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        <PersonNm>MATT HOLLERAN</PersonNm>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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        <PersonNm>MIKE VORIS</PersonNm>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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        <PersonNm>NICK FREEMAN</PersonNm>
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        <PersonNm>PETER VENTIMIGLIA</PersonNm>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>TOM SCOTT</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>CHRISTOPHER HARPER</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>PETER GALLO</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>BILL BRADY</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>ERIN DUFFY</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>FRED HALLER</PersonNm>
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        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
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        <PersonNm>TARA MONTAGUE</PersonNm>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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          <BusinessName>
            <BusinessNameLine1Txt>COAKLEY &amp; WILLIAMS CONSTRUCTION LLC</BusinessNameLine1Txt>
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        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>7475 WISCONSIN AVE SUITE 900</AddressLine1Txt>
            <CityNm>BETHESDA</CityNm>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
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        <ContractorAddress>
          <USAddress>
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          </USAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>RIGHT ANGLE CONTRACTING INC</BusinessNameLine1Txt>
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        <ContractorAddress>
          <USAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>SPECIALIZED MARKETING LTD</BusinessNameLine1Txt>
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        <ContractorAddress>
          <USAddress>
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          </USAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>CGS ARCHITECTS</BusinessNameLine1Txt>
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          <USAddress>
            <AddressLine1Txt>2909 M STREET NW</AddressLine1Txt>
            <CityNm>WASHINGTON</CityNm>
            <StateAbbreviationCd>DC</StateAbbreviationCd>
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          </USAddress>
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      <FundraisingAmt>412380</FundraisingAmt>
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        <BusinessCd>611110</BusinessCd>
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        <ExclusionAmt>158175</ExclusionAmt>
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      <NetGainOrLossInvestmentsGrp>
        <TotalRevenueColumnAmt>571760</TotalRevenueColumnAmt>
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      <NetIncmFromFundraisingEvtGrp>
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        <ExclusionAmt>-200688</ExclusionAmt>
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        <RelatedOrExemptFuncIncomeAmt>70530</RelatedOrExemptFuncIncomeAmt>
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      <MiscellaneousRevenueGrp>
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        <RelatedOrExemptFuncIncomeAmt>126176</RelatedOrExemptFuncIncomeAmt>
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        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
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      <GrantsToDomesticIndividualsGrp>
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        <ProgramServicesAmt>690660</ProgramServicesAmt>
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        <ProgramServicesAmt>1848976</ProgramServicesAmt>
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        <FundraisingAmt>54117</FundraisingAmt>
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        <ManagementAndGeneralAmt>363563</ManagementAndGeneralAmt>
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      <FeesForServicesAccountingGrp>
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        <ManagementAndGeneralAmt>63075</ManagementAndGeneralAmt>
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      <FeesForSrvcInvstMgmntFeesGrp>
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        <ManagementAndGeneralAmt>57358</ManagementAndGeneralAmt>
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        <ManagementAndGeneralAmt>571801</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>17883</ProgramServicesAmt>
        <ManagementAndGeneralAmt>97904</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>586669</ProgramServicesAmt>
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        <ProgramServicesAmt>1290612</ProgramServicesAmt>
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        <ProgramServicesAmt>862777</ProgramServicesAmt>
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        <FundraisingAmt>239151</FundraisingAmt>
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        <ManagementAndGeneralAmt>303621</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
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        <ProgramServicesAmt>423076</ProgramServicesAmt>
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        <ManagementAndGeneralAmt>6088270</ManagementAndGeneralAmt>
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        <EOYAmt>307</EOYAmt>
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        <EOYAmt>239218</EOYAmt>
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        <EOYAmt>143946361</EOYAmt>
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        <EOYAmt>70417695</EOYAmt>
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      <DonorRestrictionNetAssetsGrp>
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        <EOYAmt>40284933</EOYAmt>
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        <EOYAmt>143946361</EOYAmt>
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        <ExplanationTxt>THE DRAW FROM ENDOWMENT IS USED TO SUPPORT GENERAL PROGRAM SERVICES AS WELL AS FOR DESIGNATED PURPOSES, INCLUDING SCHOLARSHIPS, ETHICS FORUMS AND OTHER PROGRAMS (COMMUNITY SERVICE, ACADEMICS, ATHLETICS).</ExplanationTxt>
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        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>9138</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>63464</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>220521</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>TARA MONTAGUE</PersonNm>
        <TitleTxt>ASSISTANT HEAD OF SCHOOL</TitleTxt>
        <BaseCompensationFilingOrgAmt>155500</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>913</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>9330</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>20000</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>185743</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>BILL BRADY</PersonNm>
        <TitleTxt>DIRECTOR OF ATHLETICS</TitleTxt>
        <BaseCompensationFilingOrgAmt>139743</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>1165</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>8631</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>22507</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>172046</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>FRED HALLER</PersonNm>
        <TitleTxt>CHIEF TECHNOLOGY OFFICER</TitleTxt>
        <BaseCompensationFilingOrgAmt>150404</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>1200</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>9000</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>96</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>160700</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 1A</FormAndLineReferenceDesc>
        <ExplanationTxt>TAX GROSS-UP PAYMENTS WERE MADE FOR VARIOUS TAXABLE BENEFITS PROVIDED TO THE HEAD OF SCHOOL. THE HEAD OF SCHOOL HOLDS VARIOUS BUSINESS MEETINGS THROUGHOUT THE YEAR IN HIS RESIDENCE AND THEREFORE, RECEIVES PERSONAL SERVICES TO MAINTAIN THE UPKEEP OF THE RESIDENCE FOR BUSINESS PURPOSES. THESE AMOUNTS ARE TREATED AS NONTAXABLE BENEFITS AND INCLUDED IN PART II COL D. A NON-TAXABLE HOUSING BENEFIT WAS PROVIDED TO INDIVIDUALS AS A CONDITION OF EMPLOYMENT AND FOR THE CONVENIENCE OF THE EMPLOYER. THE FOLLOWING INDIVIDUALS RECEIVED THE HOUSING BENEFIT: JAMES NEILL - $40,000 CHRISTOPHER HARPER - $40,000 PETER GALLO - $40,000 EHREN FEDEROWICZ- $40,000 TARA MONTAGUE - $20,000 ERIN DUFFY - $40,000 BILL BRADY - $40,000</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 4B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE HEAD OF SCHOOL PARTICIPATED IN A 457F PLAN AND RECEIVED A CONTRIBUTION OF $58,994.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleK documentId="RetDoc1053100001">
      <TaxExemptBondsIssuesGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <IssuerName>
          <BusinessNameLine1Txt>MHHEFA SERIES 2022A &amp; 2022B</BusinessNameLine1Txt>
        </IssuerName>
        <BondIssuerEIN>520936091</BondIssuerEIN>
        <BondIssuedDt>2022-03-03</BondIssuedDt>
        <IssuePriceAmt>66000000</IssuePriceAmt>
        <PurposeDesc>SEE SCHEDULE K, PART VI</PurposeDesc>
        <DefeasedInd>1</DefeasedInd>
        <OnBehalfOfIssuerInd>1</OnBehalfOfIssuerInd>
        <PoolFinancingInd>0</PoolFinancingInd>
      </TaxExemptBondsIssuesGrp>
      <TaxExemptBondsProceedsGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <RetiredAmt>3718785</RetiredAmt>
        <TotalProceedsAmt>66000000</TotalProceedsAmt>
        <IssuanceCostsFromProceedsAmt>50001</IssuanceCostsFromProceedsAmt>
        <CapitalExpendituresAmt>61553533</CapitalExpendituresAmt>
        <UnspentAmt>677681</UnspentAmt>
        <SubstantialCompletionYr>2022</SubstantialCompletionYr>
        <RefundingTaxExemptBondsInd>1</RefundingTaxExemptBondsInd>
        <RefundingTaxableBondsInd>1</RefundingTaxableBondsInd>
        <FinalAllocationMadeInd>0</FinalAllocationMadeInd>
        <AdequateBooksAndRecMaintInd>1</AdequateBooksAndRecMaintInd>
      </TaxExemptBondsProceedsGrp>
      <TaxExemptBondsPrivateBusUseGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <OwningBondFinancedPropertyInd>0</OwningBondFinancedPropertyInd>
        <AnyLeaseArrangementsInd>0</AnyLeaseArrangementsInd>
        <MgmtContractBondFincdPropInd>0</MgmtContractBondFincdPropInd>
        <AnyResearchAgreementsInd>0</AnyResearchAgreementsInd>
        <PrivateBusUseByOthersPct>0.00000</PrivateBusUseByOthersPct>
        <PrivateBusConcerningUBIPct>0.00000</PrivateBusConcerningUBIPct>
        <TotalPrivateBusinessUsePct>0.00000</TotalPrivateBusinessUsePct>
        <BondIssMeetPrvtSecPymtTestInd>0</BondIssMeetPrvtSecPymtTestInd>
        <ChangeInUseBondFinancedPropInd>0</ChangeInUseBondFinancedPropInd>
        <ProcsNonqualifiedBondRemdtdInd>1</ProcsNonqualifiedBondRemdtdInd>
      </TaxExemptBondsPrivateBusUseGrp>
      <TaxExemptBondsArbitrageGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <Form8038TFiledInd>0</Form8038TFiledInd>
        <RebateNotDueYetInd>1</RebateNotDueYetInd>
        <ExceptionToRebateInd>0</ExceptionToRebateInd>
        <NoRebateDueInd>0</NoRebateDueInd>
        <VariableRateIssueInd>0</VariableRateIssueInd>
        <HedgeIdentifiedInBksAndRecInd>0</HedgeIdentifiedInBksAndRecInd>
        <GrossProceedsInvestedInGICInd>0</GrossProceedsInvestedInGICInd>
        <GrossProceedsInvestedInd>0</GrossProceedsInvestedInd>
        <WrittenProcToMonitorReqsInd>1</WrittenProcToMonitorReqsInd>
      </TaxExemptBondsArbitrageGrp>
      <ProceduresCorrectiveActionGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <ProceduresCorrectiveActionInd>1</ProceduresCorrectiveActionInd>
      </ProceduresCorrectiveActionGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE K, PART I, LINE A, COLUMN (F) - (I)</FormAndLineReferenceDesc>
        <ExplanationTxt>PART I BOND ISSUE CONSISTS OF: (1) 2022 BOND A - REFINANCE 2011 BOND DEBT AND PROVIDE FIXED FINANCING FOR MASTER PLAN CONSTRUCTION. DEBT UP TO $46,000,000. INTEREST ONLY UNTIL APRIL 2025. COL (G) DEFEASED - YES; COL (H) ON BEHALF OF ISSUER - YES; COL (I) POOLED FINANCING - NO. (2) 2022 BOND B - PROVIDE BRIDGE FINANCING FOR MASTER PLAN CONSTRUCTION PLEDGE RECEIVABLES PAYMENTS. DEBT UP TO $20,000,000. PRINCIPAL DUE AT MATURITY (2032) EXCEPT FOR REQUIRED PREPAYMENTS WITH THE PROCEEDS OF CERTAIN CAPITAL CAMPAIGN PLEDGES. COL (G) DEFEASED - NO; COL (H) ON BEHALF OF ISSUER - NO; COL (I) POOLED FINANCING - NO.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleK>
    <IRS990ScheduleM documentId="RetDoc1042900001">
      <SecuritiesPubliclyTradedGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>28</ContributionCnt>
        <NoncashContributionsRptF990Amt>780159</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FMV</MethodOfDeterminingRevenuesTxt>
      </SecuritiesPubliclyTradedGrp>
      <AnyPropertyThatMustBeHeldInd>0</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>1</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>0</ThirdPartiesUsedInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, COLUMN (B):</FormAndLineReferenceDesc>
        <ExplanationTxt>THE NUMBER IN COLUMN (B) OF PART I REPRESENTS THE NUMBER OF CONTRIBUTORS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 3</FormAndLineReferenceDesc>
        <ExplanationTxt>LANDON SCHOOL DELEGATED MANAGEMENT DUTIES TO THE BUDD GROUP TO MANAGE ITS PLANT OPERATIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 IS PREPARED BY THE OUTSIDE ACCOUNTING FIRM ENGAGED BY THE SCHOOL. THE RETURN IS REVIEWED BY THE PRESIDENT/HEAD OF SCHOOL, CFO, CONTROLLER, AND AUDIT AND RISK MANAGEMENT COMMITTEE BEFORE APPROVAL BY THE AUDIT AND RISK MANAGEMENT COMMITTEE AND MADE AVAILABLE TO THE TRUSTEES VIA A SECURE WEBSITE PORTAL PRIOR TO FILING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>THE CONFLICT OF INTEREST POLICY IS POSTED TO THE BOARD'S SECURE WEBSITE PORTAL. TRUSTEES ARE ASKED TO READ AND SIGN THE POLICY AT THE BEGINNING OF EACH YEAR AND ADVISE THE SECRETARY OF ANY ISSUES THAT MIGHT BE OF CONCERN.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SALARIES OF THE OFFICERS ARE DECIDED BY THE USE OF COMPARABLE SALARY DATA AS PROVIDED BY AISGW AND THE ASSOCIATION OF MARYLAND INDEPENDENT SCHOOLS. IN ADDITION, THE HEAD OF SCHOOL'S COMPENSATION WAS SUBJECT TO APPROVAL BY THE BOARD.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SCHOOL MAKES ITS GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, AND FINANCIAL STATEMENTS AVAILABLE TO THE PUBLIC UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>