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        <PersonNm>HOLLY SPEYER LIPTON</PersonNm>
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        <PersonNm>BRUCE MENIN</PersonNm>
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        <PersonNm>VALERIE RUBSAMEN</PersonNm>
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        <PersonNm>ZACH SCHREIBER</PersonNm>
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        <PersonNm>JACKIE SIEGAL</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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        <PersonNm>JONATHAN SOBEL</PersonNm>
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        <PersonNm>STEVEN STEINMAN</PersonNm>
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        <PersonNm>ROY SWAN</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>CARLA VAN DE WALLE</PersonNm>
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        <PersonNm>BARRI WALTCHER</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>JIM ZELTER</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>ELLEN STEIN</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>EDWARD PINGER</PersonNm>
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        <PersonNm>JAMES BEST</PersonNm>
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        <PersonNm>LISA WALLER</PersonNm>
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        <PersonNm>ALAN SCHEFEN</PersonNm>
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        <PersonNm>ELIZABETH KRENTS</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>JOHN NEIERS</PersonNm>
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            <State>NY</State>
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      <ProgramServiceRevenueGrp>
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        <TotalRevenueColumnAmt>143016</TotalRevenueColumnAmt>
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        <OtherAmt>85400</OtherAmt>
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        <ExclusionAmt>1132840</ExclusionAmt>
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        <TotalRevenueColumnAmt>0</TotalRevenueColumnAmt>
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      <NetIncomeFromGamingGrp>
        <TotalRevenueColumnAmt>0</TotalRevenueColumnAmt>
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        <BusinessCd>611710</BusinessCd>
        <TotalRevenueColumnAmt>47000</TotalRevenueColumnAmt>
        <ExclusionAmt>47000</ExclusionAmt>
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      <OtherRevenueMiscGrp>
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        <BusinessCd>611710</BusinessCd>
        <TotalRevenueColumnAmt>28892</TotalRevenueColumnAmt>
        <ExclusionAmt>28892</ExclusionAmt>
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      <OtherRevenueMiscGrp>
        <Desc>APPLICATION FEES</Desc>
        <BusinessCd>611710</BusinessCd>
        <TotalRevenueColumnAmt>66714</TotalRevenueColumnAmt>
        <ExclusionAmt>66714</ExclusionAmt>
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      <MiscellaneousRevenueGrp>
        <TotalRevenueColumnAmt>210352</TotalRevenueColumnAmt>
        <ExclusionAmt>210352</ExclusionAmt>
      </MiscellaneousRevenueGrp>
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        <FundraisingAmt>65365</FundraisingAmt>
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        <ManagementAndGeneralAmt>104272</ManagementAndGeneralAmt>
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        <ManagementAndGeneralAmt>164056</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>1055139</ProgramServicesAmt>
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        <FundraisingAmt>249267</FundraisingAmt>
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        <ManagementAndGeneralAmt>68143</ManagementAndGeneralAmt>
        <FundraisingAmt>33343</FundraisingAmt>
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        <ProgramServicesAmt>3492501</ProgramServicesAmt>
        <ManagementAndGeneralAmt>267171</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>906919</ProgramServicesAmt>
        <ManagementAndGeneralAmt>25908</ManagementAndGeneralAmt>
        <FundraisingAmt>2315</FundraisingAmt>
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      <ConferencesMeetingsGrp>
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        <ProgramServicesAmt>438069</ProgramServicesAmt>
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        <ManagementAndGeneralAmt>7651</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>3845817</ProgramServicesAmt>
        <ManagementAndGeneralAmt>294200</ManagementAndGeneralAmt>
        <FundraisingAmt>153791</FundraisingAmt>
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        <ManagementAndGeneralAmt>436060</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>1964989</ProgramServicesAmt>
        <FundraisingAmt>15572</FundraisingAmt>
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      <OtherExpensesGrp>
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        <ManagementAndGeneralAmt>251250</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>466596</ProgramServicesAmt>
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        <ProgramServicesAmt>181832</ProgramServicesAmt>
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        <ProgramServicesAmt>2383108</ProgramServicesAmt>
        <ManagementAndGeneralAmt>485295</ManagementAndGeneralAmt>
        <FundraisingAmt>157697</FundraisingAmt>
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        <ProgramServicesAmt>55963728</ProgramServicesAmt>
        <ManagementAndGeneralAmt>7129897</ManagementAndGeneralAmt>
        <FundraisingAmt>2037245</FundraisingAmt>
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        <EOYAmt>421295</EOYAmt>
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      <LoansFromOfficersDirectorsGrp>
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        <EOYAmt>0</EOYAmt>
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      <TotalLiabilitiesGrp>
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        <EOYAmt>30770912</EOYAmt>
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      <OrganizationFollowsSFAS117Ind>X</OrganizationFollowsSFAS117Ind>
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        <EOYAmt>73371396</EOYAmt>
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        <EOYAmt>16202918</EOYAmt>
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      <PermanentlyRstrNetAssetsGrp>
        <BOYAmt>44297372</BOYAmt>
        <EOYAmt>45541750</EOYAmt>
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        <EOYAmt>135116064</EOYAmt>
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      <TotLiabNetAssetsFundBalanceGrp>
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        <EOYAmt>165886976</EOYAmt>
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      <InfoInScheduleOPartXIInd>X</InfoInScheduleOPartXIInd>
      <ReconcilationRevenueExpnssAmt>-351184</ReconcilationRevenueExpnssAmt>
      <NetUnrlzdGainsLossesInvstAmt>8390233</NetUnrlzdGainsLossesInvstAmt>
      <OtherChangesInNetAssetsAmt>36735</OtherChangesInNetAssetsAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>false</AccountantCompileOrReviewInd>
      <FSAuditedInd>true</FSAuditedInd>
      <FSAuditedBasisGrp>
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      </FSAuditedBasisGrp>
      <AuditCommitteeInd>true</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>false</FederalGrantAuditRequiredInd>
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    <IRS990ScheduleA documentId="IRS990ScheduleA">
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    <IRS990ScheduleB documentId="IRS990ScheduleB">
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        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
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        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
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      <HeldWorksArtGrp />
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        <InvestmentEarningsOrLossesAmt>9996372</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>3592648</OtherExpendituresAmt>
        <EndYearBalanceAmt>83410098</EndYearBalanceAmt>
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        <InvestmentEarningsOrLossesAmt>5789030</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>3079621</OtherExpendituresAmt>
        <EndYearBalanceAmt>75375853</EndYearBalanceAmt>
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      <CYMinus2YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>58275489</BeginningYearBalanceAmt>
        <ContributionsAmt>7909893</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>-564465</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>2749164</OtherExpendituresAmt>
        <EndYearBalanceAmt>62871753</EndYearBalanceAmt>
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        <EndYearBalanceAmt>58275489</EndYearBalanceAmt>
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        <EndYearBalanceAmt>52343649</EndYearBalanceAmt>
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      <PrmnntEndowmentBalanceEOYPct>0.54600</PrmnntEndowmentBalanceEOYPct>
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      <EndowmentsHeldRelatedOrgInd>false</EndowmentsHeldRelatedOrgInd>
      <LandGrp>
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      <BuildingsGrp>
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        <DepreciationAmt>40424155</DepreciationAmt>
        <BookValueAmt>39550354</BookValueAmt>
      </BuildingsGrp>
      <LeaseholdImprovementsGrp />
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        <BookValueAmt>1378381</BookValueAmt>
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      <OtherLandBuildingsGrp>
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        <DepreciationAmt>1460374</DepreciationAmt>
        <BookValueAmt>3533502</BookValueAmt>
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      <TotalBookValueLandBuildingsAmt>44462237</TotalBookValueLandBuildingsAmt>
      <FinancialDerivativesGrp />
      <CloselyHeldEquityInterestsGrp />
      <OtherSecuritiesGrp>
        <Desc>LIMITED PARTNERSHIPS</Desc>
        <BookValueAmt>53600083</BookValueAmt>
        <MethodValuationCd>F</MethodValuationCd>
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      <TotalBookValueSecuritiesAmt>53600083</TotalBookValueSecuritiesAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>64887819</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>8390233</NetUnrealizedGainsInvstAmt>
      <OtherRevenueAmt>85400</OtherRevenueAmt>
      <RevenueNotReportedAmt>8475633</RevenueNotReportedAmt>
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      <RevenueNotReportedFinclStmtAmt>8367500</RevenueNotReportedFinclStmtAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PARTS XI AND XII - OTHER</FormAndLineReferenceDesc>
        <ExplanationTxt>PART XI, LINE 2D - LOSS ON DISPOSAL OF PROPERTY AND EQUIPMENT PART XI, LINE 4B - SCHOLARSHIPS PART XII - LINE 4B - SCHOLARSHIPS SCHOLARSHIPS NETTED AGAINST REVENUE PER FINANCIAL STATEMENTS AND REPORTED AS PART OF EXPENSES ON THE FORM 990: $8,367,500</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>USE OF ORGANIZATION'S ENDOWMENT FUNDS - PART V, LINE 4</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SCHOOL'S ENDOWMENT CONSISTS OF APPROXIMATELY 94 INDIVIDUAL FUNDS ESTABLISHED FOR A VARIETY OF PURPOSES, CONSISTING OF BOTH BOARD DESIGNATED AND DONOR-RESTRICTED ENDOWMENT FUNDS. THE PURPOSE OF ALL THESE FUNDS INCLUDE SCHOLARSHIPS AND STUDENT SUPPORT, FACULTY SUPPORT, AS WELL AS FACILITY UPGRADE AND MAINTENANCE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>INCOME TAXES PART X LINE 2</FormAndLineReferenceDesc>
        <ExplanationTxt>The School is subject to the provisions of the Financial Accounting Standards Board's (the "FASB") Accounting Standards Codification ("ASC") Topic 740-10-05 relating to accounting and reporting for uncertainty in income taxes. Because of the School's general tax-exempt status, ASC Topic 740-10-05 has not had, and is not expected to have, a material impact on the School's financial statements. The annual compliance filings of the School are subject to examination by the Internal Revenue Service ("IRS"), as well as by other various state and local authorities, generally for three years after they are submitted.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>CHANGE IN POST-RETIREMENT LIABILITY - PART X1 LINE 8</FormAndLineReferenceDesc>
        <ExplanationTxt>CHANGE IN POST-RETIREMENT LIABILITY ($36,735)</ExplanationTxt>
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    </IRS990ScheduleD>
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      <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>true</GovernmentFinancialAidRcvdInd>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE E QUESTION 3</FormAndLineReferenceDesc>
        <ExplanationTxt>NEWSPAPER ADVERTISEMENTS AND SCHOOL PUBLICATIONS WHICH MAY BE INSPECTED AT THE SCHOOL'S PREMISES.</ExplanationTxt>
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      <InterestInForeignTrustInd>false</InterestInForeignTrustInd>
      <ForeignCorpOwnershipInd>false</ForeignCorpOwnershipInd>
      <PassiveForeignInvestmestCoInd>true</PassiveForeignInvestmestCoInd>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART IV QUESTION 4 AND 5</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SCHOOL IS NOT REQUIRED TO FILE FORMS 926 AND 8621 AS THE SCHOOLS ACTIVITIES DID NOT MEET THE REPORTING REQUIREMENTS.</ExplanationTxt>
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        <FormAndLineReferenceDesc>SCHEDULE I, PART IV</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FINANCIAL AID COMMITTEE REVIEWS ALL APPLICATIONS FOR FINANCIAL AID. AFTER REVIEW OF APPLICATIONS, THE COMMITTEE DETERMINES THE AMOUNT OF AID THAT IS APPROPRIATE. THE COMMITTEE IS MADE UP OF SENIOR MANAGEMENT AND STAFF SUPPORT. ALL GRANTS OR FINANICAL AID ARE AUTOMATICALLY APPLIED TO TUITION.</ExplanationTxt>
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        <PersonNm>JAMES BEST</PersonNm>
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        <PersonNm>EDWARD PINGER</PersonNm>
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        <PersonNm>LISA WALLER</PersonNm>
        <TitleTxt>DIRECTOR OF HIGH SCHOOL</TitleTxt>
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        <TotalCompensationFilingOrgAmt>333971</TotalCompensationFilingOrgAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>EDWARD FRISCHLING</PersonNm>
        <TitleTxt>ATHLETIC AND CAMP DIRECTOR</TitleTxt>
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        <TotalCompensationFilingOrgAmt>314915</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
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        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>ALAN SCHEFEN</PersonNm>
        <TitleTxt>CONTROLLER</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
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        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>ELIZABETH KRENTS</PersonNm>
        <TitleTxt>ADMISSIONS DIRECTOR</TitleTxt>
        <BaseCompensationFilingOrgAmt>211294</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
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      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>JOHN NEIERS</PersonNm>
        <TitleTxt>DIRECTOR OF TECHNOLOGY</TitleTxt>
        <BaseCompensationFilingOrgAmt>209830</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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        <TotalCompensationFilingOrgAmt>253165</TotalCompensationFilingOrgAmt>
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        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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    </IRS990ScheduleJ>
    <IRS990ScheduleM documentId="IRS990ScheduleM">
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      <ArtHistoricalTreasuresGrp />
      <ArtFractionalInterestGrp />
      <BooksAndPublicationsGrp />
      <ClothingAndHouseholdGoodsGrp />
      <CarsAndOtherVehiclesGrp />
      <BoatsAndPlanesGrp />
      <IntellectualPropertyGrp />
      <SecuritiesPubliclyTradedGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>58</ContributionCnt>
        <NoncashContributionsRptF990Amt>594000</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FMV</MethodOfDeterminingRevenuesTxt>
      </SecuritiesPubliclyTradedGrp>
      <SecuritiesCloselyHeldStockGrp />
      <SecurPrtnrshpTrustIntrstsGrp />
      <SecuritiesMiscellaneousGrp />
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      <QualifiedContribOtherGrp />
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      <RealEstateCommercialGrp />
      <RealEstateOtherGrp />
      <CollectiblesGrp />
      <FoodInventoryGrp />
      <DrugsAndMedicalSuppliesGrp />
      <TaxidermyGrp />
      <HistoricalArtifactsGrp />
      <ScientificSpecimensGrp />
      <ArchaeologicalArtifactsGrp />
      <AnyPropertyThatMustBeHeldInd>false</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>true</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>false</ThirdPartiesUsedInd>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="IRS990ScheduleO">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTIONS A, B, AND C</FormAndLineReferenceDesc>
        <ExplanationTxt>PART VI, SECTION A, LINE 10 THE ORGANIZATION'S FORM 990 IS FIRST REVIEWED BY THE CHIEF FINANCIAL OFFICER, THE AUDIT COMMITTEE, AND THE EXECUTIVE COMMITTEE OF THE BOARD AND THEN PRESENTED TO THE FULL BOARD BEFORE FILING. PART VI, SECTION B, LN 12C ALL BOARD MEMBERS ARE ASKED TO COMPLETE A FORMAL CONFLICT OF INTEREST FORM/QUESTIONNAIRE. THIS IS DONE ONCE A YEAR. THE FORMS ARE KEPT BY THE HEAD OF SCHOOL. THE HEAD OF SCHOOL AND THE COMPLETE BOARD REVIEW THE FORMS. PART VI, SECTION B, LINES 15A AND 15B COMPENSATION OF OFFICERS AND KEY EMPLOYEES WERE REVIEWED BY THE BOARD USING COMPARABLE DATA FROM CERTAIN OUTSIDE ORGANIZATIONS. PART VI, SECTION C, LINE 19 FORM 990 AND THE FINANCIAL STATEMENTS ARE AVAILABLE AT THE OFFICES OF THE DALTON SCHOOL UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART IX LINE 24B</FormAndLineReferenceDesc>
        <ExplanationTxt>DEBORAH BINGHAM AND WILLIAM FISHER ARE FACULTY REPRESENTATIVES ON THE SCHOOLS BOARD OF TRUSTEES. AS SUCH, THEY ARE ENTITLED TO SHARE A SINGLE VOTE ON THE BOARD WITH RESPECT TO MATTERS BROUGHT BEFORE THE TRUSTEES WHICH REQUIRE RATIFICATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 5 - RECONCILIATION OF NET ASSETS</FormAndLineReferenceDesc>
        <ExplanationTxt>UNCOLLECTIBLE PLEDGES AMOUNTING TO $251,250 REPRESENTS A CHARGE AGAINST A RESERVE AND IS NOT REFLECTIVE OF A CHARGE AGAINST ANY SPECIFIC DONATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990 PART XI, LINE 9</FormAndLineReferenceDesc>
        <ExplanationTxt>OTHER CHANGES IN NET ASSETS REPRESENTS THE CHANGE IN THE POST-RETIREMENT BENEFIT LIABILITY OF $36,735.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>