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      <ReconcilationRevenueExpnssAmt>220673</ReconcilationRevenueExpnssAmt>
      <NetUnrlzdGainsLossesInvstAmt>-16209</NetUnrlzdGainsLossesInvstAmt>
      <InfoInScheduleOPartXIIInd>X</InfoInScheduleOPartXIIInd>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>false</AccountantCompileOrReviewInd>
      <FSAuditedInd>true</FSAuditedInd>
      <FSAuditedBasisGrp>
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      <AuditCommitteeInd>true</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>false</FederalGrantAuditRequiredInd>
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        <CurrentTaxYearMinus3YearsAmt>69617</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>129640</CurrentTaxYearMinus2YearsAmt>
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        <CurrentTaxYearAmt>183585</CurrentTaxYearAmt>
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        <CurrentTaxYearAmt>1139351</CurrentTaxYearAmt>
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        <CurrentTaxYearAmt>8072</CurrentTaxYearAmt>
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      <InvestmentIncomeAndUBTIGrp>
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      <InvestmentIncomePYPct>0.00320</InvestmentIncomePYPct>
      <ThirtyThrPctSuprtTestsCY509Ind>X</ThirtyThrPctSuprtTestsCY509Ind>
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    <IRS990ScheduleB documentId="00000003">
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        <ContributorBusinessName>
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        <ContributorUSAddress>
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          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
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        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
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    <IRS990ScheduleD documentId="00000004" softwareId="14000261">
      <CollectionUsedPubExhibitionInd>X</CollectionUsedPubExhibitionInd>
      <CollUsedScholarlyRsrchInd>X</CollUsedScholarlyRsrchInd>
      <CollectionUsedPreservationInd>X</CollectionUsedPreservationInd>
      <SolicitedAssetsSaleInd>false</SolicitedAssetsSaleInd>
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        <BookValueAmt>905721</BookValueAmt>
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      <EquipmentGrp>
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        <BookValueAmt>15526</BookValueAmt>
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        <BookValueAmt>220693</BookValueAmt>
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      <TotalBookValueLandBuildingsAmt>1688320</TotalBookValueLandBuildingsAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
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      <NetUnrealizedGainsInvstAmt>-16209</NetUnrealizedGainsInvstAmt>
      <RevenueNotReportedAmt>-16209</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>1224376</RevenueSubtotalAmt>
      <TotalRevenuePerForm990Amt>1224376</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>1003703</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesSubtotalAmt>1003703</ExpensesSubtotalAmt>
      <TotalExpensesPerForm990Amt>1003703</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt X, Line 2</FormAndLineReferenceDesc>
        <ExplanationTxt>The organization recognizes the tax effects from an uncertain tax position in the financial statements only if the position is more-likely-than-not to be sustained if the position were to be challenged by a taxing authority. Management has determined that the organization has no uncertain tax positions that would require financial statement recognition or disclosure.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt III, Line 4</FormAndLineReferenceDesc>
        <ExplanationTxt>The organization's collections trace the history of the Montauk Lighthouse as well as the surrounding areas of Montauk, NY. The Montauk Historical Society maintains and holds open to the public, these important historical structures: The lighthouse tower (circa 1796 and renovated 1860), keeper's dwelling (1860), and oil house (1860). Additionally, Second House, built 1797, is the oldest and most historic building still standing on Montauk. The Organization's collections also include artifacts, manuscripts, works of art and other historical records.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt III, Line 1a</FormAndLineReferenceDesc>
        <ExplanationTxt>Consistent with the policies of many other museums, the value of the museum's collections is not reflected in the statement of financial position. Purchases of items are expensed in the year that the items are acquired. Contributed collection items are not reflected in the financial statements. Proceeds from deaccessions or insurance recoveries are used to acquire other items for collection. Contributions for the purchase of items for the collection are classified as temporarily restricted net assets until acquisitions are made. The cost of these items is reported as a separate program expense.</ExplanationTxt>
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        <GrossRevenueEvent1Amt>85219</GrossRevenueEvent1Amt>
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        <GrossReceiptsTotalAmt>97219</GrossReceiptsTotalAmt>
        <CharitableContributionsTotAmt>12000</CharitableContributionsTotAmt>
        <GrossRevenueTotalEventsAmt>85219</GrossRevenueTotalEventsAmt>
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        <DirectExpenseSummaryEventsAmt>44603</DirectExpenseSummaryEventsAmt>
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      <BusTrInvolveInterestedPrsnGrp>
        <NameOfInterested>
          <PersonNm>GREG DONOHUE</PersonNm>
        </NameOfInterested>
        <RelationshipDescriptionTxt>Board Member</RelationshipDescriptionTxt>
        <TransactionAmt>30531</TransactionAmt>
        <TransactionDesc>Landscaping</TransactionDesc>
        <SharingOfRevenuesInd>false</SharingOfRevenuesInd>
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    <IRS990ScheduleO documentId="00000007" softwareId="14000261">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>A qualified and authorized person shall complete the annual Form 990 informational return. The return shall be reviewed by the Executive Director and then presented to all board members either via e-mail or by paper copy prior to its filing with the IRS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>Each director, principal and officer, shall disclose any known conflicts in accordance to the organization's conflicts of interest policy.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 15a</FormAndLineReferenceDesc>
        <ExplanationTxt>The salaries of the officers, if any, shall be fixed by resolution of the board of directors. In all cases, any salaries received by officers of this organization shall be reasonable. All officer salaries shall be approved in advance in accordance with the organization's conflict of interest policy.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 15b</FormAndLineReferenceDesc>
        <ExplanationTxt>See Part VI, Line 15a</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>The organization makes its Governing Documents, Conflicts of Interest Policy and Financial Statements available to the public upon written request.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt XII, Line 2c</FormAndLineReferenceDesc>
        <ExplanationTxt>The independent members of the governance board act as the audit committee and assume responsibility for the oversight of the audit of the financial statements and the selection of the independent accountant.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24f</FormAndLineReferenceDesc>
        <ExplanationTxt>POSTAGE AND DELIVERY 2797. 0. 2797. 0. DUES AND FEES 826. 0. 826. 0. PRINTING AND SIGNAGE 15285. 15285. 0. 0. SMALL EQUIPMENT 1962. 1962. 0. 0. UNIFORMS 1304. 1304. 0. 0. PAYROLL PROCESSING 4521. 4521. 0. 0. RETIREMENT ADMIN FEES 2131. 0. 2131. 0. BANK FEES 53. 0. 53. 0. EXHIBIT SUPPLIES 530. 530. 0. 0.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>