Condensed Financial Information of Parent Company Only Disclosure [Abstract] Condensed Financial Statements [Table] Condensed Financial Statements [Table] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Columbia Property Trust (Parent) Parent Company [Member] Columbia Property Trust OP (the Issuer) Subsidiary Issuer [Member] Non- Guarantors Non-Guarantor Subsidiaries [Member] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Reportable Legal Entities Reportable Legal Entities [Member] Consolidating Adjustments Consolidation, Eliminations [Member] Condensed Financial Statements, Captions [Line Items] Condensed Financial Statements, Captions [Line Items] Assets: Assets [Abstract] Real Estate Assets, at Cost: Real Estate Investment Property, at Cost [Abstract] Land Land Buildings and improvements, net Investment Building And Building Improvements , Net Aggregate of the carrying amounts as of the balance sheet date of investments in building and building improvements net of accumulated depreciation Intangible lease assets, net Finite-Lived Intangible Assets, Net Construction in progress Construction in Progress, Gross Real estate assets held for sale, net Real Estate Held-for-sale Total real estate assets Real Estate Investment Property, Net Investment in unconsolidated joint ventures Real Estate Investments, Joint Ventures Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Investment in subsidiaries Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Tenant receivables, net of allowance Accounts and Notes Receivable, Net Straight-line rent receivable Deferred Rent Receivables, Net Prepaid expenses and other assets Prepaid Expense and Other Assets Intangible lease origination costs, net Finite-Lived Intangible Asset, Acquired-in-Place Leases Deferred lease costs, net Deferred Costs, Leasing, Net Investment in development authority bonds Investment in Development Authority Bonds Investments in development authority bonds which were assumed upon acquisition of certain real estate assets and allow for property tax abatement benefits over the term of the agreement. Other assets held for sale, net Disposal Group, Including Discontinued Operation, Assets Total assets Assets Liabilities: Liabilities [Abstract] Line of credit and notes payable, net Long-term Debt Bonds payable, net Unsecured Debt Accounts payable, accrued expenses, and accrued capital expenditures Accounts Payable and Accrued Liabilities Dividends payable Dividends Payable Due to affiliates Due to Related Parties Deferred income Deferred Revenue Intangible lease liabilities, net Off-market Lease, Unfavorable Obligations under capital leases Capital Lease Obligations, Noncurrent Liabilities held for sale, net Disposal Group, Including Discontinued Operation, Liabilities Total liabilities Liabilities Equity: Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract] Total equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total liabilities and equity Liabilities and Equity Income Tax Disclosure [Abstract] GAAP basis financial statement net income attributable to the common stockholders of Columbia Property Trust, Inc. Net Income (Loss) Attributable to Parent Increase (Decrease) in Net Income Resulting From: Increase (Decrease) in Net Income (Loss) [Abstract] Increase (Decrease) in Net Income (Loss) [Abstract] Depreciation and amortization expense for financial reporting purposes in excess of amounts for income tax purposes Tax Basis Net Income (Loss) Reconciliation, Depreciation and Amortization Expense Tax Basis Net Income (Loss) Reconciliation, Depreciation and Amortization Expense Rental income accrued for financial reporting purposes in excess of amounts for income tax purposes Tax Basis Net Income (Loss) Reconciliation, Rental Income Accrued Tax Basis Net Income (Loss) Reconciliation, Rental Income Accrued Net amortization of above-/below-market lease intangibles for financial reporting purposes less than amounts for income tax purposes Tax Basis Net Income (Loss) Reconciliation, Net Amortization of Lease Intangibles Tax Basis Net Income (Loss) Reconciliation, Net Amortization of Lease Intangibles Gain on interest rate swaps that do not qualify for hedge accounting treatment for financial reporting purposes in excess of amounts for income tax purposes Tax Basis Net Income (Loss) Reconciliation, Loss (Gain) Interest Rate Swaps Tax Basis Net Income (Loss) Reconciliation, Loss (Gain) Interest Rate Swaps Bad debt expense for financial reporting purposes less than amounts for income tax purposes Tax Basis Net Income (Loss) Reconciliation, Bad Debt Expense Tax Basis Net Income (Loss) Reconciliation, Bad Debt Expense Income from unconsolidated joint ventures for financial reporting purchases in excess of amount for income tax purposes Tax Basis Net Income (Loss) Reconciliation, Income (Loss) From Unconsolidated Joint Ventures Tax Basis Net Income (Loss) Reconciliation, Income (Loss) From Unconsolidated Joint Ventures Gains or losses on disposition of real property for financial reporting purposes that are more favorable than amounts for income tax purposes Tax Basis Net Income (Loss) Reconciliation, Gains on Sale of Real Property Tax Basis Net Income (Loss) Reconciliation, Gains on Sale of Real Property Other expenses for financial reporting purposes in excess of amounts for income tax purposes Tax Basis Net Income (Loss) Reconciliation, Other Expenses Tax Basis Net Income (Loss) Reconciliation, Other Expenses Income tax basis net income, prior to dividends-paid deduction Net Income (Loss) Attributable to Parent, Tax Basis Net Income (Loss) Attributable to Parent, Tax Basis Tax basis carrying value of total assets Assets Tax Basis Carrying Value Assets Tax Basis Carrying Value Statement of Comprehensive Income [Abstract] Net income Market value adjustment to interest rate swap Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax Settlement of interest rate swap Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Accounting Policies [Abstract] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest Rate Contract Interest Rate Contract [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Prepaid Expenses and Other Assets Prepaid Expenses and Other Assets [Member] Prepaid Expenses and Other Assets [Member] Accounts Payable Accounts Payable [Member] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Derivative, Fair Value, Net [Abstract] Derivative, Fair Value, Net [Abstract] Derivative designated as hedging instruments, interest rate contracts Derivative Instruments in Hedges, at Fair Value, Net Summary of Derivative Instruments Impact on Results of Operations [Abstract] Summary of Derivative Instruments Impact on Results of Operations [Abstract] Market value adjustment to interest rate swaps designated as hedging instruments and included in other comprehensive income Loss on interest rate swap recognized through earnings Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net Summary of Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Statement of Stockholders' Equity [Abstract] Statement Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Statement [Line Items] Statement [Line Items] Distributions to common stockholders (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Revenues: Revenues [Abstract] Rental income Operating Leases, Income Statement, Lease Revenue Tenant reimbursements Tenant Reimbursements Hotel income Revenue from Owned Hotels Asset and property management fee income Property Management Fee Revenue Other property income Other Real Estate Revenue Revenues Revenues Expenses: Operating Expenses [Abstract] Property operating costs Direct Costs of Leased and Rented Property or Equipment Hotel operating costs Direct Costs of Hotels Asset and Property Management Fee Expenses: Investment Advisory, Management and Administrative Fees [Abstract] Related-party Asset And Property Management Fees Related Party The aggregate costs related to asset and property management during the reporting period paid to a related party. Other Owned Property Management Costs Depreciation Depreciation Continuing Operations The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives for continuing operations. Includes production and non-production related depreciation. Amortization Adjustment For Amortization Continuing Operations The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives for continuing operations General and administrative – corporate General and Administrative Expense General and administrative – joint venture General and Administrative Expense, Unconsolidated Joint Venture General and Administrative Expense, Unconsolidated Joint Venture Acquisition expenses Business Combination, Acquisition Related Costs Costs and expenses Operating Expenses Real estate operating income (loss) Operating Income (Loss) Other Income (Expense): Nonoperating Income (Expense) [Abstract] Interest expense Interest Expense Interest and other income Interest and Other Income Loss on interest rate swaps Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Loss on the early extinguishment of debt Gain (Loss) On Extinguishment of Debt Continuing Operations Gain (Loss) On Extinguishment of Debt Continuing Operations Nonoperating income (expense) Nonoperating Income (Expense) Income (loss) before income tax, unconsolidated joint ventures, and gains on sales of real estate assets Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income tax expense Income Tax Expense (Benefit) Income (loss) from unconsolidated joint ventures Income (Loss) from Equity Method Investments Income before gains on sales of real estate assets Income (Loss) from Continuing Operations Before Gain or Loss on Sale of Properties This element is for Real Estate Investment Trust (REIT) statement of income purposes. It represents the income or loss from continuing operations Gains (loss) on sales of real estate assets Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes Net income Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Stock by Class Schedule of Stock by Class [Table] Award Date [Axis] Award Date [Axis] Award Date [Domain] Award Date [Domain] 2017 Grant 1 Twenty-Seventeen Grant 1 [Member] Twenty-Seventeen Grant 1 [Member] 2017 Grant 2 Twenty-Seventeen Grant 2 [Member] Twenty-Seventeen Grant 2 [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Vesting [Axis] Vesting [Axis] Vesting [Domain] Vesting [Domain] Grant date Share-based Compensation Award, Tranche One [Member] 12 months after grant date Share-based Compensation Award, Tranche Two [Member] 24 months after grant date Share-based Compensation Award, Tranche Three [Member] 36 months after grant date Share-based Compensation Award, Tranche Four [Member] Share-based Compensation Award, Tranche Four [Member] 48 months after grant date Share-based Compensation Award, Tranche Five [Member] Share-based Compensation Award, Tranche Five [Member] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Domain] Share Repurchase Program [Domain] 2015 Stock Repurchase Program Twenty-Fifteen Stock Repurchase Program [Member] Twenty-Fifteen Stock Repurchase Program [Member] 2017 Stock Repurchase Program Twenty-Seventeen Stock Repurchase Program [Member] Twenty-Seventeen Stock Repurchase Program [Member] Stock Repurchase Program Stock Repurchase Program [Member] Stock Repurchase Program [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] RSUs Restricted Stock Units (RSUs) [Member] Time-based Stock Awards Time-based Stock Awards [Member] Time-based Stock Awards [Member] Stock Options Employee Stock Option [Member] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Long Term Incentive Plan Long Term Incentive Plan [Member] Long Term Incentive Plan [Member] Director Stock Option Plan Director Stock Option Plan [Member] Director Stock Option Plan [Member] Class of Stock [Line Items] Class of Stock [Line Items] Stock repurchase program, authorized amount Stock Repurchase Program, Authorized Amount Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Number of shares repurchased (in shares) Stock Repurchased During Period, Shares Shares repurchased, average cost per share (in dollars per share) Treasury Stock Acquired, Average Cost Per Share Value of stock repurchased Stock Repurchased During Period, Value Stock repurchase program, amount available for repurchase Stock Repurchase Program, Remaining Authorized Repurchase Amount Shares authorized and reserved under the LTIP Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Granted (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Shares withheld to settle related tax liability Shares Paid for Tax Withholding for Share Based Compensation Award vesting rights (percent) Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Stock units exercisable period after the date of grant Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Performance period Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period Unrecognized compensation costs related to unvested awards Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Unrecognized compensation costs recognition period Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Number of shares granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Shareholder payout (percent) Share-based Compensation Arrangement by Share-based Payment Award, Performance Threshold, Payout Percentage Share-based Compensation Arrangement by Share-based Payment Award, Performance Threshold, Payout Percentage Leases [Abstract] Schedule of Future Minimum Payments Receivable for Operating Leases Schedule of Future Minimum Payments Receivable for Operating Leases [Table Text Block] Tabular disclosure of future minimum income in the aggregate and for each of the five succeeding fiscal years for operating leases Financial Information for Parent Guarantor, Other Guarantor Subsidiaries, and Non-Guarantor Subsidiaries Condensed Financial Information of Parent Company Only Disclosure [Text Block] Business Acquisitions and Dispositions [Abstract] Business Acquisitions and Dispositions Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] 1800 M Street Joint Venture Eighteen Hundred M Street [Member] Eighteen Hundred M Street [Member] 114 Fifth Avenue One Fourteen Fifth Avenue Joint Venture [Member] One Fourteen Fifth Avenue Joint Venture [Member] Related Party Transaction [Axis] Related Party Transaction [Axis] Related Party Transaction [Domain] Related Party Transaction [Domain] Corporate Joint Venture Corporate Joint Venture [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] 149 Madison Avenue One Forty Nine Madison Avenue [Member] One Forty Nine Madison Avenue [Member] 245-249 West 17th Street & 218 West 18th Street Two Forty Five - Two Forty Nine West 17th Street & Two Eighteen West 18th Street [Member] Two Forty Five - Two Forty Nine West 17th Street & Two Eighteen West 18th Street [Member] 229 West 43rd Street TWO HUNDRED TWENTY NINE WEST 43RD STREET [Member] TWO HUNDRED TWENTY NINE WEST 43RD STREET [Member] 116 Huntington Avenue ONE HUNDRED SIXTEEN HUNTINGTON AVENUE [Member] ONE HUNDRED SIXTEEN HUNTINGTON AVENUE [Member] 315 Park Avenue South & 1881 Campus Commons 315 Park Avenue South and 1881 Campus Commons Building [Member] 315 Park Avenue South and 1881 Campus Commons Building Business Acquisition [Line Items] Business Acquisition [Line Items] Ownership percentage Equity Method Investment, Ownership Percentage Purchase price Payments to Acquire Real Estate Purchase price Payments to Acquire Interest in Joint Venture Earnings Per Share [Abstract] Earnings Per Share Earnings Per Share [Text Block] Interests in Properties Acquired Schedule of Business Acquisitions, by Acquisition [Table Text Block] Business Acquisition, Pro Forma Information Business Acquisition, Pro Forma Information [Table Text Block] Schedule of Properties Sold Schedule of Real Estate Properties [Table Text Block] Equity Method Investments and Joint Ventures [Abstract] Summary of Financial Information for the Joint Ventures Equity Method Investments [Table Text Block] Schedule of Basic and Diluted Earnings per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Segment Reporting [Abstract] Segment Information Segment Reporting Disclosure [Text Block] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Intangible lease assets Leases, Acquired-in-Place [Member] Intangible below market ground lease assets Below-Market Lease Assets [Member] Below-Market Lease Assets [Member] Intangible lease origination costs Intangible Lease Origination Costs [Member] Intangible Lease Origination Costs [Member] 245-249 West 17th Street Two Forty Five - Two Forty Nine West 17th Street [Member] Two Forty Five - Two Forty Nine West 17th Street [Member] 218 West 18th Street Two Eighteen West 18th Street [Member] Two Eighteen West 18th Street [Member] 116 Huntington Avenue 116 Huntington Avenue [Member] 116 Huntington Avenue [Member] 315 Park Avenue South THREE HUNDRED FIFTEEN PARK AVENUE SOUTH [Member] THREE HUNDRED FIFTEEN PARK AVENUE SOUTH [Member] 1881 Campus Commons 1881 Campus Commons Building [Member] 1881 Campus Commons Building [Member] Land Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land Building and improvements Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings and Improvements Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings and Improvements Intangible lease assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Intangible below market lease liability Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Below-Market Lease Liability Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Below-Market Lease Liability Total purchase price Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Supplemental Cash Flow Elements [Abstract] Investment in real estate funded with other assets Noncash or Part Noncash Acquisition, Investments Acquired Deposits applied to sales of real estate Escrow Deposits Related to Property Sales Other assets assumed upon acquisition Noncash or Part Noncash Acquisition, Other Assets Acquired Other liabilities assumed upon acquisition Noncash or Part Noncash Acquisition, Other Liabilities Assumed Real estate assets transferred to unconsolidated joint venture Contribution of Property Mortgage note transferred to unconsolidated joint venture Transfer Mortgage Payable Other assets transferred to unconsolidated joint venture Other Assets Transferred to Unconsolidated Joint Venture Other Assets Transferred to Unconsolidated Joint Venture Other liabilities transferred to unconsolidated joint venture Other Liabilities Transferred to Unconsolidated Joint Venture Other Liabilities Transferred to Unconsolidated Joint Venture Discount on issuance of bonds payable Debt Issuance Costs Incurred During Noncash or Partial Noncash Transaction Amortization of discounts (premiums) on debt Amortization of Debt Discount (Premium) Market value adjustment to interest rate swaps that qualify for hedge accounting treatment Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net Accrued capital expenditures and deferred lease costs Other Significant Noncash Transactions, Capital Expenditures Incurred but Not yet Paid and Deferred Leasing Costs, Noncash Other Significant Noncash Transactions, Capital Expenditures Incurred but Not yet Paid and Deferred Leasing Costs, Noncash Accrued dividends payable Common stock issued to employees and directors, and amortized (net of income tax witholdings) Common Stock Issued, Value, Net of Shares for Tax Withholdings Common Stock Issued, Value, Net of Shares for Tax Withholdings Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments Schedule of Long-term Debt Instruments [Table] Interest Rate Swap Interest Rate Swap [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] London Interbank Offered Rate (LIBOR) London Interbank Offered Rate (LIBOR) [Member] Base Rate Base Rate [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Term Loans Notes Payable to Banks [Member] Bridge Loan Bridge Loan [Member] Credit Facilities Line of Credit [Member] Mortgages Mortgages [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] $300 Million Term Loan $300 Million Term Loan, Maturity July 2020 [Member] $300 Million Term Loan, Maturity July 2020 [Member] $300 Million Bridge Loan Three Hundred Million Dollar Bridge Loan, Maturity November 2018 [Member] Three Hundred Million Dollar Bridge Loan, Maturity November 2018 [Member] Revolving Credit Facility JPMorgan Chase Credit Facility [Member] JPMorgan Chase Credit Facility [Member] $150 Million Term Loan $150 Million Term Loan, Maturity July 2022 [Member] $150 Million Term Loan, Maturity July 2022 [Member] 263 Shuman Boulevard Building mortgage note Two-Hundred Sixty-Three Shuman Boulevard Mortgage Note [Member] Two-Hundred Sixty-Three Shuman Boulevard Mortgage Note [Member] One Glenlake Building mortgage note One Glenlake Building Mortgage Note [Member] One Glenlake Building Mortgage Note [Member] 650 California Street Building mortgage note 650 California Street Building Mortgage Note [Member] 650 California Street Building Mortgage Note [Member] 221 Main Building mortgage note 221 Main Street Building Mortgage Note [Member] 221 Main Street Building Mortgage Note [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Debt face amount Debt Instrument, Face Amount Variable rate margin Debt Instrument, Basis Spread on Variable Rate Stated interest rate Debt Instrument, Interest Rate, Stated Percentage Loans payable Loans Payable Effective interest rate Debt Instrument, Interest Rate, Effective Percentage Less: Deferred financing costs related to term loans, bridge loan, and mortgage notes payable Debt Issuance Costs, Net Total indebtedness Notional amount Derivative, Notional Amount Interest expense Interest Expense, Debt Default interest rate Debt Instrument, Interest Rate During Period Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities Cash Flows From Investing Activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Net proceeds from sale of real estate Proceeds from Sale of Real Estate Held-for-investment Including Deposits from Real Estate Dispositions Proceeds from Sale of Real Estate Held-for-investment Including Deposits on Real Estate Acquisitions Investment in real estate and related assets Payments to Acquire and Develop Real Estate and Lease Acquisition Costs Payments to Acquire and Develop Real Estate and Lease Acquisition Costs Investments in unconsolidated joint ventures Distributions in excess of earnings from unconsolidated joint ventures Proceeds from Equity Method Investment, Distribution, Return of Capital Distributions from (Investments in) subsidiaries Payments for (Proceeds from) Businesses and Interest in Affiliates Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Cash Flows From Financing Activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Borrowings, net of fees Proceeds from Notes Payable, Net of Financing Costs Proceeds from Notes Payable, Net of Financing Costs Repayments Repayments of Long-term Debt Prepayments to settle debt and interest rate swap Payments of Debt Extinguishment Costs and Interest Rate Swap Settlement Payments of Debt Extinguishment Costs and Interest Rate Swap Settlement Redemptions of common stock Payments for Repurchase of Common Stock Distributions Distributions Paid to Stockholders for Dividends and Reinvested Shares of Common Stock Distributions Paid to Stockholders for Dividends and Reinvested Shares of Common Stock Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Increase (decrease) in net proceeds from sales of real estate Increase (Decrease) of Proceeds from Sale of Real Estate Held-for-investment Increase (Decrease) of Proceeds from Sale of Real Estate Held-for-investment Increase (decrease) in distributions from subsidiaries Increase (Decrease) in Proceeds from Businesses and Interest in Affiliates Increase (Decrease) in Proceeds from Businesses and Interest in Affiliates Increase (decrease) in borrowings, net of fees Increase (Decrease) in Proceeds from Notes Payable, Net of Financing Costs Increase (Decrease) in Proceeds from Notes Payable, Net of Financing Costs Increase (decrease) in debt repayments Increase (Decrease) in Repayments of Long-term Debt Increase (Decrease) in Repayments of Long-term Debt Increase (decrease) in prepayments to settle debt and interest rate swap Increase (Decrease) in Payments of Debt Extinguishment Costs and Interest Rate Swap Settlement Increase (Decrease) in Payments of Debt Extinguishment Costs and Interest Rate Swap Settlement Increase (decrease) of distributions Increase (Decrease) of Distributions Paid to Stockholders for Dividends and Reinvested Shares of Common Stock Increase (Decrease) of Distributions Paid to Stockholders for Dividends and Reinvested Shares of Common Stock Increase (decrease) in investments in real estate and related assets Increase (Decrease) in Payments to Acquire and Develop Real Estate and Lease Acquisition Costs Increase (Decrease) in Payments to Acquire and Develop Real Estate and Lease Acquisition Costs Increase (decrease) in investments in subsidiaries Increase (Decrease) in Payments to Acquire Interest in Subsidiaries and Affiliates Increase (Decrease) in Payments to Acquire Interest in Subsidiaries and Affiliates Organization, Consolidation and Presentation of Financial Statements [Abstract] Real Estate, Type of Property [Axis] Real Estate, Type of Property [Axis] Real Estate [Domain] Real Estate [Domain] Office Building Office Building [Member] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Real Estate Property Ownership [Axis] Real Estate Property Ownership [Axis] Real Estate Properties [Domain] Real Estate Properties [Domain] Wholly Owned Properties Wholly Owned Properties [Member] Real Estate Real Estate [Abstract] Number of properties Number of Real Estate Properties Square feet of commercial space Area of Real Estate Property Leased office space of owned properties, percent Leased Office Space of Owned Properties, Percent Leased Office Space of Owned Properties, Percent San Francisco Joint Ventures San Francisco Joint Ventures [Member] San Francisco Joint Ventures [Member] Bonds Payable Unsecured Debt [Member] $300 Million Bridge Loan Three Hundred Million Dollar Bridge Loan [Member] Three Hundred Million Dollar Bridge Loan [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Allianz Allianz [Member] Allianz [Member] Blackstone Property Partners Blackstone Property Partners [Member] Blackstone Property Partners [Member] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Disposal Group, Disposed of by Sale, Not Discontinued Operations Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Disposal Group Name [Axis] Disposal Group Name [Axis] Disposal Group Name [Domain] Disposal Group Name [Domain] University Circle & 333 Market Street Three Thirty-Three Market Street Joint Venture and University Circle Joint Venture [Member] Three Thirty-Three Market Street Joint Venture and University Circle Joint Venture [Member] Key Center Tower & Marriot Key Center Tower and Key Center Marriot [Member] Key Center Tower and Key Center Marriot [Member] Houston Properties Houston Properties [Member] Houston Properties [Member] SanTan Corporate Center Santan Corporate Center [Member] Santan Corporate Center [Member] Sterling Commerce Sterling Commerce Property [Member] Sterling Commerce Property [Member] 9127 South Jamaica Street Ninety One Twenty Seven South Jamaica Street [Member] Ninety One Twenty Seven South Jamaica Street [Member] 80 Park Plaza Eighty Park Plaza Building [Member] Eighty Park Plaza Building [Member] 9189, 9191 & 9193 South Jamaica Street South Jamaica Street [Member] South Jamaica Street [Member] 800 North Fredrick Eight Hundred North Fredrick [Member] Eight Hundred North Fredrick [Member] 100 East Pratt One Hundred East Pratt Building [Member] One Hundred East Pratt Building [Member] Market Square Joint Venture Market Square Joint Venture [Member] Market Square Joint Venture [Member] 11 Property Sale Eleven Property Sale [Member] Eleven Property Sale [Member] % Sold Equity Method Investment, Ownership Percentage Sold During Period Equity Method Investment, Ownership Percentage Sold During Period Sales Price Disposal Group, Including Discontinued Operation, Consideration Gain (Loss) on Sale Gains (Losses) on Sales of Investment Real Estate Proceeds from sale of interest in joint venture Proceeds from Divestiture of Interest in Joint Venture Additional ownership percentage acquired Equity Method Investment, Additional Ownership Percentage Acquired Equity Method Investment, Additional Ownership Percentage Acquired Bridge loan Bridge Loan Proceeds from sale of real estate held-for-investment, gross Proceeds from Sale of Real Estate Held-for-investment, Gross Proceeds from Sale of Real Estate Held-for-investment, Gross Note receivable Disposal Group, Including Discontinued Operation, Consideration, Note Receivable Disposal Group, Including Discontinued Operation, Consideration, Note Receivable Term of note receivable Disposal Group, Including Discontinued Operation, Consideration, Note Receivable, Term Disposal Group, Including Discontinued Operation, Consideration, Note Receivable, Term Deferred gain on sale of property Disposal Group, Deferred Gain on Disposal Income (loss) Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Net proceeds from the sale of real estate Proceeds from Sale of Real Estate Held-for-investment Repayments of debt Repayments of Debt Mortgage note transferred to joint venture Real Estate Investments, Joint Ventures, Debt Real Estate Investments, Joint Ventures, Debt Proceeds from sale of real estate Proceeds from Sale of Real Estate Fair market value of property Disposal Group, Including Discontinued Operation, Fair Market Value Of Property Disposal Group, Including Discontinued Operation, Fair Market Value Of Property Income from discontinued operations Disposal Group, Including Discontinued Operation, Operating Income (Loss) Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Operating Segments Operating Segments [Member] Hotel Segment Reconciling Items [Member] Corporate Corporate, Non-Segment [Member] Joint Venture Intersegment Eliminations [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] New York New York Segment [Member] New York Segment San Francisco San Francisco Segment [Member] San Francisco Segment Atlanta Atlanta Segment [Member] Atlanta Segment Washington, D.C. Washington, D.C. Segment [Member] Washington, D.C. Segment Boston Boston Segment [Member] Boston Segment Los Angeles Los Angeles Segment [Member] Los Angeles Segment All other office markets All Other Markets Segment [Member] All Other Markets Segment Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Operating revenues including unconsolidated joint venture Revenues, Including Unconsolidated Joint Venture Revenues, Including Unconsolidated Joint Venture Operating revenues Adjustments for Error Corrections [Axis] Adjustments for Error Corrections [Axis] Adjustments for Error Correction [Domain] Adjustments for Error Correction [Domain] Intercompany Cash Transfers Between Parent and Subsidiaries Broken Out by Cash Flow Type Intercompany Cash Transfers Between Parent and Subsidiaries Broken Out by Cash Flow Type [Member] Intercompany Cash Transfers Between Parent and Subsidiaries Are Now Broken Out by Cash Flow Type [Member] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Restatement Adjustment Restatement Adjustment [Member] Ownership percentage of wholly owned subsidiary Ownership Percentage, Wholly Owned Subsidiary Ownership Percentage, Wholly Owned Subsidiary Increase in cash flows from operating activities Increase (decrease) in cash flows from investing cash flows Increase (decrease) in cash flows from financing activities Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] January 3, 2017 January 03, 2017 [Member] January 03, 2017 [Member] May 2, 2017 May 02, 2017 [Member] May 02, 2017 [Member] November 27, 2017 November 27, 2017 [Member] November 27, 2017 [Member] January 4, 2016 January 04, 2016 [Member] January 04, 2016 [Member] April 1, 2016 April 1, 2016 [Member] April 1, 2016 [Member] July 1, 2016 July 1, 2016 [Member] July 1, 2016 [Member] October 3, 2016 October 3, 2016 [Member] October 3, 2016 [Member] January 2, 2015 January 02, 2015 [Member] January 02, 2015 [Member] April 1, 2015 April 1, 2015 [Member] April 1, 2015 [Member] July 1, 2015 July 1, 2015 [Member] July 1, 2015 [Member] October 1, 2015 October 1, 2015 [Member] October 1, 2015 [Member] Long Term Incentive Plan 2013 Long Term Incentive Plan [Member] 2013 Long Term Incentive Plan [Member] Title of Individual [Axis] Title of Individual [Axis] Relationship to Entity [Domain] Relationship to Entity [Domain] Director Director [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Shares Weighted-Average Grant-Date Fair Value (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Commitments and Contingencies Disclosure [Abstract] Loss Contingencies [Table] Loss Contingencies 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Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Public Float Entity Public Float Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Bonds Payable Bond Disclosure [Text Block] The entire disclosure for information about bonds, including repayment terms, interest rates, collateral provided, whether or not in compliance with covenants, and other matters important to users of the financial statements, such as the effects of refinancing and 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Liabilities held for sale, accumulated amortization Disposal Group, Including Discontinued Operation, Liabilities, Accumulated Amortization Disposal Group, Including Discontinued Operation, Liabilities, Accumulated Amortization Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Equity Stockholders' Equity Note Disclosure [Text Block] Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table] Previously granted LTIP awards, unvested Future LTIP awards 2014 Long Term Incentive Plan [Member] 2014 Long Term Incentive Plan [Member] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Distributions paid on unvested 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Share-based Payment Award, Options, Outstanding [Roll Forward] Outstanding, beginning period (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted (shares) Expired (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Outstanding, period end (shares) Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Outstanding exercise price, beginning period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Outstanding exercise price, period end (in dollars per share) Exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Outstanding shares exercisable, beginning period (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Outstanding shares exercisable, period end (shares) Schedule of Future Minimum Rental Payments for Operating Leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Schedule of Future Minimum Lease Payments for Capital Leases Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block] Real Estate Transactions Business Combination Disclosure [Text Block] Condensed Consolidating Balance Sheets Condensed Balance Sheet [Table Text Block] Consolidating Statements of Operations Condensed Income Statement [Table Text Block] Consolidating Statements Comprehensive Income Comprehensive Income (Loss) [Table Text Block] Consolidating Statements Cash Flows Condensed Cash Flow Statement [Table Text Block] Reconciliation of Revenue from Segments to Consolidated Reconciliation of Revenue from Segments to Consolidated [Table Text Block] Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Income Tax Basis Net Income Reconciliation Schedule of Income Tax Basis Net Income Reconciliation [Table Text Block] Schedule of Income Tax Basis Net Income Reconciliation [Table Text Block] Schedule of Distributions to Common Stockholders Schedule of Distributions to Common Stockholders [Table Text Block] Schedule of Distributions to Common Stockholders [Table Text Block] Schedule of Income Taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Other Significant Noncash Transactions Schedule of Other Significant Noncash Transactions [Table Text Block] Line of Credit and Notes Payable Indebtedness Outstanding (Excluding Bonds Payable) Schedule of Debt [Table Text Block] Aggregate Maturities of Columbia Property Trust's Line of Credit and Notes Payable Schedule of Maturities of Long-term Debt [Table Text Block] Employees Employees [Member] Employees [Member] Stock-based compensation expense Share-based Compensation Future employee awards Deferred Compensation Arrangement with Individual, Compensation Expense L & L Holding Company L & L Holding Company [Member] L & L Holding Company [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Customer concentration risk Customer Concentration Risk [Member] Customer [Axis] Customer [Axis] Customer [Domain] Customer [Domain] Twitter Twitter [Member] Twitter [Member] Room & Board Room & Board [Member] Room & Board [Member] Red Bull North America Red Bull North America [Member] Red Bull North America [Member] Company 3 Company 3 [Member] Company 3 [Member] SY Partners SY Partners [Member] SY Partners [Member] SAE SAE [Member] SAE [Member] Yahoo! Yahoo! [Member] Yahoo! [Member] Snapchat Snapchat [Member] Snapchat [Member] Collective, Inc. Collective, Inc. [Member] Collective, Inc. [Member] MongoDB MongoDB [Member] MongoDB [Member] American Tower American Tower [Member] American Tower [Member] GE Healthcare GE Healthcare [Member] GE Healthcare [Member] Brigham and Women's Brigham and Women's [Member] Brigham and Women's [Member] Credit Suisse Credit Suisse [Member] Credit Suisse [Member] SOS International SOS International [Member] SOS International [Member] Siemens Siemens [Member] Siemens [Member] 229 West 43rd Street 229 West 43rd Street Building [Member] 229 West 43rd Street Building [Member] 315 Park Avenue South Building 315 Park Avenue South Building [Member] 315 Park Avenue South Building [Member] Square feet of space Revenue of acquiree since acquisition date Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Earnings (loss) of acquiree since acquisition date Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Percent leased Lessor, Operating Lease, Percent Leased Lessor, Operating Lease, Percent Leased Payments to acquire real estate Number of tenants Number of Tenants Number of Tenants Concentration risk percentage Concentration Risk, Percentage Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] University Circle Joint Venture University Circle Joint Venture [Member] University Circle Joint Venture [Member] 333 Market Street Joint Venture Three Thirty-Three Market Street Joint Venture [Member] Three Thirty-Three Market Street Joint Venture [Member] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Total Revenues Equity Method Investment, Summarized Financial Information, Revenue Net Income (Loss) Equity Method Investment, Summarized Financial Information, Net Income (Loss) Columbia Property Trust's Share of Net Income (Loss) Income (Loss) from Equity Method Investments, Joint Ventures Income (Loss) from Equity Method Investments, Joint Ventures 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Pronouncement, Early Adoption [Axis] New Accounting Pronouncement, Early Adoption [Axis] New Accounting Principles, Early Adoption [Domain] New Accounting Principles, Early Adoption [Domain] Early adoption Adjustments for New Accounting Principle, Early Adoption [Member] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] ASU 2017-05 Accounting Standards Update 2017-05 [Member] Accounting Standards Update 2017-05 [Member] ASU 2017-01 Accounting Standards Update 2017-01 [Member] Accounting Standards Update 2017-01 [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Interest Expense Interest Expense [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] $450 Million Term Loan Four-Hundred Fifty Million Term Loan [Member] Four-Hundred Fifty Million Term Loan [Member] Name of Property [Axis] Name of Property [Axis] Name of Property [Domain] Name of Property [Domain] 222 East 41st Street Two-Hundred Twenty Two East 41st Street [Member] Two-Hundred Twenty Two East 41st Street [Member] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Building Building [Member] Building and site improvements Building Improvements [Member] Unamortized lease incentives Unamortized Lease Incentives [Member] Unamortized Lease Incentives [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Estimated useful life of assets Property, Plant and Equipment, Useful Life Gross intangible assets Finite-Lived Intangible Assets, Gross Accumulated depreciation of lease assets Amortization of intangible assets Amortization of Intangible Assets Cash equivalent maturity period Cash Equivalent Maturity Period Cash Equivalent Maturity Period Provision for doubtful accounts Provision for Doubtful Accounts Amortization of deferred financing costs Amortization of Debt Issuance Costs Amortization of deferred leasing costs Amortization of Deferred Leasing Fees Amortization of lease incentives Amortization of Lease Incentives Leasehold improvements Lease Incentive, Payable Lease term Lessor, Operating Lease, Term of Contract Reclassified deferred financing costs Preferred stock shares authorized Preferred Stock, Shares Authorized Preferred stock par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Minimum requirement to distribute taxable income (percent) Requirement to Distribute Taxable Income, Percent Requirement to Distribute Taxable Income, Percent Payment to settle interest rate swap Payments for Derivative Instrument, Financing Activities Proceeds from master leases Proceeds from Leases Held-for-investment Limit on investments in taxable real estate investment trusts (percent) Limit on Investments in Taxable Real Estate Investment Trusts, Percent Limit on Investments in Taxable Real Estate Investment Trusts, Percent Cumulative effect of new accounting principle in period of adoption Cumulative Effect of New Accounting Principle in Period of Adoption Transaction costs capitalized Business Acquisition, Transaction Costs Capitalized Business Acquisition, Transaction Costs Capitalized Property management fee revenue and parking agreement revenue Property Management Fee Revenue And Parking Agreement Revenue Property Management Fee Revenue And Parking Agreement Revenue Property management fee revenue and parking agreement revenue as a percentage of total revenue Property Management Fee Revenue And Parking Agreement Revenue, Percentage Of Total Revenue Property Management Fee Revenue And Parking Agreement Revenue, Percentage Of Total Revenue Lease revenue Lease Income Lease revenue as a percentage of total revenue Lease Income, Percentage of Total Revenue Lease Income, Percentage of Total Revenue Revenues Business Acquisition, Pro Forma Revenue Net income Business Acquisition, Pro Forma Net Income (Loss) Net income per share - basic (in dollars per share) Business Acquisition, Pro Forma Earnings Per Share, Basic Net income per share - diluted (in dollars per share) Business Acquisition, Pro Forma Earnings Per Share, Diluted Income Taxes Income Tax Disclosure [Text Block] Schedule of Quarterly Financial Information Quarterly Financial Information [Table Text Block] Buildings and improvements, less accumulated depreciation of $388,796 and $435,457, as of December 31, 2017 and 2016, respectively Intangible lease assets, less accumulated amortization of $94,065 and $112,777, as of December 31, 2017 and 2016, respectively Construction in progress Real estate assets held for sale, less accumulated depreciation and amortization of $180,791 as of December 31, 2016 Tenant receivables, net of allowance for doubtful accounts of $0 and $31 as of December 31, 2017 and 2016, respectively Intangible lease origination costs, less accumulated amortization of $57,465 and $74,578, as of December 31, 2017 and 2016, respectively Deferred lease costs, less accumulated amortization of $26,464 and $22,753, as of December 31, 2017 and 2016, respectively Other assets held for sale, less accumulated amortization of $34,152 as of December 31, 2016 Line of credit and notes payable, net of deferred financing costs of $2,991 and $3,136, as of December 31, 2017 and 2016, respectively Bonds payable, net of discount of $1,484 and $1,664 and deferred financing costs of $4,760 and $5,364, as of December 31, 2017 and 2016, respectively Intangible lease liabilities, less accumulated amortization of $19,660 and $44,564, as of December 31, 2017 and 2016, respectively Liabilities held for sale, less accumulated amortization of $1,239 as of December 31, 2016 Commitments and Contingencies (Note 7) Commitments and Contingencies Common stock, $0.01 par value, 225,000,000 shares authorized, 119,789,106 and 122,184,193 shares issued and outstanding as of December 31, 2017 and 2016, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Cumulative distributions in excess of earnings Accumulated Distributions in Excess of Net Income Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Total equity SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract] Schedule III - Real Estate Assets and Accumulated Depreciation and Amortization SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Text Block] Intangible Lease Assets Finite-Lived Intangible Assets, Net [Abstract] Intangible lease assets, gross Intangible lease origination costs, gross Finite-Lived Intangible Asset, Acquired-in-Place Leases, Gross Finite-Lived Intangible Asset, Acquired-in-Place Leases, Gross Intangible lease assets, accumulated amortization Intangible lease origination costs, accumulated amortization Amortization of intangible lease assets Amortization Intangible Below-Market In-Place Lease Liabilities Below Market Lease, Net [Abstract] Intangible below-market in-place lease liabilities, gross Below Market Lease, Gross Intangible below-market in-place lease liabilities, accumulated amortization Below Market Lease, Accumulated Amortization Amortization of below market lease liabilities Amortization of Below Market Lease Unconsolidated Joint Ventures Equity Method Investments and Joint Ventures Disclosure [Text Block] Real Estate and Accumulated Depreciation, by Property SEC Schedule III, Real Estate and Accumulated Depreciation, by Property [Table] Real Estate and Accumulated Depreciation [Line Items] SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] Real Estate: SEC Schedule III, Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward] Balance at beginning of year SEC Schedule III, Real Estate, Gross Additions to/improvements of real estate SEC Schedule III, Real Estate, Improvements Sale/transfer of real estate SEC Schedule III, Real Estate, Cost of Real Estate Sold Write-offs of building and tenant improvements Real Estate, Write-down or Reserve, Building and Tenant Improvements Real Estate, Write-down or Reserve, Building and Tenant Improvements Write-offs of intangible assets Real Estate, Write-down or Reserve, Intangible Assets Real Estate, Write-down or Reserve, Intangible Assets Write-offs of fully depreciated assets SEC Schedule III, Real Estate, Other Deductions Balance at end of year Accumulated Depreciation and Amortization: SEC Schedule III, Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] Balance at beginning of year SEC Schedule III, Real Estate Accumulated Depreciation Depreciation and amortization expense SEC Schedule III, Real Estate Accumulated Depreciation, Depreciation Expense Sale/transfer of real estate SEC Schedule III, Real Estate Accumulated Depreciation, Real Estate Sold Write-offs of tenant improvements Real Estate Accumulated Depreciation, Other Deductions, Tenant Improvements Real Estate Accumulated Depreciation, Other Deductions, Tenant Improvements Write-offs of intangible assets Real Estate Accumulated Depreciation, Other Deductions, Intangible Assets Real Estate Accumulated Depreciation, Other Deductions, Intangible Assets Write-offs of fully depreciated assets SEC Schedule III, Real Estate Accumulated Depreciation, Other Deductions Balance at end of year Percentage of real estate transferred Equity Method Investment, Percentage of Real Estate Transferred Equity Method Investment, Percentage of Real Estate Transferred Schedule of Related Party Transactions, by Related Party Schedule of Related Party Transactions, by Related Party [Table] Other Property Income Other Income [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Reimbursement of property operating costs Reimbursement Revenue Property management fees due to Columbia Property Trust Property Management Fee Receivable Property Management Fee Receivable University Circle, 333 Market Street Joint Venture,114 Fifth Avenue Joint Venture and 1800 M Street Joint Venture University Circle, 333 Market Street Joint Venture, 114 Fifth Avenue Joint Ventures and 1800 M Street Joint Venture [Member] University Circle, 333 Market Street Joint Venture, 114 Fifth Avenue Joint Ventures and 1800 M Street Joint Venture [Member] Total assets Equity Method Investment, Summarized Financial Information, Assets Total debt Equity Method Investment, Summarized Financial Information, Liabilities Total equity Equity Method Investment Summarized Financial Information, Equity Difference between carrying amount and underlying equity Equity Method Investment, Difference Between Carrying Amount and Underlying Equity Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] South Jamaica Street and 100 East Pratt Buildings South Jamaica Street and 100 East Pratt Buildings [Member] South Jamaica Street and 100 East Pratt Buildings [Member] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Revenues Net income per share - basic (in dollars per share) Earnings Per Share, Basic Net income per share - diluted (in dollars per share) Earnings Per Share, Diluted Dividends declared per share (in dollars per share) Common Stock, Dividends, Per Share, Declared Gain on sale of real estate Gain (loss) on the early extinguishment of debt Early termination payment Gain (Loss) on Contract Termination Ordinary income Distributions To Common Stockholders, Ordinary Income, Percentage For income tax purposes, distributions to common stockholders characterized as ordinary income