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      <Form990PartVIISectionAGrp>
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      <Form990PartVIISectionAGrp>
        <BusinessName>
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      <Form990PartVIISectionAGrp>
        <BusinessName>
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        <BusinessName>
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      <ContractorCompensationGrp>
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        <FundraisingAmt>35186</FundraisingAmt>
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      <OtherExpensesGrp>
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        <ProgramServicesAmt>18879</ProgramServicesAmt>
        <ManagementAndGeneralAmt>81751</ManagementAndGeneralAmt>
        <FundraisingAmt>724</FundraisingAmt>
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      <OtherExpensesGrp>
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        <ManagementAndGeneralAmt>31543</ManagementAndGeneralAmt>
        <FundraisingAmt>11564</FundraisingAmt>
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      <OtherExpensesGrp>
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        <ManagementAndGeneralAmt>20073</ManagementAndGeneralAmt>
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        <EOYAmt>42684620</EOYAmt>
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        <DeferredCompensationFlngOrgAmt>13876</DeferredCompensationFlngOrgAmt>
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        <TotalCompensationFilingOrgAmt>163239</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <BusinessName>
          <BusinessNameLine1Txt>Karen Joostema</BusinessNameLine1Txt>
        </BusinessName>
        <TitleTxt>Director of Communications &amp; Marketing</TitleTxt>
        <BaseCompensationFilingOrgAmt>120303</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>13933</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>43875</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>178111</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <BusinessName>
          <BusinessNameLine1Txt>Andre Withers</BusinessNameLine1Txt>
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        <TitleTxt>Assistant Head of School</TitleTxt>
        <BaseCompensationFilingOrgAmt>117941</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>13848</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>71117</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>202906</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <BusinessName>
          <BusinessNameLine1Txt>Ann Weymouth</BusinessNameLine1Txt>
        </BusinessName>
        <TitleTxt>Human Resources Director</TitleTxt>
        <BaseCompensationFilingOrgAmt>104660</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>11962</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>41370</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>157992</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 1a Housing allowance or residence for personal use</FormAndLineReferenceDesc>
        <ExplanationTxt>THE VALUE OF HOUSING PROVIDED TO EMPLOYEES WHO LIVE ON CAMPUS IS BASED ON LOCAL REAL ESTATE RENTAL RATES FOR SIMILAR SIZED HOUSING AND IS INCLUDED IN TOTAL COMPENSATION FOR FORM 990 PURPOSES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 1a Personal services</FormAndLineReferenceDesc>
        <ExplanationTxt>THE COMPENSATION OF THE EMPLOYEES (OFFICERS) IS REVIEWED AND APPROVED BY THE BOARD OF TRUSTEES OF THE SCHOOL PROVIDED THAT PERSONS WITH CONFLICTS OF INTEREST WITH RESPECT TO THE COMPENSATION AGREEMENT AT ISSUE ARE NOT INVOLVED IN THIS REVIEW AND APPROVAL. THE COMPENSATION OF THE PERSON IS REVIEWED AND APPROVED USING DATA AS TO COMPARABLE COMPENSATION FOR SIMILARLY QUALIFIED PERSONS IN FUNCTIONALLY COMPARABLE POSITIONS AT SIMILARLY SITUATED ORGANIZATIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 4b Supplemental nonqualified retirement plan</FormAndLineReferenceDesc>
        <ExplanationTxt>The School maintains a non-qualified deferred compensation plan that complies with Section 457(b) of the Internal Revenue Code. It is an unfunded plan maintained primarily for the purpose of providing deferred compensation benefits for a select group of management or highly compensated employees. Participation in this plan is limited to the Head of School and Senior Administrative Team.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleK documentId="IRS990ScheduleK1" softwareId="21014044" softwareVersionNum="2021v4.2">
      <TaxExemptBondsIssuesGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <IssuerName>
          <BusinessNameLine1Txt>FAIRFAX COUNTY ECONOMIC DEVELOPMENT AUTHORITY</BusinessNameLine1Txt>
        </IssuerName>
        <BondIssuerEIN>546001266</BondIssuerEIN>
        <CUSIPNum>000000000</CUSIPNum>
        <BondIssuedDt>2017-08-01</BondIssuedDt>
        <IssuePriceAmt>18603416</IssuePriceAmt>
        <PurposeDesc>TO FULLY REDEEM SERIES 2010 BOND AND TO PAY OFF LINE CREDIT</PurposeDesc>
        <DefeasedInd>false</DefeasedInd>
        <OnBehalfOfIssuerInd>false</OnBehalfOfIssuerInd>
        <PoolFinancingInd>false</PoolFinancingInd>
      </TaxExemptBondsIssuesGrp>
      <TaxExemptBondsProceedsGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <TotalProceedsAmt>19302670</TotalProceedsAmt>
        <IssuanceCostsFromProceedsAmt>329697</IssuanceCostsFromProceedsAmt>
        <OtherSpentProceedsAmt>3592973</OtherSpentProceedsAmt>
        <SubstantialCompletionYr>2017</SubstantialCompletionYr>
        <RefundingTaxExemptBondsInd>true</RefundingTaxExemptBondsInd>
        <RefundingTaxableBondsInd>false</RefundingTaxableBondsInd>
        <FinalAllocationMadeInd>true</FinalAllocationMadeInd>
        <AdequateBooksAndRecMaintInd>true</AdequateBooksAndRecMaintInd>
      </TaxExemptBondsProceedsGrp>
      <TaxExemptBondsPrivateBusUseGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <OwningBondFinancedPropertyInd>false</OwningBondFinancedPropertyInd>
        <AnyLeaseArrangementsInd>true</AnyLeaseArrangementsInd>
        <MgmtContractBondFincdPropInd>false</MgmtContractBondFincdPropInd>
        <AnyResearchAgreementsInd>false</AnyResearchAgreementsInd>
        <PrivateBusConcerningUBIPct>0.0002</PrivateBusConcerningUBIPct>
        <TotalPrivateBusinessUsePct>0.0002</TotalPrivateBusinessUsePct>
        <BondIssMeetPrvtSecPymtTestInd>false</BondIssMeetPrvtSecPymtTestInd>
        <ChangeInUseBondFinancedPropInd>false</ChangeInUseBondFinancedPropInd>
        <ProcsNonqualifiedBondRemdtdInd>false</ProcsNonqualifiedBondRemdtdInd>
      </TaxExemptBondsPrivateBusUseGrp>
      <TaxExemptBondsArbitrageGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <Form8038TFiledInd>false</Form8038TFiledInd>
        <RebateNotDueYetInd>false</RebateNotDueYetInd>
        <ExceptionToRebateInd>false</ExceptionToRebateInd>
        <NoRebateDueInd>false</NoRebateDueInd>
        <VariableRateIssueInd>true</VariableRateIssueInd>
        <HedgeIdentifiedInBksAndRecInd>true</HedgeIdentifiedInBksAndRecInd>
        <HedgeProviderName>
          <BusinessNameLine1Txt>MORGAN STANLEY</BusinessNameLine1Txt>
        </HedgeProviderName>
        <TermOfHedgePct>30.0</TermOfHedgePct>
        <SuperintegratedHedgeInd>true</SuperintegratedHedgeInd>
        <HedgeTerminatedInd>false</HedgeTerminatedInd>
        <GrossProceedsInvestedInGICInd>false</GrossProceedsInvestedInGICInd>
        <GrossProceedsInvestedInd>false</GrossProceedsInvestedInd>
        <WrittenProcToMonitorReqsInd>false</WrittenProcToMonitorReqsInd>
      </TaxExemptBondsArbitrageGrp>
      <ProceduresCorrectiveActionGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <ProceduresCorrectiveActionInd>false</ProceduresCorrectiveActionInd>
      </ProceduresCorrectiveActionGrp>
    </IRS990ScheduleK>
    <IRS990ScheduleM documentId="IRS990ScheduleM" softwareId="21014044" softwareVersionNum="2021v4.2">
      <SecuritiesPubliclyTradedGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>11</ContributionCnt>
        <NoncashContributionsRptF990Amt>162013</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>Market value</MethodOfDeterminingRevenuesTxt>
      </SecuritiesPubliclyTradedGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>HORSE</Desc>
        <ContributionCnt>1</ContributionCnt>
        <NoncashContributionsRptF990Amt>5000</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>NONE</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>BOARD TRAVEL</Desc>
        <ContributionCnt>1</ContributionCnt>
        <NoncashContributionsRptF990Amt>1058</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>Market value</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <Form8283ReceivedCnt>0</Form8283ReceivedCnt>
      <AnyPropertyThatMustBeHeldInd>false</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>true</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>true</ThirdPartiesUsedInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule M, Part I, Line 32b Third parties used to solicit, process, or sell noncash contributions</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SCHOOL USES A THIRD PARTY BROKERAGE FIRM TO SELL PUBLICLY TRADED STOCKS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule M, Part I Explanations of reporting method for number of contributions</FormAndLineReferenceDesc>
        <ExplanationTxt>Securities - Publicly traded - THE NUMBER IN COLUMN (B) REPRESENTS THE NUMBER OF CONTRIBUTIONS RECEIVED. Other - HORSE THE NUMBER IN COLUMN (B) REPRESENTS THE NUMBER OF CONTRIBUTIONS RECEIVED. Other - BOARD TRAVEL THE NUMBER IN COLUMN (B) REPRESENTS THE NUMBER OF CONTRIBUTIONS RECEIVED.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="IRS990ScheduleO" softwareId="21014044" softwareVersionNum="2021v4.2">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 11b Review of form 990 by governing body</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 IS REVIEWED BY THE AUDIT COMMITTEE, AND THEN THE FORM 990 IS PROVIDED TO ALL MEMBERS OF THE BOARD OF TRUSTEES PRIOR TO FILING THE RETURN.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 12c Conflict of interest policy</FormAndLineReferenceDesc>
        <ExplanationTxt>AT THE FIRST BOARD MEETING EACH FISCAL YEAR, BOARD MEMBERS AND KEY EMPLOYEES ARE GIVEN A FORM TO FILL OUT AND SIGN.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 15a Process to establish compensation of top management official</FormAndLineReferenceDesc>
        <ExplanationTxt>THE COMPENSATION OF THE PERSON IS REVIEWED AND APPROVED BY THE BOARD OF TRUSTEES OF THE SCHOOL PROVIDED THAT PERSONS WITH CONFLICTS OF INTEREST WITH RESPECT TO THE COMPENSATION ARRANGEMENT AT ISSUE ARE NOT INVOLVED IN THIS REVIEW AND APPROVAL. THE COMPENSATION OF THE PERSON IS REVIEWED AND APPROVED USING DATA AS TO COMPARABLE COMPENSATION FOR SIMILARLY QUALIFIED PERSONS IN FUNCTIONALLY COMPARABLE POSITIONS AT SIMILIARLY SITUATED ORGANIZATIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 19 Required documents available to the public</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 IS MADE AVAILABLE UPON REQUEST. OTHER ORGANIZATIONAL DOCUMENTS ARE NOT AVAILABLE TO THE GENERAL PUBLIC.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XI, Line 9 Other changes in net assets or fund balances</FormAndLineReferenceDesc>
        <ExplanationTxt>Gain on interest rate swap agreement - 1645484; Change in value of split interest agreements - -112808;</ExplanationTxt>
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    </IRS990ScheduleO>
  </ReturnData>
</Return>
