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        <EOYAmt>304582</EOYAmt>
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      <LandBldgEquipCostOrOtherBssAmt>37435</LandBldgEquipCostOrOtherBssAmt>
      <LandBldgEquipAccumDeprecAmt>14038</LandBldgEquipAccumDeprecAmt>
      <LandBldgEquipBasisNetGrp>
        <BOYAmt>30884</BOYAmt>
        <EOYAmt>23397</EOYAmt>
      </LandBldgEquipBasisNetGrp>
      <TotalAssetsGrp>
        <BOYAmt>315127</BOYAmt>
        <EOYAmt>328932</EOYAmt>
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      <AccountsPayableAccrExpnssGrp>
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        <EOYAmt>5311</EOYAmt>
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      <MortgNotesPyblScrdInvstPropGrp>
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        <EOYAmt>24717</EOYAmt>
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      <TotalLiabilitiesGrp>
        <BOYAmt>44586</BOYAmt>
        <EOYAmt>30028</EOYAmt>
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      <OrganizationFollowsFASB117Ind>X</OrganizationFollowsFASB117Ind>
      <NoDonorRestrictionNetAssetsGrp>
        <BOYAmt>270541</BOYAmt>
        <EOYAmt>298904</EOYAmt>
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      <TotalNetAssetsFundBalanceGrp>
        <BOYAmt>270541</BOYAmt>
        <EOYAmt>298904</EOYAmt>
      </TotalNetAssetsFundBalanceGrp>
      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>315127</BOYAmt>
        <EOYAmt>328932</EOYAmt>
      </TotLiabNetAssetsFundBalanceGrp>
      <ReconcilationRevenueExpnssAmt>28363</ReconcilationRevenueExpnssAmt>
      <MethodOfAccountingCashInd>X</MethodOfAccountingCashInd>
      <AccountantCompileOrReviewInd>false</AccountantCompileOrReviewInd>
      <FSAuditedInd>true</FSAuditedInd>
      <FSAuditedBasisGrp>
        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
      </FSAuditedBasisGrp>
      <AuditCommitteeInd>true</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>false</FederalGrantAuditRequiredInd>
      <FederalGrantAuditPerformedInd>true</FederalGrantAuditPerformedInd>
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    <IRS990ScheduleD documentId="990D" softwareId="23017659" softwareVersionNum="23.1.0.0">
      <InclEscrowCustodialAcctLiabInd>false</InclEscrowCustodialAcctLiabInd>
      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>37435</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>14038</DepreciationAmt>
        <BookValueAmt>23397</BookValueAmt>
      </EquipmentGrp>
      <TotalBookValueLandBuildingsAmt>23397</TotalBookValueLandBuildingsAmt>
      <OtherSecuritiesGrp>
        <Desc>Financial derivatives and other financial products</Desc>
      </OtherSecuritiesGrp>
      <OtherSecuritiesGrp>
        <Desc>Closely-held equity interests</Desc>
      </OtherSecuritiesGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>Federal income taxes</Desc>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>Bank Overdraft</Desc>
      </OtherLiabilitiesOrgGrp>
      <TotalRevEtcAuditedFinclStmtAmt>1264705</TotalRevEtcAuditedFinclStmtAmt>
      <RevenueSubtotalAmt>1264705</RevenueSubtotalAmt>
      <TotalRevenuePerForm990Amt>1264705</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>1236342</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesSubtotalAmt>1236342</ExpensesSubtotalAmt>
      <TotalExpensesPerForm990Amt>1236342</TotalExpensesPerForm990Amt>
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    <IRS990ScheduleL documentId="990L" softwareId="23017659" softwareVersionNum="23.1.0.0">
      <LoansBtwnOrgInterestedPrsnGrp>
        <PersonNm>SANDRA LAEMMEL</PersonNm>
        <RelationshipWithOrgTxt>PRESIDENT</RelationshipWithOrgTxt>
        <LoanPurposeTxt>FICA ON AUTO FRINGE</LoanPurposeTxt>
        <LoanFromOrganizationInd>X</LoanFromOrganizationInd>
        <OriginalPrincipalAmt>18</OriginalPrincipalAmt>
        <BalanceDueAmt>18</BalanceDueAmt>
        <DefaultInd>false</DefaultInd>
        <BoardOrCommitteeApprovalInd>true</BoardOrCommitteeApprovalInd>
        <WrittenAgreementInd>true</WrittenAgreementInd>
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      <TotalBalanceDueAmt>18</TotalBalanceDueAmt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part II Line 1</FormAndLineReferenceDesc>
        <ExplanationTxt>Loan to President was Fica on auto fringe only, computed after year end, and paid in full in March 2024.</ExplanationTxt>
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        <FormAndLineReferenceDesc>Form 990, Part IV, Line 26</FormAndLineReferenceDesc>
        <ExplanationTxt>Only loan to Officer is fica on auto fringe, computed after year end, included on Officers W-2, and paid back in full during March 2024.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>President reviews Form 990 with CPA prior to filing.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 15a, 15b</FormAndLineReferenceDesc>
        <ExplanationTxt>Compensation is approved by members. Trustees review and approve compensation.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>The Organization does not make available to the public its governing documents and financial statements.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VIII, Section Program Service Revenue, Line 2b</FormAndLineReferenceDesc>
        <ExplanationTxt>MBA Commissions Remuneration for filing reports to the National Association for union members.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VIII, Section Program Service Revenue, Line 2c</FormAndLineReferenceDesc>
        <ExplanationTxt>National Sick Benefit Association commissions Remuneration for filing reports to the National Association for union members.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IV, Section Checklist of Required Schedules, Line 34</FormAndLineReferenceDesc>
        <ExplanationTxt>Schedule R, Part V Line 1n Association owns 100 of NALC Building Corp located at the same address.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IV, Section Checklist of Required Schedules, Line 34</FormAndLineReferenceDesc>
        <ExplanationTxt>Part V Association Officers also manage 100 owned NALC Building Corp. NALC Building Corp. has only this Association as a tenant and has very few transactions to record.</ExplanationTxt>
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      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>National Association of Letter Carriers Br 1 Building Corp</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>1400 Trumbull</AddressLine1Txt>
          <CityNm>Detroit</CityNm>
          <StateAbbreviationCd>MI</StateAbbreviationCd>
          <ZIPCd>48216</ZIPCd>
        </USAddress>
        <EIN>382868918</EIN>
        <PrimaryActivitiesTxt>Lessor</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>MI</LegalDomicileStateCd>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <EntityTypeTxt>C Corp</EntityTypeTxt>
        <OwnershipPct>1.00000</OwnershipPct>
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        <ControlledOrganizationInd>false</ControlledOrganizationInd>
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      <ReceiptOfIntAnntsRntsRyltsInd>false</ReceiptOfIntAnntsRntsRyltsInd>
      <GiftGrntOrCapContriToOthOrgInd>false</GiftGrntOrCapContriToOthOrgInd>
      <GiftGrntCapContriFromOthOrgInd>false</GiftGrntCapContriFromOthOrgInd>
      <LoansOrGuaranteesToOtherOrgInd>true</LoansOrGuaranteesToOtherOrgInd>
      <LoansOrGuaranteesFromOthOrgInd>false</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>false</DivRelatedOrganizationInd>
      <AssetSaleToOtherOrgInd>false</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>false</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>false</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>false</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>true</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>false</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>false</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>true</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>true</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>false</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>false</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>false</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>false</TransferFromOtherOrgInd>
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          <BusinessNameLine1Txt>NALC Branch 1 Building Corp</BusinessNameLine1Txt>
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        <InvolvedAmt>25903</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>Cash payment of expenses</MethodOfAmountDeterminationTxt>
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