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    <ReturnTs>2020-05-26T12:19:17-04:00</ReturnTs>
    <TaxPeriodEndDt>2019-12-31</TaxPeriodEndDt>
    <PreparerFirmGrp>
      <PreparerFirmName>
        <BusinessNameLine1Txt>CJ Randolph CPA</BusinessNameLine1Txt>
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      <PreparerUSAddress>
        <AddressLine1Txt>327 Missouri Ave Suite 420</AddressLine1Txt>
        <CityNm>East Saint Louis</CityNm>
        <StateAbbreviationCd>IL</StateAbbreviationCd>
        <ZIPCd>62201</ZIPCd>
      </PreparerUSAddress>
    </PreparerFirmGrp>
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    <TaxPeriodBeginDt>2019-01-01</TaxPeriodBeginDt>
    <Filer>
      <EIN>201569879</EIN>
      <BusinessName>
        <BusinessNameLine1Txt>MT SINAI DEVELOPMENT CORPORATION</BusinessNameLine1Txt>
      </BusinessName>
      <BusinessNameControlTxt>MTSI</BusinessNameControlTxt>
      <USAddress>
        <AddressLine1Txt>1200 SAINT LOUIS AVENUE</AddressLine1Txt>
        <CityNm>East Saint Louis</CityNm>
        <StateAbbreviationCd>IL</StateAbbreviationCd>
        <ZIPCd>62201</ZIPCd>
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    <BusinessOfficerGrp>
      <PersonNm>Herman L Watson Reverend</PersonNm>
      <PersonTitleTxt>President</PersonTitleTxt>
      <PhoneNum>6186220409</PhoneNum>
      <SignatureDt>2020-05-20</SignatureDt>
      <DiscussWithPaidPreparerInd>false</DiscussWithPaidPreparerInd>
    </BusinessOfficerGrp>
    <PreparerPersonGrp>
      <PreparerPersonNm>Carla J Randolph</PreparerPersonNm>
      <PTIN>P00625561</PTIN>
      <PhoneNum>6182717599</PhoneNum>
      <PreparationDt>2020-05-26</PreparationDt>
      <SelfEmployedInd>X</SelfEmployedInd>
    </PreparerPersonGrp>
    <FilingSecurityInformation>
      <IPAddress>
        <IPv4AddressTxt>107.192.124.114</IPv4AddressTxt>
      </IPAddress>
      <IPDt>2020-06-01</IPDt>
      <IPTm>14:51:53</IPTm>
      <FederalOriginalSubmissionId>3709082020153puxbzcw</FederalOriginalSubmissionId>
      <FederalOriginalSubmissionIdDt>2020-06-01</FederalOriginalSubmissionIdDt>
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    <TaxYr>2019</TaxYr>
    <BuildTS>2021-01-29 14:40:06Z</BuildTS>
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      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <ScheduleBNotRequiredInd>X</ScheduleBNotRequiredInd>
      <Organization501c3Ind referenceDocumentId="990A">X</Organization501c3Ind>
      <TypeOfOrganizationCorpInd>X</TypeOfOrganizationCorpInd>
      <GrossReceiptsAmt>137444</GrossReceiptsAmt>
      <InfoInScheduleOPartIInd>X</InfoInScheduleOPartIInd>
      <ContributionsGiftsGrantsEtcAmt>137444</ContributionsGiftsGrantsEtcAmt>
      <TotalRevenueAmt>137444</TotalRevenueAmt>
      <PrintingPublicationsPostageAmt>163364</PrintingPublicationsPostageAmt>
      <OtherExpensesTotalAmt>166739</OtherExpensesTotalAmt>
      <TotalExpensesAmt>330103</TotalExpensesAmt>
      <ExcessOrDeficitForYearAmt>-192659</ExcessOrDeficitForYearAmt>
      <NetAssetsOrFundBalancesBOYAmt>628790</NetAssetsOrFundBalancesBOYAmt>
      <NetAssetsOrFundBalancesEOYAmt>436131</NetAssetsOrFundBalancesEOYAmt>
      <InfoInScheduleOPartIIInd>X</InfoInScheduleOPartIIInd>
      <CashSavingsAndInvestmentsGrp>
        <BOYAmt>24626</BOYAmt>
        <EOYAmt>2913</EOYAmt>
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      <LandAndBuildingsGrp>
        <BOYAmt>76944</BOYAmt>
        <EOYAmt>76944</EOYAmt>
      </LandAndBuildingsGrp>
      <OtherAssetsTotalDetail>
        <BOYAmt>545158</BOYAmt>
        <EOYAmt>373737</EOYAmt>
      </OtherAssetsTotalDetail>
      <Form990TotalAssetsGrp>
        <BOYAmt>646728</BOYAmt>
        <EOYAmt>453594</EOYAmt>
      </Form990TotalAssetsGrp>
      <SumOfTotalLiabilitiesGrp>
        <BOYAmt>17938</BOYAmt>
        <EOYAmt>17463</EOYAmt>
      </SumOfTotalLiabilitiesGrp>
      <NetAssetsOrFundBalancesGrp>
        <BOYAmt>628790</BOYAmt>
        <EOYAmt>436131</EOYAmt>
      </NetAssetsOrFundBalancesGrp>
      <PrimaryExemptPurposeTxt>To acquire land for Community Developmen</PrimaryExemptPurposeTxt>
      <ProgramSrvcAccomplishmentGrp>
        <DescriptionProgramSrvcAccomTxt>To acquire undeveloped/ unused land for low cost housing project and community deveoplment</DescriptionProgramSrvcAccomTxt>
      </ProgramSrvcAccomplishmentGrp>
      <TotalProgramServiceExpensesAmt>0</TotalProgramServiceExpensesAmt>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Herman L Watson</PersonNm>
        <TitleTxt>President</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>2.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
        <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
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      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Zina Cruise</PersonNm>
        <TitleTxt>Member</TitleTxt>
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        <CompensationAmt>0</CompensationAmt>
        <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
        <ExpenseAccountOtherAllwncAmt>0</ExpenseAccountOtherAllwncAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Rhonda Jones</PersonNm>
        <TitleTxt>Secretary</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>1.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
        <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
        <ExpenseAccountOtherAllwncAmt>0</ExpenseAccountOtherAllwncAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Henry Matthews</PersonNm>
        <TitleTxt>Treasurer</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>1.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
        <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
        <ExpenseAccountOtherAllwncAmt>0</ExpenseAccountOtherAllwncAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Anthony Neely</PersonNm>
        <TitleTxt>Member</TitleTxt>
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        <CompensationAmt>0</CompensationAmt>
        <EmployeeBenefitProgramAmt>0</EmployeeBenefitProgramAmt>
        <ExpenseAccountOtherAllwncAmt>0</ExpenseAccountOtherAllwncAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <ActivitiesNotPreviouslyRptInd>false</ActivitiesNotPreviouslyRptInd>
      <ChgMadeToOrgnzngDocNotRptInd>false</ChgMadeToOrgnzngDocNotRptInd>
      <OrganizationHadUBIInd>false</OrganizationHadUBIInd>
      <SubjectToProxyTaxInd>false</SubjectToProxyTaxInd>
      <OrganizationDissolvedEtcInd>false</OrganizationDissolvedEtcInd>
      <Form1120PolFiledInd>false</Form1120PolFiledInd>
      <MadeLoansToFromOfficersInd>false</MadeLoansToFromOfficersInd>
      <EngagedInExcessBenefitTransInd>false</EngagedInExcessBenefitTransInd>
      <ProhibitedTaxShelterTransInd>false</ProhibitedTaxShelterTransInd>
      <StatesWhereCopyOfReturnIsFldCd>IL</StatesWhereCopyOfReturnIsFldCd>
      <BooksInCareOfDetail>
        <PersonNm>Herman L Watson Reverend</PersonNm>
        <USAddress>
          <AddressLine1Txt>1200 SAINT LOUIS AVENUE</AddressLine1Txt>
          <CityNm>East Saint Louis</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>62201</ZIPCd>
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        <PhoneNum>6186220409</PhoneNum>
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      <ForeignFinancialAccountInd>false</ForeignFinancialAccountInd>
      <ForeignOfficeInd>false</ForeignOfficeInd>
      <DonorAdvisedFndsInd>false</DonorAdvisedFndsInd>
      <OperateHospitalInd>false</OperateHospitalInd>
      <TanningServicesProvidedInd>false</TanningServicesProvidedInd>
      <RelatedOrganizationCtrlEntInd>false</RelatedOrganizationCtrlEntInd>
      <TransactionWithControlEntInd>false</TransactionWithControlEntInd>
      <PoliticalCampaignActyInd>false</PoliticalCampaignActyInd>
      <LobbyingActivitiesInd>false</LobbyingActivitiesInd>
      <SchoolOperatingInd>false</SchoolOperatingInd>
      <TrnsfrExmptNonChrtblRltdOrgInd>false</TrnsfrExmptNonChrtblRltdOrgInd>
      <PartVIOfCompOfHghstPdEmplTxt>NONE</PartVIOfCompOfHghstPdEmplTxt>
      <PartVIHghstPdCntrctProfSrvcTxt>NONE</PartVIHghstPdCntrctProfSrvcTxt>
      <FiledScheduleAInd>true</FiledScheduleAInd>
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    <IRS990ScheduleA documentId="990A">
      <CommunityTrustInd>X</CommunityTrustInd>
      <GiftsGrantsContriRcvd170Grp>
        <CurrentTaxYearMinus4YearsAmt>19710</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>29557</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>364283</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearAmt>196033</CurrentTaxYearAmt>
        <TotalAmt>609583</TotalAmt>
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      <TotalCalendarYear170Grp>
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        <CurrentTaxYearMinus3YearsAmt>29557</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>364283</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearAmt>196033</CurrentTaxYearAmt>
        <TotalAmt>609583</TotalAmt>
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      <PublicSupportTotal170Amt>609583</PublicSupportTotal170Amt>
      <GrossInvestmentIncome170Grp>
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        <CurrentTaxYearMinus3YearsAmt>1000</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>750</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>8725</CurrentTaxYearMinus1YearAmt>
        <TotalAmt>16955</TotalAmt>
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      <TotalSupportAmt>626538</TotalSupportAmt>
      <PublicSupportCY170Pct>0.97290</PublicSupportCY170Pct>
      <ThirtyThrPctSuprtTestsCY170Ind>X</ThirtyThrPctSuprtTestsCY170Ind>
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    <IRS990ScheduleO documentId="990O">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Description of other expenses Part I line 16</FormAndLineReferenceDesc>
        <ExplanationTxt>Description AmountEquity interest in Sinai Village 166,739</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Description of other assets Part II line 24</FormAndLineReferenceDesc>
        <ExplanationTxt>Category Beginning of Year End of YearAccounts Receivable 162,883 132,340Notes &amp; loans Receivable 1,609 1,609Investments Program related 317,827 151,088Other 62,839 88,700</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Description of total liabilities Part II line 26</FormAndLineReferenceDesc>
        <ExplanationTxt>Category Beginning of Year End of YearAccounts payable 475 0Unsecured notes 17,463 17,463</ExplanationTxt>
      </SupplementalInformationDetail>
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