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        <PersonNm>LAURA HOFFMAN</PersonNm>
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        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>LISA ELLIS WILLIAMS</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>MATT HOLLERAN</PersonNm>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>MIKE VORIS</PersonNm>
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        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>NICK FREEMAN</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>OLIVIER KAMANDA</PersonNm>
        <TitleTxt>VICE CHAIRMAN</TitleTxt>
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        <OfficerInd>X</OfficerInd>
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      <Form990PartVIISectionAGrp>
        <PersonNm>TOM SCOTT</PersonNm>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>CHRISTOPHER HARPER</PersonNm>
        <TitleTxt>CFO/COO</TitleTxt>
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        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>146263</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>31713</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>PETER GALLO</PersonNm>
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        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>177266</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>72490</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>CHARLES FRANKLIN</PersonNm>
        <TitleTxt>ASSISTANT HEADMASTER</TitleTxt>
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        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>154947</ReportableCompFromOrgAmt>
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        <OtherCompensationAmt>70557</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>ERIN DUFFY</PersonNm>
        <TitleTxt>HEAD OF MIDDLE SCHOOL</TitleTxt>
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        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>141575</ReportableCompFromOrgAmt>
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        <OtherCompensationAmt>70610</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>JOHN BELLASCHI</PersonNm>
        <TitleTxt>DIRECTOR OF ETHICS, SERVICE &amp; LEADERSHIP</TitleTxt>
        <AverageHoursPerWeekRt>60.00</AverageHoursPerWeekRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
        <ReportableCompFromOrgAmt>138911</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>30803</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>NEIL MAGSINO</PersonNm>
        <TitleTxt>INFORMATION TECHNOLOGY MANAGER</TitleTxt>
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        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>9845</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>SARAH POWERS</PersonNm>
        <TitleTxt>DIRECTOR OF ADMISSIONS</TitleTxt>
        <AverageHoursPerWeekRt>60.00</AverageHoursPerWeekRt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>73248</OtherCompensationAmt>
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      <TotalOtherCompensationAmt>456796</TotalOtherCompensationAmt>
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      <TotalCompGreaterThan150KInd>1</TotalCompGreaterThan150KInd>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>COX GRAAE SPACK ARCHITECTS PC</BusinessNameLine1Txt>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>2909 M ST NW</AddressLine1Txt>
            <CityNm>WASHINGTON</CityNm>
            <StateAbbreviationCd>DC</StateAbbreviationCd>
            <ZIPCd>20007</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>ARCHITECTURAL SERVICES</ServicesDesc>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>SAGE DINING SERVICES INC</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>1402 YORK ROAD</AddressLine1Txt>
            <CityNm>LUTHERVILLE</CityNm>
            <StateAbbreviationCd>MD</StateAbbreviationCd>
            <ZIPCd>21093</ZIPCd>
          </USAddress>
        </ContractorAddress>
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        <CompensationAmt>948070</CompensationAmt>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>RIGHT ANGLE CONTRACTING INC</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>107 CARPENTER DR STE 120</AddressLine1Txt>
            <CityNm>STERLING</CityNm>
            <StateAbbreviationCd>VA</StateAbbreviationCd>
            <ZIPCd>20176</ZIPCd>
          </USAddress>
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        <ServicesDesc>CONTRACTOR</ServicesDesc>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>COAKLEY &amp; WILLIAMS CONSTRUCTION LLC</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>7475 WISCONSIN AVE SUITE 900</AddressLine1Txt>
            <CityNm>BETHESDA</CityNm>
            <StateAbbreviationCd>MD</StateAbbreviationCd>
            <ZIPCd>20814</ZIPCd>
          </USAddress>
        </ContractorAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>BOLANA ENTERPRISES INC</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>10739 TUCKER STREET SUITE 270</AddressLine1Txt>
            <CityNm>BELTSVILLE</CityNm>
            <StateAbbreviationCd>MD</StateAbbreviationCd>
            <ZIPCd>20705</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>FACILITY SERVICES (CLEANING/JANITORIAL)</ServicesDesc>
        <CompensationAmt>342518</CompensationAmt>
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      <CntrctRcvdGreaterThan100KCnt>28</CntrctRcvdGreaterThan100KCnt>
      <FundraisingAmt>103345</FundraisingAmt>
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      <NoncashContributionsAmt>1729398</NoncashContributionsAmt>
      <TotalContributionsAmt>18867639</TotalContributionsAmt>
      <ProgramServiceRevenueGrp>
        <Desc>TUITION &amp; FEES</Desc>
        <BusinessCd>611710</BusinessCd>
        <TotalRevenueColumnAmt>32198425</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>32198425</RelatedOrExemptFuncIncomeAmt>
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      <ProgramServiceRevenueGrp>
        <Desc>AUXILIARY SERVICES</Desc>
        <BusinessCd>900099</BusinessCd>
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        <RelatedOrExemptFuncIncomeAmt>2116294</RelatedOrExemptFuncIncomeAmt>
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      <TotalProgramServiceRevenueAmt>34314719</TotalProgramServiceRevenueAmt>
      <InvestmentIncomeGrp>
        <TotalRevenueColumnAmt>526518</TotalRevenueColumnAmt>
        <ExclusionAmt>526518</ExclusionAmt>
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      <GrossRentsGrp>
        <RealAmt>215231</RealAmt>
      </GrossRentsGrp>
      <LessRentalExpensesGrp>
        <RealAmt>0</RealAmt>
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      <RentalIncomeOrLossGrp>
        <RealAmt>215231</RealAmt>
      </RentalIncomeOrLossGrp>
      <NetRentalIncomeOrLossGrp>
        <TotalRevenueColumnAmt>215231</TotalRevenueColumnAmt>
        <ExclusionAmt>215231</ExclusionAmt>
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      <GrossAmountSalesAssetsGrp>
        <SecuritiesAmt>2160</SecuritiesAmt>
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      <LessCostOthBasisSalesExpnssGrp>
        <SecuritiesAmt>0</SecuritiesAmt>
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      <GainOrLossGrp>
        <SecuritiesAmt>2160</SecuritiesAmt>
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      <NetGainOrLossInvestmentsGrp>
        <TotalRevenueColumnAmt>2160</TotalRevenueColumnAmt>
        <ExclusionAmt>2160</ExclusionAmt>
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      <ContriRptFundraisingEventAmt>103345</ContriRptFundraisingEventAmt>
      <FundraisingDirectExpensesAmt>277929</FundraisingDirectExpensesAmt>
      <NetIncmFromFundraisingEvtGrp>
        <TotalRevenueColumnAmt>177034</TotalRevenueColumnAmt>
        <ExclusionAmt>177034</ExclusionAmt>
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      <CostOfGoodsSoldAmt>234067</CostOfGoodsSoldAmt>
      <NetIncomeOrLossGrp>
        <TotalRevenueColumnAmt>132772</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>132772</RelatedOrExemptFuncIncomeAmt>
      </NetIncomeOrLossGrp>
      <OtherRevenueMiscGrp>
        <Desc>OTHER INCOME</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>98231</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>98231</RelatedOrExemptFuncIncomeAmt>
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      <OtherRevenueTotalAmt>98231</OtherRevenueTotalAmt>
      <TotalRevenueGrp>
        <TotalRevenueColumnAmt>54334304</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>34545722</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>920943</ExclusionAmt>
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      <GrantsToDomesticIndividualsGrp>
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        <ProgramServicesAmt>5425248</ProgramServicesAmt>
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        <ProgramServicesAmt>988019</ProgramServicesAmt>
        <ManagementAndGeneralAmt>127752</ManagementAndGeneralAmt>
        <FundraisingAmt>53838</FundraisingAmt>
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        <ProgramServicesAmt>12323006</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1601447</ManagementAndGeneralAmt>
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      <PensionPlanContributionsGrp>
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        <ProgramServicesAmt>583306</ProgramServicesAmt>
        <ManagementAndGeneralAmt>71448</ManagementAndGeneralAmt>
        <FundraisingAmt>25885</FundraisingAmt>
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        <ProgramServicesAmt>1763429</ProgramServicesAmt>
        <ManagementAndGeneralAmt>216000</ManagementAndGeneralAmt>
        <FundraisingAmt>78253</FundraisingAmt>
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        <ProgramServicesAmt>974096</ProgramServicesAmt>
        <ManagementAndGeneralAmt>119316</ManagementAndGeneralAmt>
        <FundraisingAmt>43226</FundraisingAmt>
      </PayrollTaxesGrp>
      <FeesForServicesLegalGrp>
        <TotalAmt>56713</TotalAmt>
        <ManagementAndGeneralAmt>56713</ManagementAndGeneralAmt>
      </FeesForServicesLegalGrp>
      <FeesForServicesAccountingGrp>
        <TotalAmt>58425</TotalAmt>
        <ManagementAndGeneralAmt>58425</ManagementAndGeneralAmt>
      </FeesForServicesAccountingGrp>
      <FeesForSrvcInvstMgmntFeesGrp>
        <TotalAmt>48165</TotalAmt>
        <ManagementAndGeneralAmt>48165</ManagementAndGeneralAmt>
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        <TotalAmt>698349</TotalAmt>
        <ProgramServicesAmt>307597</ProgramServicesAmt>
        <ManagementAndGeneralAmt>301502</ManagementAndGeneralAmt>
        <FundraisingAmt>89250</FundraisingAmt>
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      <AdvertisingGrp>
        <TotalAmt>127340</TotalAmt>
        <ProgramServicesAmt>9961</ProgramServicesAmt>
        <ManagementAndGeneralAmt>94543</ManagementAndGeneralAmt>
        <FundraisingAmt>22836</FundraisingAmt>
      </AdvertisingGrp>
      <OfficeExpensesGrp>
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        <ProgramServicesAmt>635318</ProgramServicesAmt>
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        <FundraisingAmt>124656</FundraisingAmt>
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      <OccupancyGrp>
        <TotalAmt>948093</TotalAmt>
        <ProgramServicesAmt>948093</ProgramServicesAmt>
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        <ProgramServicesAmt>374219</ProgramServicesAmt>
        <ManagementAndGeneralAmt>2075</ManagementAndGeneralAmt>
        <FundraisingAmt>46163</FundraisingAmt>
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        <ProgramServicesAmt>141981</ProgramServicesAmt>
        <ManagementAndGeneralAmt>13767</ManagementAndGeneralAmt>
        <FundraisingAmt>217741</FundraisingAmt>
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        <ProgramServicesAmt>24058</ProgramServicesAmt>
        <ManagementAndGeneralAmt>54577</ManagementAndGeneralAmt>
        <FundraisingAmt>23521</FundraisingAmt>
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        <ProgramServicesAmt>1019778</ProgramServicesAmt>
        <ManagementAndGeneralAmt>158026</ManagementAndGeneralAmt>
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        <ManagementAndGeneralAmt>280475</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>1684479</ProgramServicesAmt>
        <ManagementAndGeneralAmt>31937</ManagementAndGeneralAmt>
        <FundraisingAmt>452</FundraisingAmt>
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      <OtherExpensesGrp>
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        <ProgramServicesAmt>80</ProgramServicesAmt>
        <ManagementAndGeneralAmt>937277</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
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        <ProgramServicesAmt>844738</ProgramServicesAmt>
        <ManagementAndGeneralAmt>80699</ManagementAndGeneralAmt>
        <FundraisingAmt>162</FundraisingAmt>
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      <OtherExpensesGrp>
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        <ProgramServicesAmt>420195</ProgramServicesAmt>
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      <AllOtherExpensesGrp>
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        <ProgramServicesAmt>413553</ProgramServicesAmt>
        <ManagementAndGeneralAmt>254958</ManagementAndGeneralAmt>
        <FundraisingAmt>262956</FundraisingAmt>
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      <TotalFunctionalExpensesGrp>
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        <ProgramServicesAmt>28881154</ProgramServicesAmt>
        <ManagementAndGeneralAmt>4950118</ManagementAndGeneralAmt>
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        <EOYAmt>500</EOYAmt>
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        <EOYAmt>22825750</EOYAmt>
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        <EOYAmt>12989643</EOYAmt>
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        <EOYAmt>78056</EOYAmt>
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        <EOYAmt>221085</EOYAmt>
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        <EOYAmt>49024</EOYAmt>
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      <PrepaidExpensesDefrdChargesGrp>
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        <EOYAmt>683130</EOYAmt>
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      <LandBldgEquipBasisNetGrp>
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        <EOYAmt>22677565</EOYAmt>
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      <InvestmentsPubTradedSecGrp>
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        <EOYAmt>20635153</EOYAmt>
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        <EOYAmt>222716</EOYAmt>
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        <BOYAmt>66346908</BOYAmt>
        <EOYAmt>80382622</EOYAmt>
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      <AccountsPayableAccrExpnssGrp>
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        <EOYAmt>2987413</EOYAmt>
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      <DeferredRevenueGrp>
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        <EOYAmt>12469091</EOYAmt>
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      <TaxExemptBondLiabilitiesGrp>
        <BOYAmt>4164696</BOYAmt>
        <EOYAmt>3718785</EOYAmt>
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      <LoansFromOfficersDirectorsGrp>
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        <EOYAmt>0</EOYAmt>
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      <MortgNotesPyblScrdInvstPropGrp>
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        <EOYAmt>511560</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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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SCHOOL IS EXEMPT FROM FEDERAL INCOME TAXES UNDER SECTION 501(C)(3) OF THE INTERNAL REVENUE CODE AND HAS BEEN CLASSIFIED AS AN ORGANIZATION THAT IS NOT A PRIVATE FOUNDATION. HOWEVER, INCOME FROM CERTAIN ACTIVITIES NOT DIRECTLY RELATED TO THE SCHOOL'S TAX-EXEMPT PURPOSE IS SUBJECTED TO TAXATION AS UNRELATED BUSINESS INCOME. THE SCHOOL REPRESENTS THAT THERE IS NO UNRELATED BUSINESS INCOME FOR THE YEARS ENDED JUNE 30, 2022 AND 2021, AND ACCORDINGLY, NO PROVISION FOR INCOME TAXES IS REQUIRED IN THE ACCOMPANYING FINANCIAL STATEMENTS. FOR THE YEARS ENDED JUNE 30, 2022 AND 2021, THE MANAGEMENT OF THE SCHOOL DID NOT IDENTIFY ANY UNCERTAIN TAX POSITIONS THAT QUALIFY FOR EITHER RECOGNITION OR DISCLOSURE IN THE FINANCIAL STATEMENTS. THE SCHOOL'S TAX RETURNS ARE SUBJECT TO REVIEW AND EXAMINATION BY FEDERAL, STATE AND LOCAL AUTHORITIES FOR A PERIOD OF THREE YEARS. WHILE NO INCOME TAX RETURNS ARE CURRENTLY BEING EXAMINED, TAX YEARS SINCE 2018 REMAIN OPEN.</ExplanationTxt>
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        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>9446</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>61111</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>225504</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>ERIN DUFFY</PersonNm>
        <TitleTxt>HEAD OF MIDDLE SCHOOL</TitleTxt>
        <BaseCompensationFilingOrgAmt>140917</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>658</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>8718</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>61892</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>212185</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>CHRISTOPHER HARPER</PersonNm>
        <TitleTxt>CFO/COO</TitleTxt>
        <BaseCompensationFilingOrgAmt>145718</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>545</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>31713</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>177976</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>JOHN BELLASCHI</PersonNm>
        <TitleTxt>DIRECTOR OF ETHICS, SERVICE &amp; LEADER</TitleTxt>
        <BaseCompensationFilingOrgAmt>137224</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>1687</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>8090</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>22713</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>169714</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>NEIL MAGSINO</PersonNm>
        <TitleTxt>INFORMATION TECHNOLOGY MANAGER</TitleTxt>
        <BaseCompensationFilingOrgAmt>140627</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>833</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>8455</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>1390</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>151305</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, JAMES NEILL. JAMES NEILL RECEIVED NON-TAXABLE PERSONAL SERVICES IN THE AMOUNT OF $7,050. A NON-TAXABLE HOUSING BENEFIT WAS PROVIDED TO INDIVIDUALS AS A CONDITION OF EMPLOYMENT. THE FOLLOWING INDIVIDUALS RECEIVED THE HOUSING BENEFIT: JAMES NEILL - $40,000 CHRISTOPHER HARPER - $20,000 PETER GALLO - $40,000 CHARLES FRANKLIN - $40,000 SARAH POWERS - $40,000 ERIN DUFFY - $40,000</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>
        <BondDefeasedAmt>3718785</BondDefeasedAmt>
        <TotalProceedsAmt>66000000</TotalProceedsAmt>
        <IssuanceCostsFromProceedsAmt>50001</IssuanceCostsFromProceedsAmt>
        <UnspentAmt>62231214</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>
        <BondIssMeetPrvtSecPymtTestInd>0</BondIssMeetPrvtSecPymtTestInd>
        <ChangeInUseBondFinancedPropInd>0</ChangeInUseBondFinancedPropInd>
        <ProcsNonqualifiedBondRemdtdInd>1</ProcsNonqualifiedBondRemdtdInd>
      </TaxExemptBondsPrivateBusUseGrp>
      <TaxExemptBondsArbitrageGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <Form8038TFiledInd>1</Form8038TFiledInd>
        <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. INTEREST ONLY UNTIL APRIL 2025. 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>24</ContributionCnt>
        <NoncashContributionsRptF990Amt>1729398</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>AVERAGE</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 CONTRIBUTIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 3</FormAndLineReferenceDesc>
        <ExplanationTxt>THE LANDON SCHOOL DELEGATED MANAGEMENT DUTIES TO THE BUDD GROUP TO MANAGE ITS PLANT OPERATIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 4</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BY-LAWS WERE AMENDED, AND THE CHANGES INCLUDED (I) UPDATING THE SCHOOL'S MISSION, (II) REDUCING THE MINIMUM NUMBER OF TRUSTEES FROM 23 TO 17, (III) ALLOWING TRUSTEE WHO ARE APPOINTED TO FILL A VACANCY MID-TERM TO SERVE TWO FULL THREE-YEAR TERMS, AND (IV) OTHER NON-MATERIAL, ADMINISTRATIVE CHANGES TO BRING THE BOARD'S PROCESSES UP TO DATE, INCLUDING FACILITATING VIDEO-CONFERENCING AND VOTING BY EMAIL.</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/HEADMASTER, CFO, CONTROLLER, AND AUDIT AND RISK MANAGEMENT COMMITTEE BEFORE BEING MADE AVAILABLE TO THE TRUSTEES VIA A SECURE WEBSITE PORTAL.</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.</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>
