &amp; Restores mission is to enhance biodiversity through genetic rescue of endangered and extinct species. Beside its focus on bringing back the passenger pigeon, Revive &amp; Restore is exploring projects to support genomic work in allele replacement for species experiencing a loss of diversity. Revive &amp; Restore also serves as a clearinghouse for de-extinction and rewilding projects worldwide. OTHER PROGRAM SERVICES 6: The Interval Salon - a space in Fort Mason Center open to the public seven days a week that includes project installations and exhibits, a library, beverages, and an educational events program. It is a compelling venue for conversation that invites visitors to spend time in a place that itself encourages long-term thinking.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 11b: Form 990 Review Process</FormAndLineReferenceDesc>
        <ExplanationTxt>The Executive Director and Board review the 990 before filing.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 12c: Explanation of Monitoring and Enforcement of Conflicts</FormAndLineReferenceDesc>
        <ExplanationTxt>All Trustees, Directors, Officers, and Key Employees are required to sign a Conflict of Interest policy. It is the policy of the Board that the existence of any interests that give rise to conflict be disclosed on a timely basis and always before any transaction is consummated. It shall be the continuing responsibility of the Board, officers, and management employees to scrutinize their transactions and outside business interests and relationships for potential conflicts and to immediately make such disclosures. Board member disclosures should be made to a Board officer and staff disclosures should be made to the chief executive. The Board shall determine whether a conflict exists and is material, and in the presence of an existing material conflict, whether the contemplated transaction may be authorized as just, fair, and reasonable to Long Now. The decision of the BOard on these matters will rest in their sole discretion, and their concern must be the welfare of Long Now and the advancement of its purpose.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 15a: Compensation Review &amp; Approval Process - CEO, Top Management</FormAndLineReferenceDesc>
        <ExplanationTxt>The Executive Director compensation is based on Board review and comparison data with other Northern California nonprofit organizations.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 15b: Compensation Review and Approval Process for Officers and Key Employees</FormAndLineReferenceDesc>
        <ExplanationTxt>Board members do not receive financial compensation. Compensation for key employees is recommended by the Executive Director and reviewed by the Board of Directors.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 19: Other Organization Documents Publicly Available</FormAndLineReferenceDesc>
        <ExplanationTxt>The Long Now Foundation's 990s are available through Guidestar (www.guidestar.org). All other governing documents are available by request as per applicable laws.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>