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        <ExclusionAmt>2731</ExclusionAmt>
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      <GrantsToDomesticIndividualsGrp>
        <TotalAmt>1473936</TotalAmt>
        <ProgramServicesAmt>1473936</ProgramServicesAmt>
      </GrantsToDomesticIndividualsGrp>
      <CompCurrentOfcrDirectorsGrp>
        <TotalAmt>207638</TotalAmt>
        <ProgramServicesAmt>51909</ProgramServicesAmt>
        <ManagementAndGeneralAmt>155729</ManagementAndGeneralAmt>
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      <OtherSalariesAndWagesGrp>
        <TotalAmt>2921698</TotalAmt>
        <ProgramServicesAmt>2577158</ProgramServicesAmt>
        <ManagementAndGeneralAmt>320196</ManagementAndGeneralAmt>
        <FundraisingAmt>24344</FundraisingAmt>
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      <OtherEmployeeBenefitsGrp>
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        <ProgramServicesAmt>207501</ProgramServicesAmt>
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      <FeesForServicesAccountingGrp>
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        <ManagementAndGeneralAmt>19200</ManagementAndGeneralAmt>
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      <FeesForServicesOtherGrp>
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        <ProgramServicesAmt>215133</ProgramServicesAmt>
        <ManagementAndGeneralAmt>32224</ManagementAndGeneralAmt>
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      <AdvertisingGrp>
        <TotalAmt>54369</TotalAmt>
        <ProgramServicesAmt>53067</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1302</ManagementAndGeneralAmt>
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      <OfficeExpensesGrp>
        <TotalAmt>19458</TotalAmt>
        <ManagementAndGeneralAmt>19458</ManagementAndGeneralAmt>
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      <OccupancyGrp>
        <TotalAmt>151683</TotalAmt>
        <ProgramServicesAmt>145176</ProgramServicesAmt>
        <ManagementAndGeneralAmt>6507</ManagementAndGeneralAmt>
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      <TravelGrp>
        <TotalAmt>56855</TotalAmt>
        <ProgramServicesAmt>56855</ProgramServicesAmt>
      </TravelGrp>
      <ConferencesMeetingsGrp>
        <TotalAmt>16419</TotalAmt>
        <ProgramServicesAmt>16419</ProgramServicesAmt>
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      <InterestGrp>
        <TotalAmt>239681</TotalAmt>
        <ManagementAndGeneralAmt>239681</ManagementAndGeneralAmt>
      </InterestGrp>
      <DepreciationDepletionGrp>
        <TotalAmt>542625</TotalAmt>
        <ProgramServicesAmt>271313</ProgramServicesAmt>
        <ManagementAndGeneralAmt>271312</ManagementAndGeneralAmt>
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      <InsuranceGrp>
        <TotalAmt>103053</TotalAmt>
        <ProgramServicesAmt>86578</ProgramServicesAmt>
        <ManagementAndGeneralAmt>15673</ManagementAndGeneralAmt>
        <FundraisingAmt>802</FundraisingAmt>
      </InsuranceGrp>
      <OtherExpensesGrp>
        <Desc>Direct educational expenses</Desc>
        <TotalAmt>211159</TotalAmt>
        <ProgramServicesAmt>211159</ProgramServicesAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>Supplies</Desc>
        <TotalAmt>74648</TotalAmt>
        <ProgramServicesAmt>74648</ProgramServicesAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>Telephone</Desc>
        <TotalAmt>14439</TotalAmt>
        <ProgramServicesAmt>13820</ProgramServicesAmt>
        <ManagementAndGeneralAmt>619</ManagementAndGeneralAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>Maintenance and repairs</Desc>
        <TotalAmt>191972</TotalAmt>
        <ProgramServicesAmt>183736</ProgramServicesAmt>
        <ManagementAndGeneralAmt>8236</ManagementAndGeneralAmt>
      </OtherExpensesGrp>
      <AllOtherExpensesGrp>
        <TotalAmt>43106</TotalAmt>
        <ProgramServicesAmt>30366</ProgramServicesAmt>
        <ManagementAndGeneralAmt>12740</ManagementAndGeneralAmt>
      </AllOtherExpensesGrp>
      <TotalFunctionalExpensesGrp>
        <TotalAmt>7075258</TotalAmt>
        <ProgramServicesAmt>5869547</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1176785</ManagementAndGeneralAmt>
        <FundraisingAmt>28926</FundraisingAmt>
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      <CashNonInterestBearingGrp>
        <BOYAmt>155826</BOYAmt>
        <EOYAmt>276264</EOYAmt>
      </CashNonInterestBearingGrp>
      <SavingsAndTempCashInvstGrp>
        <BOYAmt>1911608</BOYAmt>
        <EOYAmt>1739903</EOYAmt>
      </SavingsAndTempCashInvstGrp>
      <AccountsReceivableGrp>
        <BOYAmt>47648</BOYAmt>
        <EOYAmt>89879</EOYAmt>
      </AccountsReceivableGrp>
      <PrepaidExpensesDefrdChargesGrp>
        <BOYAmt>336635</BOYAmt>
        <EOYAmt>456544</EOYAmt>
      </PrepaidExpensesDefrdChargesGrp>
      <LandBldgEquipCostOrOtherBssAmt>15063358</LandBldgEquipCostOrOtherBssAmt>
      <LandBldgEquipAccumDeprecAmt>9158890</LandBldgEquipAccumDeprecAmt>
      <LandBldgEquipBasisNetGrp>
        <BOYAmt>6197746</BOYAmt>
        <EOYAmt>5904468</EOYAmt>
      </LandBldgEquipBasisNetGrp>
      <InvestmentsPubTradedSecGrp>
        <BOYAmt>66059</BOYAmt>
        <EOYAmt>85298</EOYAmt>
      </InvestmentsPubTradedSecGrp>
      <OtherAssetsTotalGrp>
        <BOYAmt>8095</BOYAmt>
        <EOYAmt>8095</EOYAmt>
      </OtherAssetsTotalGrp>
      <TotalAssetsGrp>
        <BOYAmt>8723617</BOYAmt>
        <EOYAmt>8560451</EOYAmt>
      </TotalAssetsGrp>
      <AccountsPayableAccrExpnssGrp>
        <BOYAmt>92957</BOYAmt>
        <EOYAmt>151277</EOYAmt>
      </AccountsPayableAccrExpnssGrp>
      <DeferredRevenueGrp>
        <BOYAmt>2712311</BOYAmt>
        <EOYAmt>2226896</EOYAmt>
      </DeferredRevenueGrp>
      <MortgNotesPyblScrdInvstPropGrp>
        <BOYAmt>6334478</BOYAmt>
        <EOYAmt>6687400</EOYAmt>
      </MortgNotesPyblScrdInvstPropGrp>
      <OtherLiabilitiesGrp>
        <BOYAmt>972417</BOYAmt>
        <EOYAmt>742982</EOYAmt>
      </OtherLiabilitiesGrp>
      <TotalLiabilitiesGrp>
        <BOYAmt>10112163</BOYAmt>
        <EOYAmt>9808555</EOYAmt>
      </TotalLiabilitiesGrp>
      <OrganizationFollowsFASB117Ind>X</OrganizationFollowsFASB117Ind>
      <NoDonorRestrictionNetAssetsGrp>
        <BOYAmt>-1411046</BOYAmt>
        <EOYAmt>-1280604</EOYAmt>
      </NoDonorRestrictionNetAssetsGrp>
      <DonorRestrictionNetAssetsGrp>
        <BOYAmt>22500</BOYAmt>
        <EOYAmt>32500</EOYAmt>
      </DonorRestrictionNetAssetsGrp>
      <TotalNetAssetsFundBalanceGrp>
        <BOYAmt>-1388546</BOYAmt>
        <EOYAmt>-1248104</EOYAmt>
      </TotalNetAssetsFundBalanceGrp>
      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>8723617</BOYAmt>
        <EOYAmt>8560451</EOYAmt>
      </TotLiabNetAssetsFundBalanceGrp>
      <ReconcilationRevenueExpnssAmt>-426971</ReconcilationRevenueExpnssAmt>
      <NetUnrlzdGainsLossesInvstAmt>567413</NetUnrlzdGainsLossesInvstAmt>
      <OtherChangesInNetAssetsAmt>0</OtherChangesInNetAssetsAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>false</AccountantCompileOrReviewInd>
      <FSAuditedInd>true</FSAuditedInd>
      <FSAuditedBasisGrp>
        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
      </FSAuditedBasisGrp>
      <AuditCommitteeInd>true</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>false</FederalGrantAuditRequiredInd>
    </IRS990>
    <IRS990ScheduleA documentId="990A">
      <SchoolInd>X</SchoolInd>
    </IRS990ScheduleA>
    <IRS990ScheduleB documentId="990B">
      <ContributorInformationGrp>
        <ContributorNum>RESTRICTED</ContributorNum>
        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
        </ContributorUSAddress>
        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
      </ContributorInformationGrp>
    </IRS990ScheduleB>
    <IRS990ScheduleD documentId="990D">
      <ProtectionNaturalHabitatInd>X</ProtectionNaturalHabitatInd>
      <TotalEasementsCnt>1</TotalEasementsCnt>
      <TotalAcreageCnt>6.00</TotalAcreageCnt>
      <HistoricStructureEasementsCnt>1</HistoricStructureEasementsCnt>
      <HistoricStrctrEasementsAftrCnt>1</HistoricStrctrEasementsAftrCnt>
      <StatesEasementsHeldCnt>1</StatesEasementsHeldCnt>
      <WrittenPolicyMonitoringInd>false</WrittenPolicyMonitoringInd>
      <Section170hRqrStsfdInd>true</Section170hRqrStsfdInd>
      <LandGrp>
        <OtherCostOrOtherBasisAmt>445781</OtherCostOrOtherBasisAmt>
        <BookValueAmt>445781</BookValueAmt>
      </LandGrp>
      <BuildingsGrp>
        <OtherCostOrOtherBasisAmt>13573845</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>8364880</DepreciationAmt>
        <BookValueAmt>5208965</BookValueAmt>
      </BuildingsGrp>
      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>1043732</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>794010</DepreciationAmt>
        <BookValueAmt>249722</BookValueAmt>
      </EquipmentGrp>
      <TotalBookValueLandBuildingsAmt>5904468</TotalBookValueLandBuildingsAmt>
      <OtherAssetsOrgGrp>
        <Desc>Security deposits</Desc>
      </OtherAssetsOrgGrp>
      <OtherAssetsOrgGrp>
        <Desc>Cash restricted for escrow deposit</Desc>
        <BookValueAmt>8095</BookValueAmt>
      </OtherAssetsOrgGrp>
      <TotalBookValueOtherAssetsAmt>8095</TotalBookValueOtherAssetsAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>Forgivable loan payable</Desc>
        <Amt>742982</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>742982</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>5741764</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>567413</NetUnrealizedGainsInvstAmt>
      <RevenueNotReportedAmt>567413</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>5174351</RevenueSubtotalAmt>
      <OtherRevenuesNotIncludedAmt>1473936</OtherRevenuesNotIncludedAmt>
      <RevenueNotReportedFinclStmtAmt>1473936</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>6648287</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>5601322</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesSubtotalAmt>5601322</ExpensesSubtotalAmt>
      <OtherExpensesNotIncludedAmt>1473936</OtherExpensesNotIncludedAmt>
      <ExpensesNotRptFinclStmtAmt>1473936</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>7075258</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Reports conservation easements (Part II, line 9)</FormAndLineReferenceDesc>
        <ExplanationTxt>The conservation easement is part of the land that is owned by the Princeton Montessori Society. Therefore, the easement is an asset on the balance sheet.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Other revenues included on Form 990 (Part XI, line 4b)</FormAndLineReferenceDesc>
        <ExplanationTxt>Tuition assistance in the amount of $1,473,936.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Other expenses included on Form 990 (Part XII, line 4b)</FormAndLineReferenceDesc>
        <ExplanationTxt>Tuition assistance in the amount of $1,473,936.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Footnote for uncertain tax position under FIN 48 (Part X)</FormAndLineReferenceDesc>
        <ExplanationTxt>Generally accepted accounting principles prescribe how an organization should measure, recognize, present and disclose in its financial statements tax positions that the organization has taken on its information returns. The Organization regularly reviews its tax positions taken and as reflected in its financial statements, with regard to issues affecting tax matters. The Organization has concluded that no tax benefits or liabilities are required to be recognized in accordance with generally accepted accounting principles.The Organizations tax and information returns are generally subject to examination by taxing authorities for three years, including 2017, 2018, and 2019.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>General Explanation Attachment</FormAndLineReferenceDesc>
        <ExplanationTxt>Part XI, Line 2A (Net Unrealized Gains on Investments) - Unrealized loss on interst rate swap in the amount of $554,011. Unrealized gain on investment in the amount of $13,402.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleE documentId="990E">
      <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>Description of nondiscriminatory policy (Question 3)</FormAndLineReferenceDesc>
        <ExplanationTxt>It is the policy of Organization not to discriminate on the basis of race, color, religion, sex, national origin, age or disability in its educational programs and its related policies and procedures.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleE>
    <IRS990ScheduleG documentId="990G" />
    <IRS990ScheduleI documentId="990I">
      <GrantRecordsMaintainedInd>true</GrantRecordsMaintainedInd>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>Scholarship for students attending PMS Prog</GrantTypeTxt>
        <RecipientCnt>5</RecipientCnt>
        <CashGrantAmt>111985</CashGrantAmt>
        <ValuationMethodUsedDesc>FMV-comparable fees</ValuationMethodUsedDesc>
        <NonCashAssistanceDesc>Tuition scholarships</NonCashAssistanceDesc>
      </GrantsOtherAsstToIndivInUSGrp>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>Tuition assistance for students attending PMS Prog</GrantTypeTxt>
        <CashGrantAmt>1361951</CashGrantAmt>
        <ValuationMethodUsedDesc>FMV-comparable fees</ValuationMethodUsedDesc>
        <NonCashAssistanceDesc>Tuition assistance</NonCashAssistanceDesc>
      </GrantsOtherAsstToIndivInUSGrp>
    </IRS990ScheduleI>
    <IRS990ScheduleO documentId="990O">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990 governing body review Part VI line 11</FormAndLineReferenceDesc>
        <ExplanationTxt>The 990 form and the related schedules are provided to and reviewed by select members of the board as well as management prior to submittal to the respective tax agencies.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Conflict of interest policy compliance Part VI line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>All board members as well as key employees and management are required to immediately disclose any relationship that may potentially give rise to a conflict of interest.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>CEO executive director top management comp Part VI line 15a</FormAndLineReferenceDesc>
        <ExplanationTxt>Compensation for Head of School is discussed and set by the board of directors and is reviewed per annum. Remainder of senior administration is approved through the budget process which is evaluated and reviewed annually.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Other officer or key employee compensation Part VI line 15b</FormAndLineReferenceDesc>
        <ExplanationTxt>All compensation for key personnel is approved through the budget process by the board of directors which is evaluated and reviewed annually.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Governing documents etc available to public Part VI line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>The organization makes available its governing documents, conflict of interest policy and other policies and procedures upon request. The financial statements are also made available upon request. The 990 filing and the related schedules are made available upon request and can also be found on Guidestar.com, which is an independent entity that makes available via their website certain nonprofit information including but not limited to the Form 990.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>General explanation attachment</FormAndLineReferenceDesc>
        <ExplanationTxt>Organizations Mission (Page 1, Part I, Line 1 &amp; Page 2, Part III, Line 1): We strive to promote intrinsic motivation, self-reliance, social responsibility, and a love of learning so that as global citizens, our students can lead fulfilling lives and work to better the world.The Society is comprised of Princeton Montessori School ( PMONTS) and Princeton Center for Teacher Education (PCTE). The Society provides Montessori education for children from infancy through middle school, summer enrichment for infants-lower elementary-aged students, trains prospective Montessori teachers, and educates parents. Founded in 1968, Princeton Montessori School is an independent, co-educational day school, dedicated to the highest quality education of children and developing passion and nurturing the potential in each child,through the values and principles of the Montessori philosophy.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>