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        <BeginningYearBalanceAmt>4210131</BeginningYearBalanceAmt>
        <InvestmentEarningsOrLossesAmt>655595</InvestmentEarningsOrLossesAmt>
        <GrantsOrScholarshipsAmt>42534</GrantsOrScholarshipsAmt>
        <OtherExpendituresAmt>732023</OtherExpendituresAmt>
        <EndYearBalanceAmt>4091169</EndYearBalanceAmt>
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      <BoardDesignatedBalanceEOYPct>0.00000</BoardDesignatedBalanceEOYPct>
      <PrmnntEndowmentBalanceEOYPct>1.00000</PrmnntEndowmentBalanceEOYPct>
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        <BookValueAmt>2854826</BookValueAmt>
      </LandGrp>
      <BuildingsGrp>
        <OtherCostOrOtherBasisAmt>33456039</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>10732889</DepreciationAmt>
        <BookValueAmt>22723150</BookValueAmt>
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      <LeaseholdImprovementsGrp>
        <OtherCostOrOtherBasisAmt>1614253</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>1276764</DepreciationAmt>
        <BookValueAmt>337489</BookValueAmt>
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      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>1636880</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>1210923</DepreciationAmt>
        <BookValueAmt>425957</BookValueAmt>
      </EquipmentGrp>
      <OtherLandBuildingsGrp>
        <OtherCostOrOtherBasisAmt>1119391</OtherCostOrOtherBasisAmt>
        <BookValueAmt>1119391</BookValueAmt>
      </OtherLandBuildingsGrp>
      <TotalBookValueLandBuildingsAmt>27460813</TotalBookValueLandBuildingsAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>CAPITAL LEASE OBLIGATION</Desc>
      </OtherLiabilitiesOrgGrp>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>23368013</TotalRevEtcAuditedFinclStmtAmt>
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      <RevenueNotReportedAmt>40648</RevenueNotReportedAmt>
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      <InvestmentExpensesNotIncldAmt>38557</InvestmentExpensesNotIncldAmt>
      <OtherRevenuesNotIncludedAmt>-688850</OtherRevenuesNotIncludedAmt>
      <RevenueNotReportedFinclStmtAmt>-650293</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>22677072</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>22771093</TotExpnsEtcAuditedFinclStmtAmt>
      <DonatedServicesUseFcltsAmt>40648</DonatedServicesUseFcltsAmt>
      <OtherExpensesIncludedAmt>684557</OtherExpensesIncludedAmt>
      <ExpensesNotReportedAmt>725205</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>22045888</ExpensesSubtotalAmt>
      <InvestmentExpensesNotIncld2Amt>38557</InvestmentExpensesNotIncld2Amt>
      <ExpensesNotRptFinclStmtAmt>38557</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>22084445</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt II, Line 9</FormAndLineReferenceDesc>
        <ExplanationTxt>THERE IS NO REVENUE OR EXPENSE TO REPORT FOR THE CURRENT YEAR. THE LAB SCHOOL IS ONLY REQUIRED TO MAINTAIN IT IN ITS NATURAL HABITAT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt V, Line 4</FormAndLineReferenceDesc>
        <ExplanationTxt>PERMANENTLY RESTRICTED NET ASSETS ARE RESTRICTED TO INVESTMENT IN PERPETUITY, THE INCOME FROM WHICH IS EXPENDABLE TO SUPPORT GENERAL OPERATIONS, FINANCIAL AID AND PROFESSIONAL DEVELOPMENT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt X, Line 2</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SCHOOL ADOPTED THE RECOMMENDATIONS OF THE FINANCIAL ACCOUNTING STANDARDS BOARD (FASB) IN ITS ACCOUNTING STANDARDS CODIFICATION (ASC) FOR ACCOUNTING FOR UNCERTAINTY IN INCOME TAXES WITHOUT ANY MATERIAL EFFECT TO THE FINANCIAL STATEMENTS. THESE RECOMMENDATIONS CLARIFY THE ACCOUNTING FOR UNCERTAINTY IN INCOME TAXES BY PRESCRIBING THE RECOGNITION THRESHOLD A TAX POSITION IS REQUIRED TO MEET BEFORE BEING RECOGNIZED IN THE FINANCIAL STATEMENTS. THEY ALSO PROVIDE GUIDANCE ON DE-RECOGNITION, CLASSIFICATION, INTEREST AND PENALTIES, ACCOUNTING IN INTERIM PERIODS, DISCLOSURE, AND TRANSITION. INCOME TAX BENEFITS ARE RECOGNIZED FOR INCOME TAX POSITIONS TAKEN OR EXPECTED TO BE TAKEN IN A TAX RETURN, ONLY WHEN IT IS DETERMINED THAT THE INCOME TAX POSITION WILL MORE-LIKELY-THAN-NOT BE SUSTAINED UPON EXAMINATION BY TAXING AUTHORITIES. THE SCHOOL HAS ANALYZED TAX POSITIONS TAKEN FOR FILING WITH THE INTERNAL REVENUE SERVICE AND ALL STATE JURISDICTIONS WHERE IT OPERATES. THE SCHOOL BELIEVES THAT INCOME TAX FILING POSITIONS WILL BE SUSTAINED UPON EXAMINATION AND DOES NOT ANTICIPATE ANY ADJUSTMENTS THAT WOULD RESULT IN A MATERIAL ADVERSE AFFECT ON THE SCHOOL'S FINANCIAL CONDITION, RESULTS OF OPERATIONS OR CASH FLOWS. ACCORDINGLY, THE SCHOOL HAS NOT RECORDED ANY RESERVES, OR RELATED ACCRUALS FOR INTEREST AND PENALTIES FOR UNCERTAIN INCOME TAX POSITIONS AT JULY 31, 2018 AND 2017. WITH FEW EXCEPTIONS, THE SCHOOL'S RETURNS REMAIN OPEN FOR THREE YEARS FOR FEDERAL AND STATE EXAMINATIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt XI, Line 4b</FormAndLineReferenceDesc>
        <ExplanationTxt>SPECIAL EVENT EXPENSES ($294,601) NETTED WITH REVENUE IN PART VIII, RENTAL EXPENSES ($389,956) NETTED WITH REVENUE IN 990 PART VIII AND ($4,293) OF REALIZED LOSSES REPORTED IN 990 PART VIII BUT NOT IN LINE 1.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt XII, Line 2d</FormAndLineReferenceDesc>
        <ExplanationTxt>SPECIAL EVENT EXPENSES $294,601 AND RENTAL EXPENSES $389,956</ExplanationTxt>
      </SupplementalInformationDetail>
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      <NondiscriminatoryPolicyStmtInd>true</NondiscriminatoryPolicyStmtInd>
      <PolicyStmtInBrochuresEtcInd>true</PolicyStmtInBrochuresEtcInd>
      <PlcyPblczdViaBroadcastMediaInd>true</PlcyPblczdViaBroadcastMediaInd>
      <MaintainRacialCompRecsInd>true</MaintainRacialCompRecsInd>
      <MaintainScholarshipsRecsInd>true</MaintainScholarshipsRecsInd>
      <MaintainCpyOfBrochuresEtcInd>true</MaintainCpyOfBrochuresEtcInd>
      <MaintainCpyOfAllSolInd>true</MaintainCpyOfAllSolInd>
      <DiscriminateRaceStdntsRghtsInd>false</DiscriminateRaceStdntsRghtsInd>
      <DiscriminateRaceAdmissPlcyInd>false</DiscriminateRaceAdmissPlcyInd>
      <DiscriminateRaceEmplmFcultyInd>false</DiscriminateRaceEmplmFcultyInd>
      <DiscriminateRaceSchsInd>false</DiscriminateRaceSchsInd>
      <DiscriminateRaceEducPlcyInd>false</DiscriminateRaceEducPlcyInd>
      <DiscriminateRaceUseOfFcltsInd>false</DiscriminateRaceUseOfFcltsInd>
      <DiscriminateRaceAthltProgInd>false</DiscriminateRaceAthltProgInd>
      <DiscriminateRaceOtherActyInd>false</DiscriminateRaceOtherActyInd>
      <GovernmentFinancialAidRcvdInd>false</GovernmentFinancialAidRcvdInd>
      <GovernmentFinancialAidRvkdInd>false</GovernmentFinancialAidRvkdInd>
      <ComplianceWithRevProc7550Ind>true</ComplianceWithRevProc7550Ind>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Line 3</FormAndLineReferenceDesc>
        <ExplanationTxt>PUBLISHED ANNUALLY IN LOCAL NEWSPAPERS IN AN ADVERTISEMENT PUBLISHED BY THE ASSOCIATION OF INDEPENDENT SCHOOLS OF GREATER WASHINGTON. PUBLISHED ANNUALLY IN LOCAL NEWSPAPERS IN AN ADVERTISEMENT PUBLISHED BY THE ASSOCIATION OF INDEPENDENT SCHOOLS OF GREATER WASHINGTON.</ExplanationTxt>
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        <Event1Nm>GALA</Event1Nm>
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        <CharitableContriEvent1Amt>573979</CharitableContriEvent1Amt>
        <GrossRevenueEvent1Amt>92400</GrossRevenueEvent1Amt>
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        <GrossReceiptsTotalAmt>666379</GrossReceiptsTotalAmt>
        <CharitableContributionsTotAmt>573979</CharitableContributionsTotAmt>
        <GrossRevenueTotalEventsAmt>92400</GrossRevenueTotalEventsAmt>
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        <DirectExpenseSummaryEventsAmt>294601</DirectExpenseSummaryEventsAmt>
        <NetIncomeSummaryAmt>-202201</NetIncomeSummaryAmt>
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      <SupplementalNonqualRtrPlanInd>false</SupplementalNonqualRtrPlanInd>
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      <CompBasedOnRevenueOfFlngOrgInd>false</CompBasedOnRevenueOfFlngOrgInd>
      <CompBsdOnRevRelatedOrgsInd>false</CompBsdOnRevRelatedOrgsInd>
      <CompBsdNetEarnsFlngOrgInd>false</CompBsdNetEarnsFlngOrgInd>
      <CompBsdNetEarnsRltdOrgsInd>false</CompBsdNetEarnsRltdOrgsInd>
      <AnyNonFixedPaymentsInd>false</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>false</InitialContractExceptionInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>KATHERINE SCHANTZ</PersonNm>
        <BaseCompensationFilingOrgAmt>409916</BaseCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>13500</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>9540</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>432956</TotalCompensationFilingOrgAmt>
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        <PersonNm>LAURELLE SHEEDY MCCREADY</PersonNm>
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        <NontaxableBenefitsFilingOrgAmt>5243</NontaxableBenefitsFilingOrgAmt>
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        <PersonNm>DIANA MELTZER</PersonNm>
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        <NontaxableBenefitsFilingOrgAmt>9540</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>172389</TotalCompensationFilingOrgAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MARTHA CATHCART</PersonNm>
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        <TotalCompensationFilingOrgAmt>157085</TotalCompensationFilingOrgAmt>
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        <BondReferenceCd>A</BondReferenceCd>
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        </IssuerName>
        <BondIssuerEIN>536001131</BondIssuerEIN>
        <CUSIPNum>NONE00000</CUSIPNum>
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        <OnBehalfOfIssuerInd>false</OnBehalfOfIssuerInd>
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        <CapitalExpendituresAmt>17000259</CapitalExpendituresAmt>
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        <CurrentRefundingInd>false</CurrentRefundingInd>
        <AdvanceRefundingInd>false</AdvanceRefundingInd>
        <FinalAllocationMadeInd>false</FinalAllocationMadeInd>
        <AdequateBooksAndRecMaintInd>true</AdequateBooksAndRecMaintInd>
      </TaxExemptBondsProceedsGrp>
      <TaxExemptBondsPrivateBusUseGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <OwningBondFinancedPropertyInd>false</OwningBondFinancedPropertyInd>
        <AnyLeaseArrangementsInd>false</AnyLeaseArrangementsInd>
        <MgmtContractBondFincdPropInd>false</MgmtContractBondFincdPropInd>
        <AnyResearchAgreementsInd>false</AnyResearchAgreementsInd>
        <PrivateBusUseByOthersPct>0.00000</PrivateBusUseByOthersPct>
        <PrivateBusConcerningUBIPct>0.00000</PrivateBusConcerningUBIPct>
        <TotalPrivateBusinessUsePct>0.00000</TotalPrivateBusinessUsePct>
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      <TaxExemptBondsArbitrageGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <Form8038TFiledInd>true</Form8038TFiledInd>
        <VariableRateIssueInd>false</VariableRateIssueInd>
        <HedgeIdentifiedInBksAndRecInd>false</HedgeIdentifiedInBksAndRecInd>
        <GrossProceedsInvestedInGICInd>false</GrossProceedsInvestedInGICInd>
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        <ProceduresCorrectiveActionInd>true</ProceduresCorrectiveActionInd>
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        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>6</ContributionCnt>
        <NoncashContributionsRptF990Amt>61685</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FMV AT DATE OF DONATION</MethodOfDeterminingRevenuesTxt>
      </SecuritiesPubliclyTradedGrp>
      <AnyPropertyThatMustBeHeldInd>false</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>true</ReviewProcessUnusualNCGiftsInd>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>THE AUDITED FINANCIAL STATEMENTS WERE PRESENTED TO THE AUDIT COMMITTEE OF THE BOARD BY THE INDEPENDENT OUTSIDE AUDITORS. THE MATERIALS WERE REVIEWED IN DETAIL AND THEN PRESENTED BY THE AUDIT CHAIR TO BOTH THE FINANCE COMMITTEE AND DIRECTLY TO THE BOARD OF TRUSTEES WHO ACCEPTED THE REPORT. THE FINALIZED 990 WAS POSTED TO THE BOARD PORTAL PRIOR TO BEING FILED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>ANNUALLY, THE SCHOOL'S AUDIT COMMITTEE REVIEWS THE DISCLOSURES IN ORDER TO DETERMINE WHETHER A CONFLICT OF INTEREST EXISTS AND WHETHER OR NOT SUCH A CONFLICT MATERIALLY AND ADVERSELY AFFECTS THE INTERESTS OF THE SCHOOL. THE INDIVIDUAL WITH THE CONFLICT MAY NOT PARTICIPATE IN SUCH DETERMINATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 15a</FormAndLineReferenceDesc>
        <ExplanationTxt>AT LEAST EVERY TWO YEARS, THE LAB SCHOOL OF WASHINGTON COMPARES SALARIES OF TEACHERS AND ADMINISTRATORS TO CORRESPONDING ROLES IN COMPARABLE INDEPENDENT SCHOOLS IN THE REGION, AND COMPARABLE SPECIAL NEEDS SCHOOLS NATIONALLY. IT IS THE GOAL OF THE SCHOOL TO REACH THE MEDIAN OF COMPARABLE SCHOOLS ALTHOUGH THAT HAS NOT BEEN ACHIEVED YET.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 15b</FormAndLineReferenceDesc>
        <ExplanationTxt>AT LEAST EVERY TWO YEARS, THE LAB SCHOOL OF WASHINGTON COMPARES SALARIES OF TEACHERS AND ADMINISTRATORS TO CORRESPONDING ROLES IN COMPARABLE INDEPENDENT SCHOOLS IN THE REGION, AND COMPARABLE SPECIAL NEEDS SCHOOLS NATIONALLY. IT IS THE GOAL OF THE SCHOOL TO REACH THE MEDIAN OF COMPARABLE SCHOOLS ALTHOUGH THAT HAS NOT BEEN ACHIEVED YET.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Pt VI, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SCHOOL FOLLOWS THE PUBLIC VIEWING POLICY REQUIRED UNDER THE FREEDOM OF INFORMATION ACT. IN ADDITION, ALL POLICIES LISTED IN PART VI, LINE 19 ARE AVAILABLE FOR PUBLIC VIEWING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part III, Line 4d</FormAndLineReferenceDesc>
        <ExplanationTxt>VARIOUS SCHOOL ACTIVITIES 0. 0. 29508.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e</FormAndLineReferenceDesc>
        <ExplanationTxt>DUES &amp; SUBSCRIPTIONS 44961. 30205. 14756. 0.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e</FormAndLineReferenceDesc>
        <ExplanationTxt>MISCELLANEOUS 113382. 55802. 34656. 22924.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e</FormAndLineReferenceDesc>
        <ExplanationTxt>RECRUITING 43420. 18545. 24875. 0.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e</FormAndLineReferenceDesc>
        <ExplanationTxt>SPECIAL EVENT EXPENSES -294601. 0. 0. -294601.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e</FormAndLineReferenceDesc>
        <ExplanationTxt>RENTAL EXPENSES -389956. 0. -389956. 0.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24e</FormAndLineReferenceDesc>
        <ExplanationTxt>BAD DEBT EXPENSE -2434. 0. -2434. 0.</ExplanationTxt>
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