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      <MissionDesc>See Schedule OThe mission of The Post Oak School is to prepare an outstanding Montessori environment that fosters collaboration, cooperation and peace, and to provide experiences that promote curiosity, inquiry and engagement. Designed according to the physical, emotional, social, and intellectual characteristics and needs of the learner, our methods guide and nurture each individual from infancy to adulthood. The School's approach is grounded in the principles of AMI Montessori education.</MissionDesc>
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      <Desc>The Post Oak School provides a comprehensive Montessori education, based on the principles and practices of Association Montessori Internationale (AMI) and accredited by the International Schools of the Southwest (ISAS), to a diverse population of approximately 500 students from infancy to high school. In keeping with Dr. Montessori's ideals, children work in multi-age classrooms with a high level of freedom in choosing their own foundations in language, math, geography, science, music, and other disciplines. The Middle School and High School are located on a second campus in the museum district of Houston which incorporates the principles of Dr. Montessori as well as the International Baccalaureate.</Desc>
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        <Desc>The Post Oak School offers an extensive program of parent education. A free series of four classes, repeated throughout the year, offers general information about Montessori education to both prospective parents and interested visitors. The infant-parent program helps parents of toddlers raise happy, self confident children. A variety of other classes, lectures, and other presentations during the school year, some free and open to the public and others by reservation, afford a variety of perspectives on the School's primary purpose of raising intelligent, confident, caring, and self-motivated lifelong learners.</Desc>
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        <Desc>Community service is deeply ingrained in the Montessori curriculum, from infancy through adolescence. By the time of Middle School, the entire class spends a half day each week working in small groups at various service agencies around Houston. Elementary students have ongoing relationships with other agencies, whether through regular site visits for volunteer work or by working on projects to benefit needy people in more distant places. Older children routinely learn the benefits and blessing of aiding others in the school's multi-age classrooms. Even the infants, living in a small tight-knit community, discover early on that other people have feelings.</Desc>
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        <Desc>Faculty and Staff regularly present at national Montessori conferences and attend both national and international Montessori congresses. The School's administration has led the formation of a national Montessori administrators association. Multiple organizations, whether devoted to Montessori or traditional education, like the North American Montessori Teachers Association (NAMTA) or Independent School Management (ISM) recommend Post Oak materials, policies, and procedures as models of best practices for similar schools.</Desc>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Kelly Vaughn</PersonNm>
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      <Form990PartVIISectionAGrp>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Emily Milani</PersonNm>
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        <PersonNm>James Quillin</PersonNm>
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      <ContractorCompensationGrp>
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      <ContractorCompensationGrp>
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          <USAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
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          <USAddress>
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      <ProgramServiceRevenueGrp>
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        <DepreciationAmt>8583707</DepreciationAmt>
        <BookValueAmt>9961348</BookValueAmt>
      </BuildingsGrp>
      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>1645219</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>1395209</DepreciationAmt>
        <BookValueAmt>250010</BookValueAmt>
      </EquipmentGrp>
      <OtherLandBuildingsGrp>
        <OtherCostOrOtherBasisAmt>35897</OtherCostOrOtherBasisAmt>
        <BookValueAmt>35897</BookValueAmt>
      </OtherLandBuildingsGrp>
      <TotalBookValueLandBuildingsAmt>22052017</TotalBookValueLandBuildingsAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>Operating lease liability</Desc>
        <Amt>110550</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>110550</TotalLiabilityAmt>
      <TotalRevEtcAuditedFinclStmtAmt>14713633</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>252083</NetUnrealizedGainsInvstAmt>
      <RevenueNotReportedAmt>252083</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>14461550</RevenueSubtotalAmt>
      <OtherRevenuesNotIncludedAmt>1354241</OtherRevenuesNotIncludedAmt>
      <RevenueNotReportedFinclStmtAmt>1354241</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>15815791</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>13958627</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>13958627</ExpensesSubtotalAmt>
      <OtherExpensesNotIncludedAmt>1354241</OtherExpensesNotIncludedAmt>
      <ExpensesNotRptFinclStmtAmt>1354241</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>15312868</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part V, Line 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>The Endowment fund is dedicated to benefitting The Post Oak School by supporting program enrichment, specific teaching programs, Montessori training, staff professional development, tuition assistance, and facilities operation and maintenance.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part XI, Line 4b - Other Adjustments:</FormAndLineReferenceDesc>
        <ExplanationTxt>Financial aid to students 1,309,880. School event expenses 44,361.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part XII, Line 4b - Other Adjustments:</FormAndLineReferenceDesc>
        <ExplanationTxt>Financial aid to students 1,309,880. School event expenses 44,361.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleE documentId="RetDoc1040400001">
      <NondiscriminatoryPolicyStmtInd>1</NondiscriminatoryPolicyStmtInd>
      <PolicyStmtInBrochuresEtcInd>1</PolicyStmtInBrochuresEtcInd>
      <PlcyPblczdViaBroadcastMediaInd>1</PlcyPblczdViaBroadcastMediaInd>
      <MaintainRacialCompRecsInd>1</MaintainRacialCompRecsInd>
      <MaintainScholarshipsRecsInd>1</MaintainScholarshipsRecsInd>
      <MaintainCpyOfBrochuresEtcInd>1</MaintainCpyOfBrochuresEtcInd>
      <MaintainCpyOfAllSolInd>1</MaintainCpyOfAllSolInd>
      <DiscriminateRaceStdntsRghtsInd>0</DiscriminateRaceStdntsRghtsInd>
      <DiscriminateRaceAdmissPlcyInd>0</DiscriminateRaceAdmissPlcyInd>
      <DiscriminateRaceEmplmFcultyInd>0</DiscriminateRaceEmplmFcultyInd>
      <DiscriminateRaceSchsInd>0</DiscriminateRaceSchsInd>
      <DiscriminateRaceEducPlcyInd>0</DiscriminateRaceEducPlcyInd>
      <DiscriminateRaceUseOfFcltsInd>0</DiscriminateRaceUseOfFcltsInd>
      <DiscriminateRaceAthltProgInd>0</DiscriminateRaceAthltProgInd>
      <DiscriminateRaceOtherActyInd>0</DiscriminateRaceOtherActyInd>
      <GovernmentFinancialAidRcvdInd>0</GovernmentFinancialAidRcvdInd>
      <GovernmentFinancialAidRvkdInd>0</GovernmentFinancialAidRvkdInd>
      <ComplianceWithRevProc7550Ind>1</ComplianceWithRevProc7550Ind>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule E, Part I, Line 3</FormAndLineReferenceDesc>
        <ExplanationTxt>The School's nondiscriminatory policy is included in all literature that is given to prospective families applying to the school and on the website.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleE>
    <IRS990ScheduleG documentId="RetDoc1041300001">
      <FundraisingEventInformationGrp>
        <Event1Nm>Golf fundraiser</Event1Nm>
        <GrossReceiptsEvent1Amt>102760</GrossReceiptsEvent1Amt>
        <CharitableContriEvent1Amt>66755</CharitableContriEvent1Amt>
        <GrossRevenueEvent1Amt>36005</GrossRevenueEvent1Amt>
        <RentFacilityCostsEvent1Amt>48136</RentFacilityCostsEvent1Amt>
        <OtherDirectExpensesEvent1Amt>28018</OtherDirectExpensesEvent1Amt>
        <GrossReceiptsTotalAmt>102760</GrossReceiptsTotalAmt>
        <CharitableContributionsTotAmt>66755</CharitableContributionsTotAmt>
        <GrossRevenueTotalEventsAmt>36005</GrossRevenueTotalEventsAmt>
        <RentFcltyCostsTotalEventsAmt>48136</RentFcltyCostsTotalEventsAmt>
        <OthDirectExpnssTotalEventsAmt>28018</OthDirectExpnssTotalEventsAmt>
        <DirectExpenseSummaryEventsAmt>76154</DirectExpenseSummaryEventsAmt>
        <NetIncomeSummaryAmt>-40149</NetIncomeSummaryAmt>
      </FundraisingEventInformationGrp>
    </IRS990ScheduleG>
    <IRS990ScheduleI documentId="RetDoc1041900001">
      <GrantRecordsMaintainedInd>1</GrantRecordsMaintainedInd>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>Financial aid</GrantTypeTxt>
        <RecipientCnt>77</RecipientCnt>
        <CashGrantAmt>1309880</CashGrantAmt>
        <NonCashAssistanceDesc>Tuition reduction</NonCashAssistanceDesc>
      </GrantsOtherAsstToIndivInUSGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>Financial aid is awarded based on the relative need of families that have applied and on funds available. Families must reapply for financial assistance each year. Additional information and applications are available on the School's website.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleI>
    <IRS990ScheduleJ documentId="RetDoc1042400001">
      <CompensationCommitteeInd>X</CompensationCommitteeInd>
      <IndependentConsultantInd>X</IndependentConsultantInd>
      <WrittenEmploymentContractInd>X</WrittenEmploymentContractInd>
      <CompensationSurveyInd>X</CompensationSurveyInd>
      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
      <SeverancePaymentInd>0</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>0</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>0</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>0</CompBasedOnRevenueOfFlngOrgInd>
      <CompBsdOnRevRelatedOrgsInd>0</CompBsdOnRevRelatedOrgsInd>
      <CompBsdNetEarnsFlngOrgInd>0</CompBsdNetEarnsFlngOrgInd>
      <CompBsdNetEarnsRltdOrgsInd>0</CompBsdNetEarnsRltdOrgsInd>
      <AnyNonFixedPaymentsInd>0</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>0</InitialContractExceptionInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Maura Joyce</PersonNm>
        <TitleTxt>President, Head of School</TitleTxt>
        <BaseCompensationFilingOrgAmt>326014</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>40900</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>6376</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>373290</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Kelly Vaughn</PersonNm>
        <TitleTxt>CFO</TitleTxt>
        <BaseCompensationFilingOrgAmt>198164</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>11987</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>6376</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>216527</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part III, line 3</FormAndLineReferenceDesc>
        <ExplanationTxt>The Post Oak School no longer conducts the Houston Montessori Institute. Instead, the School is now partnering with the Montessori Institute of North Texas (MINT). MINT is a well-established training center with a comprehensive team in place and a state-of-the-art facility, offering courses at all levels both in the summer and year-round. The Post Oak School now hosts training courses as the Houston satellite campus of MINT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>Form 990 is reviewed by the CFO and the Audit Committee. After approval, a final copy is made available for all Trustees to review via the Board of Trustees portal on the School website. Trustees are asked to review and comment on the Form prior to filing with the IRS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>Compliance with the conflict of interest policy is enforced through the use of an annual questionnaire. The completed questionnaires are reviewed by the Board Chair, President, and CFO to confirm that no potential conflicts of interest exist.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>The Head of School's annual compensation is determined by the Head Support &amp; Evaluation Committee using NAIS and ISAS along with using a compensation consultant and other data points in addition to the Committee's performance review. The Committee then presents its findings to the full Board who vote on the compensation amount and contract renewal. The Head Support &amp; Evaluation Committee reviews the comparative data that is used to determine the compensation of other key employees.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>Governing documents, policies, and financial statements are made available upon request.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XI, line 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>Change in value of derivative agreement 109,940.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>
