Document And Entity Information Statistical Measurement [Axis] us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Note To Financial Statement Details Textual Significant Accounting Policies us-gaap_IncomeTaxExpenseBenefit Income Tax Expense (Benefit) Note 2 - Significant Accounting Policies ecd_NonRule10b51ArrTrmntdFlag Non-Rule 10b5-1 Arrangement Terminated [Flag] Note 3 - Deferred Costs and Intangible Assets Restricted cash Restricted cash Restricted cash us-gaap_DividendsPayableAmountPerShare Dividends Payable, Amount Per Share (in dollars per share) ecd_NonRule10b51ArrAdoptedFlag Non-Rule 10b5-1 Arrangement Adopted [Flag] Note 4 - Notes Payable Trading Arrangements, by Individual [Table] Note 5 - Rental Income Under Operating Leases Material Terms of Trading Arrangement [Text Block] Note 6 - Fair Value of Financial Instruments Note 7 - Commitments and Contingencies Note 9 - Segment Reporting Note 2 - Significant Accounting Policies - Estimated Useful Lives of Assets (Details) Note 2 - Significant Accounting Policies - Basic and Diluted Earnings (Details) Minimum [Member] Comprehensive Income, Policy [Policy Text Block] Note 3 - Deferred Costs and Intangible Assets - Deferred Costs and Intangible Assets (Details) Note 3 - Deferred Costs and Intangible Assets - Future Amortization Expense (Details) Statistical Measurement [Domain] Note 4 - Notes Payable - Mortgages and Mezzanine Note Payable (Details) Maximum [Member] Note 4 - Notes Payable - Summary of Principal Payment Requirements (Details) Note 5 - Rental Income Under Operating Leases - Minimum Future Cash Rents Receivable (Details) Note 6 - Fair Value of Financial Instruments - Carrying Amount and Fair Value of Mortgage Notes Payable (Details) Litigation Case [Domain] Note 7 - Commitments and Contingencies - Summary of Concentration Risk by Segment (Details) Note 9 - Segment Reporting - Segment Information (Details) Accounts payable and accrued liabilities Notes To Financial Statements Notes To Financial Statements [Abstract] Office Building [Member] Schedules of Concentration of Risk, by Risk Factor [Table Text Block] Apartment Building [Member] Subtotal Net income after participating securities portion that available to common stockholders. Counterparty Name [Axis] Clover House [Member] Related to the Clover House property. us-gaap_Dividends Dividends and distributions Metlife Real Estate Lending LLC [Member] Represents information related to Metlife Real Estate Lending LLC. Clover House Loans [Member] Represents information related to clover house loans. Prepaid expenses and other assets Residential Property At 10 West 65th Street [Member] Represents the information pertaining to the residential property at 10 West 65th Street in Manhattan. Litigation Case [Axis] Counterparty Name [Domain] us-gaap_SharesOutstanding Balance (in shares) Balance (in shares) Preferred stock, dividend rate, percentage Dividends [Axis] Segment Reporting [Text Block] Dividends [Domain] clpr_ConsultingServicesInitialFee Consulting Services, Initial Fee Represents the initial fee on consulting services. us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment Proceeds from Sale, Real Estate, Held-for-Investment Ironhound Management [Member] Relating to Ironhound Management. Award Type [Axis] Segment Reporting [Table Text Block] Preferred stock, $0.01 par value; 100,000 shares authorized (including 140 shares of 12.5% Series A cumulative non-voting preferred stock), zero shares issued and outstanding Adjustments to reconcile net loss to net cash provided by operating activities: us-gaap_Liabilities TOTAL LIABILITIES Liabilities: us-gaap_LiabilitiesAndStockholdersEquity TOTAL LIABILITIES AND EQUITY (DEFICIT) Title and Position [Axis] Segment Reporting [Table] us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets Prepaid expenses, other assets and deferred costs Fixed Interest Rate Financing [Member] Represents a fixed rate financing package. Secured First Mortgage Loan [Member] Represents an initial fixed rate secured first mortgage loan. Stock-based compensation Subsequent Event [Member] Less: income attributable to participating securities Senior Notes [Member] clpr_DebtInstrumentExtensionOptionPeriod Debt Instrument, Extension Option Period Represents the debt instrument extension option period. Security deposits Lease Contractual Term [Axis] Lease Contractual Term [Domain] Changes in operating assets and liabilities: Preferred stock, shares issued (in shares) Preferred stock, shares outstanding (in shares) Preferred stock, shares authorized (in shares) Portion at Fair Value Measurement [Member] Reported Value Measurement [Member] Fair Value, by Balance Sheet Grouping [Table] Preferred stock, par value (in dollars per share) us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect Net increase in cash and cash equivalents and restricted cash us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents Cash and cash equivalents and restricted cash - beginning of period Cash and cash equivalents and restricted cash - end of period Allowance for doubtful accounts Estimate of Fair Value Measurement [Member] Non-cash interest capitalized to real estate under development Amount of other items capitalized to real estate under development during the period. New Accounting Pronouncements, Policy [Policy Text Block] Lessor, Lease, Description [Table] Antidilutive Securities, Name [Domain] Statement [Table] 1010 Pacific Street, Brooklyn, New York [Member] The property at 1010 Pacific Street, Brooklyn, New York. Interest rate Interest rate Citi Real Estate Funding Inc and Morgan Stanley Bank N.A. [Member] Represent the two lenders of Citi Real Estate Funding, Inc and Morgan Stanley Bank N.A. us-gaap_DebtInstrumentRepaidPrincipal Debt Instrument, Repaid, Principal Loan Agreement [Member] Represents Loan Agreement us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Lender [Domain] us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Multifamily [Member] Lender Name [Axis] us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Long-Term Debt, Type [Axis] us-gaap_EscrowDeposit Escrow Deposit Product and Service [Domain] Product and Service [Axis] Useful life (Year) Line of Credit [Member] us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear 2026 O2026 Q1 Dividends [Member] Represents ordinary dividends for Q1 of 2026. us-gaap_RepaymentsOfDebt Repayments of Debt Class and Collective Action Complaint [Member] Represents Class and Collective Action Complaint. us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables Tenant and other receivables us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent Accounts payable and accrued liabilities Commercial Real Estate [Member] clpr_DebtInstrumentDefaultPeriodToPayInterest Debt Instrument, Default, Period to Pay Interest Period to pay interest that a failure would result in default on the debt instrument. clpr_DebtInstrumentDefaultAdditionalInterest Debt Instrument, Default, Additional Interest Percentage of additional interest in the event of default on the debt instrument. us-gaap_ProceedsFromIssuanceOfDebt Proceeds from Issuance of Debt Schedule of Maturities of Long-Term Debt [Table Text Block] ASSETS Commitments and Contingencies Disclosure [Text Block] Statement [Line Items] Common Stock, Shares, Issued (in shares) Common Stock, Shares, Outstanding (in shares) Award Type [Domain] us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears 2030 us-gaap_LessorOperatingLeasePaymentsToBeReceived Total Common stock, shares authorized (in shares) Redemption of LTIP grants (in shares) Number of shares of stock issued during the period due to redemption of preferred stock. us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths 2027 us-gaap_LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear 2026 clpr_DebtInstrumentAccelerationAggregateReserveDeposit Debt Instrument, Acceleration, Aggregate Reserve Deposit The amount of aggregate reserve deposit due as a result of loan acceleration. us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears 2029 clpr_DebtInstrumentAccelerationDefaultYieldMaintenancePremiumDue Debt Instrument, Acceleration, Default Yield Maintenance Premium Due The amount of the default yield maintenance premium due as a result of acceleration. us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears 2028 Common stock, $0.01 par value; 500,000,000 shares authorized, 16,157,566 and 16,146,546 shares issued and outstanding, at March 31, 2026, and December 31, 2025, respectively Fair Value of Financial Instruments, Policy [Policy Text Block] clpr_PaymentsForProceedsFromLoanIssuanceAndExtinguishmentCosts Loan issuance and extinguishment costs The net cash outflow or inflow for loan issuance and extinguishment costs. clpr_DebtInstrumentCovenantNetWorth Debt Instrument, Covenant, Net Worth A covenant for a debt instrument requiring that the company to main a level of net worth. clpr_DebtInstrumentCovenantInterestRateIncreaseDecrease Debt Instrument, Covenant, Interest Rate, Increase (Decrease) Incremental percentage increase (decrease) in the stated rate on a debt instrument that is possible to achieve if certain covenants are met. Lessor, Operating Lease, Payment to be Received, Maturity [Table Text Block] us-gaap_PolicyTextBlockAbstract Accounting Policies us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements us-gaap_TableTextBlock Notes Tables us-gaap_ProceedsFromLinesOfCredit Long-Term Line of Credit Plaintiffs [Member] Relating to plaintiffs. Crowe Legal Matter [Member] Relating to the Crowe legal matter. us-gaap_ShortTermDebtRefinancedAmount Short-Term Debt, Refinanced, Amount Attorneys [Member] Relating to attorneys. MF1 Capital LLC [Member] Relating to MF1 Capital LLC. us-gaap_SegmentExpenditureAdditionToLongLivedAssets Capital expenditures Subsequent Events [Text Block] Concentration Risk Type [Axis] us-gaap_ProceedsFromIssuanceOfLongTermDebt Proceeds from Issuance of Long-Term Debt AIG Asset Management[Member] Represents AIG Asset Management, a lender with the Company. Significant Accounting Policies [Text Block] Senior Loan and Mezzanine Loan [Member] Represents the senior loan and mezzanine loan, or otherwise known as the combined loans. Proceeds from mortgage notes clpr_DebtInstrumentAmountOfCompletionReserveDeposits Debt Instrument, Amount of Completion Reserve Deposits Represents the amount of a completion reserve deposits account used in a debt instrument. clpr_DebtInstrumentAmountOfShortfallReserveAccount Debt Instrument, Amount of Shortfall Reserve Account Represents the amount of a shortfall reserve account used in a debt instrument. Real Estate, Policy [Policy Text Block] Construction Loans [Member] Concentration Risk Type [Domain] clpr_DebtInstrumentAmortizationPeriod Debt Instrument, Amortization Period Period for amortization on the debt instrument. Mortgages and Mezzanine Notes 4 [Member] Represents mortgages and mezzanine notes. us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo 2028 clpr_DebtInstrumentCovenantMinimumExtensionPeriodToNotFundReserveAccount Debt Instrument, Covenant, Minimum Extension Period to not Fund Reserve Account Minimum period of extension on the debt instrument required to not have to fund a reserve account. us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour 2030 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree 2029 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths 2027 Special Servicer [Member] Represents Special Servicer. clpr_EscrowDepositsAdditionalAmountPeriodOfPayments Escrow Deposits, Additional Amount, Period of Payments Period of payments for additional amount of escrow deposits. clpr_LessorOperatingLeaseTerminationPeriod Lessor, Operating Lease, Termination Period Period before termination of lease can occur for operating lease of the lessor, clpr_DebtInstrumentCovenantPotentialReserveAccount Debt Instrument, Covenant, Potential Reserve Account Amount of potential reserve account required under certain conditions according to the covenant of the debt instrument. LNR Partners [Member] Represents LNR Partners. clpr_DebtInstrumentPeriodOfInterestOnlyPayments Debt Instrument, Period of Interest Only Payments Period for interest only payments on the debt instrument. clpr_DebtInstrumentMaximumBorrowingCapacity Debt Instrument, Maximum Borrowing Capacity Maximum borrowing capacity under the debt instrument. clpr_DebtInstrumentNumberOfExtensions Debt Instrument, Number of Extensions The number of extension of the debt instrument. us-gaap_LongTermDebt Total debt, net of unamortized debt issuance costs clpr_LessorOperatingLeaseTerminationNoticePeriod Lessor, Operating Lease, Termination Notice Period Period of notice for termination of the operating lease of the lessor. Flagstar Bank [Member] Represents Flagstar Bank. us-gaap_LossContingencyAccrualAtCarryingValue Loss Contingency Accrual Statement of Stockholders' Equity [Abstract] Loss Contingency Nature [Axis] Statement of Cash Flows [Abstract] us-gaap_LossContingencyAccrualCarryingValuePeriodIncreaseDecrease Loss Contingency Accrual, Period Increase (Decrease) Long-Term Debt, Type [Domain] Equity Components [Axis] Share-Based Payment Arrangement [Policy Text Block] Equity Component [Domain] Additional Paid-in Capital [Member] Retained Earnings [Member] Loss Contingency, Nature [Domain] Real estate taxes and insurance Real estate taxes and insurance Bad debt (recovery) expense Subsequent Event Type [Domain] Subsequent Event [Table] Subsequent Event Type [Axis] OPERATING EXPENSES Total operating expenses us-gaap_CostOfRevenue Equity (Deficit): Employees [Member] Represents information regarding employees. Secured First Mortgage Note [Member] Represents information regarding a secured first mortgage note. US Bank [Member] Represents US Bank. Dean Member Loans [Member] Represents the dean member loans. clpr_RentPaymentsPerAnnum Rent Payments Per Annum The amount of rent payments per annum provided from the rental property. us-gaap_EscrowDepositsRelatedToPropertySales Escrow Deposits Related to Property Sales Fair Value Disclosures [Text Block] Reimbursable Payroll Expense [Member] Represents reimbursable payroll expense. Fair Value, by Balance Sheet Grouping [Table Text Block] Supplemental cash flow information: us-gaap_LettersOfCreditOutstandingAmount Letters of Credit Outstanding, Amount Secured Overnight Financing Rate (SOFR) [Member] Long-term debt Customer Concentration Risk [Member] Tenant and Other Receivables, Allowance for Doubtful Accounts, Policy [Policy Text Block] Disclosure of accounting policy for determining the allowance for doubtful accounts for tenants and other receivable balances, and when impairments, charge-offs or recoveries are recognized. Senior Notes us-gaap_LitigationSettlementExpense Litigation settlement and other Litigation Settlement, Fee Expense us-gaap_PaymentsForConstructionInProcess Payments for Construction in Process us-gaap_GainLossOnDispositionOfAssets1 Gain (Loss) on Disposition of Assets clpr_LitigationSettlementAmountAwardedToOtherPartyPerMonth Litigation Settlement, Amount Awarded to Other Party, Per Month Amount awarded to other party in judgment or settlement of litigation to be paid monthly. Wells Fargo Bank v Borrower and Operating Partnership [Member] Represents Wells Fargo Bank v Borrower and Operating Partnership. Long-Term Debt [Text Block] Other Commitments [Table] us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation Accumulated depreciation Tenant and other receivables, net of allowance for doubtful accounts of $292 and $317, respectively Other Commitments [Axis] Other Commitments [Domain] General and administrative General and administrative clpr_EscrowDepositsReserveAmount Escrow Deposits, Reserve Amount The reserve amount related to the escrow deposits. clpr_EscrowDepositsAdditionalAmount Escrow Deposits, Additional Amount The additional amount related to the escrow deposits. Additional paid-in-capital clpr_EscrowDepositsPerDiemInterestPayments Escrow Deposits, Per Diem Interest Payments The additional per diem interest payable for the escrow deposits. Non-controlling interests Segment Reporting, Policy [Policy Text Block] clpr_EscrowDepositsDefaultInterestPayments Escrow Deposits, Default Interest Payments The amount of default interest payable on the escrow deposits. Use of Estimates, Policy [Policy Text Block] us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Furniture, fixtures and equipment Amount before accumulated depreciation of furniture, fixtures and equipment. Includes, but is not limited to, furniture, machinery, equipment, and engines. us-gaap_PaymentsToAcquireRealEstate Additions to land, buildings, and improvements us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1 Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders Dividends and distributions Deferred costs Total debt Debt, gross Total Mortgages [Member] us-gaap_DebtInstrumentFaceAmount Debt Instrument, Face Amount Deferred costs and intangible assets, net Total deferred costs and intangible assets, net The net carrying amount of deferred costs and intangible assets. Geographic Concentration Risk [Member] In-place leases us-gaap_SecurityDepositLiability Security deposits us-gaap_LitigationSettlementAmountAwardedToOtherParty Litigation Settlement, Amount Awarded to Other Party us-gaap_DebtInstrumentFeeAmount Debt Instrument, Fee Amount clpr_CashCashEquivalentsAndRestrictedCashWithinAssetsHeldForSale Net cash and cash equivalents and restricted cash within assets held for sale The amount of cash, cash equivalents, and restricted cash within the assets held for sale during the period. Debt Instrument, Name [Domain] Maturity Maturity us-gaap_DebtInstrumentInterestRateStatedPercentage Debt Instrument, Interest Rate, Stated Percentage Depreciation us-gaap_DebtInstrumentInterestRateEffectivePercentage Debt Instrument, Interest Rate, Effective Percentage Class of Stock [Domain] Related and Nonrelated Parties [Axis] Property operating expenses Property operating expenses The aggregate amount of expenditures for property operating. us-gaap_DebtInstrumentPeriodicPayment Debt Instrument, Periodic Payment Schedule of Long-Term Debt Instruments [Table] Debt Instrument [Axis] CASH FLOWS FROM OPERATING ACTIVITIES CASH FLOWS FROM INVESTING ACTIVITIES us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash provided by operating activities CASH FLOWS FROM FINANCING ACTIVITIES us-gaap_NetCashProvidedByUsedInInvestingActivities Net cash provided (used) in investing activities us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash provided (used) by financing activities us-gaap_RealEstateInvestmentPropertyNet Investment in real estate, net us-gaap_RealEstateInvestmentPropertyAtCost Total investment in real estate Amortization of LTIP grants Amount of increase in noncontrolling interest from amortization of LTIP grants. Reallocation of noncontrolling interests Amount of increase (decrease) in noncontrolling interest from reallocation. Amortization of deferred costs and intangible assets The aggregate expense charged against earnings to allocate the deferred costs and cost of intangible assets Accounting Policies [Abstract] Lease origination costs Segments [Domain] Impairment of Long-Lived Assets to be Disposed of Loss on Impairment of long-lived assets Loss on impairment of Long-Lived Assets Segments [Axis] Income Statement [Abstract] us-gaap_NumberOfOperatingSegments Number of Operating Segments us-gaap_NumberOfReportableSegments Number of Reportable Segments Land and improvements Net loss attributable to common stockholders Net loss attributable to common stockholders us-gaap_DividendsPayableDateOfRecordDayMonthAndYear Dividends Payable, Date of Record Amortization of deferred financing costs Deferred rent us-gaap_AreaOfRealEstateProperty Area of Real Estate Property us-gaap_OtherCommitment Other Commitment us-gaap_CostsAndExpenses TOTAL OPERATING EXPENSES Series A Cumulative Non-Voting Preferred Stock [Member] Series A non-voting preferred stock upon which unpaid dividends accumulate until paid to shareholders. Classified within stockholders' equity if nonredeemable or redeemable solely at the option of the issuer. Classified within temporary equity if redemption is outside the control of the issuer. us-gaap_PaymentsForCapitalImprovements Payments for Capital Improvements Accounting Standards Update and Change in Accounting Principle [Table] Income Tax, Policy [Policy Text Block] us-gaap_RelatedPartyTransactionAmountsOfTransaction Related Party Transaction, Amounts of Transaction Related and Nonrelated Parties [Domain] Unamortized loan costs Unamortized debt issuance costs Related Party Transaction [Table] Related Party Transactions Disclosure [Text Block] clpr_NumberOfBuildings Number of Buildings The number of buildings owned. Tribeca House properties in Manhattan [Member] Represents the Tribeca House properties located at Manhattan. clpr_GrossLeasableArea Gross Leasable Area (Square Foot) The amount of floor space available to be rented in a property. Aspen [Member] A property located at 1955 First Avenue in Manhattan. Tribeca House properties in Manhattan, Building Two [Member] Represents the Building Two of Tribeca House properties in Manhattan. Measurement Basis [Axis] Tribeca House properties in Manhattan, Building One [Member] Represents the Building One of Tribeca House properties in Manhattan. Residential Rental [Member] A type of property that derives its revenue from dwelling units. Rental Retail and Parking [Member] Represents information pertaining to rental retail and parking. clpr_NumberOfRentableUnits Number of Rentable Units The number of rentable units in the properties. clpr_NumberOfStories Number of Stories The number of stories in the building. Office and Residential Building [Member] Building designed for conduct of business and residential. Interest Paid, Capitalized, Investing Activities 141 Livingston Street in Brooklyn [Member] Represents the information pertaining to 141 Livingston Street in Brooklyn. 250 Livingston Street in Brooklyn [Member] Represents information pertaining to 250 Livingston Street in Brooklyn. clpr_PercentageOfAggregateCashDistributionsFromAndProfitsAndLosses Percentage of Aggregate Cash Distributions From, and Profits and Losses The percentage of the aggregate cash distributions from LLCs that own the properties, and the profits and losses that the company is entitled to. Statement of Financial Position [Abstract] us-gaap_DividendPayableDateToBePaidDayMonthAndYear Dividends Payable, Date to be Paid LTIP Units [Member] Represents long term incentive units. us-gaap_RepaymentsOfNotesPayable Payments of mortgage notes Repayments of Notes Payable Class B LLC Units [Member] the class B LLC units that are convertible into common shares of the company on a one-for-one basis and are entitled to distributions. Property, Plant and Equipment, Useful Life [Table Text Block] Tabular disclosure of useful life of long lived, physical assets used in the normal conduct of business and not intended for resale. us-gaap_LossContingencyAccrualPayments Loss Contingency Accrual, Payments Furniture, Fixtures and Equipment [Member] Represents information pertaining to furniture, fixtures and equipment. clpr_LitigationSettlementAmountAwardedToOtherPartyAttorneyFees Litigation Settlement, Amount Awarded to Other Party, Attorney Fee's Amount awarded to other party in judgment or settlement of litigation for attorney fee's. clpr_LessorOperatingLeasePaymentToBeReceivedAfterYearFour Thereafter Amount of lease payment to be received by lessor for operating lease after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Tribeca House Properties [Member] Represents information pertaining to Tribeca House properties. The Kuzmich Case [Member] Represents the Kuzmich case. clpr_LongtermDebtMaturityAfterYearFour Thereafter Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). dei_DocumentType Document Type us-gaap_LessorOperatingLeaseRenewalTerm Lessor, Operating Lease, Renewal Term Document Information [Line Items] Document Quarterly Report us-gaap_LesseeOperatingLeaseTermOfContract Lessee, Operating Lease, Term of Contract Concentration Risk Concentration Risk, Percentage clpr_AmortizationOfLeaseOriginationCostsAndInPlaceLeaseIntangibleAssets Amortization of Lease Origination Costs and In-place Lease Intangible Assets The aggregate expense charged against earnings to allocate the lease origination costs and in-place lease intangible assets. Document Information [Table] clpr_AmortizationOfRealEstateAbatements Amortization of Real Estate Abatements The aggregate amount of expense charged against earnings in the period to allocate real estate abatements. Deferred Costs and Intangible Assets Disclosure [Text Block] The entire disclosure for deferred costs and intangible assets. us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Real estate tax abatements A temporary reduction or elimination of property taxes. Antidilutive Securities [Axis] clpr_DeferredCostsAndIntangibleAssetsGross Total deferred costs and intangible assets The amount of deferred costs and intangible assets before accumulated amortization. Notes payable, net of unamortized loan costs of $7,844 and $8,712, respectively us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment Weighted Average Number of Shares Outstanding, Diluted, Adjustment dei_EntityInteractiveDataCurrent Entity Interactive Data Current Schedule of Deferred Costs and Intangible Assets [Table Text Block] Tabular disclosure of deferred costs and intangible assets. clpr_DeferredCostsAndIntangibleAssetsAmortizationExpenseNextTwelveMonths 2026 Amount of amortization expense for deferred costs and intangible assets expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Document Transition Report us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding Weighted-average common shares outstanding (in shares) clpr_DeferredCostsAndIntangibleAssetsAmortizationExpenseYearTwo 2027 Amount of amortization expense for deferred costs and intangible assets expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. clpr_AccumulatedAmortizationOfDeferredCostsAndIntangibleAssets Less accumulated amortization Accumulated amortization of deferred costs and intangible assets at the end of the reporting period. Schedule of Deferred Costs and Intangible Assets, Future Amortization Expense [Table Text Block] Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for deferred costs and intangible assets. clpr_DeferredCostsAndIntangibleAssetsAmortizationExpenseYearFive 2030 Amount of amortization expense for deferred costs and intangible assets expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. First Mortgage Loan With Interest-only Payments [Member] Represents information pertaining to a first mortgage loan that requires interest-only payments for the entire term. clpr_DeferredCostsAndIntangibleAssetsAmortizationExpenseAfterYearFive Thereafter Amount of amortization expense for deferred costs and intangible assets expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. clpr_DeferredCostsAndIntangibleAssetsAmortizationExpenseYearThree 2028 Amount of amortization expense for deferred costs and intangible assets expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. clpr_DeferredCostsAndIntangibleAssetsAmortizationExpenseYearFour 2029 Amount of amortization expense for deferred costs and intangible assets expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Weighted-average common shares outstanding (in shares) clpr_DebtInstrumentPrepaymentOptionNumberOfMonthsBeforeMaturity Debt Instrument, Prepayment Option, Number of Months Before Maturity (Month) Represents the period of time before the maturity date, during which period the entity has the option to prepay all (but not less than all) of the unpaid balance of the debt instrument without a prepayment premium. Citi Real Estate Funding Inc. [Member] Represents information pertaining to Citi Real Estate Funding Inc. us-gaap_DebtInstrumentTerm Debt Instrument, Term Derivative Instrument [Axis] Basic and diluted net loss per share (in dollars per share) Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Title and Position [Domain] Earnings Per Share, Policy [Policy Text Block] BADF 953 Dean Street Lender LLC [Member] Relating to BADF 953 Dean Street Lender LLC. Document Fiscal Period Focus Project Loan [Member] Relating to project loans. Customer [Domain] Document Fiscal Year Focus Depreciation and amortization Depreciation and amortization clpr_DebtInstrumentInterestRateFloor Debt Instrument, Interest Rate Floor Represents the interest rate floor of a debt instrument. clpr_PolicyTable Amendment Flag Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Common Stock [Member] Other liabilities clpr_DebtInstrumentPaymentGuaranteePercentage Debt Instrument, Payment Guarantee Percentage Represents the percentage of payment guarantee on a debt instrument. dei_DocumentPeriodEndDate Document Period End Date Long-Lived Asset, Class [Domain] London Interbank Offered Rate [Member] Relating to the London Interbank Offered Rate (LIBOR). Legal Entity [Axis] Non-cash dividend declared Represents the amount of non-cash dividends declared during the period. dei_EntityFileNumber Entity File Number us-gaap_DerivativeFixedInterestRate Derivative, Fixed Interest Rate Entity Tax Identification Number Entity [Domain] Entity Central Index Key dei_EntityRegistrantName Entity Registrant Name dei_EntityCurrentReportingStatus Entity Current Reporting Status Entity Incorporation, State or Country Code Current Fiscal Year End Date Lessor, Operating Leases [Text Block] Entity Filer Category Non-employee Director [Member] Represents the non-employee director of the company. dei_EntityShellCompany Entity Shell Company Entity Emerging Growth Company Entity Small Business Building and Building Improvements [Member] Income from operations us-gaap_OperatingIncomeLoss INCOME (LOSS) FROM OPERATIONS Retail Site [Member] Dean Street, Prospect Heights [Member] Information regarding the properties on dean street in prospect heights. Name of Property [Domain] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Name of Property [Axis] us-gaap_InterestExpense Interest expense, net us-gaap_Revenues Revenues REVENUE us-gaap_LossContingencyLossInPeriod Loss Contingency Accrual, Loss (Reversal of Loss) us-gaap_InterestExpenseDebt Interest Expense, Debt dei_EntityAddressStateOrProvince Entity Address, State or Province dei_EntityAddressCityOrTown Entity Address, City or Town Bank Leumi, N.A [Member] Represents bank Leumi, a lender of the company. Interest Expense us-gaap_InterestExpenseNonoperating Accumulated deficit Horn v 50 Murray Street Acquisition LLC, Index No.152415/21 [Member] Represents information pertaining to Horn v 50 Murray Street Acquisition LLC, Supreme Court, New York County, Index No. 152415/21. dei_EntityAddressAddressLine1 Entity Address, Address Line One Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] dei_CityAreaCode City Area Code dei_LocalPhoneNumber Local Phone Number dei_EntityAddressPostalZipCode Entity Address, Postal Zip Code Title of 12(b) Security Security Exchange Name Trading Symbol Derivatives, Policy [Policy Text Block] Class of Stock [Axis] Collectability of Lease Receivables [Member] Information regarding the collection of lease receivables. Prime Rate [Member] Variable Rate [Axis] Variable Rate [Domain] Revenue [Policy Text Block] Related Party Transaction [Domain] dei_EntityCommonStockSharesOutstanding Entity Common Stock, Shares Outstanding (in shares) Related Party Transaction [Axis] Residential Property At 1010 Pacific Street [Member] Represents the residential property at 1010 Pacific Street. New York Community Bank [Member] Represents New York Community Bank, a lender of the company. us-gaap_NetIncomeLossAttributableToNoncontrollingInterest Net loss attributable to non-controlling interests Mortgages 2 [Member] Represents information pertaining to the second mortgage note agreement of a real estate property. Deutsche Bank [Member] Represents Deutsche Bank, a lender of the company. Net Loss Net loss Net loss Net loss 141 Livingston Street, Brooklyn [Member] Represents a property located at 141 Livingston Street, Brooklyn, New York. Scenario [Axis] Scenario [Domain] Mezzanine Note Agreement [Member] A hybrid of debt and equity financing that gives the lender the rights to convert to an ownership or equity interest in the company in case of default, after venture capital companies and other senior lenders are paid. Forecast [Member] Real Estate [Domain] clpr_TransactionPursuitSegmentCosts Transaction Pursuit Segment Costs The amount of transaction pursuit segment costs. Capital One Multifamily Finance LLC [Member] Represents Capital One Multifamily finance LLC, a lender of the company. Real Estate, Type of Property [Axis] Mortgages and Mezzanine Notes 1[Member] Represents the first mortgages and mezzanine notes of the property. Property, Plant, and Equipment [Table] Flatbush Gardens, Brooklyn, NY [Member] Represents properties located at Flatbush Gardens, Brooklyn, NY. Tenant improvements Total Revenue [Member] Total Revenue during the period when it serves as a benchmark in a concentration of risk calculation. Common stock, par value (in dollars per share) City of New York [Member] Represents the City of New York, a major lessee of the company. Mortgages and Mezzanine Notes 3[Member] Represents the third mortgages and mezzanine notes of the property. Mortgages and Mezzanine Notes [Member] Represents information pertaining to mortgages and mezzanine notes. us-gaap_OtherLiabilities Other liabilities Derivative Contract [Domain] Residential Properties [Member] Represents the Residential properties segment, a segment of the company. New York City [Member] Represents New York City. Commercial Segment [Member] Represents Commercial Properties segment, a reporting segment of the company. Long-Lived Asset, Class [Axis] Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Assets us-gaap_Assets TOTAL ASSETS Cash and Cash Equivalents, Policy [Policy Text Block] Deferred Charges, Policy [Policy Text Block] Cash and cash equivalents Cash and cash equivalents Cash and cash equivalents Geographical [Domain] Geographical [Axis] us-gaap_InterestPaid Interest Paid, Including Capitalized Interest, Operating and Investing Activities Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] us-gaap_EarningsPerShareDiluted Basic and diluted net loss per share attributable to common stockholders (in dollars per share) Interest Rate Cap [Member] Customer [Axis] Transaction Pursuit Costs, Policy [Policy Text Block] Disclosure of accounting policy for transaction pursuit costs. clpr_DebtInstrumentContingentFunding Debt Instrument, Contingent Funding Amount of additional funding available from a debt instrument contingent on certain financial targets. Valley National Bank [Member] Relating to Valley National Bank. Contingent Rate [member] Relating to contingent rate. clpr_ContractWithCustomerDeferredRevenue Deferred rent Amount of deferred income and obligation to transfer product and service from contract with customer for which consideration has been received or is receivable. Consolidation, Policy [Policy Text Block] Cash paid for interest, net of capitalized interest of $2,780 in 2025 Interest Paid, Excluding Capitalized Interest, Operating Activity Schedule of Long-Term Debt Instruments [Table Text Block] Intangible Asset, Finite-Lived [Table] us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest TOTAL EQUITY (DEFICIT) Balance Balance Disposal Groups, Including Discontinued Operations [Table] Rental Income [Member] Information related to rental income. us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration Disposal Group, Including Discontinued Operation, Consideration Parent [Member] clpr_PercentOfDistributedDividendsEqualToTaxableReitIncome Percent of Distributed Dividends Equal to Taxable REIT Income Amount of income distributed through dividends. Noncontrolling Interest [Member] Additions to investment in real estate included in accounts payable and accrued liabilities The noncash amount of additions to investment in real estate, included in accounts payable and accrued liabilities. us-gaap_StockholdersEquity Total stockholders’ equity (deficit) Housing Repair and Maintenance Letter Agreement [Member] Relating to the housing repair and maintenance letter agreement. us-gaap_PaymentsOfDividends Dividends and distributions Overhead Charged Related to Office Expenses [Member] Represents information pertaining to overhead charged related to office expenses. Concentration Risk Benchmark [Axis] Nature of Operation, Product Information, Concentration of Risk [Table] Concentration Risk Benchmark [Domain] Residential Segment [Member] Represents residential rental properties segment, a reporting segment of the company. Building and improvements ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] Total revenues TOTAL REVENUES ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag]