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      <ExcessOrDeficitForYear>-835155</ExcessOrDeficitForYear>
      <NetUnrealizedGLOnInvestments>-173832</NetUnrealizedGLOnInvestments>
      <DonatedServicesAndFacilities>4861</DonatedServicesAndFacilities>
      <InvestmentExpenses>0</InvestmentExpenses>
      <PriorPeriodAdjustments>0</PriorPeriodAdjustments>
      <OtherAmount>0</OtherAmount>
      <TotalAdjustments>-168971</TotalAdjustments>
      <ExcessOrDeficitPerFS>-1004126</ExcessOrDeficitPerFS>
      <TotRevenueEtcAuditedFinclStmt>24377214</TotRevenueEtcAuditedFinclStmt>
      <NetUnrealizedGainsInvestments>-173832</NetUnrealizedGainsInvestments>
      <DonatedSrvcAndUseOfFacilities>4861</DonatedSrvcAndUseOfFacilities>
      <RecoveriesOfPriorYearGrants>0</RecoveriesOfPriorYearGrants>
      <OtherRevenues>-206074</OtherRevenues>
      <RevenueNotRptdF990>-375045</RevenueNotRptdF990>
      <RevenueSubtotal>24752259</RevenueSubtotal>
      <InvestmentExpensesNotIncluded>0</InvestmentExpensesNotIncluded>
      <OtherRevenuesNotIncluded>-644251</OtherRevenuesNotIncluded>
      <RevenueNotRptdOnFinStmt>-644251</RevenueNotRptdOnFinStmt>
      <TotalRevenuePerForm990>24108008</TotalRevenuePerForm990>
      <TotExpensesEtcAuditedFinclStmt>25386201</TotExpensesEtcAuditedFinclStmt>
      <DonatedServicesUseOfFacilities>4861</DonatedServicesUseOfFacilities>
      <PriorYearAdjustments>0</PriorYearAdjustments>
      <LossesReported>0</LossesReported>
      <OtherExpensesIncluded>644251</OtherExpensesIncluded>
      <ExpensesNotRptdF990>649112</ExpensesNotRptdF990>
      <ExpensesSubtotal>24737089</ExpensesSubtotal>
      <InvestmentExpensesNotIncluded2>0</InvestmentExpensesNotIncluded2>
      <OtherExpensesNotIncluded>206074</OtherExpensesNotIncluded>
      <ExpensesNotRptdOnFinStmt>206074</ExpensesNotRptdOnFinStmt>
      <TotalExpensesPerForm990>24943163</TotalExpensesPerForm990>
      <Form990ScheduleDPartXIV>
        <Identifier>SchD_P02_S00_L09</Identifier>
        <ReturnReference>Schedule D, Part II, Line 9</ReturnReference>
        <Explanation>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.</Explanation>
      </Form990ScheduleDPartXIV>
      <Form990ScheduleDPartXIV>
        <Identifier>SchD_P05_S00_L04</Identifier>
        <ReturnReference>Schedule D, Part V, Line 4</ReturnReference>
        <Explanation>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.</Explanation>
      </Form990ScheduleDPartXIV>
      <Form990ScheduleDPartXIV>
        <Identifier>SchD_P12_S00_L02d</Identifier>
        <ReturnReference>Schedule D, Part XII, Line 2d</ReturnReference>
        <Explanation>Financial aid</Explanation>
      </Form990ScheduleDPartXIV>
      <Form990ScheduleDPartXIV>
        <Identifier>SchD_P12_S00_L04b</Identifier>
        <ReturnReference>Schedule D, Part XII, Line 4b</ReturnReference>
        <Explanation>Special event expenses $(257,823) and rental expenses $(386,428).</Explanation>
      </Form990ScheduleDPartXIV>
      <Form990ScheduleDPartXIV>
        <Identifier>SchD_P13_S00_L02d</Identifier>
        <ReturnReference>Schedule D, Part XIII, Line 2d</ReturnReference>
        <Explanation>Special event expenses $(257,823) and rental expenses $(386,428).</Explanation>
      </Form990ScheduleDPartXIV>
      <Form990ScheduleDPartXIV>
        <Identifier>SchD_P13_S00_L04b</Identifier>
        <ReturnReference>Schedule D, Part XIII, Line 4b</ReturnReference>
        <Explanation>Financial aid</Explanation>
      </Form990ScheduleDPartXIV>
    </IRS990ScheduleD>
    <IRS990ScheduleE documentId="R000005" softwareId="11000129" softwareVersion="v1.00">
      <NondiscriminatoryPolicyStmt>1</NondiscriminatoryPolicyStmt>
      <PolicyStatementInBrochuresEtc>1</PolicyStatementInBrochuresEtc>
      <PolicyPublViaBroadcastMedia>1</PolicyPublViaBroadcastMedia>
      <MaintRacialCompositionRecords>1</MaintRacialCompositionRecords>
      <MaintScholarshipsRecords>1</MaintScholarshipsRecords>
      <MaintCopiesOfBrochuresEtc>1</MaintCopiesOfBrochuresEtc>
      <MaintCopiesOfAllSolicitations>1</MaintCopiesOfAllSolicitations>
      <DiscriminateRaceStudentsRights>0</DiscriminateRaceStudentsRights>
      <DiscriminateRaceAdmissPolicies>0</DiscriminateRaceAdmissPolicies>
      <DiscriminateRaceEmplmnFaculty>0</DiscriminateRaceEmplmnFaculty>
      <DiscriminateRaceScholarships>0</DiscriminateRaceScholarships>
      <DiscriminateRaceEducPolicies>0</DiscriminateRaceEducPolicies>
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      <DiscriminateRaceAthleticProg>0</DiscriminateRaceAthleticProg>
      <DiscriminateRaceOtherActy>0</DiscriminateRaceOtherActy>
      <GovernmentFinancialAidReceived>0</GovernmentFinancialAidReceived>
      <GovernmentFinancialAidRevoked>0</GovernmentFinancialAidRevoked>
      <ComplianceWithRevProc7550>1</ComplianceWithRevProc7550>
      <Form990ScheduleEPartII>
        <Identifier>SchE_P01_S00_L03</Identifier>
        <ReturnReference>Schedule E, Part I, Line 3</ReturnReference>
        <Explanation>Published annually in local newspapers in an advertisement published by the regional independent school association, Independent Education.</Explanation>
      </Form990ScheduleEPartII>
    </IRS990ScheduleE>
    <IRS990ScheduleG documentId="R000006" softwareId="11000129" softwareVersion="v1.00">
      <MailSolicitations>X</MailSolicitations>
      <EmailSolicitations>X</EmailSolicitations>
      <PhoneSolicitations>X</PhoneSolicitations>
      <InPersonSolicitations>X</InPersonSolicitations>
      <SolicitationOfNonGovtGrants>X</SolicitationOfNonGovtGrants>
      <SolicitationOfGovtGrants>X</SolicitationOfGovtGrants>
      <SpecialFundraisingEvents>X</SpecialFundraisingEvents>
      <AgreementRefFundraising>1</AgreementRefFundraising>
      <FundraiserActivityInformation>
        <NameOfOrganization>
          <BusinessNameLine1>Infograte Incorporated</BusinessNameLine1>
        </NameOfOrganization>
        <AddressUS>
          <AddressLine1>PO Box 559</AddressLine1>
          <City>Glen Echo</City>
          <State>MD</State>
          <ZIPCode>20812</ZIPCode>
        </AddressUS>
        <Activity>They advise, coordinate and assist in the annual giving campaign and the training of volunteers.</Activity>
        <FundraiserControlOfFunds>0</FundraiserControlOfFunds>
        <GrossReceipts>0</GrossReceipts>
        <AmountRetainedByContractor>5500</AmountRetainedByContractor>
        <NetToOrganization>-5500</NetToOrganization>
      </FundraiserActivityInformation>
      <FundraiserActivityInformation>
        <NameOfOrganization>
          <BusinessNameLine1>Florain Solutions</BusinessNameLine1>
        </NameOfOrganization>
        <AddressUS>
          <AddressLine1>3924 Benton Street NW</AddressLine1>
          <City>Washington</City>
          <State>DC</State>
          <ZIPCode>20007</ZIPCode>
        </AddressUS>
        <Activity>They provide professional fundraising for the Lab School of Washington, including grant writing.</Activity>
        <FundraiserControlOfFunds>0</FundraiserControlOfFunds>
        <GrossReceipts>214399</GrossReceipts>
        <AmountRetainedByContractor>12757</AmountRetainedByContractor>
        <NetToOrganization>201642</NetToOrganization>
      </FundraiserActivityInformation>
      <TotalGrossReceipts>214399</TotalGrossReceipts>
      <TotalRetainedByContractors>18257</TotalRetainedByContractors>
      <TotalNetToOrganization>196142</TotalNetToOrganization>
      <LicensedStates>DC</LicensedStates>
      <LicensedStates>MD</LicensedStates>
      <EventsInformation>
        <NameOfEvent1>Gala</NameOfEvent1>
        <GrossReceiptsEvent1>931482</GrossReceiptsEvent1>
        <CharitableContributionsEvent1>673659</CharitableContributionsEvent1>
        <GrossRevenueEvent1>257823</GrossRevenueEvent1>
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        <FoodAndBeverageEvent1>0</FoodAndBeverageEvent1>
        <EntertainmentEvent1>0</EntertainmentEvent1>
        <OtherDirectExpensesEvent1>257823</OtherDirectExpensesEvent1>
        <FoodAndBeverageOtherEvents>0</FoodAndBeverageOtherEvents>
        <EntertainmentOtherEvents>0</EntertainmentOtherEvents>
        <GrossReceiptsTotal>931482</GrossReceiptsTotal>
        <CharitableContributionsTotal>673659</CharitableContributionsTotal>
        <GrossRevenueTotalEvents>257823</GrossRevenueTotalEvents>
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        <EntertainmentTotalEvents>0</EntertainmentTotalEvents>
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        <DirectExpenseSummaryEvents>257823</DirectExpenseSummaryEvents>
        <NetIncomeSummary>0</NetIncomeSummary>
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    <IRS990ScheduleI documentId="R000007" softwareId="11000129" softwareVersion="v1.00">
      <RecordsMaintained>1</RecordsMaintained>
      <Form990ScheduleIPartIII>
        <TypeOfGrant>Financial aid grants</TypeOfGrant>
        <NumberOfRecipients>21</NumberOfRecipients>
        <AmountOfCashGrant>0</AmountOfCashGrant>
        <AmountOfNonCashAssistance>186788</AmountOfNonCashAssistance>
        <MethodOfValuation>FMV</MethodOfValuation>
        <DescriptionOfNonCashAssistance>Tuition reduction</DescriptionOfNonCashAssistance>
      </Form990ScheduleIPartIII>
      <Form990ScheduleIPartIII>
        <TypeOfGrant>Summer school financial aid grants</TypeOfGrant>
        <NumberOfRecipients>18</NumberOfRecipients>
        <AmountOfCashGrant>0</AmountOfCashGrant>
        <AmountOfNonCashAssistance>19285</AmountOfNonCashAssistance>
        <MethodOfValuation>FMV</MethodOfValuation>
        <DescriptionOfNonCashAssistance>Tuition reduction</DescriptionOfNonCashAssistance>
      </Form990ScheduleIPartIII>
      <Form990ScheduleIPartIV>
        <Identifier>SchI_P01_S00_L02</Identifier>
        <ReturnReference>Schedule I, Part I, Line 2</ReturnReference>
        <Explanation>The Lab School of Washington requires all applicants for financial aid to apply through the FAST system (Financial Aid for School Tuition, a product of Independent School Management). FAST gathers the family financial data and recommends a financial aid award. The School Financial Aid Committee uses that input, considers the needs of the School and any family special circumstances to determine the award offer. The School tries to help as many eligible families as possible, although the School's resources for financial aid are far fewer than the need.</Explanation>
      </Form990ScheduleIPartIV>
    </IRS990ScheduleI>
    <IRS990ScheduleJ documentId="R000008" softwareId="11000129" softwareVersion="v1.00">
      <SeverancePayment>0</SeverancePayment>
      <SupplementalNonqualRetirePlan>0</SupplementalNonqualRetirePlan>
      <EquityBasedCompArrangement>0</EquityBasedCompArrangement>
      <CompBasedOnRevenueOfFilingOrg>1</CompBasedOnRevenueOfFilingOrg>
      <CompBasedOnRevenueRelatedOrgs>0</CompBasedOnRevenueRelatedOrgs>
      <CompBasedNetEarningsFilingOrg>0</CompBasedNetEarningsFilingOrg>
      <CompBasedNetEarningsRelateOrgs>0</CompBasedNetEarningsRelateOrgs>
      <AnyNonFixedPayments>0</AnyNonFixedPayments>
      <InitialContractException>0</InitialContractException>
      <Form990ScheduleJPartII>
        <NamePerson>Katherine Schantz</NamePerson>
        <BaseCompensationFilingOrg>275430</BaseCompensationFilingOrg>
        <CompBasedOnRelatedOrgs>0</CompBasedOnRelatedOrgs>
        <BonusFilingOrg>0</BonusFilingOrg>
        <BonusRelatedOrgs>0</BonusRelatedOrgs>
        <OtherCompensationFilingOrg>0</OtherCompensationFilingOrg>
        <OtherCompensationRelatedOrgs>0</OtherCompensationRelatedOrgs>
        <DeferredCompFilingOrg>14608</DeferredCompFilingOrg>
        <DeferredCompRelatedOrgs>0</DeferredCompRelatedOrgs>
        <NontaxableBenefitsFilingOrg>7856</NontaxableBenefitsFilingOrg>
        <NontaxableBenefitsRelatedOrgs>0</NontaxableBenefitsRelatedOrgs>
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        <TotalCompensationRelatedOrgs>0</TotalCompensationRelatedOrgs>
        <CompReportPrior990FilingOrg>0</CompReportPrior990FilingOrg>
        <CompReportPrior990RelatedOrgs>0</CompReportPrior990RelatedOrgs>
      </Form990ScheduleJPartII>
      <Form990ScheduleJPartIII>
        <Identifier>SchJ_P01_S00_L05</Identifier>
        <ReturnReference>Schedule J, Part I, Line 5</ReturnReference>
        <Explanation>Speech specialist receives a percentage of the revenue for the services provided for outpatients.</Explanation>
      </Form990ScheduleJPartIII>
    </IRS990ScheduleJ>
    <IRS990ScheduleM documentId="R000009" softwareId="11000129" softwareVersion="v1.00">
      <SecuritiesPubliclyTraded>
        <NonCashCheckbox>X</NonCashCheckbox>
        <NumberOfContributions>9</NumberOfContributions>
        <NoncashContribsRptdF990>101590</NoncashContribsRptdF990>
        <MethodOfDeterminingRevenues>FMV</MethodOfDeterminingRevenues>
      </SecuritiesPubliclyTraded>
      <OtherNonCashContributionsTable>
        <NonCashCheckbox>X</NonCashCheckbox>
        <Description>Equipment and supplies</Description>
        <NumberOfContributions>6</NumberOfContributions>
        <NoncashContribsRptdF990>40043</NoncashContribsRptdF990>
        <MethodOfDeterminingRevenues>FMV</MethodOfDeterminingRevenues>
      </OtherNonCashContributionsTable>
      <AnyPropertyThatMustBeHeld>0</AnyPropertyThatMustBeHeld>
      <ReviewProcessUnusualNCGifts>1</ReviewProcessUnusualNCGifts>
      <ThirdPartiesUsed>1</ThirdPartiesUsed>
      <Form990ScheduleMPartII>
        <Identifier>SchM_P01_S00_L32b</Identifier>
        <ReturnReference>Schedule M, Part I, Line 32b</ReturnReference>
        <Explanation>The Organization hires a consultant to manage the grant plan for funders including corporate and foundation giving and to write grant proposals for new corporate and foundation funding opportunities.</Explanation>
      </Form990ScheduleMPartII>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="R000010" softwareId="11000129" softwareVersion="v1.00">
      <GeneralExplanation>
        <Identifier>F990_P06_S0A_L04</Identifier>
        <ReturnReference>Form 990, Part VI, Section A, Line 4</ReturnReference>
        <Explanation>The Lab School of Washington will mail the changes in separately.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>F990_P06_S0A_L07a</Identifier>
        <ReturnReference>Form 990, Part VI, Section A, Line 7a</ReturnReference>
        <Explanation>The nominating committee recommends candidates for election to the full Board.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>F990_P06_S0B_L11b</Identifier>
        <ReturnReference>Form 990, Part VI, Section B, Line 11b</ReturnReference>
        <Explanation>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.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>F990_P06_S0B_L15</Identifier>
        <ReturnReference>Form 990, Part VI, Section B, Line 15</ReturnReference>
        <Explanation>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.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>F990_P06_S0C_L19</Identifier>
        <ReturnReference>Form 990, Part VI, Section C, Line 19</ReturnReference>
        <Explanation>The Lab School of Washington follows the public viewing policy required under the Freedom of Information Act. In addition, all policies listed in Part VI, Line 18 are available for public viewing.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>F990_P11_S00_L05</Identifier>
        <ReturnReference>Form 990, Part XI, Line 5</ReturnReference>
        <Explanation>Unrealized loss on investments $173,832.</Explanation>
      </GeneralExplanation>
    </IRS990ScheduleO>
  </ReturnData>
</Return>