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        <PersonNm>David Katona</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Jack Kelley</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Cora Olgyay</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Laura Pierce</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Edward L Samek</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Curtis Simard</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Hannah Sistare Clark</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Christiaan van Heerden</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Liz Williams</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>John Fassak</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Joan Pew</PersonNm>
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        <PersonNm>Eric Stiles</PersonNm>
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        <PersonNm>Jason Irwin</PersonNm>
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        <PersonNm>Lisa Horsch Clark</PersonNm>
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        <PersonNm>Stephanie Clement</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Sarah Curts</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Devin Lueddeke</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Lori Schaefer</PersonNm>
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        <ContractorName>
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            <BusinessNameLine1Txt>Your Part Time Controller</BusinessNameLine1Txt>
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          <USAddress>
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        <ProgramServicesAmt>1368</ProgramServicesAmt>
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        <ProgramServicesAmt>21044</ProgramServicesAmt>
        <FundraisingAmt>1686</FundraisingAmt>
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        <ManagementAndGeneralAmt>19513</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
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        <ManagementAndGeneralAmt>759662</ManagementAndGeneralAmt>
        <FundraisingAmt>1021311</FundraisingAmt>
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        <EOYAmt>39960</EOYAmt>
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        <EOYAmt>2916765</EOYAmt>
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        <EOYAmt>126203</EOYAmt>
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        <EOYAmt>6984188</EOYAmt>
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        <EOYAmt>83771161</EOYAmt>
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        <EOYAmt>282612</EOYAmt>
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      <TotalAssetsGrp>
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        <EOYAmt>97289675</EOYAmt>
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        <EOYAmt>949432</EOYAmt>
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        <EOYAmt>0</EOYAmt>
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        <EOYAmt>2550</EOYAmt>
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      <TotalLiabilitiesGrp>
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        <EOYAmt>951982</EOYAmt>
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      <OrganizationFollowsFASB117Ind>X</OrganizationFollowsFASB117Ind>
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        <EOYAmt>18524701</EOYAmt>
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      <DonorRestrictionNetAssetsGrp>
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        <EOYAmt>77812992</EOYAmt>
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        <EOYAmt>96337693</EOYAmt>
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          <ZIPCd>04607</ZIPCd>
        </USAddress>
        <RecipientEIN>200718450</RecipientEIN>
        <IRCSectionDesc>501(c)(3)</IRCSectionDesc>
        <CashGrantAmt>7180</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>Conservation</PurposeOfGrantTxt>
      </RecipientTable>
      <Total501c3OrgCnt>16</Total501c3OrgCnt>
      <TotalOtherOrgCnt>0</TotalOtherOrgCnt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>The Organization maintains a policy designed to monitor the grant arrangements the Organization enters into. The Organization sends letters specifying what the grant is for and requesting a return letter that the grant will be used for the intended purpose. The Organization meets with Acadia National Park staff at least once per year. Park staff provide documentation of where and how grants were used.</ExplanationTxt>
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    </IRS990ScheduleI>
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      <CompensationSurveyInd>X</CompensationSurveyInd>
      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
      <SeverancePaymentInd>1</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>0</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>0</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>0</CompBasedOnRevenueOfFlngOrgInd>
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      <InitialContractExceptionInd>0</InitialContractExceptionInd>
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        <PersonNm>Eric Stiles</PersonNm>
        <TitleTxt>President &amp; CEO</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>30000</OtherCompensationFilingOrgAmt>
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        <DeferredCompensationFlngOrgAmt>13182</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>38956</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>302587</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Lisa Horsch Clark</PersonNm>
        <TitleTxt>VP of Development</TitleTxt>
        <BaseCompensationFilingOrgAmt>153307</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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        <DeferredCompensationFlngOrgAmt>8005</DeferredCompensationFlngOrgAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 4a</FormAndLineReferenceDesc>
        <ExplanationTxt>Jason Irwin, Past Vice President &amp; CFO, received severance payment of $24,374 during 2024. Lori Schaefer, Past Vice President of Communications &amp; Marketing, received severance payment of $25,000 during 2024.</ExplanationTxt>
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    </IRS990ScheduleJ>
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        <ContributionCnt>23</ContributionCnt>
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        <MethodOfDeterminingRevenuesTxt>Donor Estimated Value</MethodOfDeterminingRevenuesTxt>
      </WorksOfArtGrp>
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        <ContributionCnt>1</ContributionCnt>
        <NoncashContributionsRptF990Amt>0</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>Appraisal</MethodOfDeterminingRevenuesTxt>
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        <ContributionCnt>23</ContributionCnt>
        <NoncashContributionsRptF990Amt>1066581</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>Market Price</MethodOfDeterminingRevenuesTxt>
      </SecuritiesPubliclyTradedGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>Trips/Travel</Desc>
        <ContributionCnt>25</ContributionCnt>
        <NoncashContributionsRptF990Amt>0</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>Donor Estimated Valu</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>Auction Items</Desc>
        <ContributionCnt>58</ContributionCnt>
        <NoncashContributionsRptF990Amt>0</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>Donor Estimated Valu</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <Form8283ReceivedCnt>0</Form8283ReceivedCnt>
      <AnyPropertyThatMustBeHeldInd>0</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>1</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>1</ThirdPartiesUsedInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 32b:</FormAndLineReferenceDesc>
        <ExplanationTxt>The Organization uses an auctioneer to run the annual auction. In addition, the Organization sells contributions of securities through its investment broker. All gifts of securities are sold as soon as administratively possible.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 33:</FormAndLineReferenceDesc>
        <ExplanationTxt>For various auctioned items, the Organization does not record revenue when items are donated, rather when the items are sold at the auction event. The donor estimated value of auctioned items was $326,940.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part III, line 2</FormAndLineReferenceDesc>
        <ExplanationTxt>Friends of Acadia finalized construction of two dormitory style buildings for ANP, consisting of eight new bedrooms, offering seasonal residence for up to 16 park employees. The buildings were constructed to a 100 year service life standard and include a solar array to provide year-round energy to the entire complex.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 4</FormAndLineReferenceDesc>
        <ExplanationTxt>During 2024, Friends of Acadia amended its bylaws to: (i) implement director and officer term limits; (ii) revise the President's role to non-voting ex officio Board member; (iii) adjust the composition of the Executive Committee; (iv) create a new Development Committee; and (v) clarify terms and eligibility for committee chairs and members.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 6</FormAndLineReferenceDesc>
        <ExplanationTxt>Those individuals who pay annual dues or make contributions in an amount set from time to time by the Board shall be known as Members of the Organization. Members do not have voting rights or any other power or authority to govern the Organization in any capacity.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>To maintain donor requests for anonymity, the complete 990 is reviewed by the Audit Committee that consists of six board members, including the Chair and Treasurer, neither of whom are Chair of the Committee. The President &amp; CEO, Vice President of Finance and Administration also attend the meeting, and after discussion with the lead and managing auditors, the 990 is filed. Additionally, the Board of Directors is provided with a copy of the Public Disclosure copy prior to filing.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>Once a year, a disclosure form is given to each board member as well as the members of the development, investment, finance committees, and staff. Completion of the forms is required. Those who do not return the form are mailed another form and emailed a reminder. The answers are reviewed by the governance/nominating committee who report to the Board. If vote is called on a motion for which a board member has a conflict of interest, they will recuse themselves from voting, or be asked to do so by the Chair.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>The policy of the Organization is to periodically commission a salary and benefits survey to review current positions and related salaries. The most recent survey was commissioned during 2022. Also taken into consideration is cost of living and rate of inflation statistics. The Chair of the Friends of Acadia Board of Directors sets the President's salary.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>The Organization makes its governing documents, conflict of interest policy, and financial statements available to the public upon request.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part X, Line 10: Land, Buildings, and Equipment</FormAndLineReferenceDesc>
        <ExplanationTxt>Section 1.263(a)-3(n) Election: Friends of Acadia P.O. Box 45 Bar Harbor, ME 04609 EIN 01-0425071 Friends of Acadia is electing to capitalize repair and maintenance costs under Regulation Section 1.263(a)-3(n).</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>