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        <InvestmentEarningsOrLossesAmt>127568</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>21930</OtherExpendituresAmt>
        <EndYearBalanceAmt>2128833</EndYearBalanceAmt>
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      <TermEndowmentBalanceEOYPct>1.00000</TermEndowmentBalanceEOYPct>
      <EndowmentsHeldUnrelatedOrgInd>false</EndowmentsHeldUnrelatedOrgInd>
      <EndowmentsHeldRelatedOrgInd>false</EndowmentsHeldRelatedOrgInd>
      <RelatedOrgListSchRInd>false</RelatedOrgListSchRInd>
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        <BookValueAmt>167902</BookValueAmt>
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        <OtherCostOrOtherBasisAmt>3396634</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>972102</DepreciationAmt>
        <BookValueAmt>2424532</BookValueAmt>
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      <LeaseholdImprovementsGrp>
        <OtherCostOrOtherBasisAmt>969880</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>703830</DepreciationAmt>
        <BookValueAmt>266050</BookValueAmt>
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      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>521810</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>415423</DepreciationAmt>
        <BookValueAmt>106387</BookValueAmt>
      </EquipmentGrp>
      <OtherLandBuildingsGrp>
        <OtherCostOrOtherBasisAmt>139271</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>131652</DepreciationAmt>
        <BookValueAmt>7619</BookValueAmt>
      </OtherLandBuildingsGrp>
      <TotalBookValueLandBuildingsAmt>2972490</TotalBookValueLandBuildingsAmt>
      <TotalRevEtcAuditedFinclStmtAmt>1196423</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>115669</NetUnrealizedGainsInvstAmt>
      <RevenueNotReportedAmt>115669</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>1080754</RevenueSubtotalAmt>
      <TotalRevenuePerForm990Amt>1080754</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>807113</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesSubtotalAmt>807113</ExpensesSubtotalAmt>
      <TotalExpensesPerForm990Amt>807113</TotalExpensesPerForm990Amt>
    </IRS990ScheduleD>
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      <AgrmtProfFundraisingActyInd>false</AgrmtProfFundraisingActyInd>
      <FundraisingEventInformationGrp>
        <Event1Nm>FUNDRAISERS - GARDEN SOCIAL</Event1Nm>
        <GrossReceiptsEvent1Amt>33801</GrossReceiptsEvent1Amt>
        <CharitableContriEvent1Amt>19501</CharitableContriEvent1Amt>
        <GrossRevenueEvent1Amt>14300</GrossRevenueEvent1Amt>
        <FoodAndBeverageEvent1Amt>4379</FoodAndBeverageEvent1Amt>
        <EntertainmentEvent1Amt>150</EntertainmentEvent1Amt>
        <OtherDirectExpensesEvent1Amt>1588</OtherDirectExpensesEvent1Amt>
        <GrossReceiptsTotalAmt>33801</GrossReceiptsTotalAmt>
        <CharitableContributionsTotAmt>19501</CharitableContributionsTotAmt>
        <GrossRevenueTotalEventsAmt>14300</GrossRevenueTotalEventsAmt>
        <FoodAndBeverageTotalEventsAmt>4379</FoodAndBeverageTotalEventsAmt>
        <EntertainmentTotalEventsAmt>150</EntertainmentTotalEventsAmt>
        <OthDirectExpnssTotalEventsAmt>1588</OthDirectExpnssTotalEventsAmt>
        <DirectExpenseSummaryEventsAmt>6117</DirectExpenseSummaryEventsAmt>
        <NetIncomeSummaryAmt>8183</NetIncomeSummaryAmt>
      </FundraisingEventInformationGrp>
    </IRS990ScheduleG>
    <IRS990ScheduleO documentId="IRS990ScheduleO" softwareId="24020490" softwareVersionNum="2024v5.2">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 6</FormAndLineReferenceDesc>
        <ExplanationTxt>THERE IS ONE CLASS OF MEMBERS AT VARIOUS CONTRIBUTIONS LEVELS. WITH THE CORE MEMBERSHIP THEY HAVE THE FOLLOWING BENEFITS:- MEMBERS RECEIVE A FREE COPY OF THE IOWA ARBORETUM QUARTERLY NEWSLETTER.- REDUCED FEES ON CLASSES AND WORKSHOPS- 10% DISCOUNT IN THE ARBORETUM'S GIFT SHOP (EXCEPT FOR WINES AND COMMISSIONED)- RECIPROCAL PRIVILEGES AT MANY BOTANICAL GARDENS AND OTHER ARBORETA.- FREE ADMISSION TO THE IOWA ARBORETUM.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>A COPY OF THE 990 IS SHARED WITH THE TREASURER AND EXECUTIVE DIRECTOR FOR THEIR REVIEW, APPROVAL AND SIGNATURE BEFORE IT IS FILED. THE COPY MAY OR MAY NOT BE FILED BEFORE THE BOARD'S NEXT MEETING, DEPENDING ON THE TIMING OF THE MEETING AND THE DEADLINE FOR THE FILING OF THE 990. THE BOARD REVIEWS THE 990 AT THE NEXT REGULARLY SCHEDULED MEETING OCCURING AFTER ITS COMPLETION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>OFFICERS, DIRECTORS AND EMPLOYEES ANNUALLY DISCLOSE POTENTIAL CONFLICTS OF INTEREST OF THEMSELVES AND THEIR FAMILIES ON A FORM DISTRIBUTED BY THE EXECUTIVE DIRECTOR. THE EXECUTIVE DIRECTOR INSURES THAT ALL FORMS ARE COMPLETED, REVIEWS THEM FOR CONFLICTS AND SUBMITS TO THE BOARD FOR REVIEW ANY FORMS THAT DISCLOSE AN ACTUAL OR POTENTIAL CONFLICT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 15a</FormAndLineReferenceDesc>
        <ExplanationTxt>COMPENSATION OF ALL EMPLOYEES EXCEPT THE EXECUTIVE DIRECTOR IS DETERMINED BY THE EXECUTIVE COMMITTEE WITH INPUT FROM THE EXECUTIVE DIRECTOR INVOLVED IN THE HIRING PROCESS BASED ON FUNDS AVAILABLE. COMPENSATION FOR THE EXECUTIVE DIRECTOR IS DETERMINED ANNUALLY BY THE EXECUTIVE COMMITTEE CONSISTING OF THE PRESIDENT, PRESIDENT-ELECT, VICE PRESIDENT, SECRETARY, TEASURER AND IMMEDIATE PAST PRESIDENT AFTER AN ANNUAL PERFORMANCE REVIEW.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE IOWA ARBORETUM MAKES ITS GOVERNING DOCUMENTS, CONFICT OF INTEREST POLICY, TAX RETURNS, AND FINANICAL STATEMENTS AVAILABLE TO THE PUBLIC UPON REQUEST, VERBALLY, EITHER IN PERSON OR IN WRITING FROM ITS OFFICE IN THE HUGHES EDUCATION CENTER AT 1875 PEACH AVENUE IN MADRID, IOWA.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XI, Line 9</FormAndLineReferenceDesc>
        <ExplanationTxt>PRIOR PERIOD ADJUSTMENT = $7450</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>