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        <EndYearBalanceAmt>16953238</EndYearBalanceAmt>
      </CYMinus2YrEndwmtFundGrp>
      <CYMinus3YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>13456777</BeginningYearBalanceAmt>
        <ContributionsAmt>216021</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>574477</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>528857</OtherExpendituresAmt>
        <EndYearBalanceAmt>13718418</EndYearBalanceAmt>
      </CYMinus3YrEndwmtFundGrp>
      <CYMinus4YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>11525327</BeginningYearBalanceAmt>
        <ContributionsAmt>1303160</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>1142220</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>513930</OtherExpendituresAmt>
        <EndYearBalanceAmt>13456777</EndYearBalanceAmt>
      </CYMinus4YrEndwmtFundGrp>
      <BoardDesignatedBalanceEOYPct>0.25120</BoardDesignatedBalanceEOYPct>
      <PrmnntEndowmentBalanceEOYPct>0.33400</PrmnntEndowmentBalanceEOYPct>
      <TermEndowmentBalanceEOYPct>0.41480</TermEndowmentBalanceEOYPct>
      <EndowmentsHeldUnrelatedOrgInd>1</EndowmentsHeldUnrelatedOrgInd>
      <EndowmentsHeldRelatedOrgInd>0</EndowmentsHeldRelatedOrgInd>
      <BuildingsGrp>
        <OtherCostOrOtherBasisAmt>6463079</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>2889673</DepreciationAmt>
        <BookValueAmt>3573406</BookValueAmt>
      </BuildingsGrp>
      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>775132</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>541693</DepreciationAmt>
        <BookValueAmt>233439</BookValueAmt>
      </EquipmentGrp>
      <TotalBookValueLandBuildingsAmt>3806845</TotalBookValueLandBuildingsAmt>
      <OtherAssetsOrgGrp>
        <Desc>PERPETUAL INSURANCE DEPOSITS</Desc>
        <BookValueAmt>4730</BookValueAmt>
      </OtherAssetsOrgGrp>
      <OtherAssetsOrgGrp>
        <Desc>BENEFICIAL INTEREST IN PERPETUAL TRUST</Desc>
        <BookValueAmt>6978934</BookValueAmt>
      </OtherAssetsOrgGrp>
      <TotalBookValueOtherAssetsAmt>6983664</TotalBookValueOtherAssetsAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>2824909</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>-293184</NetUnrealizedGainsInvstAmt>
      <OtherRevenueAmt>305508</OtherRevenueAmt>
      <RevenueNotReportedAmt>12324</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>2812585</RevenueSubtotalAmt>
      <InvestmentExpensesNotIncldAmt>26664</InvestmentExpensesNotIncldAmt>
      <RevenueNotReportedFinclStmtAmt>26664</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>2839249</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>1604353</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>1604353</ExpensesSubtotalAmt>
      <InvestmentExpensesNotIncld2Amt>26664</InvestmentExpensesNotIncld2Amt>
      <ExpensesNotRptFinclStmtAmt>26664</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>1631017</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART III, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>WORKS OF ART AND HISTORICAL TREASURES, CONSISTING PRIMARILY OF BOOKS, MANUSCRIPTS, AND ARCHITECTURAL DRAWINGS THAT ARE CONSIDERED TO HAVE CULTURAL, AESTHETIC, HISTORICAL, OR RESEARCH VALUE THAT ARE WORTH PRESERVING AND WHICH ARE BEING SO PRESERVED, AND BOOKS, EBOOKS, AUDIOBOOKS, AND PERIODICALS THAT ARE PART OF THE CIRCULATING LIBRARY, ARE NOT CAPITALIZED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART V, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ATHENAEUM MAY USE UP TO 5% OF THE AVERAGE MARKET VALUE OF THE PREVIOUS THREE YEARS' PERMANENTLY RESTRICTED NET ASSETS UNDER THE TOTAL RETURN CONCEPT AS ESTABLISHED BY BOARD RESOLUTION IN ORDER TO ACCOMPLISH ITS EDUCATIONAL AND CHARITABLE MISSION DESCRIBED IN PART III</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>MANAGEMENT HAS REVIEWED THE TAX POSITIONS FOR EACH OF THE OPEN TAX YEARS (2020-2022) OR EXPECTED TO BE TAKEN IN THE ATHENAEUM'S 2023 TAX RETURN AND HAS CONCLUDED THAT THERE ARE NO SIGNIFICANT UNCERTAIN TAX POSITIONS THAT WOULD REQUIRE RECOGNITION IN THE FINANCIAL STATEMENTS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XI, LINE 2D - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>UNREALIZED GAIN ON BENEFICIAL INTEREST IN PERPETUAL TRUST 305,508.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART III, LINE 4</FormAndLineReferenceDesc>
        <ExplanationTxt>CHARLES E. PETERSON FELLOWSHIP OF THE BUILDINGS OF THE UNITED STATES - IN A JOINT PROGRAM WITH THE SOCIETY OF ARCHITECTURAL HISTORIANS AN ANNUAL FELLOWSHIP THAT SUPPORTS THE PARTICIPATION OF A GRADUATE STUDENT IN THE RESEARCH AND WRITING FOR A VOLUME IN THE BUILDINGS OF THE UNITED STATES SERIES. THE SOCIETY OF ARCHITECTURAL HISTORIANS WAS FOUNDED TO ADVANCE KNOWLEDGE AND UNDERSTANDING OF THE HISTORY OF ARCHITECTURE, DESIGN, LANDSCAPE, AND URBANISM WORLDWIDE. AMERICAN INSTITUTE OF ARCHITECTS FELLOWSHIP FOR TRAVEL - THIS AWARD ENABLES STUDENTS WHO HAVE WON THE CHARLES E. PETERSON PRIZE TO TRAVEL TO THE AWARDS CEREMONY. CHARLES E. PETERSON FELLOWSHIP - THE FELLOWSHIP IS AWARDED TO A SENIOR SCHOLAR WHOSE PROJECT IS FOCUSED ON AMERICAN ARCHITECTURE, DESIGN, LANDSCAPE, OR ENGINEERING PRIOR TO 1860. CHARLES E. PETERSON PRIZES - PRIZES ARE AWARDED TO TEAMS OF COLLEGE STUDENTS FOR THE BEST ARCHITECTURAL DRAWINGS OF HISTORIC STRUCTURES IN CONJUNCTION WITH THE NATIONAL PARK SERVICE'S HISTORIC AMERICAN BUILDINGS SURVEY PROGRAM.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleI documentId="RetDoc1041900001">
      <GrantRecordsMaintainedInd>1</GrantRecordsMaintainedInd>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>CHARLES E PETERSON PRIZES</GrantTypeTxt>
        <RecipientCnt>1</RecipientCnt>
        <CashGrantAmt>29500</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>CHARLES E. PETERSON FELLOWSHIP OF THE BUILDINGS OF THE UNITED STATES - IN A JOINT PROGRAM WITH THE SOCIETY OF ARCHITECTURAL HISTORIANS AN ANNUAL FELLOWSHIP THAT SUPPORTS THE PARTICIPATION OF A GRADUATE STUDENT IN THE RESEARCH AND WRITING FOR A VOLUME IN THE BUILDINGS OF THE UNITED STATES SERIES. THE SOCIETY OF ARCHITECTURAL HISTORIANS WAS FOUNDED TO ADVANCE KNOWLEDGE AND UNDERSTANDING OF THE HISTORY OF ARCHITECTURE, DESIGN, LANDSCAPE, AND URBANISM WORLDWIDE. CHARLES E. PETERSON INTERNSHIPS - COLLEGE STUDENTS AND STUDENTS PURSUING ADVANCED DEGREES ARE CHOSEN TO WORK WITH COLLECTIONS AT THE ATHENAEUM OF PHILADELPHIA RELEVANT TO AMERICAN ARCHITECTURE AND ENGINEERING PRIOR TO 1860. CHARLES E. PETERSON FELLOWSHIP - THE FELLOWSHIP IS AWARDED TO A SENIOR SCHOLAR WHOSE PROJECT IS FOCUSED ON AMERICAN ARCHITECTURE, DESIGN, LANDSCAPE, OR ENGINEERING PRIOR TO 1860. CHARLES E. PETERSON PRIZES - PRIZES ARE AWARDED TO TEAMS OF COLLEGE STUDENTS FOR THE BEST ARCHITECTURAL DRAWINGS OF HISTORIC STRUCTURES IN CONJUNCTION WITH THE NATIONAL PARK SERVICE'S HISTORIC AMERICAN BUILDINGS SURVEY PROGRAM.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleI>
    <IRS990ScheduleJ documentId="RetDoc1042400001">
      <SeverancePaymentInd>0</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>0</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>0</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>0</CompBasedOnRevenueOfFlngOrgInd>
      <CompBsdOnRevRelatedOrgsInd>0</CompBsdOnRevRelatedOrgsInd>
      <CompBsdNetEarnsFlngOrgInd>0</CompBsdNetEarnsFlngOrgInd>
      <CompBsdNetEarnsRltdOrgsInd>0</CompBsdNetEarnsRltdOrgsInd>
      <AnyNonFixedPaymentsInd>0</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>0</InitialContractExceptionInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>BETH HESSEL</PersonNm>
        <TitleTxt>EXECUTIVE DIRECTOR</TitleTxt>
        <BaseCompensationFilingOrgAmt>161019</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>22181</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>183200</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ATHENAEUM IS SUPPORTED IN PART BY PAID MEMBERSHIPS. THE MEMBERS, SOMETIMES REFERRED TO AS STOCKHOLDERS OR SHAREHOLDERS, PURCHASE A "SHARE OR MEMBERSHIP THAT REMAINS IN THEIR NAME AS LONG AS THE MEMBER PAYS ANNUAL "DUES". IN ADDITION, THERE ARE SUBSCRIBERS AND YOUNG FRIENDS WHO PAY DUES AND RECEIVE MEMBERSHIP PRIVILEGES. IN ADDITION, THERE ARE SUBSCRIBERS AND YOUNG FRIENDS WHO PAY ANNUAL DUES AND RECEIVE MEMBERSHIP PRIVILEGES, AND LIFETIME SHAREHOLDERS, WHO HAVE MADE A ONE-TIME GIFT THAT FREES THEM FROM THE ANNUAL DUES PAYMENT RESPONSIBILITY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BOARD OFFICERS ARE NOMINATED BY THE BOARD AND ELECTED BY SHAREHOLDERS AT THE ANNUAL SHAREHOLDERS MEETING. ALL BOARD MEMBERS ARE SHAREHOLDER MEMBERS OF THE ATHENAEUM.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>SHAREHOLDERS CONVENE AT THE "ANNUAL MEETING" TO ELECT OFFICERS AND BOARD MEMBERS, TO RATIFY DECISIONS OF THE BOARD, WHICH SERVES AS THE GOVERNING BODY, AND TO RATIFY CHANGES TO BY-LAWS OR SIMILAR LEGAL DOCUMENTS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FINANCE COMMITTEE OF THE BOARD REVIEWS THE FORM 990 AND AFTER ANY REVISIONS OR ADDITIONS ARE MADE, THE 990 IS SUBMITTED TO THE FULL BOARD OF DIRECTORS FOR THEIR APPROVAL.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>ANNUALLY ALL BOARD MEMBERS ARE REQUIRED TO SIGN A DOCUMENT STATING THAT THEY HAVE READ AND ARE IN COMPLIANCE WITH THE ORGANIZATION'S CONFLICT OF INTEREST POLICY. THE EXECUTIVE DIRECTOR MONITORS BOARD ACTIVITIES TO ASSURE THERE ARE NO CONFLICTS. THE CONFLICT OF INTEREST POLICY IS AS FOLLOWS: NO BOARD MEMBER OR BOARD COMMITTEE MEMBER, OR ANY MEMBER OF HIS/HER FAMILY SHOULD ACCEPT ANY GIFT, ENTERTAINMENT, SERVICE, LOAN, OR PROMISE OF FUTURE BENEFITS FROM ANY PERSON WHO EITHER PERSONALLY OR WHOSE EMPLOYEES MIGHT BENEFIT OR APPEAR TO BENEFIT FROM SUCH BOARD OR COMMITTEE MEMBER'S CONNECTION WITH THE ATHENAEUM OF PHILADELPHIA, UNLESS THE FACTS SUCH BENEFIT, GIFT, SERVICE, OR LOAN ARE DISCLOSED IN GOOD FAITH AND ARE AUTHORIZED BY THE ATHENAEUM BOARD. BOARD AND COMMITTEE MEMBERS ARE EXPECTED TO WORK OUT FOR THEMSELVES THE MOST GRACIOUS METHOD OF DECLINING GIFTS, ENTERTAINMENT, AND BENEFITS THAT DO NOT MEET THIS STANDARD. NO BOARD OR COMMITTEE MEMBERS SHOULD PERFORM, FOR ANY PERSONAL GAIN, SERVICES TO ANY ATHENAEUM OF PHILADELPHIA SUPPLIER OF GOODS OR SERVICES, AS EMPLOYEE, CONSULTANT, OR IN ANY OTHER CAPACITY WHICH PROMISES COMPENSATION OF ANY KIND, UNLESS THE FACTS OF SUCH TRANSACTIONS OR CONTRACTS ARE DISCLOSED IN GOOD FAITH, AND THE BOARD OR COMMITTEE AUTHORIZES SUCH A TRANSACTION. SIMILAR ASSOCIATION BY A FAMILY MEMBER OF THE BOARD OR COMMITTEE MEMBER OR BY ANY OTHER CLOSE RELATIVE MAY BE INAPPROPRIATE. NO BOARD OR COMMITTEE MEMBER OR ANY MEMBER OF HIS/HER FAMILY SHOULD HAVE ANY BENEFICIAL INTEREST IN, OR SUBSTANTIAL OBLIGATION TO ANY ATHENAEUM OF PHILADELPHIA SUPPLIER OF GOODS OR SERVICES OF ANY OTHER ORGANIZATION THAT IS ENGAGED IN DOING BUSINESS WITH OR SERVING THE ATHENAEUM OF PHILADELPHIA UNLESS IT HAS BEEN DETERMINED BY THE BOARD, ON THE BASIS OF FULL DISCLOSURE OF FACTS, THAT SUCH INTEREST DOES NOT GIVE RISE TO A CONFLICT OF INTEREST. THIS POLICY STATEMENT IS NOT INTENDED TO APPLY TO GIFTS AND/OR SIMILAR ENTERTAINMENT OF NOMINAL VALUE THAT CLEARLY ARE IN KEEPING WITH GOOD BUSINESS ETHICS AND DO NOT OBLIGATE THE RECIPIENT. ANY MATTER OF QUESTION OR INTERPRETATION THAT ARISES RELATING TO THIS POLICY SHOULD BE REFERRED TO THE PRESIDENT FOR DECISION AND/OR REFERRAL TO THE BOARD OF DIRECTORS FOR DECISION, WHERE APPROPRIATE. I HAVE RECEIVED, READ AND UNDERSTAND FULLY THE CONFLICT OF INTEREST STATEMENT AND WILL COMPLY WITH THE STATEMENT BY BRINGING ANY POTENTIAL CONFLICT OF INTEREST SITUATIONS TO THE BOARD FOR CONSIDERATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE EXECUTIVE DIRECTOR IS THE TOP MANAGEMENT OFFICIAL OF THE ATHENAEUM OF PHILADELPHIA. PRIOR TO HIRING, THE SALARY WAS DETERMINED WITH THE ADVICE OF THE EXECUTIVE SEARCH CONSULTANT BY RESEARCHING THE FORM 990 OF SIMILAR ORGANIZATIONS IN THE REGION; STUDYING SALARY DATA PUBLISHED BY THE CHRONICLE OF PHILANTHROPY; LOOKING AT LISTINGS IN THE JOB BANK OF THE GREATER PHILADELPHIA CULTURAL ALLIANCE; AND ANALYZING THE ATHENAEUM'S FINANCES. THIS DATA WAS PRESENTED TO THE EXECUTIVE COMMITTEE WHICH SET A GROSS SALARY FIGURE AND BENEFIT PACKAGE THAT SUBSEQUENTLY WAS APPROVED BY THE FULL BOARD. THE BOARD EVALUATES THE PERFORMANCE OF THE EXECUTIVE DIRECTOR. INCREASES IN SALARY ARE CONSIDERED DURING THE PREPARATION OF THE ANNUAL BUDGET.</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 XI, LINE 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>UNREALIZED GAIN ON BENEFICIAL INTEREST IN PERPETUAL TRUST 305,508.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>
