Columbia Property Trust (CXP) 10-Q 25 Apr 19 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	Apr. 22, 2019
Document and Entity Information [Abstract]
Entity Registrant Name	COLUMBIA PROPERTY TRUST, INC.
Entity Central Index Key	0001252849
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		116,879,665

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Real estate assets, at cost:
Land	$ 803,986	$ 817,975
Buildings and improvements, less accumulated depreciation of $375,981 and $403,355, as of March 31, 2019 and December 31, 2018, respectively	1,791,926	1,910,041
Intangible lease assets, less accumulated amortization of $74,807 and $84,881, as of March 31, 2019 and December 31, 2018, respectively	64,250	98,540
Construction in progress	37,772	33,800
Real estate assets held for sale, less accumulated depreciation and amortization of $56,948 as of March 31, 2019	145,346	0
Total real estate assets	2,843,280	2,860,356
Operating lease assets	63,829
Investments in unconsolidated joint ventures	1,067,905	1,071,353
Cash and cash equivalents	18,551	17,118
Tenant receivables, net of $4 allowance for doubtful accounts as of December 31, 2018	3,760	3,258
Straight-line rent receivable	83,828	87,159
Prepaid expenses and other assets	31,520	23,218
Intangible lease origination costs, less accumulated amortization of $60,186 and $65,348, as of March 31, 2019 and December 31, 2018, respectively	31,626	34,092
Deferred lease costs, less accumulated amortization of $22,325 and $27,735, as of March 31, 2019 and December 31, 2018, respectively	58,932	77,439
Other assets held for sale, less accumulated amortization of $13,593 as of March 31, 2019	20,498	0
Total assets	4,223,729	4,173,993
Liabilities:
Line of credit and notes payable, net of unamortized deferred financing costs of $2,544 and $2,692, as of March 31, 2019 and December 31, 2018, respectively	680,456	629,308
Bonds payable, net of discounts of $1,259 and $1,304 and unamortized deferred financing costs of $4,005 and $4,158, as of March 31, 2019 and December 31, 2018, respectively	694,736	694,538
Operating lease liabilities	34,738
Accounts payable, accrued expenses, and accrued capital expenditures	37,962	49,117
Dividends payable	0	23,340
Deferred income	16,943	15,593
Intangible lease liabilities, less accumulated amortization of $22,812 and $21,766, as of March 31, 2019 and December 31, 2018, respectively	19,539	21,081
Liabilities held for sale, less accumulated amortization of $380 as of March 31, 2019	20,491	0
Total liabilities	1,504,865	1,432,977
Commitments and Contingencies (Note 7)
Equity:
Common stock, $0.01 par value, 225,000,000 shares authorized, 116,879,665 and 116,698,033 shares issued and outstanding, as of March 31, 2019 and December 31, 2018, respectively	1,169	1,167
Additional paid-in capital	4,420,727	4,421,587
Cumulative distributions in excess of earnings	(1,703,945)	(1,684,082)
Cumulative other comprehensive income	913	2,344
Total equity	2,718,864	2,741,016
Total liabilities and equity	$ 4,223,729	$ 4,173,993

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Building and improvements, accumulated depreciation	$ 375,981	$ 403,355
Intangible lease assets, accumulated amortization	74,807	84,881
Real estate assets held for sale, accumulated amortization	56,948	0
Allowance for doubtful accounts		4
Intangible lease origination costs, accumulated amortization	60,186	65,348
Deferred lease costs, accumulated amortization	22,325	27,735
Other assets held for sale, accumulated amortization	13,593
Deferred financing costs, net	2,544	2,692
Bonds payable discount	1,259	1,304
Intangible lease liabilities, accumulated amortization	22,812	$ 21,766
Liabilities held for sale, accumulated amortization	$ 380
Common stock, par value (dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	225,000,000	225,000,000
Common stock, shares issued	116,879,665	116,698,033
Common stock, shares outstanding	116,879,665	116,698,033
Term Loans
Deferred financing costs, net	$ 2,544	$ 2,692
Bonds Payable
Deferred financing costs, net	$ 4,005	$ 4,158

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues:
Revenues	$ 71,862
Revenues	75,433	$ 73,710
Expenses:
Depreciation	20,404	20,835
Amortization	7,461	8,016
General and administrative – corporate	8,424	7,794
General and administrative – unconsolidated joint ventures	809	731
Costs and expenses	61,590	60,646
Other Income (Expense):
Interest expense	(12,095)	(15,895)
Interest and other income	1	1,803
Gain on sale of unconsolidated joint venture interests	0	762
Income tax expense	(7)	(7)
Gain on sale of real estate assets	1,771	1,771
Nonoperating income (expense)	(10,330)	(11,566)
Net income	$ 3,513	$ 1,498
Per-Share Information – Basic:
Net income (dollars per share)	$ 0.03	$ 0.01
Weighted-average common shares outstanding – basic	116,462	119,082
Per-Share Information – Diluted:
Net income (dollars per share)	$ 0.03	$ 0.01
Weighted-average common shares outstanding – diluted	116,880	119,350
Rental income and tenant reimbursements
Revenues:
Revenues	$ 71,862
Revenues		$ 70,360
Property operating costs
Expenses:
Cost of goods and services sold	24,237	23,062
Asset and property management income/fees
Revenues:
Revenues	1,869	1,759
Expenses:
Cost of goods and services sold	255	208
Other property income
Revenues:
Revenues	$ 1,702	$ 1,591

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 3,513	$ 1,498
Market value adjustments to interest rate swap	(1,431)	2,514
Comprehensive income	$ 2,082	$ 4,012

Consolidated Statements of Equi

Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Cumulative Distributions in Excess of Earnings	Cumulative Other Comprehensive Income (Loss)
Beginning balance, shares at Dec. 31, 2017		119,789,000
Beginning balance, value at Dec. 31, 2017	$ 2,531,936	$ 1,198	$ 4,487,071	$ (1,957,236)	$ 903
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchases of common stock, shares		(1,295,000)
Repurchases of common stock	(27,286)	$ (13)	(27,273)
Common stock issued to employees and directors, and amortized (net of income tax withholdings), shares		108,000
Common stock issued to employees and directors, and amortized (net of income tax withholdings)	(443)	$ 1	(444)
Distributions to common stockholders ($0.20 in 2019 and 2018)	(23,858)			(23,858)
Net income	1,498			1,498
Market value adjustments to interest rate swap	2,514				2,514
Ending balance, shares at Mar. 31, 2018		118,602,000
Ending balance, value at Mar. 31, 2018	2,842,459	$ 1,186	4,459,354	(1,621,498)	3,417
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative-effect adjustment for the adoption of ASU | ASU 2017-05	$ 357,755
Beginning balance, shares at Dec. 31, 2018	116,698,033	116,698,000
Beginning balance, value at Dec. 31, 2018	$ 2,741,016	$ 1,167	4,421,587	(1,684,082)	2,344
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued to employees and directors, and amortized (net of income tax withholdings), shares		182,000
Common stock issued to employees and directors, and amortized (net of income tax withholdings)	(858)	$ 2	(860)
Distributions to common stockholders ($0.20 in 2019 and 2018)	(23,376)			(23,376)
Net income	3,513			3,513
Market value adjustments to interest rate swap	$ (1,431)				(1,431)
Ending balance, shares at Mar. 31, 2019	116,879,665	116,880,000
Ending balance, value at Mar. 31, 2019	$ 2,718,864	$ 1,169	$ 4,420,727	$ (1,703,945)	$ 913
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative-effect adjustment for the adoption of ASU | ASU 2017-05	$ 0

Consolidated Statements of Eq_2

Consolidated Statements of Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Common Stock
Distributions to common stockholders per share (dollars per share)	$ 0.2	$ 0.2

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash Flows From Operating Activities:
Net income	$ 3,513	$ 1,498
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Straight-line rental income	(4,631)	(9,698)
Noncash operating lease expense	212	0
Depreciation	20,404	20,835
Amortization	6,351	7,955
Stock-based compensation expense	1,539	1,528
Noncash interest expense	640	882
Gain on sale of unconsolidated joint venture interests	0	(762)
Income from unconsolidated joint ventures	(1,771)	(1,771)
Distributions of earnings from unconsolidated joint ventures	6,161	8,573
Changes in assets and liabilities, net of acquisitions and dispositions:
Increase in tenant receivables, net	(294)	(829)
Decrease in prepaid expenses and other assets	3,563	4,962
Decrease in accounts payable and accrued expenses	(2,701)	(18,185)
Increase (decrease) in deferred income	2,093	(217)
Net cash provided by operating activities	35,079	14,771
Cash Flows From Investing Activities:
Net proceeds from sale of investments in unconsolidated joint ventures	0	235,083
Prepaid transaction costs and earnest money	(13,701)	0
Capital improvement and development costs	(19,014)	(19,363)
Deferred lease costs paid	(1,937)	(4,514)
Investments in unconsolidated joint ventures	(6,528)	(1,541)
Distributions from unconsolidated joint ventures	5,672	2,976
Net cash provided by (used in) investing activities	(35,508)	212,641
Cash Flows From Financing Activities:
Financing costs paid	(21)	(17)
Proceeds from lines of credit and notes payable	74,000	109,000
Repayments of lines of credit and notes payable	(23,000)	(247,814)
Distributions paid to stockholders	(46,716)	(47,819)
Redemptions of common stock	(2,401)	(29,261)
Net cash provided by (used in) financing activities	1,862	(215,911)
Net increase (decrease) in cash and cash equivalents	1,433	11,501
Cash and cash equivalents, beginning of period	17,118	9,567
Cash and cash equivalents, end of period	$ 18,551	$ 21,068

Organization

Organization	3 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization Columbia Property Trust, Inc. ("Columbia Property Trust") (NYSE: CXP) is a Maryland corporation that operates as a real estate investment trust ("REIT") for federal income tax purposes, and owns and operates commercial real estate properties. Columbia Property Trust conducts business primarily through Columbia Property Trust Operating Partnership, L.P. ("Columbia Property Trust OP"), a Delaware limited partnership in which Columbia Property Trust is the general partner and sole owner. Columbia Property Trust acquires, develops, redevelops, owns, leases, and operates real properties directly, through wholly owned subsidiaries, or through joint ventures. Unless otherwise noted herein, references to Columbia Property Trust, "we," "us," or "our" herein shall include Columbia Property Trust and all subsidiaries of Columbia Property Trust, direct and indirect. As of March 31, 2019 , Columbia Property Trust owned 18 operating properties and two properties under development or redevelopment, of which 14 were wholly owned and six were owned through unconsolidated joint ventures, located primarily in New York, San Francisco, Washington, D.C., and Atlanta. As of March 31, 2019 , the operating properties contained 8.9 million rentable square feet and were approximately 97.1% leased.

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The consolidated financial statements of Columbia Property Trust have been prepared in accordance with the rules and regulations of the U.S. Securities and Exchange Commission ("SEC"), including the instructions to Form 10-Q and Article 10 of Regulation S-X, and do not include all of the information and footnotes required by U.S. generally accepted accounting principles ("GAAP") for complete financial statements. In the opinion of management, the statements for the unaudited interim periods presented include all adjustments, which are of a normal and recurring nature, necessary for a fair and consistent presentation of the results for such periods. Results for these interim periods are not necessarily indicative of a full year's results. For additional information on Columbia Property Trust's unconsolidated joint ventures, which are accounted for using the equity method of accounting, see Note 4, Unconsolidated Joint Ventures . Columbia Property Trust's consolidated financial statements include the accounts of Columbia Property Trust, Columbia Property Trust OP, and any variable-interest entity in which Columbia Property Trust or Columbia Property Trust OP is deemed the primary beneficiary. With respect to entities that are not variable interest entities, Columbia Property Trust's consolidated financial statements also include the accounts of any entity in which Columbia Property Trust, Columbia Property Trust OP, or their subsidiaries own a controlling financial interest and any limited partnership in which Columbia Property Trust, Columbia Property Trust OP, or their subsidiaries own a controlling general partnership interest. All intercompany balances and transactions have been eliminated in consolidation. For further information, refer to the financial statements and footnotes included in Columbia Property Trust's Annual Report on Form 10-K for the year ended December 31, 2018 (the " 2018 Form 10-K"). Fair Value Measurements Columbia Property Trust estimates the fair value of its assets and liabilities (where currently required under GAAP) consistent with the provisions of Accounting Standard Codification 820, Fair Value Measurements ("ASC 820"). Under this standard, fair value is defined as the price that would be received upon sale of an asset or paid upon transfer of a liability in an orderly transaction between market participants at the measurement date, under current market conditions. While various techniques and assumptions can be used to estimate fair value depending on the nature of the asset or liability, the accounting standard for fair value measurements and disclosures provides the following fair value technique parameters and hierarchy, depending upon availability: Level 1 – Assets or liabilities for which the identical term is traded on an active exchange, such as publicly traded instruments or futures contracts. Level 2 – Assets or liabilities valued based on observable market data for similar instruments. Level 3 – Assets or liabilities for which significant valuation assumptions are not readily observable in the market. Such assets or liabilities are valued based on the best available data, some of which may be internally developed. Significant assumptions may include risk premiums that a market participant would consider. Real Estate Assets Columbia Property Trust is required to make subjective assessments as to the useful lives of its depreciable assets. To determine the appropriate useful life of an asset, Columbia Property Trust considers the period of future benefit of the asset. These assessments have a direct impact on net income. The estimated useful lives of its assets by class are as follows: Buildings 40 years Building and site improvements 5-25 years Tenant improvements Shorter of economic life or lease term Intangible lease assets Lease term As further described in Note 5, Line of Credit and Notes Payable , Columbia Property Trust capitalizes interest incurred on outstanding debt balances as well as joint venture investments, as appropriate, during development or redevelopment of real estate held directly or in unconsolidated joint ventures. During both the three months ended March 31, 2019 and 2018 , $0.9 million of interest was capitalized to construction in progress; and during the three months ended March 31, 2019 , $0.3 million was capitalized to investments in unconsolidated joint ventures. Assets Held for Sale Columbia Property Trust classifies properties as held for sale according to Accounting Standard Codification 360, Accounting for the Impairment or Disposal of Long-Lived Assets ("ASC 360"). According to ASC 360, properties having separately identifiable operations and cash flows are considered held for sale when all of the following criteria are met: • Management, having the authority to approve the action, commits to a plan to sell the property. • The property is available for immediate sale in its present condition subject only to terms that are usual and customary for sales of such property. • An active program to locate a buyer and other actions required to complete the plan to sell the property have been initiated. • The property is being actively marketed for sale at a price that is reasonable in relation to its current fair value. • Actions required to complete the plan indicate that it is unlikely that significant changes to the plan will be made or that the plan will be withdrawn. • The sale of the property is probable (i.e., typically subject to a binding sale contract with a non-refundable deposit), and transfer of the property is expected to qualify for recognition as a completed sale within one year. As of March 31, 2019 , One & Three Glenlake Parkway met the criteria to be classified as held for sale in the accompanying balance sheet. The major classes of assets and liabilities classified as held for sale as of March 31, 2019 are provided below (in thousands): March 31, 2019 Real Estate Assets Held for Sale: Real Estate Assets, at Cost: Land $ 13,989 Buildings and improvements, less accumulated depreciation of $46,118 104,030 Intangible lease assets, less accumulated amortization of $10,830 533 Construction in progress 26,794 Total real estate assets held for sale, net $ 145,346 Other Assets Held for Sale: Tenant receivables $ 53 Straight-line rent receivable 7,700 Prepaid expenses and other assets 49 Intangible lease origination costs, less accumulated amortization of $7,109 350 Deferred lease costs, less accumulated amortization of $6,484 12,346 Total other assets held for sale, net $ 20,498 Liabilities Held for Sale: Accounts payable, accrued expenses, and accrued capital expenditures $ 19,632 Deferred income 743 Intangible lease liabilities, less accumulated amortization of $380 116 Total liabilities held for sale, net $ 20,491 Evaluating the Recoverability of Real Estate Assets Columbia Property Trust continually monitors events and changes in circumstances that could indicate that the net carrying amounts of its real estate and related intangible assets and liabilities, of both operating properties and properties under development or redevelopment, may not be recoverable. When indicators of potential impairment are present that suggest that the net carrying amounts of real estate assets and related intangible assets and liabilities may not be recoverable, Columbia Property Trust assesses the recoverability of these net assets by determining whether the respective carrying values will be recovered through the estimated undiscounted future cash flows expected from the use of the net assets and their eventual disposition. In the event that such expected undiscounted future cash flows do not exceed the carrying values, Columbia Property Trust adjusts the carrying values of the real estate assets and related intangible assets and liabilities to the estimated fair values, pursuant to the property, plant, and equipment accounting standard for the impairment or disposal of long-lived assets, and recognizes an impairment loss. At such time that a property is required to be classified as held for sale, its net carrying amount is adjusted to the lower of its depreciated book value or its estimated fair value, less costs to sell, and depreciation is no longer recognized. Estimated fair values are calculated based on the following hierarchy of information: (i) recently quoted market prices, (ii) market prices for comparable properties, or (iii) the present value of future cash flows, including estimated residual value. Projections of expected future operating cash flows require that Columbia Property Trust estimate future market rental income amounts subsequent to the expiration of current lease agreements, property operating expenses, the number of months it takes to re-lease the property, and the number of years the property is held for investment, among other factors. Due to the inherent subjectivity of the assumptions used to project future cash flows, estimated fair values may differ from the values that would be realized in market transactions. Certain of Columbia Property Trust's assets may be carried at an amount that exceeds that which could be realized in a current disposition transaction. Columbia Property Trust has determined that the carrying values of its real estate assets and related intangible assets are recoverable as of March 31, 2019 . Intangible Assets and Liabilities Arising From In-Place Leases Where Columbia Property Trust Is the Lessor Upon the acquisition of real properties, Columbia Property Trust allocates the purchase price of the properties to tangible assets, consisting of land, building, site improvements, and identified intangible assets and liabilities, including the value of in-place leases, based in each case on Columbia Property Trust's estimate of their fair values in accordance with ASC 820 (see "Fair Value Measurements" section above for additional detail). As of March 31, 2019 and December 31, 2018 , Columbia Property Trust had the following intangible assets and liabilities, arising from in-place leases, excluding amounts held for sale, if applicable (in thousands): Intangible Lease Assets Intangible Lease Origination Costs Intangible Below-Market In-Place Lease Liabilities Above-Market In-Place Lease Assets Absorption Period Costs March 31, 2019 Gross $ 3,174 $ 135,883 $ 91,812 $ 42,351 Accumulated Amortization (1,142 ) (73,665 ) (60,186 ) (22,812 ) Net $ 2,032 $ 62,218 $ 31,626 $ 19,539 December 31, 2018 Gross $ 3,174 $ 147,668 $ 99,440 $ 42,847 Accumulated Amortization (1,060 ) (81,220 ) (65,348 ) (21,766 ) Net $ 2,114 $ 66,448 $ 34,092 $ 21,081 For the three months ended March 31, 2019 and 2018 , Columbia Property Trust recognized the following amortization of intangible lease assets and liabilities (in thousands): Intangible Lease Assets Intangible Lease Origination Costs Intangible Below-Market In-Place Lease Liabilities Above-Market In-Place Lease Assets Absorption Period Costs For the Three Months Ended March 31, 2019 $ 82 $ 3,656 $ 2,100 $ 1,426 For the Three Months Ended March 31, 2018 $ 51 $ 4,339 $ 2,419 $ 1,589 The net intangible assets and liabilities remaining as of March 31, 2019 will be amortized as follows, excluding amounts held for sale, if applicable (in thousands): Intangible Lease Assets Intangible Lease Origination Costs Intangible Below-Market In-Place Lease Liabilities Above-Market In-Place Lease Assets Absorption Period Costs For the remainder of 2019 $ 246 $ 10,397 $ 5,963 $ 4,122 For the years ending December 31: 2020 275 12,338 7,406 4,597 2021 247 7,490 3,429 1,714 2022 243 5,848 2,406 1,374 2023 243 5,098 2,165 1,308 2024 230 4,756 2,062 1,162 Thereafter 548 16,291 8,195 5,262 $ 2,032 $ 62,218 $ 31,626 $ 19,539 Interest Rate Swap Agreements Columbia Property Trust enters into interest rate swap contracts to mitigate its interest rate risk on the related financial instruments. Columbia Property Trust does not enter into derivative or interest rate swap transactions for speculative purposes; however, certain of its derivatives may not qualify for hedge accounting treatment. Columbia Property Trust records the fair value of its interest rate swaps on its consolidated balance sheet either as prepaid expenses and other assets or as accounts payable, accrued expenses, and accrued capital expenditures. Changes in the fair value of interest rate swaps that are designated as cash flow hedges are recorded as other comprehensive income. Changes in the fair value of interest rate swaps that do not qualify for hedge accounting treatment are recorded as gain or loss on interest rate swaps. Amounts received or paid under interest rate swap agreements are recorded as interest expense for contracts that qualify for hedge accounting treatment and as gain or loss on interest rate swaps for contracts that do not qualify for hedge accounting treatment. The following tables provide additional information related to Columbia Property Trust's interest rate swaps (in thousands): Estimated Fair Value as of Instrument Type Balance Sheet Classification March 31, December 31, Derivatives designated as hedging instruments: Interest rate contracts Prepaid expenses and other assets $ 913 $ 2,344 Columbia Property Trust applied the provisions of ASC 820 in recording its interest rate swaps at fair value. The fair values of the interest rate swaps, classified under Level 2, were determined using a third-party proprietary model that is based on prevailing market data for contracts with matching durations, current and anticipated London Interbank Offered Rate ("LIBOR") information, and reasonable estimates about relevant future market conditions. Columbia Property Trust has determined that the fair value, as determined by the third party, is reasonable. Three Months Ended 2019 2018 Market value adjustment to interest rate swaps designated as hedging instruments and included in other comprehensive income $ (1,431 ) $ 2,514 During the periods presented, no hedge ineffectiveness was required to be recognized into earnings on the interest rate swaps that qualified for hedge accounting treatment. Income Taxes Columbia Property Trust has elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended (the "Code") and has operated as such beginning with its taxable year ended December 31, 2003. To qualify as a REIT, Columbia Property Trust must meet certain organizational and operational requirements, including a requirement to distribute at least 90% of its REIT taxable income, as defined by the Code, to its stockholders. To the extent that Columbia Property Trust satisfies the distribution requirement but distributes less than 100% of its REIT taxable income, Columbia Property Trust would be subject to federal and state corporate income tax on the undistributed income. Generally, Columbia Property Trust does not incur federal income taxes, other than as described in the following paragraph, because its stockholder distributions typically exceed its taxable income due to noncash expenses such as depreciation. Columbia Property Trust is, however, subject to certain state and local taxes related to the operations of properties in certain locations, which have been provided for in the accompanying consolidated financial statements. Columbia Property Trust TRS, LLC, Columbia KCP TRS, LLC, and Columbia Energy TRS, LLC (collectively, the "TRS Entities") are wholly owned subsidiaries of Columbia Property Trust and are organized as Delaware limited liability companies. The TRS Entities, among other things, provide tenant services that Columbia Property Trust, as a REIT, cannot otherwise provide. Columbia Property Trust has elected to treat the TRS Entities as taxable REIT subsidiaries. Columbia Property Trust may perform certain additional, noncustomary services for tenants of its buildings through the TRS Entities; however, any earnings related to such services are subject to federal and state income taxes. In addition, for Columbia Property Trust to continue to qualify as a REIT, Columbia Property Trust must limit its investments in taxable REIT subsidiaries to 20% of the value of the total assets. The TRS Entities' deferred tax assets and liabilities represent temporary differences between the financial reporting basis and the tax basis of assets and liabilities based on the enacted rates expected to be in effect when the temporary differences reverse. If applicable, Columbia Property Trust records interest and penalties related to uncertain tax positions as general and administrative expense in the accompanying consolidated statements of operations. Reclassification In connection with adopting Accounting Standard Codification ("ASC") 842, Leases ("ASC 842"), effective January 1, 2019, rental income and tenant reimbursements have been combined into a single line on the consolidated statements of operations for all periods presented. See Recent Accounting Pronouncements below for additional details. Recent Accounting Pronouncements Effective January 1, 2019, Columbia Property Trust adopted ASC 842, which amends the lease accounting rules with the following key changes: • Lessees are required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months, and to classify such leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase of the leased asset by the lessee, or not. This classification will determine whether the lease expense is recognized using the effective interest method (finance leases) or on a straight-line basis over the term of the lease (operating leases). • Lessors are required to account for leases using an approach that is substantially similar to the pre-existing rules for operating leases, sales-type leases and direct financing leases, with a few targeted changes, including that: (i) lessors are no longer permitted to capitalize and amortize initial indirect costs incurred to obtain a lease, and (ii) provisions for uncollectible tenant receivables are reflected as a reduction to lease revenues, instead of as general and administrative expense. In connection with transitioning to ASC 842, Columbia Property Trust elected to use certain practical expedients which impact the Company as follows: • Prospective implementation. In-place contracts retain their character as to whether they meet the definition of a lease or not; in-place leases retain their classification as an operating, sales-type, or direct financing lease; and prior-period accounting and presentation is unchanged. • Rental income and tenant reimbursements are combined in a single line on the statements of operations for all periods presented. • Leases with a term of 12 months or less are expensed as incurred, as provided for in a practical expedient elected by Columbia Property Trust. See Note 10, Leases , for additional information. Accounting Standard Update 2018-13 , Fair Value Measurement: Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement ("ASU 2018-13"), which will be effective for Columbia Property Trust on January 1, 2020, expands the disclosure requirements related to a change in fair value technique hierarchy. ASU 2018-13 is not expected to have a material impact on Columbia Property Trust's consolidated financial statements or disclosures.

Real Estate Transactions

Real Estate Transactions	3 Months Ended
	Mar. 31, 2019
Real Estate [Abstract]
Real Estate Transactions	Real Estate Transactions Acquisitions During 2018 , Columbia Property Trust acquired the following properties and partial interests in properties. Columbia Property Trust did not acquire any properties during the three months ended March 31, 2019 . Property Location Date Percent Acquired Purchase Price (1) (in thousands) 2018 799 Broadway New York, NY October 3, 2018 49.7 % $ 30,200 (2) Lindbergh Center – Retail Atlanta, GA October 24, 2018 100.0 % $ 23,000 (1) Exclusive of transaction costs and price adjustments. See purchase price allocation table below for a breakout of the net purchase price for wholly owned properties. (2) Purchase price is for Columbia Property Trust's partial interests in the property, which is owned through an unconsolidated joint venture. 799 Broadway Joint Venture On October 3, 2018, Columbia Property Trust formed a joint venture with Normandy Real Estate Partners ("Normandy") for the purpose of developing a 12-story, 182,000 -square-foot office building at 799 Broadway in New York (the "799 Broadway Joint Venture"). Columbia Property Trust made an initial equity contribution of $30.2 million in the 799 Broadway Joint Venture for a 49.7% interest therein. At inception, the 799 Broadway Joint Venture acquired the property located at 799 Broadway for $145.5 million , exclusive of transaction costs and development costs, and borrowed $97.0 million under a construction loan with total capacity of $187.0 million . Lindbergh Center – Retail On October 24, 2018, Columbia Property Trust acquired the 147,000 square feet of ancillary retail and office space surrounding its existing property, Lindbergh Center, for a gross purchase price of $23.0 million . As of the acquisition date, Lindbergh Center – Retail was 91% leased to 14 tenants, including Pike Nurseries ( 18% ). Purchase Price Allocations for Consolidated Property Acquisitions Lindbergh Center – Retail Location Atlanta, GA Date acquired October 24, 2018 Purchase Price (in thousands): Building and improvements $ 17,558 Intangible lease assets 5,726 Intangible lease origination costs 794 Intangible below market lease liability (715 ) Total purchase price $ 23,363 Note 2, Summary of Significant Accounting Policies , provides a discussion of the estimated useful life for each asset class. Pro Forma Financial Information The following unaudited pro forma statements of operations for the three months ended March 31, 2018 , have been prepared for Columbia Property Trust to give effect to the acquisition of Lindbergh Center – Retail as if the acquisition had occurred on January 1, 2017. Columbia Property Trust owned Lindbergh Center – Retail for the entirety of the three months ended March 31, 2019 . The following unaudited pro forma financial results for Columbia Property Trust have been prepared for informational purposes only and are not necessarily indicative of future results or of actual results that would have been achieved had this acquisition been consummated as of January 1, 2017 (in thousands): Three Months Ended Revenues $ 74,458 Net income $ 1,521 Dispositions 2019 Dispositions One & Three Glenlake Parkway On April 15, 2019, Columbia Property Trust closed on the sale of One & Three Glenlake Parkway for a gross sale price of $227.5 million , and expects to recognize a gain related to the sale in the second quarter of 2019. As described in Note 2, Summary of Significant Accounting Policies , One & Three Glenlake Parkway are classified as held for sale as of March 31, 2019 , on the accompanying consolidated balance sheet. 2018 Dispositions During 2018 , Columbia Property Trust disposed of the following properties, or partial interests in properties of unconsolidated joint ventures: Property Location Date % Sold Sales Price (1) (in thousands) Gain on Sale (in thousands) 222 East 41st Street New York, NY May 29, 2018 100.0 % $ 332,500 $ — 263 Shuman Boulevard Chicago, IL April 13, 2018 100.0 % $ 49,000 $ 24,000 University Circle & San Francisco, CA February 1, 2018 22.5 % $ 235,300 $ 800 (1) Exclusive of transaction costs and price adjustments. 222 East 41st Street On May 29, 2018, Columbia Property Trust closed on the sale of 222 East 41st Street in New York, for $332.5 million , exclusive of transaction costs. Columbia Property Trust recognized an impairment loss of $30.8 million related to this property in the second quarter of 2018, as further described in Note 2, Summary of Significant Accounting Policies . The proceeds from this transaction were used to fully repay the $180.0 million remaining balance on a bridge loan. 263 Shuman Boulevard On April 13, 2018, Columbia Property Trust transferred 263 Shuman Boulevard to the lender, which extinguished the $49.0 million mortgage liability, accrued interest, and accrued property operating costs, and resulted in a $24.0 million gain on extinguishment of debt. University Circle & 333 Market Street Joint Ventures On July 6, 2017, Columbia Property Trust contributed University Circle and 333 Market Street to joint ventures, and simultaneously sold a 22.5% interest in these joint ventures. On February 1, 2018, Columbia Property Trust sold an additional 22.5% interest in University Circle and 333 Market Street to its joint venture partner for $235.3 million , which resulted in a $0.8 million gain on sale of unconsolidated joint venture interests. The gain on sale is calculated as the net sales price over the adjusted carrying value of the joint venture interest sold. Following this transaction, Columbia Property Trust owns a 55.0% interest in the University Circle and 333 Market Street joint ventures. The proceeds from the February 1, 2018 transaction were used to reduce the balance on a bridge loan and the Revolving Credit Facility, as described in Note 5, Line of Credit and Notes Payable .

Unconsolidated Joint Ventures

Unconsolidated Joint Ventures	3 Months Ended
	Mar. 31, 2019
Equity Method Investments and Joint Ventures [Abstract]
Unconsolidated Joint Ventures	Unconsolidated Joint Ventures As of March 31, 2019 and December 31, 2018 , Columbia Property Trust owned interests in the following properties through joint ventures, which are accounted for using the equity method of accounting: Carrying Value of Investment (1) Joint Venture Property Name Geographic Market Ownership Interest March 31, 2019 December 31, 2018 Market Square Joint Venture Market Square Washington, D.C. 51.0 % $ 137,825 $ 134,250 University Circle Joint Venture University Circle San Francisco 55.0 % 291,159 292,951 333 Market Street Joint Venture 333 Market Street San Francisco 55.0 % 272,519 273,783 114 Fifth Avenue Joint Venture 114 Fifth Avenue New York 49.5 % 96,059 99,283 1800 M Street Joint Venture 1800 M Street Washington, D.C. 55.0 % 234,837 237,333 799 Broadway Joint Venture (2) 799 Broadway New York, NY 49.7 % 35,506 33,753 $ 1,067,905 $ 1,071,353 (1) Includes basis differences. (2) Columbia Property Trust capitalized interest of $0.3 million on its investment in the 799 Broadway Joint Venture during the three months ended March 31, 2019 . Columbia Property Trust has determined that none of its unconsolidated joint ventures are variable interest entities. However, Columbia Property Trust and its partners have substantive participation rights in the joint ventures, including management selection and termination, and the approval of operating and capital decisions. As such, Columbia Property Trust uses the equity method of accounting to record its investment in these joint ventures. Under the equity method, the investment in the joint venture is recorded at cost and adjusted for cash contributions and distributions, and allocations of income or loss. Columbia Property Trust evaluates the recoverability of its investments in unconsolidated joint ventures in accordance with accounting standards for equity investments by first reviewing the investment for any indicators of impairment. If indicators are present, Columbia Property Trust estimates the fair value of the investment. If the carrying value of the investment is greater than the estimated fair value, management makes an assessment of whether the deficit is "temporary" or "other-than-temporary," and if other-than-temporary, reduces the carrying value to reflect the estimated fair value by recording an impairment loss. In making this assessment, management considers the following: (1) the length of time and the extent to which fair value has been less than cost and (2) Columbia Property Trust's intent and ability to retain its interest long enough for a recovery in market value. Based on the analysis described above, Columbia Property Trust has determined that none of its investments in joint ventures are impaired as of March 31, 2019 . Condensed Combined Financial Information Summarized balance sheet information for each of the unconsolidated joint ventures is as follows (in thousands): Total Assets Total Debt Total Equity (1) March 31, 2019 December 31, 2018 March 31, 2019 December 31, 2018 March 31, 2019 December 31, 2018 Market Square Joint Venture $ 586,797 $ 582,176 $ 324,775 (2) $ 324,762 $ 248,004 $ 241,581 University Circle Joint Venture 225,398 224,746 — — 218,753 219,390 333 Market Street Joint Venture 372,814 375,884 — — 358,452 360,915 114 Fifth Avenue Joint Venture 498,686 377,970 — — 143,138 149,243 1800 M Street Joint Venture 441,114 447,585 — — 424,501 429,016 799 Broadway Joint Venture 170,075 168,390 98,130 (3) 95,630 69,836 67,189 $ 2,294,884 $ 2,176,751 $ 422,905 $ 420,392 $ 1,462,684 $ 1,467,334 (1) Excludes basis differences. There is an aggregate net difference of $281.2 million and $282.0 million as of March 31, 2019 and December 31, 2018 , respectively, between the historical costs recorded at the joint venture level, and Columbia Property Trust's investments in unconsolidated joint ventures. Such basis differences result from the timing of each partner's joint venture interest acquisition; and formation costs incurred by Columbia Property Trust. Basis differences are amortized to income (loss) from unconsolidated joint ventures over the lives of the underlying assets or liabilities. (2) The Market Square Joint Venture has a $325.0 million mortgage note. The Market Square mortgage note bears interest at 5.07% and matures on July 1, 2023. For a discussion of Columbia Property Trust's guaranty of a portion of this mortgage note, see Note 7, Commitments and Contingencies . (3) Reflects $103.1 million outstanding, net of $5.0 million of net unamortized deferred financing costs, on the 799 Broadway construction loan. The 799 Broadway construction loan is being used to finance a portion of the 799 Broadway development project, has total capacity of $187.0 million and bears interest at LIBOR, capped at 4.00% , plus a spread of 425 basis points (the "Construction Loan"). A portion of the monthly interest payments accrue into the balance of the loan. The Construction Loan matures on October 9, 2021, with two one -year extension options. For a discussion of Columbia Property Trust's equity guaranty related to the Construction Loan, see Note 7, Commitments and Contingencies . Summarized income statement information for the unconsolidated joint ventures for the three months ended March 31, 2019 and 2018 is as follows (in thousands): Total Revenues Net Income (Loss) Columbia Property Trust's Share of Net Income (Loss) (1) 2019 2018 2019 2018 2019 2018 Market Square Joint Venture $ 11,337 $ 11,015 $ (2,595 ) $ (3,009 ) $ (1,323 ) $ (1,534 ) University Circle Joint Venture 11,272 10,341 6,364 5,505 3,500 3,429 333 Market Street Joint Venture 7,054 6,668 3,713 3,557 2,042 2,227 114 Fifth Avenue Joint Venture 10,919 10,300 (2,506 ) (2,331 ) (1,240 ) (1,154 ) 1800 M Street Joint Venture 9,454 8,897 388 243 214 133 799 Broadway Joint Venture — — (526 ) — (262 ) — $ 50,036 $ 47,221 $ 4,838 $ 3,965 $ 2,931 $ 3,101 (1) Excludes amortization of basis differences described in footnote (1) to the above table, which are recorded as income (loss) from unconsolidated joint ventures in the accompanying consolidated statements of operations. Asset and Property Management Fees Columbia Property Trust provides property and asset management services to the Market Square Joint Venture, the University Circle Joint Venture , the 333 Market Street Joint Venture, and the 1800 M Street Joint Venture. Under these agreements, Columbia Property Trust oversees the day-to-day operations of these joint ventures and their properties, including property management, property accounting, and other administrative services. During the three months ended March 31, 2019 and 2018 , Columbia Property Trust earned the following fees from these unconsolidated joint ventures (in thousands): Three Months Ended 2019 2018 Market Square Joint Venture $ 568 $ 523 University Circle Joint Venture 574 529 333 Market Street Joint Venture 207 197 1800 M Street Joint Venture 520 510 $ 1,869 $ 1,759 Columbia Property Trust also received reimbursements of property operating costs of $1.2 million and $1.0 million for the three months ended March 31, 2019 and 2018 , respectively. These reimbursements are included in other property income revenues in the accompanying consolidated statements of operations. Property and asset management fees of $0.6 million and $0.7 million were due to Columbia Property Trust from the joint ventures and are included in prepaid expenses and other assets on the accompanying consolidated balance sheets as of March 31, 2019 and December 31, 2018 , respectively. Additionally, Columbia Property Trust leases office space from the Market Square Joint Venture, and the 799 Broadway Joint Venture leases retail space from Columbia Property Trust. Under these leases, Columbia Property Trust paid $37,000 to the Market Square Joint Venture and received $30,000 from the 799 Broadway Joint Venture, for the three months ended March 31, 2019 .

Line of Credit and Notes Payabl

Line of Credit and Notes Payable	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Line of Credit and Notes Payable	Line of Credit and Notes Payable As of March 31, 2019 and December 31, 2018 , Columbia Property Trust had the following line of credit and notes payable indebtedness (excluding bonds payable; see Note 6, Bonds Payable ) (in thousands): Facility March 31, December 31, Revolving Credit Facility $ 533,000 $ 482,000 $150 Million Term Loan 150,000 150,000 Less: Deferred financing costs related to term loans and notes payable, net of accumulated amortization (2,544 ) (2,692 ) $ 680,456 $ 629,308 On December 7, 2018, Columbia Property Trust amended and restated its $500.0 million revolving credit facility and $300.0 million unsecured term loan (together, the "Credit Agreement"). The Credit Agreement provides for (i) a $650.0 million unsecured revolving credit facility (the "Revolving Credit Facility"), with an initial term ending January 31, 2023 and two six -month extension options (for a total possible extension option of one year to January 31, 2024), subject to the paying of certain fees and the satisfaction of certain other conditions, and (ii) a 12-month, delayed-draw, $300.0 million unsecured term loan, with a term ending January 31, 2024 (the " $300 Million Term Loan"). The $300 Million Term Loan remains undrawn at March 31, 2019 and may be drawn until December 7, 2019. At Columbia Property Trust's option, borrowings under the Credit Agreement bear interest at either (i) the alternate base rate plus an applicable margin based on five stated pricing levels ranging from 0.00% to 0.45% for the Revolving Credit Facility and 0.00% to 0.65% for the $300 Million Term Loan, or (ii) the LIBOR rate, as defined in the credit agreement, plus an applicable margin based on five stated pricing levels ranging from 0.775% to 1.45% for the Revolving Credit Facility and 0.85% to 1.65% for the $300 Million Term Loan, in each case based on the Columbia Property Trust's credit rating. Fair Value of Debt The estimated fair value of Columbia Property Trust's line of credit and notes payable as of March 31, 2019 and December 31, 2018 , was approximately $683.1 million and $632.1 million , respectively. The related carrying value of the line of credit and notes payable as of March 31, 2019 and December 31, 2018 , was $683.0 million and $632.0 million , respectively. Columbia Property Trust estimated the fair value of the $150 Million Term Loan and the Revolving Credit Facility by obtaining estimates for similar facilities from multiple market participants as of the respective reporting dates. Therefore, the fair values determined are considered to be based on observable market data for similar instruments (Level 2). Interest Paid and Capitalized During the three months ended March 31, 2019 and 2018 , Columbia Property Trust made interest payments of approximately $5.6 million and $6.3 million , respectively. Columbia Property Trust capitalizes interest on development, redevelopment, and improvement projects funded directly and through its interest in unconsolidated joint ventures, using the weighted-average interest rate of its consolidated borrowings for the period. During the three months ended March 31, 2019 , Columbia Property Trust capitalized interest of $1.2 million , $0.9 million of which was capitalized to construction in progress, and $0.3 million of which was capitalized to investments in unconsolidated joint ventures. During the three months ended March 31, 2018, Columbia Property Trust capitalized interest of $0.9 million , all of which was capitalized to construction in progress. For the three months ended March 31, 2019 , the weighted average interest rate on Columbia Property Trust’s outstanding borrowings was 3.59% . Debt Covenants As of March 31, 2019 , Columbia Property Trust was in compliance with all of its debt covenants on its term loans and the Revolving Credit Facility.

Bonds Payable

Bonds Payable	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Bonds Payable	Bonds Payable Columbia Property Trust has two series of bonds outstanding as of March 31, 2019 and December 31, 2018 : $350.0 million of 10 -year, unsecured 3.650% senior notes issued at 99.626% of their face value (the "2026 Bonds Payable"); and $350.0 million of 10 -year, unsecured 4.150% senior notes issued at 99.859% of their face value (the "2025 Bonds Payable"), (collectively, the "Bonds Payable"). Both series of bonds require semi-annual interest payments. The principal amount of the 2026 Bonds Payable is due and payable on August 15, 2026, and the principal amount of the 2025 Bonds Payable is due and payable on April 1, 2025. Interest payments of $6.4 million were made on the Bonds Payable during both the three months ended March 31, 2019 and 2018 . Columbia Property Trust is subject to substantially similar covenants under the 2026 Bonds Payable and the 2025 Bonds Payable. As of March 31, 2019 , Columbia Property Trust was in compliance with the restrictive financial covenants on the 2026 Bonds Payable and the 2025 Bonds Payable. As of March 31, 2019 and December 31, 2018 , the estimated fair value of the Bonds Payable was approximately $695.1 million and $685.0 million , respectively, and the related carrying value, net of discounts, as of both March 31, 2019 and December 31, 2018 was $698.7 million . The fair value of the Bonds Payable was estimated based on a discounted cash flow analysis, using observable market data for its bonds payable and similar instruments (Level 2). The discounted cash flow method of assessing fair value results in a general approximation of value, which may differ from the price that could be achieved in a market transaction.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Commitments Under Existing Lease Agreements Certain lease agreements include tenant allowances that, at the option of the tenant, may obligate Columbia Property Trust to expend capital to improve an existing property, or to provide other expenditures for the benefit of the tenant. As of March 31, 2019 , Columbia Property Trust had one individually significant unrecorded tenant allowance commitment: $28.3 million for the WeWork lease at 149 Madison Avenue. These commitments will be accrued as the related costs are incurred. Guaranties of Debt of Unconsolidated Joint Ventures Columbia Property Trust guarantees portions of the debt at two of its unconsolidated joint ventures (see Note 4, Unconsolidated Joint Ventures ). • As of March 31, 2019 , Columbia Property Trust guaranteed $4.0 million of the $325.0 million Market Square mortgage loan. In April 2019, as a result of additional leasing, the guaranty was reduced to $0 and eliminated. • As of March 31, 2019 , the 799 Broadway Joint Venture has $103.1 million in outstanding borrowings on the Construction Loan. Pursuant to a joint and several guaranty agreement with the Construction Loan lender, Columbia Property Trust and its joint venture partner are required to make aggregate additional equity contributions to the joint venture based on the initial expected project costs, less the amount of equity contributions made to date. As of March 31, 2019 , the remaining equity contribution requirement is $47.7 million , of which $23.7 million reflects Columbia Property Trust's allocated share. Equity contributions become payable by Columbia Property Trust to the joint venture when a capital call is received. As of March 31, 2019 , no capital calls remain unpaid; therefore, no liability has been recorded related to this guaranty. Litigation Columbia Property Trust is subject to various legal proceedings, claims, and administrative proceedings arising in the ordinary course of business, some of which are expected to be covered by liability insurance. Management makes assumptions and estimates concerning the likelihood and amount of any reasonably possible loss relating to these matters using the latest information available. Columbia Property Trust records a liability for litigation if an unfavorable outcome is probable, and the amount of loss or range of loss can be reasonably estimated. If an unfavorable outcome is probable and a reasonable estimate of the loss is a range, Columbia Property Trust accrues the best estimate within the range. If no amount within the range is a better estimate than any other amount, Columbia Property Trust accrues the minimum amount within the range. If an unfavorable outcome is probable but the amount of the loss cannot be reasonably estimated, Columbia Property Trust discloses the nature of the litigation and indicates that an estimate of the loss or range of loss cannot be made. If an unfavorable outcome is reasonably possible and the estimated loss is material, Columbia Property Trust discloses the nature and estimate of the possible loss of the litigation. Columbia Property Trust does not disclose information with respect to litigation where the possibility of an unfavorable outcome is considered to be remote. Based on current expectations, such matters, both individually and in the aggregate, are not expected to have a material adverse effect on the liquidity, results of operations, business, or financial condition of Columbia Property Trust. Columbia Property Trust is not currently involved in any legal proceedings of which management would consider the outcome to be reasonably likely to have a material adverse effect on the results of operations, liquidity, or financial condition of Columbia Property Trust.

Stockholders' Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity Common Stock Repurchase Program Columbia Property Trust's board of directors authorized a stock repurchase program to purchase up to an aggregate of $200.0 million of its common stock, par value $0.01 per share, from September 4, 2017 through September 4, 2019 (the "2017 Stock Repurchase Program"). During the three months ended March 31, 2019 , Columbia Property Trust did not make any share repurchases. As of March 31, 2019 , $124.4 million remains available for repurchases under the 2017 Stock Repurchase Program. Common stock repurchases are charged against equity as incurred, and the repurchased shares are retired. Columbia Property Trust will continue to evaluate the purchase of shares, primarily through open market transactions, which are subject to market conditions and other factors. Long-Term Incentive Compensation Columbia Property Trust maintains a stockholder-approved, long-term incentive plan (the "LTI Plan") that provides for grants of up to 4.8 million shares of stock to be made to certain employees and independent directors of Columbia Property Trust. Employee Awards Under the LTI Plan, Columbia Property Trust grants time-based stock awards and performance-based restricted stock unit awards to its employees. On January 1, 2019, Columbia Property Trust granted 175,129 shares of stock awards (the "Time-Based Restricted Shares") to employees, which will vest ratably on each anniversary of the grant over the next four years. On January 1, 2019, Columbia Property Trust granted 221,199 of performance-based restricted stock units (the "Performance-Based RSUs"), of which 75% will vest at the conclusion of a three -year performance period, and the remaining 25% will vest one year later. The payout of the 2019 Performance-Based RSUs will be determined based on Columbia Property Trust's total stockholder return relative to the FTSE NAREIT Equity Office Index. Below is a summary of the employee awards issued under the LTI Plan in the three months ended March 31, 2019 : Time-Based Awards Performance-Based Awards Restricted Shares Weighted-Average (1) RSUs (in thousands) Weighted-Average (2) Unvested awards – beginning of period 375 $ 22.15 454 $ 19.37 Granted 175 $ 19.35 256 (3) $ 17.66 Vested (165 ) $ 21.98 (121 ) $ 19.08 Forfeited — $ — — $ — Unvested awards – end of period (4) 385 $ 20.95 589 $ 18.77 (1) Reflects the weighted-average, grant-date fair value using the market closing price on the date of the respective grants. (2) Reflects the weighted-average, grant-date fair value using a Monte Carlo valuation. (3) Includes approximately 35,000 RSUs, which were converted to shares based on performance, as defined by the LTI Plan, over the period from January 1, 2017 through December 31, 2018. (4) As of March 31, 2019 , Columbia Property Trust expects approximately 370,000 of the 385,000 unvested restricted stock units to ultimately vest and approximately 566,000 of the 589,000 unvested Performance-Based RSUs, assuming a weighted-average forfeiture rate of 3.8% , which was determined based on historical forfeiture rates. Director Stock Grants Columbia Property Trust grants equity retainers to its directors under the LTI Plan. Such grants vest immediately. Beginning in May 2017, these grants are made annually for the following year. For the three months ended March 31, 2018 and 2019, no stock grants were made to the directors. Stock-Based Compensation Expense For the three months ended March 31, 2019 and 2018 , Columbia Property Trust incurred stock-based compensation expense related to the following events (in thousands): Three Months Ended 2019 2018 Amortization of time-based awards granted under the LTI Plan $ 884 $ 1,036 Amortization of performance-based awards granted under the LTI Plan (1) 655 492 Total stock-based compensation expense $ 1,539 $ 1,528 (1) Reflects amortization of awards made under the LTI Plan for service during the current period, for which shares will be issued in future periods. These expenses are included in general and administrative expenses – corporate in the accompanying consolidated statements of operations. As of March 31, 2019 and December 31, 2018 , there were $13.6 million and $8.6 million , respectively, of unrecognized compensation costs related to unvested awards under the LTI Plan, which will be amortized over the respective vesting period, ranging from one to four years at the time of grant.

Supplemental Disclosures of Non

Supplemental Disclosures of Noncash Investing and Financing Activities	3 Months Ended
	Mar. 31, 2019
Supplemental Cash Flow Elements [Abstract]
Supplemental Disclosures of Noncash Investing and Financing Activities	Supplemental Disclosures of Noncash Investing and Financing Activities Outlined below are significant noncash investing and financing activities for the three months ended March 31, 2019 and 2018 (in thousands): Three Months Ended 2019 2018 Amortization of net discounts on debt $ 45 $ 45 Accrued investments in unconsolidated joint ventures $ 88 $ — Accrued capital expenditures and deferred lease costs $ 19,603 $ 12,414 Operating lease liability recorded at adoption of ASC 842 $ 34,791 $ — Market value adjustments to interest rate swaps that qualify for hedge accounting treatment $ (1,431 ) $ 2,514 Cumulative-effect adjustment to equity for the adoption of ASU 2017-05, Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Non-Financial Assets $ — $ 357,755 Amortization of common stock issued to employees and directors $ 1,539 $ 1,528

Leases

Leases	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Leases	Leases Columbia Property Trust as Lessee Columbia Property Trust is a lessee on ground leases at certain of its investment properties, office space leases, and various information technology equipment leases. Operating lease assets represent Columbia Property Trust's right to use the underlying asset over the lease term, and operating lease liabilities represent Columbia Property Trust's obligation to make lease payments over the lease term. Operating lease liabilities are measured as the present value of lease payments over the lease term. As most of Columbia Property Trust's leases do not provide an implicit rate, Columbia Property Trust uses its incremental borrowing rate, based on information available at commencement, to calculate the present value of lease payments. Lease term extensions are included in the operating lease liability when it is reasonably certain that they will be exercised. Any variable payments for non-lease services provided under leases are expensed as incurred. Operating lease assets are measured based on the corresponding operating lease liability amount, reduced for lease incentives and straight-line rent payable (receivable) balances at adoption of ASC 842. Operating lease expense is recognized on a straight-line basis over the lease term, and is reflected as property operating costs for ground leases and as general and administrative – corporate for all other operating leases. Contracts are evaluated at commencement to determine if the contract contains a lease, and the appropriate classification for such leases. As of March 31, 2019, Columbia Property Trust has three ground leases with remaining lease terms ranging from 58 years to 111 years, inclusive of renewal options, which are included in operating lease assets of $63.8 million . Under one of the ground leases, payments for all future periods have already been made. Thus, as of March 31, 2019, operating lease liabilities of $34.7 million reflect the present value of future payments due under the other two ground leases, which have remaining lease terms ranging from 80 years to 111 years, inclusive of renewal options. As of March 31, 2019, the future minimum lease payments to be made by Columbia Property Trust under its operating leases are as follows (thousands): Remainder of 2019 $ 1,877 2020 2,539 2021 2,704 2022 2,743 2023 2,023 2024 1,962 Thereafter 174,821 Total lease payments 188,669 Less: interest expense (153,931 ) Present value of lease liabilities $ 34,738 Weighted-average remaining lease term (years) 76 years Weighted-average discount rate 6.6 % As of December 31, 2018 , the future minimum lease payments to be made by Columbia Property Trust under its operating leases are as follows (in thousands): 2019 $ 2,502 2020 2,539 2021 2,704 2022 2,743 2023 2,023 Thereafter 176,782 Total $ 189,293 Columbia Property Trust's operating leases had the following impacts on the consolidated balance sheet as of March 31, 2019 (in thousands): Ground Leases Office Lease Total Operating Leases Assets: Total operating lease assets $ 61,849 $ 1,980 $ 63,829 Liabilities: Total operating lease liabilities $ 32,112 $ 2,626 $ 34,738 Columbia Property Trust's operating leases had the following impacts on the consolidated statements of operations for the three months ended March 31, 2019 (in thousands): Ground Leases Office Lease Total Operating Leases Property operating costs $ 692 $ — $ 692 General and administrative – corporate — 145 145 Total operating lease expenses $ 692 $ 145 $ 837 Columbia Property Trust's operating leases had the following impacts on the consolidated statements of cash flows for the three months ended March 31, 2019: Ground Leases Office Lease Total Operating Leases Cash paid for operating lease liabilities included in cash flows from operations $ (451 ) $ (174 ) $ (625 ) Columbia Property Trust as Lessor Columbia Property Trust owns and leases commercial real estate, primarily office space, to tenants under operating leases for specified periods of time. Some of Columbia Property Trust's leases contain extension and/or termination options; however, the exercise of these extensions or terminations is at the discretion of the tenant and subject to negotiations. Therefore, such options are only recognized once they are deemed reasonably certain, typically at the time the option is exercised. Rental income related to such leases is recognized on a straight-line basis over the remaining lease period, and is included in rental income and tenant reimbursements on the consolidated statements of operations. Contracts are evaluated at commencement to determine if the contract contains a lease, and the appropriate classification for such leases. As of March 31, 2019, the weighted-average remaining term for such leases is approximately 6.9 years . Rental income and tenant reimbursements include fixed and variable payments. Fixed payments primarily relate to base rent; and variable payments primarily relate to tenant reimbursements for certain property operating costs. Fixed and variable payments for the three months ended March 31, 2019 are as follows (in thousands): Three Months Ended March 31, 2019 Fixed payments $ 65,517 Variable payments 6,345 Total rental income and tenant reimbursements $ 71,862 As of March 31, 2019, the future minimum lease payments due to Columbia Property Trust under non-cancelable operating leases are as follows (thousands): Remainder of 2019 $ 184,860 2020 251,836 2021 225,294 2022 213,492 2023 196,011 2024 183,205 Thereafter 939,626 Total $ 2,194,324 As of December 31, 2018 , the future minimum lease payments due to Columbia Property Trust under non-cancelable operating leases are as follows (in thousands): 2019 $ 242,370 2020 247,826 2021 221,692 2022 209,845 2023 192,261 Thereafter 1,106,275 Total $ 2,220,269
Leases	Leases Columbia Property Trust as Lessee Columbia Property Trust is a lessee on ground leases at certain of its investment properties, office space leases, and various information technology equipment leases. Operating lease assets represent Columbia Property Trust's right to use the underlying asset over the lease term, and operating lease liabilities represent Columbia Property Trust's obligation to make lease payments over the lease term. Operating lease liabilities are measured as the present value of lease payments over the lease term. As most of Columbia Property Trust's leases do not provide an implicit rate, Columbia Property Trust uses its incremental borrowing rate, based on information available at commencement, to calculate the present value of lease payments. Lease term extensions are included in the operating lease liability when it is reasonably certain that they will be exercised. Any variable payments for non-lease services provided under leases are expensed as incurred. Operating lease assets are measured based on the corresponding operating lease liability amount, reduced for lease incentives and straight-line rent payable (receivable) balances at adoption of ASC 842. Operating lease expense is recognized on a straight-line basis over the lease term, and is reflected as property operating costs for ground leases and as general and administrative – corporate for all other operating leases. Contracts are evaluated at commencement to determine if the contract contains a lease, and the appropriate classification for such leases. As of March 31, 2019, Columbia Property Trust has three ground leases with remaining lease terms ranging from 58 years to 111 years, inclusive of renewal options, which are included in operating lease assets of $63.8 million . Under one of the ground leases, payments for all future periods have already been made. Thus, as of March 31, 2019, operating lease liabilities of $34.7 million reflect the present value of future payments due under the other two ground leases, which have remaining lease terms ranging from 80 years to 111 years, inclusive of renewal options. As of March 31, 2019, the future minimum lease payments to be made by Columbia Property Trust under its operating leases are as follows (thousands): Remainder of 2019 $ 1,877 2020 2,539 2021 2,704 2022 2,743 2023 2,023 2024 1,962 Thereafter 174,821 Total lease payments 188,669 Less: interest expense (153,931 ) Present value of lease liabilities $ 34,738 Weighted-average remaining lease term (years) 76 years Weighted-average discount rate 6.6 % As of December 31, 2018 , the future minimum lease payments to be made by Columbia Property Trust under its operating leases are as follows (in thousands): 2019 $ 2,502 2020 2,539 2021 2,704 2022 2,743 2023 2,023 Thereafter 176,782 Total $ 189,293 Columbia Property Trust's operating leases had the following impacts on the consolidated balance sheet as of March 31, 2019 (in thousands): Ground Leases Office Lease Total Operating Leases Assets: Total operating lease assets $ 61,849 $ 1,980 $ 63,829 Liabilities: Total operating lease liabilities $ 32,112 $ 2,626 $ 34,738 Columbia Property Trust's operating leases had the following impacts on the consolidated statements of operations for the three months ended March 31, 2019 (in thousands): Ground Leases Office Lease Total Operating Leases Property operating costs $ 692 $ — $ 692 General and administrative – corporate — 145 145 Total operating lease expenses $ 692 $ 145 $ 837 Columbia Property Trust's operating leases had the following impacts on the consolidated statements of cash flows for the three months ended March 31, 2019: Ground Leases Office Lease Total Operating Leases Cash paid for operating lease liabilities included in cash flows from operations $ (451 ) $ (174 ) $ (625 ) Columbia Property Trust as Lessor Columbia Property Trust owns and leases commercial real estate, primarily office space, to tenants under operating leases for specified periods of time. Some of Columbia Property Trust's leases contain extension and/or termination options; however, the exercise of these extensions or terminations is at the discretion of the tenant and subject to negotiations. Therefore, such options are only recognized once they are deemed reasonably certain, typically at the time the option is exercised. Rental income related to such leases is recognized on a straight-line basis over the remaining lease period, and is included in rental income and tenant reimbursements on the consolidated statements of operations. Contracts are evaluated at commencement to determine if the contract contains a lease, and the appropriate classification for such leases. As of March 31, 2019, the weighted-average remaining term for such leases is approximately 6.9 years . Rental income and tenant reimbursements include fixed and variable payments. Fixed payments primarily relate to base rent; and variable payments primarily relate to tenant reimbursements for certain property operating costs. Fixed and variable payments for the three months ended March 31, 2019 are as follows (in thousands): Three Months Ended March 31, 2019 Fixed payments $ 65,517 Variable payments 6,345 Total rental income and tenant reimbursements $ 71,862 As of March 31, 2019, the future minimum lease payments due to Columbia Property Trust under non-cancelable operating leases are as follows (thousands): Remainder of 2019 $ 184,860 2020 251,836 2021 225,294 2022 213,492 2023 196,011 2024 183,205 Thereafter 939,626 Total $ 2,194,324 As of December 31, 2018 , the future minimum lease payments due to Columbia Property Trust under non-cancelable operating leases are as follows (in thousands): 2019 $ 242,370 2020 247,826 2021 221,692 2022 209,845 2023 192,261 Thereafter 1,106,275 Total $ 2,220,269

Non-Lease Revenues

Non-Lease Revenues	3 Months Ended
	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Non-Lease Revenues	Non-Lease Revenues Columbia Property Trust derives most of its revenues from leases, as described in Note 10, Leases . Columbia Property Trust also has the following non-lease revenue streams. Asset and Property Management Fee Income Under asset and property management agreements in place with certain of its unconsolidated joint ventures, Columbia Property Trust earns revenue for performing asset and property management functions for properties owned through its joint ventures, as further described in Note 4, Unconsolidated Joint Ventures . For the three months ended March 31, 2019 and 2018 , Columbia Property Trust earned revenues of $1.9 million and $1.8 million , respectively, under these agreements. Leasing Override Fees Under the asset management agreements for certain properties owned through unconsolidated joint ventures, Columbia Property Trust is eligible to earn leasing override fees equal to a percentage of the total rental payments to be made by the tenant over the term of the lease. For the three months ended March 31, 2019 , Columbia Property Trust earned leasing override fees of $3,000 , which are included in asset and property management fee income on the accompanying consolidated statements of operations. Salary and Other Reimbursement Revenue Under the property management agreements for certain properties owned through unconsolidated joint ventures, Columbia Property Trust receives reimbursements for salaries and property operating costs for services that are provided by Columbia Property Trust employees on an ongoing basis. For the three months ended March 31, 2019 and 2018 , Columbia Property Trust earned salary and other reimbursement revenue of $1.1 million and $1.0 million , respectively, which is included in other property income on the accompanying consolidated statements of income. Miscellaneous Revenue Columbia Property Trust also receives revenues for services provided to its tenants through the TRS Entities, including fitness centers, shuttles, and cafeterias, which are included in other property income on the accompanying consolidated statements of income. For both the three months ended March 31, 2019 and 2018 , Columbia Property Trust earned miscellaneous revenue of $0.2 million , which is included in other property income on the accompanying consolidated statements of income.

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share For the three months ended March 31, 2019 and 2018 , in computing the basic and diluted earnings per share, net income has been reduced for the dividends paid on unvested shares granted under the LTI Plan. The following table reconciles the numerator for the basic and diluted earnings-per-share computations shown on the consolidated statements of operations for the three months ended March 31, 2019 and 2018 (in thousands): Three Months Ended 2019 2018 Net income $ 3,513 $ 1,498 Distributions paid on unvested shares (77 ) (73 ) Net income used to calculate basic and diluted earnings per share $ 3,436 $ 1,425 The following table reconciles the denominator for the basic and diluted earnings-per-share computations shown on the consolidated statements of operations for the three months ended March 31, 2019 and 2018 , respectively (in thousands): Three Months Ended 2019 2018 Weighted-average common shares – basic 116,462 119,082 Plus incremental weighted-average shares from time-vested conversions, less assumed stock repurchases: Previously granted awards, unvested 90 70 Future period LTI Plan awards 328 198 Weighted-average common shares – diluted 116,880 119,350

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Segment Information	Segment Information Columbia Property Trust establishes operating segments at the property level and aggregates individual properties into reportable segments for high-barrier-to-entry markets and other geographic locations in which Columbia Property Trust has significant investments. Columbia Property Trust considers geographic location when evaluating its portfolio composition and in assessing the ongoing operations and performance of its properties. As of March 31, 2019 , Columbia Property Trust had the following reportable segments: New York, San Francisco, Atlanta, Washington, D.C., Boston, Los Angeles, and all other office markets. The all other office markets reportable segment consists of properties in similar low-barrier-to-entry geographic locations in which Columbia Property Trust does not have a substantial presence and does not plan to make further investments. During the periods presented, there have been no material intersegment transactions. Net operating income ("NOI") is a non-GAAP financial measure. NOI is the primary performance measure reviewed by management to assess operating performance of properties and is calculated by deducting operating expenses from operating revenues. Operating revenues include rental income, tenant reimbursements, and other property income; and operating expenses include property operating costs. The NOI performance metric consists only of revenues and expenses directly related to real estate rental operations. NOI reflects property acquisitions and dispositions, occupancy levels, rental rate increases or decreases, and the recoverability of operating expenses. NOI, as Columbia Property Trust calculates it, may not be directly comparable to similarly titled, but differently calculated, measures for other REITs. Asset information and capital expenditures by segment are not reported because Columbia Property Trust does not use these measures to assess performance. Depreciation and amortization expense, along with other expense and income items, are not allocated among segments. The following table presents operating revenues included in NOI by geographic reportable segment for Columbia Property Trust's respective ownership interests (in thousands): Three Months Ended March 31, 2019 2018 New York (1) $ 38,696 $ 40,909 San Francisco (2) 27,763 23,520 Atlanta 11,223 9,858 Washington, D.C. (3) 14,130 13,972 Boston 3,674 3,370 Los Angeles 1,934 1,920 All other office markets 3,903 3,936 Total office segments 101,323 97,485 Corporate 786 681 Total operating revenues $ 102,109 $ 98,166 (1) Includes operating revenues for one unconsolidated property, 114 Fifth Avenue, based on Columbia Property Trust's ownership interest: 49.5% for all periods presented. (2) Includes operating revenues for two unconsolidated properties, 333 Market Street and University Circle, based on Columbia Property Trust's ownership interests: 77.5% from January 1, 2018 through January 31, 2018; and 55.0% from February 1, 2018 through March 31, 2019. (3) Includes operating revenues for two unconsolidated properties, Market Square and 1800 M Street, based on Columbia Property Trust's ownership interests: 51.0% for the Market Square and 55.0% for 1800 M Street for all periods presented. A reconciliation of GAAP revenues to operating revenues is presented below (in thousands): Three Months Ended March 31, 2019 2018 Total revenues $ 75,433 $ 73,710 Operating revenues included in income from unconsolidated joint ventures (1) 28,545 26,215 Less: asset and property management fee income (2) (1,869 ) (1,759 ) Total operating revenues $ 102,109 $ 98,166 (1) Columbia Property Trust records its interest in properties held through unconsolidated joint ventures using the equity method of accounting, and reflects its interest in the operating revenues of these properties in income from unconsolidated joint ventures in the accompanying consolidated statements of operations. (2) See Note 11, Non-Lease Revenues , of the accompanying consolidated financial statements. The following table presents NOI by geographic reportable segment (in thousands): Three Months Ended March 31, 2019 2018 New York (1) $ 22,806 $ 24,179 San Francisco (2) 20,497 19,554 Atlanta 8,151 8,754 Washington, D.C. (3) 8,453 8,330 Boston 1,989 1,768 Los Angeles 1,119 1,208 All other office markets 3,836 3,291 Total office segments 66,851 67,084 Corporate (205 ) (225 ) Total NOI $ 66,646 $ 66,859 (1) Includes NOI for two unconsolidated properties, 114 Fifth Avenue and 799 Broadway, based on Columbia Property Trust's ownership interest: 49.5% for 114 Fifth Avenue for all periods presented; and 49.7% for 799 Broadway from October 3, 2018 through March 31, 2019. (2) Includes NOI for two unconsolidated properties, 333 Market Street and University Circle, based on Columbia Property Trust's ownership interests: 77.5% from January 1, 2018 through January 31, 2018; and 55.0% from February 1, 2018 through March 31, 2019. (3) Includes NOI for two unconsolidated properties, Market Square and 1800 M Street, based on Columbia Property Trust's ownership interests: 51.0% for the Market Square and 55.0% for 1800 M Street for all periods presented. A reconciliation of GAAP net income to NOI is presented below (in thousands): Three Months Ended March 31, 2019 2018 Net income $ 3,513 $ 1,498 Depreciation 20,404 20,835 Amortization 7,461 8,016 General and administrative – corporate 8,424 7,794 General and administrative – unconsolidated joint ventures 809 731 Net interest expense 12,094 15,892 Interest income from development authority bonds — (1,800 ) Gain on sale of unconsolidated joint venture interests — (762 ) Income tax expense 7 7 Asset and property management fee income (1,869 ) (1,759 ) Adjustments included in income from unconsolidated joint ventures 15,803 16,407 NOI $ 66,646 $ 66,859

Financial Information for Paren

Financial Information for Parent Guarantor, Issuer Subsidiary, and Non-Guarantor Subsidiaries	3 Months Ended
	Mar. 31, 2019
Condensed Financial Information Disclosure [Abstract]
Financial Information for Parent Guarantor, Issuer Subsidiary, and Non-Guarantor Subsidiaries	Financial Information for Parent Guarantor, Issuer Subsidiary, and Non-Guarantor Subsidiaries The 2026 Bonds Payable and the 2025 Bonds Payable (see Note 6, Bonds Payable ) were issued by Columbia Property Trust OP, and are guaranteed by Columbia Property Trust. In accordance with SEC Rule 3-10(c), Columbia Property Trust includes herein condensed consolidating financial information in lieu of separate financial statements of the subsidiary issuer (Columbia Property Trust OP), as defined in the bond indentures, because all of the following criteria are met: (1) The subsidiary issuer (Columbia Property Trust OP) is 100% owned by the parent company guarantor (Columbia Property Trust); (2) The guarantee is full and unconditional; and (3) No other subsidiary of the parent company guarantor (Columbia Property Trust) guarantees the 2026 Bonds Payable or the 2025 Bonds Payable. Columbia Property Trust uses the equity method with respect to its investment in subsidiaries included in its consolidated financial statements. Set forth below are Columbia Property Trust's condensed consolidating balance sheets as of March 31, 2019 and December 31, 2018 , as well as its condensed consolidating statements of operations, its condensed consolidating statements of comprehensive income, and its condensed consolidating statements of cash flows for the three months ended March 31, 2019 and 2018 . Condensed Consolidating Balance Sheets (in thousands): As of March 31, 2019 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Assets: Real estate assets, at cost: Land $ — $ — $ 803,986 $ — $ 803,986 Buildings and improvements, net — 1,633 1,790,293 — 1,791,926 Intangible lease assets, net — — 64,250 — 64,250 Construction in progress — — 37,772 — 37,772 Real estate assets held for sale, net — — 145,346 — 145,346 Total real estate assets — 1,633 2,841,647 — 2,843,280 Operating lease assets 1,980 — 61,849 — 63,829 Investments in unconsolidated joint ventures — 1,067,905 — — 1,067,905 Cash and cash equivalents 165 11,768 6,618 — 18,551 Investment in subsidiaries 2,578,461 1,202,861 — (3,781,322 ) — Tenant receivables — — 3,760 — 3,760 Straight-line rent receivable — — 83,828 — 83,828 Prepaid expenses and other assets 140,890 352,349 7,309 (469,028 ) 31,520 Intangible lease origination costs, net — — 31,626 — 31,626 Deferred lease costs, net — — 58,932 — 58,932 Other assets held for sale — — 20,498 — 20,498 Total assets $ 2,721,496 $ 2,636,516 $ 3,116,067 $ (4,250,350 ) $ 4,223,729 Liabilities: Line of credit and notes payable, net $ — $ 680,456 $ 467,344 $ (467,344 ) $ 680,456 Bonds payable, net — 694,736 — — 694,736 Operating lease liabilities 2,626 — 32,112 — 34,738 Accounts payable, accrued expenses, and accrued capital expenditures 6 10,628 27,328 — 37,962 Due to affiliates — — 1,684 (1,684 ) — Deferred income — — 16,943 — 16,943 Intangible lease liabilities, net — — 19,539 — 19,539 Liabilities held for sale — — 20,491 — 20,491 Total liabilities 2,632 1,385,820 585,441 (469,028 ) 1,504,865 Equity: Total equity 2,718,864 1,250,696 2,530,626 (3,781,322 ) 2,718,864 Total liabilities and equity $ 2,721,496 $ 2,636,516 $ 3,116,067 $ (4,250,350 ) $ 4,223,729 Condensed Consolidating Balance Sheets (in thousands): As of December 31, 2018 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Assets: Real estate assets, at cost: Land $ — $ — $ 817,975 $ — $ 817,975 Building and improvements, net — 1,739 1,908,302 — 1,910,041 Intangible lease assets, net — — 98,540 — 98,540 Construction in progress — — 33,800 — 33,800 Total real estate assets — 1,739 2,858,617 — 2,860,356 Investments in unconsolidated joint ventures — 1,071,353 — — 1,071,353 Cash and cash equivalents 1,705 10,573 4,840 — 17,118 Investment in subsidiaries 2,622,528 1,236,982 — (3,859,510 ) — Tenant receivables, net — — 3,258 — 3,258 Straight-line rent receivable — — 87,159 — 87,159 Prepaid expenses and other assets 140,797 340,071 11,379 (469,029 ) 23,218 Intangible lease origination costs, net — — 34,092 — 34,092 Deferred lease costs, net — — 77,439 — 77,439 Total assets $ 2,765,030 $ 2,660,718 $ 3,076,784 $ (4,328,539 ) $ 4,173,993 Liabilities: Lines of credit and notes payable, net $ — $ 629,308 $ 467,344 $ (467,344 ) $ 629,308 Bonds payable, net — 694,538 — — 694,538 Accounts payable, accrued expenses, and accrued capital expenditures 674 9,441 39,007 (5 ) 49,117 Dividends payable 23,340 — — — 23,340 Due to affiliates — — 1,680 (1,680 ) — Deferred income — — 15,593 — 15,593 Intangible lease liabilities, net — — 21,081 — 21,081 Total liabilities 24,014 1,333,287 544,705 (469,029 ) 1,432,977 Equity: Total equity 2,741,016 1,327,431 2,532,079 (3,859,510 ) 2,741,016 Total liabilities and equity $ 2,765,030 $ 2,660,718 $ 3,076,784 $ (4,328,539 ) $ 4,173,993 Condensed Consolidating Statements of Operations (in thousands): For the Three Months Ended March 31, 2019 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Revenues: Rental income and tenant reimbursements $ — $ — $ 71,862 $ — $ 71,862 Asset and property management fee income 912 — 957 — 1,869 Other property income — — 1,702 — 1,702 912 — 74,521 — 75,433 Expenses: Property operating costs — — 24,237 — 24,237 Asset and property management fees — — 255 — 255 Depreciation — 171 20,233 — 20,404 Amortization — — 7,461 — 7,461 General and administrative – corporate 199 2,220 6,005 — 8,424 General and administrative – unconsolidated joint ventures — — 809 — 809 199 2,391 59,000 — 61,590 Other income (expense): Interest expense — (12,095 ) (5,053 ) 5,053 (12,095 ) Interest and other income 1,575 3,478 1 (5,053 ) 1 Income tax expense — — (7 ) — (7 ) Income (loss) from unconsolidated entities 1,225 14,933 (3 ) (14,384 ) 1,771 2,800 6,316 (5,062 ) (14,384 ) (10,330 ) Net income $ 3,513 $ 3,925 $ 10,459 $ (14,384 ) $ 3,513 Condensed Consolidating Statements of Operations (in thousands): For the Three Months Ended March 31, 2018 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Revenues: Rental income and tenant reimbursements $ — $ — $ 70,360 $ — $ 70,360 Asset and property management fee income 905 — 854 — 1,759 Other property income — — 1,591 — 1,591 905 — 72,805 — 73,710 Expenses: Property operating costs — — 23,062 — 23,062 Asset and property management fees — — 208 — 208 Depreciation — 167 20,668 — 20,835 Amortization — — 8,016 — 8,016 General and administrative – corporate 198 2,309 5,287 — 7,794 General and administrative – unconsolidated joint ventures — — 731 — 731 198 2,476 57,972 — 60,646 Other income (expense): Interest expense — (12,434 ) (10,494 ) 7,033 (15,895 ) Interest and other income 3,555 3,478 1,803 (7,033 ) 1,803 Gain on sale of unconsolidated joint venture interests — 762 — — 762 Income tax expense — — (7 ) — (7 ) Income (loss) from unconsolidated entities (2,764 ) 9,194 — (4,659 ) 1,771 791 1,000 (8,698 ) (4,659 ) (11,566 ) Net income (loss) $ 1,498 $ (1,476 ) $ 6,135 $ (4,659 ) $ 1,498 Condensed Consolidating Statements of Comprehensive Income (in thousands): For the Three Months Ended March 31, 2019 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Net income $ 3,513 $ 3,925 $ 10,459 $ (14,384 ) $ 3,513 Market value adjustments to interest rate swaps (1,431 ) (1,431 ) — 1,431 (1,431 ) Comprehensive income $ 2,082 $ 2,494 $ 10,459 $ (12,953 ) $ 2,082 For the Three Months Ended March 31, 2018 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Net income $ 1,498 $ (1,476 ) $ 6,135 $ (4,659 ) $ 1,498 Market value adjustments to interest rate swaps 2,514 2,514 — (2,514 ) 2,514 Comprehensive income $ 4,012 $ 1,038 $ 6,135 $ (7,173 ) $ 4,012 Condensed Consolidating Statements of Cash Flows (in thousands): For the Three Months Ended March 31, 2019 Columbia Property Trust (Guarantor) Columbia Property Trust OP (the Issuer) Non- Guarantors Consolidating Adjustments Columbia Property Trust Cash flows from operating activities $ 4,638 $ 2,948 $ 41,877 $ (14,384 ) $ 35,079 Cash flows from investing activities: Investment in real estate and related assets (13,701 ) — (20,951 ) — (34,652 ) Investments in unconsolidated joint ventures — (6,528 ) — — (6,528 ) Distributions from unconsolidated joint ventures — 5,672 — — 5,672 Distributions from subsidiaries 56,640 7,313 — (63,953 ) — Net cash provided by (used in) investing activities 42,939 6,457 (20,951 ) (63,953 ) (35,508 ) Cash flows from financing activities: Borrowings, net of fees — 73,979 — — 73,979 Repayments — (23,000 ) — — (23,000 ) Distributions (46,716 ) (59,189 ) (19,148 ) 78,337 (46,716 ) Repurchases of common stock (2,401 ) — — — (2,401 ) Net cash provided by (used in) financing activities (49,117 ) (8,210 ) (19,148 ) 78,337 1,862 Net increase (decrease) in cash and cash equivalents (1,540 ) 1,195 1,778 — 1,433 Cash and cash equivalents, beginning of period 1,705 10,573 4,840 — 17,118 Cash and cash equivalents, end of period $ 165 $ 11,768 $ 6,618 $ — $ 18,551 Condensed Consolidating Statements of Cash Flows (in thousands): For the Three Months Ended March 31, 2018 Columbia Property Trust (Guarantor) Columbia Property Trust OP (the Issuer) Non- Guarantors Consolidating Adjustments Columbia Property Trust Cash flows from operating activities $ 708 $ (5,326 ) $ 19,389 $ — $ 14,771 Cash flows from investing activities: Net proceeds from sale of investments in unconsolidated joint ventures — 235,083 — — 235,083 Investment in real estate and related assets — — (23,877 ) — (23,877 ) Investments in unconsolidated joint ventures — (1,541 ) — — (1,541 ) Distributions from unconsolidated joint ventures — 2,976 — — 2,976 Distributions from subsidiaries 75,935 (9,988 ) — (65,947 ) — Net cash provided by (used in) investing activities 75,935 226,530 (23,877 ) (65,947 ) 212,641 Cash flows from financing activities: Borrowings, net of fees — 108,983 — — 108,983 Repayments — (247,000 ) (814 ) — (247,814 ) Distributions (47,819 ) (77,811 ) 11,864 65,947 (47,819 ) Repurchases of common stock (29,261 ) — — — (29,261 ) Net cash provided by (used in) financing activities (77,080 ) (215,828 ) 11,050 65,947 (215,911 ) Net increase (decrease) in cash and cash equivalents (437 ) 5,376 6,562 — 11,501 Cash and cash equivalents, beginning of period 692 5,079 3,796 — 9,567 Cash and cash equivalents, end of period $ 255 $ 10,455 $ 10,358 $ — $ 21,068

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Event Columbia Property Trust has evaluated subsequent events in connection with the preparation of the consolidated financial statements and notes thereto included in this report on Form 10-Q, and notes that the sale of One & Three Glenlake Parkway closed on April 15, 2019. See Note 3, Real Estate Transactions , for additional details.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The consolidated financial statements of Columbia Property Trust have been prepared in accordance with the rules and regulations of the U.S. Securities and Exchange Commission ("SEC"), including the instructions to Form 10-Q and Article 10 of Regulation S-X, and do not include all of the information and footnotes required by U.S. generally accepted accounting principles ("GAAP") for complete financial statements. In the opinion of management, the statements for the unaudited interim periods presented include all adjustments, which are of a normal and recurring nature, necessary for a fair and consistent presentation of the results for such periods. Results for these interim periods are not necessarily indicative of a full year's results. For additional information on Columbia Property Trust's unconsolidated joint ventures, which are accounted for using the equity method of accounting, see Note 4, Unconsolidated Joint Ventures . Columbia Property Trust's consolidated financial statements include the accounts of Columbia Property Trust, Columbia Property Trust OP, and any variable-interest entity in which Columbia Property Trust or Columbia Property Trust OP is deemed the primary beneficiary. With respect to entities that are not variable interest entities, Columbia Property Trust's consolidated financial statements also include the accounts of any entity in which Columbia Property Trust, Columbia Property Trust OP, or their subsidiaries own a controlling financial interest and any limited partnership in which Columbia Property Trust, Columbia Property Trust OP, or their subsidiaries own a controlling general partnership interest. All intercompany balances and transactions have been eliminated in consolidation.
Fair Value Measurements	Fair Value Measurements Columbia Property Trust estimates the fair value of its assets and liabilities (where currently required under GAAP) consistent with the provisions of Accounting Standard Codification 820, Fair Value Measurements ("ASC 820"). Under this standard, fair value is defined as the price that would be received upon sale of an asset or paid upon transfer of a liability in an orderly transaction between market participants at the measurement date, under current market conditions. While various techniques and assumptions can be used to estimate fair value depending on the nature of the asset or liability, the accounting standard for fair value measurements and disclosures provides the following fair value technique parameters and hierarchy, depending upon availability: Level 1 – Assets or liabilities for which the identical term is traded on an active exchange, such as publicly traded instruments or futures contracts. Level 2 – Assets or liabilities valued based on observable market data for similar instruments. Level 3 – Assets or liabilities for which significant valuation assumptions are not readily observable in the market. Such assets or liabilities are valued based on the best available data, some of which may be internally developed. Significant assumptions may include risk premiums that a market participant would consider.
Real Estate Assets	Real Estate Assets Columbia Property Trust is required to make subjective assessments as to the useful lives of its depreciable assets. To determine the appropriate useful life of an asset, Columbia Property Trust considers the period of future benefit of the asset. These assessments have a direct impact on net income. The estimated useful lives of its assets by class are as follows: Buildings 40 years Building and site improvements 5-25 years Tenant improvements Shorter of economic life or lease term Intangible lease assets Lease term
Assets Held for Sale	Assets Held for Sale Columbia Property Trust classifies properties as held for sale according to Accounting Standard Codification 360, Accounting for the Impairment or Disposal of Long-Lived Assets ("ASC 360"). According to ASC 360, properties having separately identifiable operations and cash flows are considered held for sale when all of the following criteria are met: • Management, having the authority to approve the action, commits to a plan to sell the property. • The property is available for immediate sale in its present condition subject only to terms that are usual and customary for sales of such property. • An active program to locate a buyer and other actions required to complete the plan to sell the property have been initiated. • The property is being actively marketed for sale at a price that is reasonable in relation to its current fair value. • Actions required to complete the plan indicate that it is unlikely that significant changes to the plan will be made or that the plan will be withdrawn. • The sale of the property is probable (i.e., typically subject to a binding sale contract with a non-refundable deposit), and transfer of the property is expected to qualify for recognition as a completed sale within one year.
Evaluating the Recoverability of Real Estate Assets	Evaluating the Recoverability of Real Estate Assets Columbia Property Trust continually monitors events and changes in circumstances that could indicate that the net carrying amounts of its real estate and related intangible assets and liabilities, of both operating properties and properties under development or redevelopment, may not be recoverable. When indicators of potential impairment are present that suggest that the net carrying amounts of real estate assets and related intangible assets and liabilities may not be recoverable, Columbia Property Trust assesses the recoverability of these net assets by determining whether the respective carrying values will be recovered through the estimated undiscounted future cash flows expected from the use of the net assets and their eventual disposition. In the event that such expected undiscounted future cash flows do not exceed the carrying values, Columbia Property Trust adjusts the carrying values of the real estate assets and related intangible assets and liabilities to the estimated fair values, pursuant to the property, plant, and equipment accounting standard for the impairment or disposal of long-lived assets, and recognizes an impairment loss. At such time that a property is required to be classified as held for sale, its net carrying amount is adjusted to the lower of its depreciated book value or its estimated fair value, less costs to sell, and depreciation is no longer recognized.
Intangible Assets and Liabilities Arising From In-Place Leases Where Columbia Property Trust Is the Lessor	Intangible Assets and Liabilities Arising From In-Place Leases Where Columbia Property Trust Is the Lessor Upon the acquisition of real properties, Columbia Property Trust allocates the purchase price of the properties to tangible assets, consisting of land, building, site improvements, and identified intangible assets and liabilities, including the value of in-place leases, based in each case on Columbia Property Trust's estimate of their fair values in accordance with ASC 820 (see "Fair Value Measurements" section above for additional detail).
Interest Rate Swap Agreements	Interest Rate Swap Agreements Columbia Property Trust enters into interest rate swap contracts to mitigate its interest rate risk on the related financial instruments. Columbia Property Trust does not enter into derivative or interest rate swap transactions for speculative purposes; however, certain of its derivatives may not qualify for hedge accounting treatment. Columbia Property Trust records the fair value of its interest rate swaps on its consolidated balance sheet either as prepaid expenses and other assets or as accounts payable, accrued expenses, and accrued capital expenditures. Changes in the fair value of interest rate swaps that are designated as cash flow hedges are recorded as other comprehensive income. Changes in the fair value of interest rate swaps that do not qualify for hedge accounting treatment are recorded as gain or loss on interest rate swaps. Amounts received or paid under interest rate swap agreements are recorded as interest expense for contracts that qualify for hedge accounting treatment and as gain or loss on interest rate swaps for contracts that do not qualify for hedge accounting treatment.
Income Taxes	Income Taxes Columbia Property Trust has elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended (the "Code") and has operated as such beginning with its taxable year ended December 31, 2003. To qualify as a REIT, Columbia Property Trust must meet certain organizational and operational requirements, including a requirement to distribute at least 90% of its REIT taxable income, as defined by the Code, to its stockholders. To the extent that Columbia Property Trust satisfies the distribution requirement but distributes less than 100% of its REIT taxable income, Columbia Property Trust would be subject to federal and state corporate income tax on the undistributed income. Generally, Columbia Property Trust does not incur federal income taxes, other than as described in the following paragraph, because its stockholder distributions typically exceed its taxable income due to noncash expenses such as depreciation. Columbia Property Trust is, however, subject to certain state and local taxes related to the operations of properties in certain locations, which have been provided for in the accompanying consolidated financial statements. Columbia Property Trust TRS, LLC, Columbia KCP TRS, LLC, and Columbia Energy TRS, LLC (collectively, the "TRS Entities") are wholly owned subsidiaries of Columbia Property Trust and are organized as Delaware limited liability companies. The TRS Entities, among other things, provide tenant services that Columbia Property Trust, as a REIT, cannot otherwise provide. Columbia Property Trust has elected to treat the TRS Entities as taxable REIT subsidiaries. Columbia Property Trust may perform certain additional, noncustomary services for tenants of its buildings through the TRS Entities; however, any earnings related to such services are subject to federal and state income taxes. In addition, for Columbia Property Trust to continue to qualify as a REIT, Columbia Property Trust must limit its investments in taxable REIT subsidiaries to 20% of the value of the total assets. The TRS Entities' deferred tax assets and liabilities represent temporary differences between the financial reporting basis and the tax basis of assets and liabilities based on the enacted rates expected to be in effect when the temporary differences reverse. If applicable, Columbia Property Trust records interest and penalties related to uncertain tax positions as general and administrative expense in the accompanying consolidated statements of operations.
Reclassification	Reclassification In connection with adopting Accounting Standard Codification ("ASC") 842, Leases ("ASC 842"), effective January 1, 2019, rental income and tenant reimbursements have been combined into a single line on the consolidated statements of operations for all periods presented. See Recent Accounting Pronouncements below for additional details.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Effective January 1, 2019, Columbia Property Trust adopted ASC 842, which amends the lease accounting rules with the following key changes: • Lessees are required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months, and to classify such leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase of the leased asset by the lessee, or not. This classification will determine whether the lease expense is recognized using the effective interest method (finance leases) or on a straight-line basis over the term of the lease (operating leases). • Lessors are required to account for leases using an approach that is substantially similar to the pre-existing rules for operating leases, sales-type leases and direct financing leases, with a few targeted changes, including that: (i) lessors are no longer permitted to capitalize and amortize initial indirect costs incurred to obtain a lease, and (ii) provisions for uncollectible tenant receivables are reflected as a reduction to lease revenues, instead of as general and administrative expense. In connection with transitioning to ASC 842, Columbia Property Trust elected to use certain practical expedients which impact the Company as follows: • Prospective implementation. In-place contracts retain their character as to whether they meet the definition of a lease or not; in-place leases retain their classification as an operating, sales-type, or direct financing lease; and prior-period accounting and presentation is unchanged. • Rental income and tenant reimbursements are combined in a single line on the statements of operations for all periods presented. • Leases with a term of 12 months or less are expensed as incurred, as provided for in a practical expedient elected by Columbia Property Trust. See Note 10, Leases , for additional information. Accounting Standard Update 2018-13 , Fair Value Measurement: Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement ("ASU 2018-13"), which will be effective for Columbia Property Trust on January 1, 2020, expands the disclosure requirements related to a change in fair value technique hierarchy. ASU 2018-13 is not expected to have a material impact on Columbia Property Trust's consolidated financial statements or disclosures.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Schedule of Estimated Useful Lives for Real Estate Assets	The estimated useful lives of its assets by class are as follows: Buildings 40 years Building and site improvements 5-25 years Tenant improvements Shorter of economic life or lease term Intangible lease assets Lease term
Schedule of Major Classes of Assets and Liabilities Classified as Held For Sale	The major classes of assets and liabilities classified as held for sale as of March 31, 2019 are provided below (in thousands): March 31, 2019 Real Estate Assets Held for Sale: Real Estate Assets, at Cost: Land $ 13,989 Buildings and improvements, less accumulated depreciation of $46,118 104,030 Intangible lease assets, less accumulated amortization of $10,830 533 Construction in progress 26,794 Total real estate assets held for sale, net $ 145,346 Other Assets Held for Sale: Tenant receivables $ 53 Straight-line rent receivable 7,700 Prepaid expenses and other assets 49 Intangible lease origination costs, less accumulated amortization of $7,109 350 Deferred lease costs, less accumulated amortization of $6,484 12,346 Total other assets held for sale, net $ 20,498 Liabilities Held for Sale: Accounts payable, accrued expenses, and accrued capital expenditures $ 19,632 Deferred income 743 Intangible lease liabilities, less accumulated amortization of $380 116 Total liabilities held for sale, net $ 20,491 During 2018 , Columbia Property Trust disposed of the following properties, or partial interests in properties of unconsolidated joint ventures: Property Location Date % Sold Sales Price (1) (in thousands) Gain on Sale (in thousands) 222 East 41st Street New York, NY May 29, 2018 100.0 % $ 332,500 $ — 263 Shuman Boulevard Chicago, IL April 13, 2018 100.0 % $ 49,000 $ 24,000 University Circle & San Francisco, CA February 1, 2018 22.5 % $ 235,300 $ 800 (1) Exclusive of transaction costs and price adjustments.
Schedule of Intangible Assets and Liabilities	As of March 31, 2019 and December 31, 2018 , Columbia Property Trust had the following intangible assets and liabilities, arising from in-place leases, excluding amounts held for sale, if applicable (in thousands): Intangible Lease Assets Intangible Lease Origination Costs Intangible Below-Market In-Place Lease Liabilities Above-Market In-Place Lease Assets Absorption Period Costs March 31, 2019 Gross $ 3,174 $ 135,883 $ 91,812 $ 42,351 Accumulated Amortization (1,142 ) (73,665 ) (60,186 ) (22,812 ) Net $ 2,032 $ 62,218 $ 31,626 $ 19,539 December 31, 2018 Gross $ 3,174 $ 147,668 $ 99,440 $ 42,847 Accumulated Amortization (1,060 ) (81,220 ) (65,348 ) (21,766 ) Net $ 2,114 $ 66,448 $ 34,092 $ 21,081 For the three months ended March 31, 2019 and 2018 , Columbia Property Trust recognized the following amortization of intangible lease assets and liabilities (in thousands): Intangible Lease Assets Intangible Lease Origination Costs Intangible Below-Market In-Place Lease Liabilities Above-Market In-Place Lease Assets Absorption Period Costs For the Three Months Ended March 31, 2019 $ 82 $ 3,656 $ 2,100 $ 1,426 For the Three Months Ended March 31, 2018 $ 51 $ 4,339 $ 2,419 $ 1,589 The net intangible assets and liabilities remaining as of March 31, 2019 will be amortized as follows, excluding amounts held for sale, if applicable (in thousands): Intangible Lease Assets Intangible Lease Origination Costs Intangible Below-Market In-Place Lease Liabilities Above-Market In-Place Lease Assets Absorption Period Costs For the remainder of 2019 $ 246 $ 10,397 $ 5,963 $ 4,122 For the years ending December 31: 2020 275 12,338 7,406 4,597 2021 247 7,490 3,429 1,714 2022 243 5,848 2,406 1,374 2023 243 5,098 2,165 1,308 2024 230 4,756 2,062 1,162 Thereafter 548 16,291 8,195 5,262 $ 2,032 $ 62,218 $ 31,626 $ 19,539
Schedule of Interest Rate Swaps	The following tables provide additional information related to Columbia Property Trust's interest rate swaps (in thousands): Estimated Fair Value as of Instrument Type Balance Sheet Classification March 31, December 31, Derivatives designated as hedging instruments: Interest rate contracts Prepaid expenses and other assets $ 913 $ 2,344
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position	Three Months Ended 2019 2018 Market value adjustment to interest rate swaps designated as hedging instruments and included in other comprehensive income $ (1,431 ) $ 2,514

Real Estate Transactions (Table

Real Estate Transactions (Tables)	3 Months Ended
	Mar. 31, 2019
Real Estate [Abstract]
Schedule of Properties Acquired	During 2018 , Columbia Property Trust acquired the following properties and partial interests in properties. Columbia Property Trust did not acquire any properties during the three months ended March 31, 2019 . Property Location Date Percent Acquired Purchase Price (1) (in thousands) 2018 799 Broadway New York, NY October 3, 2018 49.7 % $ 30,200 (2) Lindbergh Center – Retail Atlanta, GA October 24, 2018 100.0 % $ 23,000 (1) Exclusive of transaction costs and price adjustments. See purchase price allocation table below for a breakout of the net purchase price for wholly owned properties. (2) Purchase price is for Columbia Property Trust's partial interests in the property, which is owned through an unconsolidated joint venture. Purchase Price Allocations for Consolidated Property Acquisitions Lindbergh Center – Retail Location Atlanta, GA Date acquired October 24, 2018 Purchase Price (in thousands): Building and improvements $ 17,558 Intangible lease assets 5,726 Intangible lease origination costs 794 Intangible below market lease liability (715 ) Total purchase price $ 23,363
Unaudited Pro Forma Financial Results	The following unaudited pro forma financial results for Columbia Property Trust have been prepared for informational purposes only and are not necessarily indicative of future results or of actual results that would have been achieved had this acquisition been consummated as of January 1, 2017 (in thousands): Three Months Ended Revenues $ 74,458 Net income $ 1,521
Schedule of Properties Sold	The major classes of assets and liabilities classified as held for sale as of March 31, 2019 are provided below (in thousands): March 31, 2019 Real Estate Assets Held for Sale: Real Estate Assets, at Cost: Land $ 13,989 Buildings and improvements, less accumulated depreciation of $46,118 104,030 Intangible lease assets, less accumulated amortization of $10,830 533 Construction in progress 26,794 Total real estate assets held for sale, net $ 145,346 Other Assets Held for Sale: Tenant receivables $ 53 Straight-line rent receivable 7,700 Prepaid expenses and other assets 49 Intangible lease origination costs, less accumulated amortization of $7,109 350 Deferred lease costs, less accumulated amortization of $6,484 12,346 Total other assets held for sale, net $ 20,498 Liabilities Held for Sale: Accounts payable, accrued expenses, and accrued capital expenditures $ 19,632 Deferred income 743 Intangible lease liabilities, less accumulated amortization of $380 116 Total liabilities held for sale, net $ 20,491 During 2018 , Columbia Property Trust disposed of the following properties, or partial interests in properties of unconsolidated joint ventures: Property Location Date % Sold Sales Price (1) (in thousands) Gain on Sale (in thousands) 222 East 41st Street New York, NY May 29, 2018 100.0 % $ 332,500 $ — 263 Shuman Boulevard Chicago, IL April 13, 2018 100.0 % $ 49,000 $ 24,000 University Circle & San Francisco, CA February 1, 2018 22.5 % $ 235,300 $ 800 (1) Exclusive of transaction costs and price adjustments.

Unconsolidated Joint Ventures (

Unconsolidated Joint Ventures (Tables)	3 Months Ended
	Mar. 31, 2019
Equity Method Investments and Joint Ventures [Abstract]
Summary of Financial Information for the Joint Ventures	During the three months ended March 31, 2019 and 2018 , Columbia Property Trust earned the following fees from these unconsolidated joint ventures (in thousands): Three Months Ended 2019 2018 Market Square Joint Venture $ 568 $ 523 University Circle Joint Venture 574 529 333 Market Street Joint Venture 207 197 1800 M Street Joint Venture 520 510 $ 1,869 $ 1,759 As of March 31, 2019 and December 31, 2018 , Columbia Property Trust owned interests in the following properties through joint ventures, which are accounted for using the equity method of accounting: Carrying Value of Investment (1) Joint Venture Property Name Geographic Market Ownership Interest March 31, 2019 December 31, 2018 Market Square Joint Venture Market Square Washington, D.C. 51.0 % $ 137,825 $ 134,250 University Circle Joint Venture University Circle San Francisco 55.0 % 291,159 292,951 333 Market Street Joint Venture 333 Market Street San Francisco 55.0 % 272,519 273,783 114 Fifth Avenue Joint Venture 114 Fifth Avenue New York 49.5 % 96,059 99,283 1800 M Street Joint Venture 1800 M Street Washington, D.C. 55.0 % 234,837 237,333 799 Broadway Joint Venture (2) 799 Broadway New York, NY 49.7 % 35,506 33,753 $ 1,067,905 $ 1,071,353 (1) Includes basis differences. (2) Columbia Property Trust capitalized interest of $0.3 million on its investment in the 799 Broadway Joint Venture during the three months ended March 31, 2019 . Summarized balance sheet information for each of the unconsolidated joint ventures is as follows (in thousands): Total Assets Total Debt Total Equity (1) March 31, 2019 December 31, 2018 March 31, 2019 December 31, 2018 March 31, 2019 December 31, 2018 Market Square Joint Venture $ 586,797 $ 582,176 $ 324,775 (2) $ 324,762 $ 248,004 $ 241,581 University Circle Joint Venture 225,398 224,746 — — 218,753 219,390 333 Market Street Joint Venture 372,814 375,884 — — 358,452 360,915 114 Fifth Avenue Joint Venture 498,686 377,970 — — 143,138 149,243 1800 M Street Joint Venture 441,114 447,585 — — 424,501 429,016 799 Broadway Joint Venture 170,075 168,390 98,130 (3) 95,630 69,836 67,189 $ 2,294,884 $ 2,176,751 $ 422,905 $ 420,392 $ 1,462,684 $ 1,467,334 (1) Excludes basis differences. There is an aggregate net difference of $281.2 million and $282.0 million as of March 31, 2019 and December 31, 2018 , respectively, between the historical costs recorded at the joint venture level, and Columbia Property Trust's investments in unconsolidated joint ventures. Such basis differences result from the timing of each partner's joint venture interest acquisition; and formation costs incurred by Columbia Property Trust. Basis differences are amortized to income (loss) from unconsolidated joint ventures over the lives of the underlying assets or liabilities. (2) The Market Square Joint Venture has a $325.0 million mortgage note. The Market Square mortgage note bears interest at 5.07% and matures on July 1, 2023. For a discussion of Columbia Property Trust's guaranty of a portion of this mortgage note, see Note 7, Commitments and Contingencies . (3) Reflects $103.1 million outstanding, net of $5.0 million of net unamortized deferred financing costs, on the 799 Broadway construction loan. The 799 Broadway construction loan is being used to finance a portion of the 799 Broadway development project, has total capacity of $187.0 million and bears interest at LIBOR, capped at 4.00% , plus a spread of 425 basis points (the "Construction Loan"). A portion of the monthly interest payments accrue into the balance of the loan. The Construction Loan matures on October 9, 2021, with two one -year extension options. For a discussion of Columbia Property Trust's equity guaranty related to the Construction Loan, see Note 7, Commitments and Contingencies . Summarized income statement information for the unconsolidated joint ventures for the three months ended March 31, 2019 and 2018 is as follows (in thousands): Total Revenues Net Income (Loss) Columbia Property Trust's Share of Net Income (Loss) (1) 2019 2018 2019 2018 2019 2018 Market Square Joint Venture $ 11,337 $ 11,015 $ (2,595 ) $ (3,009 ) $ (1,323 ) $ (1,534 ) University Circle Joint Venture 11,272 10,341 6,364 5,505 3,500 3,429 333 Market Street Joint Venture 7,054 6,668 3,713 3,557 2,042 2,227 114 Fifth Avenue Joint Venture 10,919 10,300 (2,506 ) (2,331 ) (1,240 ) (1,154 ) 1800 M Street Joint Venture 9,454 8,897 388 243 214 133 799 Broadway Joint Venture — — (526 ) — (262 ) — $ 50,036 $ 47,221 $ 4,838 $ 3,965 $ 2,931 $ 3,101 (1) Excludes amortization of basis differences described in footnote (1) to the above table, which are recorded as income (loss) from unconsolidated joint ventures in the accompanying consolidated statements of operations.

Line of Credit and Notes Paya_2

Line of Credit and Notes Payable (Tables)	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Schedule of Line of Credit and Notes Payable Indebtedness	As of March 31, 2019 and December 31, 2018 , Columbia Property Trust had the following line of credit and notes payable indebtedness (excluding bonds payable; see Note 6, Bonds Payable ) (in thousands): Facility March 31, December 31, Revolving Credit Facility $ 533,000 $ 482,000 $150 Million Term Loan 150,000 150,000 Less: Deferred financing costs related to term loans and notes payable, net of accumulated amortization (2,544 ) (2,692 ) $ 680,456 $ 629,308

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Summary of the Activity of Employee Stock Grants	Below is a summary of the employee awards issued under the LTI Plan in the three months ended March 31, 2019 : Time-Based Awards Performance-Based Awards Restricted Shares Weighted-Average (1) RSUs (in thousands) Weighted-Average (2) Unvested awards – beginning of period 375 $ 22.15 454 $ 19.37 Granted 175 $ 19.35 256 (3) $ 17.66 Vested (165 ) $ 21.98 (121 ) $ 19.08 Forfeited — $ — — $ — Unvested awards – end of period (4) 385 $ 20.95 589 $ 18.77 (1) Reflects the weighted-average, grant-date fair value using the market closing price on the date of the respective grants. (2) Reflects the weighted-average, grant-date fair value using a Monte Carlo valuation. (3) Includes approximately 35,000 RSUs, which were converted to shares based on performance, as defined by the LTI Plan, over the period from January 1, 2017 through December 31, 2018. (4) As of March 31, 2019 , Columbia Property Trust expects approximately 370,000 of the 385,000 unvested restricted stock units to ultimately vest and approximately 566,000 of the 589,000 unvested Performance-Based RSUs, assuming a weighted-average forfeiture rate of 3.8% , which was determined based on historical forfeiture rates.
Schedule of Stock-based Compensation Expense Incurred	For the three months ended March 31, 2019 and 2018 , Columbia Property Trust incurred stock-based compensation expense related to the following events (in thousands): Three Months Ended 2019 2018 Amortization of time-based awards granted under the LTI Plan $ 884 $ 1,036 Amortization of performance-based awards granted under the LTI Plan (1) 655 492 Total stock-based compensation expense $ 1,539 $ 1,528 (1) Reflects amortization of awards made under the LTI Plan for service during the current period, for which shares will be issued in future periods.

Supplemental Disclosures of N_2

Supplemental Disclosures of Noncash Investing and Financing Activities (Tables)	3 Months Ended
	Mar. 31, 2019
Supplemental Cash Flow Elements [Abstract]
Significant Noncash Investing and Financing Activities	Outlined below are significant noncash investing and financing activities for the three months ended March 31, 2019 and 2018 (in thousands): Three Months Ended 2019 2018 Amortization of net discounts on debt $ 45 $ 45 Accrued investments in unconsolidated joint ventures $ 88 $ — Accrued capital expenditures and deferred lease costs $ 19,603 $ 12,414 Operating lease liability recorded at adoption of ASC 842 $ 34,791 $ — Market value adjustments to interest rate swaps that qualify for hedge accounting treatment $ (1,431 ) $ 2,514 Cumulative-effect adjustment to equity for the adoption of ASU 2017-05, Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Non-Financial Assets $ — $ 357,755 Amortization of common stock issued to employees and directors $ 1,539 $ 1,528

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Schedule of Future Minimum Lease Payments To Be Made	As of March 31, 2019, the future minimum lease payments to be made by Columbia Property Trust under its operating leases are as follows (thousands): Remainder of 2019 $ 1,877 2020 2,539 2021 2,704 2022 2,743 2023 2,023 2024 1,962 Thereafter 174,821 Total lease payments 188,669 Less: interest expense (153,931 ) Present value of lease liabilities $ 34,738 Weighted-average remaining lease term (years) 76 years Weighted-average discount rate 6.6 %
Schedule of Future Minimum Lease Payments to be Made and Received	As of December 31, 2018 , the future minimum lease payments to be made by Columbia Property Trust under its operating leases are as follows (in thousands): 2019 $ 2,502 2020 2,539 2021 2,704 2022 2,743 2023 2,023 Thereafter 176,782 Total $ 189,293 As of December 31, 2018 , the future minimum lease payments due to Columbia Property Trust under non-cancelable operating leases are as follows (in thousands): 2019 $ 242,370 2020 247,826 2021 221,692 2022 209,845 2023 192,261 Thereafter 1,106,275 Total $ 2,220,269
Summary of Impact of Operating Leases on Consolidated Balance Sheet	Columbia Property Trust's operating leases had the following impacts on the consolidated balance sheet as of March 31, 2019 (in thousands): Ground Leases Office Lease Total Operating Leases Assets: Total operating lease assets $ 61,849 $ 1,980 $ 63,829 Liabilities: Total operating lease liabilities $ 32,112 $ 2,626 $ 34,738
Summary of Impact of Operating Leases on Statements of Operations and Statements of Cash Flows	Columbia Property Trust's operating leases had the following impacts on the consolidated statements of operations for the three months ended March 31, 2019 (in thousands): Ground Leases Office Lease Total Operating Leases Property operating costs $ 692 $ — $ 692 General and administrative – corporate — 145 145 Total operating lease expenses $ 692 $ 145 $ 837 Columbia Property Trust's operating leases had the following impacts on the consolidated statements of cash flows for the three months ended March 31, 2019: Ground Leases Office Lease Total Operating Leases Cash paid for operating lease liabilities included in cash flows from operations $ (451 ) $ (174 ) $ (625 )
Summary of Fixed and Variable Revenues	Fixed and variable payments for the three months ended March 31, 2019 are as follows (in thousands): Three Months Ended March 31, 2019 Fixed payments $ 65,517 Variable payments 6,345 Total rental income and tenant reimbursements $ 71,862
Schedule of Future Minimum Lease Payments To Be Received	As of March 31, 2019, the future minimum lease payments due to Columbia Property Trust under non-cancelable operating leases are as follows (thousands): Remainder of 2019 $ 184,860 2020 251,836 2021 225,294 2022 213,492 2023 196,011 2024 183,205 Thereafter 939,626 Total $ 2,194,324

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Schedule of Basic and Diluted Earnings Per Share Computations	The following table reconciles the numerator for the basic and diluted earnings-per-share computations shown on the consolidated statements of operations for the three months ended March 31, 2019 and 2018 (in thousands): Three Months Ended 2019 2018 Net income $ 3,513 $ 1,498 Distributions paid on unvested shares (77 ) (73 ) Net income used to calculate basic and diluted earnings per share $ 3,436 $ 1,425 The following table reconciles the denominator for the basic and diluted earnings-per-share computations shown on the consolidated statements of operations for the three months ended March 31, 2019 and 2018 , respectively (in thousands): Three Months Ended 2019 2018 Weighted-average common shares – basic 116,462 119,082 Plus incremental weighted-average shares from time-vested conversions, less assumed stock repurchases: Previously granted awards, unvested 90 70 Future period LTI Plan awards 328 198 Weighted-average common shares – diluted 116,880 119,350

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Reconciliation of Revenue from Segments to Consolidated	The following table presents operating revenues included in NOI by geographic reportable segment for Columbia Property Trust's respective ownership interests (in thousands): Three Months Ended March 31, 2019 2018 New York (1) $ 38,696 $ 40,909 San Francisco (2) 27,763 23,520 Atlanta 11,223 9,858 Washington, D.C. (3) 14,130 13,972 Boston 3,674 3,370 Los Angeles 1,934 1,920 All other office markets 3,903 3,936 Total office segments 101,323 97,485 Corporate 786 681 Total operating revenues $ 102,109 $ 98,166 (1) Includes operating revenues for one unconsolidated property, 114 Fifth Avenue, based on Columbia Property Trust's ownership interest: 49.5% for all periods presented. (2) Includes operating revenues for two unconsolidated properties, 333 Market Street and University Circle, based on Columbia Property Trust's ownership interests: 77.5% from January 1, 2018 through January 31, 2018; and 55.0% from February 1, 2018 through March 31, 2019. (3) Includes operating revenues for two unconsolidated properties, Market Square and 1800 M Street, based on Columbia Property Trust's ownership interests: 51.0% for the Market Square and 55.0% for 1800 M Street for all periods presented. A reconciliation of GAAP revenues to operating revenues is presented below (in thousands): Three Months Ended March 31, 2019 2018 Total revenues $ 75,433 $ 73,710 Operating revenues included in income from unconsolidated joint ventures (1) 28,545 26,215 Less: asset and property management fee income (2) (1,869 ) (1,759 ) Total operating revenues $ 102,109 $ 98,166 (1) Columbia Property Trust records its interest in properties held through unconsolidated joint ventures using the equity method of accounting, and reflects its interest in the operating revenues of these properties in income from unconsolidated joint ventures in the accompanying consolidated statements of operations. (2) See Note 11, Non-Lease Revenues , of the accompanying consolidated financial statements.
Schedule of Segment Reporting Information, by Segment	The following table presents NOI by geographic reportable segment (in thousands): Three Months Ended March 31, 2019 2018 New York (1) $ 22,806 $ 24,179 San Francisco (2) 20,497 19,554 Atlanta 8,151 8,754 Washington, D.C. (3) 8,453 8,330 Boston 1,989 1,768 Los Angeles 1,119 1,208 All other office markets 3,836 3,291 Total office segments 66,851 67,084 Corporate (205 ) (225 ) Total NOI $ 66,646 $ 66,859 (1) Includes NOI for two unconsolidated properties, 114 Fifth Avenue and 799 Broadway, based on Columbia Property Trust's ownership interest: 49.5% for 114 Fifth Avenue for all periods presented; and 49.7% for 799 Broadway from October 3, 2018 through March 31, 2019. (2) Includes NOI for two unconsolidated properties, 333 Market Street and University Circle, based on Columbia Property Trust's ownership interests: 77.5% from January 1, 2018 through January 31, 2018; and 55.0% from February 1, 2018 through March 31, 2019. (3) Includes NOI for two unconsolidated properties, Market Square and 1800 M Street, based on Columbia Property Trust's ownership interests: 51.0% for the Market Square and 55.0% for 1800 M Street for all periods presented. A reconciliation of GAAP net income to NOI is presented below (in thousands): Three Months Ended March 31, 2019 2018 Net income $ 3,513 $ 1,498 Depreciation 20,404 20,835 Amortization 7,461 8,016 General and administrative – corporate 8,424 7,794 General and administrative – unconsolidated joint ventures 809 731 Net interest expense 12,094 15,892 Interest income from development authority bonds — (1,800 ) Gain on sale of unconsolidated joint venture interests — (762 ) Income tax expense 7 7 Asset and property management fee income (1,869 ) (1,759 ) Adjustments included in income from unconsolidated joint ventures 15,803 16,407 NOI $ 66,646 $ 66,859

Financial Information for Par_2

Financial Information for Parent Guarantor, Issuer Subsidiary, and Non-Guarantor Subsidiaries (Tables)	3 Months Ended
	Mar. 31, 2019
Condensed Financial Information Disclosure [Abstract]
Condensed Consolidating Balance Sheets	Condensed Consolidating Balance Sheets (in thousands): As of March 31, 2019 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Assets: Real estate assets, at cost: Land $ — $ — $ 803,986 $ — $ 803,986 Buildings and improvements, net — 1,633 1,790,293 — 1,791,926 Intangible lease assets, net — — 64,250 — 64,250 Construction in progress — — 37,772 — 37,772 Real estate assets held for sale, net — — 145,346 — 145,346 Total real estate assets — 1,633 2,841,647 — 2,843,280 Operating lease assets 1,980 — 61,849 — 63,829 Investments in unconsolidated joint ventures — 1,067,905 — — 1,067,905 Cash and cash equivalents 165 11,768 6,618 — 18,551 Investment in subsidiaries 2,578,461 1,202,861 — (3,781,322 ) — Tenant receivables — — 3,760 — 3,760 Straight-line rent receivable — — 83,828 — 83,828 Prepaid expenses and other assets 140,890 352,349 7,309 (469,028 ) 31,520 Intangible lease origination costs, net — — 31,626 — 31,626 Deferred lease costs, net — — 58,932 — 58,932 Other assets held for sale — — 20,498 — 20,498 Total assets $ 2,721,496 $ 2,636,516 $ 3,116,067 $ (4,250,350 ) $ 4,223,729 Liabilities: Line of credit and notes payable, net $ — $ 680,456 $ 467,344 $ (467,344 ) $ 680,456 Bonds payable, net — 694,736 — — 694,736 Operating lease liabilities 2,626 — 32,112 — 34,738 Accounts payable, accrued expenses, and accrued capital expenditures 6 10,628 27,328 — 37,962 Due to affiliates — — 1,684 (1,684 ) — Deferred income — — 16,943 — 16,943 Intangible lease liabilities, net — — 19,539 — 19,539 Liabilities held for sale — — 20,491 — 20,491 Total liabilities 2,632 1,385,820 585,441 (469,028 ) 1,504,865 Equity: Total equity 2,718,864 1,250,696 2,530,626 (3,781,322 ) 2,718,864 Total liabilities and equity $ 2,721,496 $ 2,636,516 $ 3,116,067 $ (4,250,350 ) $ 4,223,729 Condensed Consolidating Balance Sheets (in thousands): As of December 31, 2018 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Assets: Real estate assets, at cost: Land $ — $ — $ 817,975 $ — $ 817,975 Building and improvements, net — 1,739 1,908,302 — 1,910,041 Intangible lease assets, net — — 98,540 — 98,540 Construction in progress — — 33,800 — 33,800 Total real estate assets — 1,739 2,858,617 — 2,860,356 Investments in unconsolidated joint ventures — 1,071,353 — — 1,071,353 Cash and cash equivalents 1,705 10,573 4,840 — 17,118 Investment in subsidiaries 2,622,528 1,236,982 — (3,859,510 ) — Tenant receivables, net — — 3,258 — 3,258 Straight-line rent receivable — — 87,159 — 87,159 Prepaid expenses and other assets 140,797 340,071 11,379 (469,029 ) 23,218 Intangible lease origination costs, net — — 34,092 — 34,092 Deferred lease costs, net — — 77,439 — 77,439 Total assets $ 2,765,030 $ 2,660,718 $ 3,076,784 $ (4,328,539 ) $ 4,173,993 Liabilities: Lines of credit and notes payable, net $ — $ 629,308 $ 467,344 $ (467,344 ) $ 629,308 Bonds payable, net — 694,538 — — 694,538 Accounts payable, accrued expenses, and accrued capital expenditures 674 9,441 39,007 (5 ) 49,117 Dividends payable 23,340 — — — 23,340 Due to affiliates — — 1,680 (1,680 ) — Deferred income — — 15,593 — 15,593 Intangible lease liabilities, net — — 21,081 — 21,081 Total liabilities 24,014 1,333,287 544,705 (469,029 ) 1,432,977 Equity: Total equity 2,741,016 1,327,431 2,532,079 (3,859,510 ) 2,741,016 Total liabilities and equity $ 2,765,030 $ 2,660,718 $ 3,076,784 $ (4,328,539 ) $ 4,173,993
Consolidating Statements of Operations	Consolidating Statements of Operations (in thousands): For the Three Months Ended March 31, 2019 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Revenues: Rental income and tenant reimbursements $ — $ — $ 71,862 $ — $ 71,862 Asset and property management fee income 912 — 957 — 1,869 Other property income — — 1,702 — 1,702 912 — 74,521 — 75,433 Expenses: Property operating costs — — 24,237 — 24,237 Asset and property management fees — — 255 — 255 Depreciation — 171 20,233 — 20,404 Amortization — — 7,461 — 7,461 General and administrative – corporate 199 2,220 6,005 — 8,424 General and administrative – unconsolidated joint ventures — — 809 — 809 199 2,391 59,000 — 61,590 Other income (expense): Interest expense — (12,095 ) (5,053 ) 5,053 (12,095 ) Interest and other income 1,575 3,478 1 (5,053 ) 1 Income tax expense — — (7 ) — (7 ) Income (loss) from unconsolidated entities 1,225 14,933 (3 ) (14,384 ) 1,771 2,800 6,316 (5,062 ) (14,384 ) (10,330 ) Net income $ 3,513 $ 3,925 $ 10,459 $ (14,384 ) $ 3,513 Condensed Consolidating Statements of Operations (in thousands): For the Three Months Ended March 31, 2018 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Revenues: Rental income and tenant reimbursements $ — $ — $ 70,360 $ — $ 70,360 Asset and property management fee income 905 — 854 — 1,759 Other property income — — 1,591 — 1,591 905 — 72,805 — 73,710 Expenses: Property operating costs — — 23,062 — 23,062 Asset and property management fees — — 208 — 208 Depreciation — 167 20,668 — 20,835 Amortization — — 8,016 — 8,016 General and administrative – corporate 198 2,309 5,287 — 7,794 General and administrative – unconsolidated joint ventures — — 731 — 731 198 2,476 57,972 — 60,646 Other income (expense): Interest expense — (12,434 ) (10,494 ) 7,033 (15,895 ) Interest and other income 3,555 3,478 1,803 (7,033 ) 1,803 Gain on sale of unconsolidated joint venture interests — 762 — — 762 Income tax expense — — (7 ) — (7 ) Income (loss) from unconsolidated entities (2,764 ) 9,194 — (4,659 ) 1,771 791 1,000 (8,698 ) (4,659 ) (11,566 ) Net income (loss) $ 1,498 $ (1,476 ) $ 6,135 $ (4,659 ) $ 1,498
Consolidating Statements of Comprehensive Income	Consolidating Statements of Comprehensive Income (in thousands): For the Three Months Ended March 31, 2019 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Net income $ 3,513 $ 3,925 $ 10,459 $ (14,384 ) $ 3,513 Market value adjustments to interest rate swaps (1,431 ) (1,431 ) — 1,431 (1,431 ) Comprehensive income $ 2,082 $ 2,494 $ 10,459 $ (12,953 ) $ 2,082 For the Three Months Ended March 31, 2018 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Net income $ 1,498 $ (1,476 ) $ 6,135 $ (4,659 ) $ 1,498 Market value adjustments to interest rate swaps 2,514 2,514 — (2,514 ) 2,514 Comprehensive income $ 4,012 $ 1,038 $ 6,135 $ (7,173 ) $ 4,012
Consolidating Statements of Cash Flows	Consolidating Statements of Cash Flows (in thousands): For the Three Months Ended March 31, 2019 Columbia Property Trust (Guarantor) Columbia Property Trust OP (the Issuer) Non- Guarantors Consolidating Adjustments Columbia Property Trust Cash flows from operating activities $ 4,638 $ 2,948 $ 41,877 $ (14,384 ) $ 35,079 Cash flows from investing activities: Investment in real estate and related assets (13,701 ) — (20,951 ) — (34,652 ) Investments in unconsolidated joint ventures — (6,528 ) — — (6,528 ) Distributions from unconsolidated joint ventures — 5,672 — — 5,672 Distributions from subsidiaries 56,640 7,313 — (63,953 ) — Net cash provided by (used in) investing activities 42,939 6,457 (20,951 ) (63,953 ) (35,508 ) Cash flows from financing activities: Borrowings, net of fees — 73,979 — — 73,979 Repayments — (23,000 ) — — (23,000 ) Distributions (46,716 ) (59,189 ) (19,148 ) 78,337 (46,716 ) Repurchases of common stock (2,401 ) — — — (2,401 ) Net cash provided by (used in) financing activities (49,117 ) (8,210 ) (19,148 ) 78,337 1,862 Net increase (decrease) in cash and cash equivalents (1,540 ) 1,195 1,778 — 1,433 Cash and cash equivalents, beginning of period 1,705 10,573 4,840 — 17,118 Cash and cash equivalents, end of period $ 165 $ 11,768 $ 6,618 $ — $ 18,551 Condensed Consolidating Statements of Cash Flows (in thousands): For the Three Months Ended March 31, 2018 Columbia Property Trust (Guarantor) Columbia Property Trust OP (the Issuer) Non- Guarantors Consolidating Adjustments Columbia Property Trust Cash flows from operating activities $ 708 $ (5,326 ) $ 19,389 $ — $ 14,771 Cash flows from investing activities: Net proceeds from sale of investments in unconsolidated joint ventures — 235,083 — — 235,083 Investment in real estate and related assets — — (23,877 ) — (23,877 ) Investments in unconsolidated joint ventures — (1,541 ) — — (1,541 ) Distributions from unconsolidated joint ventures — 2,976 — — 2,976 Distributions from subsidiaries 75,935 (9,988 ) — (65,947 ) — Net cash provided by (used in) investing activities 75,935 226,530 (23,877 ) (65,947 ) 212,641 Cash flows from financing activities: Borrowings, net of fees — 108,983 — — 108,983 Repayments — (247,000 ) (814 ) — (247,814 ) Distributions (47,819 ) (77,811 ) 11,864 65,947 (47,819 ) Repurchases of common stock (29,261 ) — — — (29,261 ) Net cash provided by (used in) financing activities (77,080 ) (215,828 ) 11,050 65,947 (215,911 ) Net increase (decrease) in cash and cash equivalents (437 ) 5,376 6,562 — 11,501 Cash and cash equivalents, beginning of period 692 5,079 3,796 — 9,567 Cash and cash equivalents, end of period $ 255 $ 10,455 $ 10,358 $ — $ 21,068

Organization (Details)

Organization (Details) ft² in Millions	Mar. 31, 2019ft²property
Real Estate Properties [Line Items]
Square feet of real estate | ft²	8.9
Percent of leased office space of owned properties	97.10%
Office Building
Real Estate Properties [Line Items]
Number of real estate properties	18
Number of properties under development	2
Wholly Owned Properties | Office Building
Real Estate Properties [Line Items]
Number of real estate properties	14
Unconsolidated Properties | Office Building
Real Estate Properties [Line Items]
Number of real estate properties	6

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Property, Plant and Equipment [Line Items]
Capitalized interest costs to construction in progress	$ 900,000	$ 900,000
Hedge ineffectiveness recognized in earnings	$ 0	$ 0
Requirement to distribute taxable income (at least)	90.00%
Limit on investments in taxable real estate investment trusts (percent)	20.00%
Office Lease
Property, Plant and Equipment [Line Items]
Estimated useful life of real estate assets	40 years
Building and site improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life of real estate assets	5 years
Building and site improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life of real estate assets	25 years
Corporate Joint Venture
Property, Plant and Equipment [Line Items]
Capitalized interest costs to construction in progress	$ 300,000

Summary of Significant Accoun_5

Summary of Significant Accounting Policies (Assets and Liabilities Classified as Held For Sale) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Liabilities Held for Sale:
Total liabilities held for sale, net	$ 20,491	$ 0
One & Three Glenlake | Held for sale
Real Estate Assets, at Cost:
Land	13,989
Buildings and improvements, less accumulated depreciation of $46,118	104,030
Intangible lease assets, less accumulated amortization of $10,830	533
Construction in progress	26,794
Total real estate assets held for sale, net	145,346
Other Assets Held for Sale:
Tenant receivables	53
Straight-line rent receivable	7,700
Prepaid expenses and other assets	49
Intangible lease origination costs, less accumulated amortization of $7,109	350
Deferred lease costs, less accumulated amortization of $6,484	12,346
Total other assets held for sale, net	20,498
Liabilities Held for Sale:
Accounts payable, accrued expenses, and accrued capital expenditures	19,632
Deferred income	743
Intangible lease liabilities, less accumulated amortization of $380	116
Total liabilities held for sale, net	20,491
Building and improvements held for sale, accumulated depreciation	46,118
Intangible lease assets held for sale, accumulated amortization	10,830
Intangible lease origination costs held for sale, accumulated amortization	7,109
Deferred lease costs held for sale, accumulated amortization	6,484
Intangible lease liabilities, accumulated amortization	$ 380

Summary of Significant Accoun_6

Summary of Significant Accounting Policies (Schedule of Intangible Assets & Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Gross Intangible In-Place Lease Assets and Liabilities [Abstract]
Intangible Lease Assets, Accumulated Amortization	$ (74,807)	$ (84,881)
Intangible lease assets, net	64,250	98,540
Intangible Lease Origination Costs, Accumulated Amortization	(60,186)	(65,348)
Intangible Lease Origination Costs, Net	31,626	34,092
Below Market Lease, Gross	42,351	42,847
Below Market Lease, Accumulated Amortization	(22,812)	(21,766)
Below Market Lease, Net	19,539	21,081
Above-Market In-Place Lease Assets
Gross Intangible In-Place Lease Assets and Liabilities [Abstract]
Intangible Lease Assets, Gross	3,174	3,174
Intangible Lease Assets, Accumulated Amortization	(1,142)	(1,060)
Intangible lease assets, net	2,032	2,114
Absorption Period Costs
Gross Intangible In-Place Lease Assets and Liabilities [Abstract]
Intangible Lease Assets, Gross	135,883	147,668
Intangible Lease Assets, Accumulated Amortization	(73,665)	(81,220)
Intangible lease assets, net	62,218	66,448
Intangible Lease Origination Costs
Gross Intangible In-Place Lease Assets and Liabilities [Abstract]
Intangible Lease Origination Costs, Gross	91,812	99,440
Intangible Lease Origination Costs, Accumulated Amortization	(60,186)	(65,348)
Intangible Lease Origination Costs, Net	$ 31,626	$ 34,092

Summary of Significant Accoun_7

Summary of Significant Accounting Policies (Schedule of Recognized Amortization) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Lease Assets	$ 7,461	$ 8,016
Intangible Below-Market In-Place Lease Liabilities	1,426	1,589
Above-Market In-Place Lease Assets
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Lease Assets	82	51
Absorption Period Costs
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Lease Assets	3,656	4,339
Intangible Lease Origination Costs
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Lease Assets	$ 2,100	$ 2,419

Summary of Significant Accoun_8

Summary of Significant Accounting Policies (Schedule of Future Amortization by Intangible Asset Class) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
For the Years Ending December 31:
Intangible lease assets, net	$ 64,250	$ 98,540
Intangible Lease Origination Costs, Net	31,626	34,092
Intangible Below-Market In-Place Lease Liabilities
For the remainder of 2019	4,122
For the years ending December 31:
2020	4,597
2021	1,714
2022	1,374
2023	1,308
2024	1,162
Thereafter	5,262
Below Market Lease, Net	19,539	21,081
Above-Market In-Place Lease Assets
Finite-Lived Intangible Assets [Line Items]
For the remainder of 2019	246
For the Years Ending December 31:
2020	275
2021	247
2022	243
2023	243
2024	230
Thereafter	548
Intangible lease assets, net	2,032	2,114
Absorption Period Costs
Finite-Lived Intangible Assets [Line Items]
For the remainder of 2019	10,397
For the Years Ending December 31:
2020	12,338
2021	7,490
2022	5,848
2023	5,098
2024	4,756
Thereafter	16,291
Intangible lease assets, net	62,218	66,448
Intangible Lease Origination Costs
Finite-Lived Intangible Assets [Line Items]
For the remainder of 2019	5,963
For the Years Ending December 31:
2020	7,406
2021	3,429
2022	2,406
2023	2,165
2024	2,062
Thereafter	8,195
Intangible Lease Origination Costs, Net	$ 31,626	$ 34,092

Summary of Significant Accoun_9

Summary of Significant Accounting Policies (Interest Rate Swaps) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
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	$ (1,431)	$ 2,514
Interest rate contracts | Prepaid expenses and other assets
Derivative, Fair Value, Net [Abstract]
Derivative designated as hedging instruments	$ 913		$ 2,344

Real Estate Transactions (Sched

Real Estate Transactions (Schedule of Properties Acquired) (Details) - USD ($) $ in Thousands	Oct. 24, 2018	Oct. 03, 2018	Mar. 31, 2019	Mar. 31, 2018
Business Acquisition [Line Items]
Purchase Price			$ 6,528	$ 1,541
Lindbergh Center - Retail
Business Acquisition [Line Items]
Ownership Interest	100.00%
Purchase Price	$ 23,000
Corporate Joint Venture | 799 Broadway
Business Acquisition [Line Items]
Ownership Interest		49.70%	49.70%
Purchase Price		$ 30,200

Real Estate Transactions (Acqui

Real Estate Transactions (Acquisitions) (Details) ft² in Thousands	Oct. 24, 2018USD ($)ft²Tenant	Oct. 03, 2018USD ($)ft²	Mar. 31, 2019USD ($)ft²	Mar. 31, 2018USD ($)
Business Acquisition [Line Items]
Square feet of real estate | ft²			8,900
Payments to acquire interest in joint venture			$ 6,528,000	$ 1,541,000
Lindbergh Center - Retail
Business Acquisition [Line Items]
Ownership percentage	100.00%
Purchase price	$ 23,000,000
Number of tenants | Tenant	14
Ancillary retail and office building | Lindbergh Center - Retail
Business Acquisition [Line Items]
Square feet of real estate | ft²	147
Customer Concentration Risk | Lindbergh Center - Retail
Business Acquisition [Line Items]
Concentration risk, percentage	91.00%
Pike Nurseries | Customer Concentration Risk | Lindbergh Center - Retail
Business Acquisition [Line Items]
Concentration risk, percentage	18.00%
Corporate Joint Venture | 799 Broadway Joint Venture
Business Acquisition [Line Items]
Payments to acquire interest in joint venture		$ 30,200,000
Ownership percentage		49.70%	49.70%
Corporate Joint Venture | 799 Broadway Joint Venture | Office Building
Business Acquisition [Line Items]
Square feet of real estate | ft²		182
Corporate Joint Venture | Normandy | 799 Broadway Joint Venture
Business Acquisition [Line Items]
Contribution of property to joint venture		$ 145,500,000
Corporate Joint Venture | 799 Broadway Joint Venture
Business Acquisition [Line Items]
Amount borrowed under construction loan		97,000,000	$ 103,100,000
Construction loan | Corporate Joint Venture | 799 Broadway Joint Venture
Business Acquisition [Line Items]
Maximum borrowing capacity		$ 187,000,000

Real Estate Transactions (Purch

Real Estate Transactions (Purchase Price Allocation) (Details) $ in Thousands	Oct. 24, 2018USD ($)
Business Acquisition [Line Items]
Total purchase price	$ 23,363
Lindbergh Center - Retail
Business Acquisition [Line Items]
Building and improvements	17,558
Intangible below market lease liability	(715)
Intangible lease assets | Lindbergh Center - Retail
Business Acquisition [Line Items]
Intangible lease	5,726
Intangible lease origination costs | Lindbergh Center - Retail
Business Acquisition [Line Items]
Intangible lease	$ 794

Real Estate Transactions (Pro F

Real Estate Transactions (Pro Forma) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Real Estate [Abstract]
Revenues	$ 74,458
Net income	$ 1,521

Real Estate Transactions (Prope

Real Estate Transactions (Properties Sold) (Details) - Disposed of by Sale - USD ($) $ in Thousands	May 29, 2018	Apr. 13, 2018	Feb. 01, 2018	Jul. 06, 2017
222 East 41st Street
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
% Sold	100.00%
Sales Price	$ 332,500
Gain on Sale	$ 0
263 Shuman Boulevard
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
% Sold		100.00%
Sales Price		$ 49,000
Gain on Sale		$ 24,000
University Circle & 333 Market Street
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
% Sold			22.50%	22.50%
Sales Price			$ 235,300
Gain on Sale			$ 800

Real Estate Transactions (Dispo

Real Estate Transactions (Dispositions) (Details) - USD ($) $ in Thousands	May 29, 2018	Apr. 13, 2018	Feb. 01, 2018	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Apr. 15, 2019	Jan. 31, 2018	Jul. 06, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from sale of investments in unconsolidated joint ventures				$ 0		$ 235,083
Gain on sale of unconsolidated joint venture interests				$ 0		$ 762
Disposed of by Sale | 222 East 41st Street
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration transferred	$ 332,500
Impairment loss on real estate assets					$ 30,800
Interests sold	100.00%
Disposed of by Sale | University Circle & 333 Market Street
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration transferred			$ 235,300
Interests sold			22.50%						22.50%
Bridge Loan | $300 Million Bridge Loan
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Repayment of debt	$ 180,000
Mortgage Notes | 263 Shuman Boulevard building mortgage note
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Extinguishment of loan principal		$ 49,000
Gain on extinguishment of debt		$ 24,000
Corporate Joint Venture | University Circle & 333 Market Street
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from sale of investments in unconsolidated joint ventures			$ 235,300
Gain on sale of unconsolidated joint venture interests			$ 800
Ownership percentage			55.00%	55.00%				77.50%
Subsequent Event | Disposed of by Sale | One & Three Glenlake
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration transferred							$ 227,500

Unconsolidated Joint Ventures_2

Unconsolidated Joint Ventures (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Oct. 03, 2018
Schedule of Equity Method Investments [Line Items]
Interest capitalized	$ 1,200
Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Carrying Value of Investment	$ 1,067,905	$ 1,071,353
Corporate Joint Venture | Market Square Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership Interest	51.00%
Carrying Value of Investment	$ 137,825	134,250
Corporate Joint Venture | University Circle Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership Interest	55.00%
Carrying Value of Investment	$ 291,159	292,951
Corporate Joint Venture | 333 Market Street Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership Interest	55.00%
Carrying Value of Investment	$ 272,519	273,783
Corporate Joint Venture | 114 Fifth Avenue Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership Interest	49.50%
Carrying Value of Investment	$ 96,059	99,283
Corporate Joint Venture | 1800 M Street Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership Interest	55.00%
Carrying Value of Investment	$ 234,837	237,333
Corporate Joint Venture | 799 Broadway Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership Interest	49.70%		49.70%
Carrying Value of Investment	$ 35,506	$ 33,753
Interest capitalized	$ 300

Unconsolidated Joint Ventures_3

Unconsolidated Joint Ventures (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)joint_venture	Mar. 31, 2018USD ($)	Dec. 31, 2018USD ($)
Related Party Transaction [Line Items]
Number of joint ventures that qualify as variable interest entities | joint_venture	0
Cash paid for lease	$ 625
Property operating costs
Related Party Transaction [Line Items]
Reimbursements of property operating costs	1,869	$ 1,759
Property operating costs | Other property income | Corporate Joint Venture
Related Party Transaction [Line Items]
Reimbursements of property operating costs	1,200	$ 1,000
Prepaid expenses and other assets | Corporate Joint Venture
Related Party Transaction [Line Items]
Property management fee receivable	600		$ 700
Market Square Joint Venture | Corporate Joint Venture
Related Party Transaction [Line Items]
Cash paid for lease	37
799 Broadway Joint Venture | Corporate Joint Venture
Related Party Transaction [Line Items]
Cash received for lease	$ 30

Unconsolidated Joint Ventures_4

Unconsolidated Joint Ventures (Condensed Balance Sheet Information for Joint Ventures) (Details)	Oct. 03, 2018USD ($)extension	Mar. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Schedule of Equity Method Investments [Line Items]
Deferred financing costs, net		$ 2,544,000	$ 2,692,000
Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Total assets		2,294,884,000	2,176,751,000
Total debt		422,905,000	420,392,000
Total equity		1,462,684,000	1,467,334,000
Corporate Joint Venture | Market Square Joint Venture
Schedule of Equity Method Investments [Line Items]
Total assets		586,797,000	582,176,000
Total debt		324,775,000	324,762,000
Total equity		248,004,000	241,581,000
Corporate Joint Venture | University Circle Joint Venture
Schedule of Equity Method Investments [Line Items]
Total assets		225,398,000	224,746,000
Total debt		0	0
Total equity		218,753,000	219,390,000
Corporate Joint Venture | 333 Market Street Joint Venture
Schedule of Equity Method Investments [Line Items]
Total assets		372,814,000	375,884,000
Total debt		0	0
Total equity		358,452,000	360,915,000
Corporate Joint Venture | 114 Fifth Avenue Joint Venture
Schedule of Equity Method Investments [Line Items]
Total assets		498,686,000	377,970,000
Total debt		0	0
Total equity		143,138,000	149,243,000
Corporate Joint Venture | 1800 M Street Joint Venture
Schedule of Equity Method Investments [Line Items]
Total assets		441,114,000	447,585,000
Total debt		0	0
Total equity		424,501,000	429,016,000
Corporate Joint Venture | 799 Broadway Joint Venture
Schedule of Equity Method Investments [Line Items]
Total assets		170,075,000	168,390,000
Total debt		98,130,000	95,630,000
Total equity		69,836,000	67,189,000
Corporate Joint Venture | Market Square, University Circle, 333 Market Street, 114 Fifth Avenue, 1800 M Street And 799 Broadway Joint Ventures
Schedule of Equity Method Investments [Line Items]
Aggregate basis difference		281,200,000	$ 282,000,000
Blackstone Property Partners | Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Debt		$ 325,000,000
Mortgage note interest rate		5.07%
799 Broadway Joint Venture | Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Amount borrowed under construction loan	$ 97,000,000	$ 103,100,000
Deferred financing costs, net		$ 5,000,000
LIBOR (maximum)	4.00%
Construction loan | 799 Broadway Joint Venture | Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity	$ 187,000,000
Number of extensions available | extension	2
Extension term	1 year
LIBOR | 799 Broadway Joint Venture | Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Basis spread	42500.00%

Unconsolidated Joint Ventures_5

Unconsolidated Joint Ventures (Condensed Income Statement Information for the Joint Ventures) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Schedule of Equity Method Investments [Line Items]
Columbia Property Trust's Share of Net Income (Loss)	$ 1,771	$ 1,771
Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Total Revenues	50,036	47,221
Net Income (Loss)	4,838	3,965
Columbia Property Trust's Share of Net Income (Loss)	2,931	3,101
Corporate Joint Venture | Market Square Joint Venture
Schedule of Equity Method Investments [Line Items]
Total Revenues	11,337	11,015
Net Income (Loss)	(2,595)	(3,009)
Columbia Property Trust's Share of Net Income (Loss)	(1,323)	(1,534)
Corporate Joint Venture | University Circle Joint Venture
Schedule of Equity Method Investments [Line Items]
Total Revenues	11,272	10,341
Net Income (Loss)	6,364	5,505
Columbia Property Trust's Share of Net Income (Loss)	3,500	3,429
Corporate Joint Venture | 333 Market Street Joint Venture
Schedule of Equity Method Investments [Line Items]
Total Revenues	7,054	6,668
Net Income (Loss)	3,713	3,557
Columbia Property Trust's Share of Net Income (Loss)	2,042	2,227
Corporate Joint Venture | 114 Fifth Avenue Joint Venture
Schedule of Equity Method Investments [Line Items]
Total Revenues	10,919	10,300
Net Income (Loss)	(2,506)	(2,331)
Columbia Property Trust's Share of Net Income (Loss)	(1,240)	(1,154)
Corporate Joint Venture | 1800 M Street Joint Venture
Schedule of Equity Method Investments [Line Items]
Total Revenues	9,454	8,897
Net Income (Loss)	388	243
Columbia Property Trust's Share of Net Income (Loss)	214	133
Corporate Joint Venture | 799 Broadway Joint Venture
Schedule of Equity Method Investments [Line Items]
Total Revenues	0	0
Net Income (Loss)	(526)	0
Columbia Property Trust's Share of Net Income (Loss)	$ (262)	$ 0

Unconsolidated Joint Ventures_6

Unconsolidated Joint Ventures (Asset and Property Management Fees) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Schedule of Equity Method Investments [Line Items]
Asset and property management fee income	$ 1,900	$ 1,800
Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Asset and property management fee income	1,869	1,759
Market Square Joint Venture | Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Asset and property management fee income	568	523
University Circle Joint Venture | Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Asset and property management fee income	574	529
333 Market Street Joint Venture | Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Asset and property management fee income	207	197
1800 M Street Joint Venture | Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Asset and property management fee income	$ 520	$ 510

Line of Credit and Notes Paya_3

Line of Credit and Notes Payable (Schedule of Long-Term Debt (excluding Bonds Payable)) (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Lines of credit and notes payable, net	$ 680,456,000	$ 629,308,000
Less: Deferred financing costs related to term loans and notes payable, net of accumulated amortization	(2,544,000)	(2,692,000)
Credit Facilities | Revolving Credit Facility
Debt Instrument [Line Items]
Lines of credit and notes payable, net	533,000,000	482,000,000
Term Loans
Debt Instrument [Line Items]
Less: Deferred financing costs related to term loans and notes payable, net of accumulated amortization	(2,544,000)	(2,692,000)
Term Loans | $150 Million Term Loan
Debt Instrument [Line Items]
Lines of credit and notes payable, net	150,000,000	150,000,000
Face amount of issued debt instrument	$ 150,000,000	$ 150,000,000

Line of Credit and Notes Paya_4

Line of Credit and Notes Payable (Narrative) (Details)	Dec. 07, 2018USD ($)extension	Mar. 31, 2019USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2018USD ($)	Jul. 30, 2015USD ($)
Debt Instrument [Line Items]
Interest capitalized		$ 1,200,000
Capitalized interest costs		$ 900,000	$ 900,000
Weighted average interest rate		3.59%
Credit Facilities | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 650,000,000				$ 500,000,000
Number of possible extensions | extension	2
Term of extension	6 months
Term Loans | $300 Million Term Loan
Debt Instrument [Line Items]
Face amount of issued debt instrument					$ 300,000,000
Term Loans | $150 Million Term Loan
Debt Instrument [Line Items]
Face amount of issued debt instrument		$ 150,000,000		$ 150,000,000
Loans Payable
Debt Instrument [Line Items]
Estimated fair value of line of credit and notes payable		683,100,000		632,100,000
Carrying value of the line of credit and notes payable		683,000,000		$ 632,000,000
Interest payments		5,600,000	6,300,000
Interest capitalized			$ 900,000
Minimum | Base Rate | Credit Facilities | Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread	0.00%
Minimum | Base Rate | Term Loans | $300 Million Term Loan
Debt Instrument [Line Items]
Basis spread	0.00%
Minimum | LIBOR | Credit Facilities | Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread	0.775%
Minimum | LIBOR | Term Loans | $300 Million Term Loan
Debt Instrument [Line Items]
Basis spread	0.85%
Maximum | Base Rate | Credit Facilities | Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread	0.45%
Maximum | Base Rate | Term Loans | $300 Million Term Loan
Debt Instrument [Line Items]
Basis spread	0.65%
Maximum | LIBOR | Credit Facilities | Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread	1.45%
Maximum | LIBOR | Term Loans | $300 Million Term Loan
Debt Instrument [Line Items]
Basis spread	1.65%
Corporate Joint Venture
Debt Instrument [Line Items]
Capitalized interest costs		$ 300,000

Bonds Payable (Details)

Bonds Payable (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2019USD ($)bond_series	Mar. 31, 2018USD ($)	Dec. 31, 2018USD ($)bond_series
Debt Instrument [Line Items]
Number of series of bonds | bond_series	2		2
Bonds payable, net	$ 694,736,000		$ 694,538,000
Bonds Payable | 2026 and 2025 Bonds Payable
Debt Instrument [Line Items]
Interest payments	6,400,000	$ 6,400,000
Bonds Payable | 2026 and 2025 Bonds Payable | Level 2
Debt Instrument [Line Items]
Estimated fair value of debt instrument	695,100,000		685,000,000
Bonds payable, net	698,700,000		698,700,000
Bonds Payable | 2026 Bonds Payable
Debt Instrument [Line Items]
Face amount of issued debt instrument	$ 350,000,000		$ 350,000,000
Maturity of debt instrument	10 years		10 years
Interest rate for debt instrument (percent)	3.65%		3.65%
Discount rate of face value of issued debt instrument (percent)	99.626%		99.626%
Bonds Payable | 2025 Bonds Payable
Debt Instrument [Line Items]
Face amount of issued debt instrument	$ 350,000,000		$ 350,000,000
Maturity of debt instrument	10 years		10 years
Interest rate for debt instrument (percent)	4.15%		4.15%
Discount rate of face value of issued debt instrument (percent)	99.859%		99.859%

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($)	Oct. 03, 2018	Mar. 31, 2019	Apr. 25, 2019
Market Square Joint Venture | Corporate Joint Venture
Loss Contingencies [Line Items]
Mortgage guaranty		$ 4,000,000
799 Broadway Joint Venture | Corporate Joint Venture
Loss Contingencies [Line Items]
Mortgage guaranty		23,700,000
Guaranty liability		0
Capital calls unpaid		0
Blackstone Property Partners | Corporate Joint Venture
Loss Contingencies [Line Items]
Debt		325,000,000
799 Broadway Joint Venture | Corporate Joint Venture
Loss Contingencies [Line Items]
Amount borrowed under construction loan	$ 97,000,000	103,100,000
Columbia Property Trust and joint venturer | 799 Broadway Joint Venture | Corporate Joint Venture
Loss Contingencies [Line Items]
Mortgage guaranty		47,700,000
149 Madison Avenue
Loss Contingencies [Line Items]
Unrecorded tenant allowance commitments		$ 28,300,000
Subsequent Event | Market Square Joint Venture | Corporate Joint Venture
Loss Contingencies [Line Items]
Mortgage guaranty			$ 0

Stockholders' Equity (Narrative

Stockholders' Equity (Narrative) (Details) - USD ($)	Jan. 01, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 04, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, par value (dollars per share)		$ 0.01	$ 0.01
Unrecognized compensation costs related to unvested awards		$ 13,600,000	$ 8,600,000
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs recognition period (years)		1 year
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs recognition period (years)		4 years
2013 Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares)		4,800,000
Common Stock | 2017 Stock Repurchase Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount				$ 200,000,000
Common stock, par value (dollars per share)				$ 0.01
Stock repurchase program, amount available for repurchase		$ 124,400,000
Time-based Stock Awards | Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)	175,129
Vesting period	4 years
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)		256,000	35,000
RSUs | Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)	221,199
Performance period	3 years
RSUs | Long Term Incentive Plan | End of Performance Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights (percent)	75.00%
RSUs | Long Term Incentive Plan | 1 Year Post Performance Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights (percent)	25.00%

Stockholders' Equity (Unvested

Stockholders' Equity (Unvested Activity Rollforward) (Details) - $ / shares	3 Months Ended	24 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Weighted-Average, Grant-Date Fair Value Rollforward
Expected forfeiture rate	3.80%
Restricted Stock [Member]
Shares Rollforward
Unvested awards - beginning of period (shares)	375,000
Granted (shares)	175,000
Vested (shares)	(165,000)
Forfeited (shares)	0
Unvested awards - end of period (shares)	385,000	375,000
Weighted-Average, Grant-Date Fair Value Rollforward
Unvested awards - beginning of period (dollars per share)	$ 22.15
Granted (dollars per share)	19.35
Vested (dollars per share)	21.98
Forfeited (dollars per share)	0
Unvested awards - end of period (dollars per share)	$ 20.95	$ 22.15
Shares granted	175,000
Shares expected to ultimately vest	370,000
RSUs
Shares Rollforward
Unvested awards - beginning of period (shares)	454,000
Granted (shares)	256,000	35,000
Vested (shares)	(121,000)
Forfeited (shares)	0
Unvested awards - end of period (shares)	589,000	454,000
Weighted-Average, Grant-Date Fair Value Rollforward
Unvested awards - beginning of period (dollars per share)	$ 19.37
Granted (dollars per share)	17.66
Vested (dollars per share)	19.08
Forfeited (dollars per share)	0
Unvested awards - end of period (dollars per share)	$ 18.77	$ 19.37
Shares granted	256,000	35,000
Shares expected to ultimately vest	566,000

Stockholders' Equity (Stock-bas

Stockholders' Equity (Stock-based Compensation Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 1,539	$ 1,528
Future employee awards	655	492
Employees
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 884	$ 1,036

Supplemental Disclosures of N_3

Supplemental Disclosures of Noncash Investing and Financing Activities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Amortization of net discounts on debt	$ 45	$ 45
Accrued investments in unconsolidated joint ventures	88	0
Accrued capital expenditures and deferred lease costs	19,603	12,414
Operating lease liability recorded at adoption of ASC 842	34,791	0
Market value adjustments to interest rate swaps that qualify for hedge accounting treatment	(1,431)	2,514
Amortization of common stock issued to employees and directors	1,539	1,528
ASU 2017-05
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment to equity for the adoption of ASU 2017-05, Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Non-Financial Assets	$ 0	$ 357,755	$ 357,755

Leases - Additional Information

Leases - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)ground_lease
Lessee, Lease, Description [Line Items]
Operating lease, number of ground leases | ground_lease	3
Operating lease assets	$ 63,829
Operating lease liabilities	$ 34,738
Lessor, operating lease, weighted-average remaining lease term	6 years 10 months 24 days
Minimum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, right-of-use asset, term of contract	58 years
Lessee, operating lease, liability, term of contract	80 years
Maximum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, right-of-use asset, term of contract	111 years
Lessee, operating lease, liability, term of contract	111 years

Leases - Future Rental Payments

Leases - Future Rental Payments to be Made (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Operating Leases, Future Minimum Payments Due
Remainder of 2019	$ 1,877
2020	2,539
2021	2,704
2022	2,743
2023	2,023
2024	1,962
Thereafter	174,821
Total lease payments	188,669
Less: interest expense	(153,931)
Present value of lease liabilities	$ 34,738
Weighted-average remaining lease term (years)	76 years
Weighted-average discount rate	6.60%
Operating Leases, Future Minimum Payments Due
2019		$ 2,502
2020		2,539
2021		2,704
2022		2,743
2023		2,023
Thereafter		176,782
Total		$ 189,293

Leases - Impacts on Consolidate

Leases - Impacts on Consolidated Balance Sheet (Details) $ in Thousands	Mar. 31, 2019USD ($)
Lessee, Lease, Description [Line Items]
Operating lease assets	$ 63,829
Operating lease liabilities	34,738
Ground Leases
Lessee, Lease, Description [Line Items]
Operating lease assets	61,849
Operating lease liabilities	32,112
Office Lease
Lessee, Lease, Description [Line Items]
Operating lease assets	1,980
Operating lease liabilities	$ 2,626

Leases - Impacts on Consolida_2

Leases - Impacts on Consolidated Income Statement (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Lessee, Lease, Description [Line Items]
Operating lease expenses	$ 837
Property operating costs
Lessee, Lease, Description [Line Items]
Operating lease expenses	692
General and administrative – corporate
Lessee, Lease, Description [Line Items]
Operating lease expenses	145
Ground Leases
Lessee, Lease, Description [Line Items]
Operating lease expenses	692
Ground Leases | Property operating costs
Lessee, Lease, Description [Line Items]
Operating lease expenses	692
Ground Leases | General and administrative – corporate
Lessee, Lease, Description [Line Items]
Operating lease expenses	0
Office Lease
Lessee, Lease, Description [Line Items]
Operating lease expenses	145
Office Lease | Property operating costs
Lessee, Lease, Description [Line Items]
Operating lease expenses	0
Office Lease | General and administrative – corporate
Lessee, Lease, Description [Line Items]
Operating lease expenses	$ 145

Leases Leases - Impacts on Cons

Leases Leases - Impacts on Consolidated Statement of Cash Flows (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Lessee, Lease, Description [Line Items]
Cash paid for operating lease liabilities in cash flows from operations	$ (625)
Ground Leases
Lessee, Lease, Description [Line Items]
Cash paid for operating lease liabilities in cash flows from operations	(451)
Office Lease
Lessee, Lease, Description [Line Items]
Cash paid for operating lease liabilities in cash flows from operations	$ (174)

Leases - Fixed and Variable Rev

Leases - Fixed and Variable Revenues (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Leases [Abstract]
Fixed payments	$ 65,517
Variable payments	6,345
Total rental income and tenant reimbursements	$ 71,862

Leases - Future Rental Paymen_2

Leases - Future Rental Payments to be Received (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Remainder of 2019	$ 184,860
2020	251,836
2021	225,294
2022	213,492
2023	196,011
2024	183,205
Thereafter	939,626
Total	$ 2,194,324
2019		$ 242,370
2020		247,826
2021		221,692
2022		209,845
2023		192,261
Thereafter		1,106,275
Total		$ 2,220,269

Non-Lease Revenues (Details)

Non-Lease Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Asset and property management fee income	$ 1,900	$ 1,800
Leasing override fee income	3
Salary and other reimbursement revenue	1,100	1,000
Miscellaneous revenue	$ 200	$ 200

Earnings Per Share (Basic and D

Earnings Per Share (Basic and Diluted EPS Computations) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 3,513	$ 1,498
Distributions paid on unvested shares	(77)	(73)
Net income used to calculate basic and diluted earnings per share	$ 3,436	$ 1,425
Weighted-average common shares – basic	116,462	119,082
Weighted-average common shares – diluted	116,880	119,350
Previously granted awards, unvested
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Plus incremental weighted-average shares from time-vested conversions, less assumed stock repurchases	90	70
Future period LTI Plan awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Plus incremental weighted-average shares from time-vested conversions, less assumed stock repurchases	328	198

Segment Information (Operating

Segment Information (Operating Revenues by Geographic Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Feb. 01, 2018	Jan. 31, 2018
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	$ 102,109	$ 98,166
Operating revenues	75,433	73,710
Asset and property management fee income	(1,900)	(1,800)
Operating Segments
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	101,323	97,485
Operating Segments | New York
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	38,696	40,909
Operating Segments | San Francisco
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	27,763	23,520
Operating Segments | Atlanta
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	11,223	9,858
Operating Segments | Washington, D.C.
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	14,130	13,972
Operating Segments | Boston
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	3,674	3,370
Operating Segments | Los Angeles
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	1,934	1,920
Operating Segments | All other office markets
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	3,903	3,936
Corporate
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	786	681
Eliminations
Segment Reporting Information [Line Items]
Operating revenues	28,545	26,215
Asset and property management fee income	(1,869)	(1,759)
Corporate Joint Venture
Segment Reporting Information [Line Items]
Asset and property management fee income	$ (1,869)	(1,759)
114 Fifth Avenue Joint Venture | Corporate Joint Venture
Segment Reporting Information [Line Items]
Ownership percentage	49.50%
333 Market Street and University Circle | Corporate Joint Venture
Segment Reporting Information [Line Items]
Ownership percentage	55.00%		55.00%	77.50%
Market Square Joint Venture | Corporate Joint Venture
Segment Reporting Information [Line Items]
Ownership percentage	51.00%
Asset and property management fee income	$ (568)	(523)
1800 M Street Joint Venture | Corporate Joint Venture
Segment Reporting Information [Line Items]
Ownership percentage	55.00%
Asset and property management fee income	$ (520)	$ (510)

Segment Information (Net Operat

Segment Information (Net Operating Income By Geographic Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Oct. 03, 2018	Feb. 01, 2018	Jan. 31, 2018
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	$ 66,646	$ 66,859
Operating Segments
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	66,851	67,084
Operating Segments | New York
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	22,806	24,179
Operating Segments | San Francisco
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	20,497	19,554
Operating Segments | Atlanta
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	8,151	8,754
Operating Segments | Washington, D.C.
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	8,453	8,330
Operating Segments | Boston
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	1,989	1,768
Operating Segments | Los Angeles
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	1,119	1,208
Operating Segments | All other office markets
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	3,836	3,291
Corporate
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	$ (205)	$ (225)
114 Fifth Avenue Joint Venture | Corporate Joint Venture
Segment Reporting Information [Line Items]
Ownership percentage	49.50%
799 Broadway Joint Venture | Corporate Joint Venture
Segment Reporting Information [Line Items]
Ownership percentage	49.70%		49.70%
333 Market Street and University Circle | Corporate Joint Venture
Segment Reporting Information [Line Items]
Ownership percentage	55.00%			55.00%	77.50%
Market Square Joint Venture | Corporate Joint Venture
Segment Reporting Information [Line Items]
Ownership percentage	51.00%
1800 M Street Joint Venture | Corporate Joint Venture
Segment Reporting Information [Line Items]
Ownership percentage	55.00%

Segment Information (Reconcilia

Segment Information (Reconciliation of GAAP Net Income to NOI) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Net income	$ 3,513	$ 1,498
Depreciation	20,404	20,835
General and administrative – corporate	8,424	7,794
General and administrative – unconsolidated joint ventures	809	731
Gain on sale of unconsolidated joint venture interests	0	(762)
Income tax expense	7	7
Asset and property management fee income	(1,900)	(1,800)
NOI	66,646	66,859
Segment Reconciling Items
Segment Reporting Information [Line Items]
Depreciation	20,404	20,835
Amortization	7,461	8,016
General and administrative – corporate	8,424	7,794
General and administrative – unconsolidated joint ventures	809	731
Net interest expense	12,094	15,892
Interest income from development authority bonds	0	(1,800)
Gain on sale of unconsolidated joint venture interests	0	(762)
Income tax expense	7	7
Asset and property management fee income	(1,869)	(1,759)
Adjustments included in income from unconsolidated joint ventures	$ 15,803	$ 16,407

Financial Information for Par_3

Financial Information for Parent Guarantor, Issuer Subsidiary, and Non-Guarantor Subsidiaries (Narrative) (Details)	Mar. 31, 2019
Condensed Financial Information Disclosure [Abstract]
Ownership percentage of wholly owned subsidiary	100.00%

Financial Information for Par_4

Financial Information for Parent Guarantor, Issuer Subsidiary, and Non-Guarantor Subsidiaries (Condensed Consolidating Balance Sheets) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Assets:
Land	$ 803,986	$ 817,975
Buildings and improvements, net	1,791,926	1,910,041
Intangible lease assets, net	64,250	98,540
Construction in progress	37,772	33,800
Real estate assets held for sale, net	145,346	0
Total real estate assets	2,843,280	2,860,356
Operating lease assets	63,829
Investments in unconsolidated joint ventures	1,067,905	1,071,353
Cash and cash equivalents	18,551	17,118	$ 21,068	$ 9,567
Investment in subsidiaries	0	0
Tenant receivables	3,760	3,258
Straight-line rent receivable	83,828	87,159
Prepaid expenses and other assets	31,520	23,218
Intangible lease origination costs, net	31,626	34,092
Deferred lease costs, net	58,932	77,439
Other assets held for sale	20,498	0
Total assets	4,223,729	4,173,993
Liabilities:
Lines of credit and notes payable, net	680,456	629,308
Bonds payable, net	694,736	694,538
Operating lease liabilities	34,738
Accounts payable, accrued expenses, and accrued capital expenditures	37,962	49,117
Dividends payable	0	23,340
Due to affiliates	0	0
Deferred income	16,943	15,593
Intangible lease liabilities, net	19,539	21,081
Liabilities held for sale	20,491	0
Total liabilities	1,504,865	1,432,977
Equity:
Total equity	2,718,864	2,741,016	$ 2,842,459	$ 2,531,936
Total liabilities and equity	4,223,729	4,173,993
Reportable Legal Entities | Columbia Property Trust (Parent) (Guarantor)
Assets:
Land	0	0
Buildings and improvements, net	0	0
Intangible lease assets, net	0	0
Construction in progress	0	0
Real estate assets held for sale, net	0
Total real estate assets	0	0
Operating lease assets	1,980
Investments in unconsolidated joint ventures	0	0
Cash and cash equivalents	165	1,705
Investment in subsidiaries	2,578,461	2,622,528
Tenant receivables	0	0
Straight-line rent receivable	0	0
Prepaid expenses and other assets	140,890	140,797
Intangible lease origination costs, net	0	0
Deferred lease costs, net	0	0
Other assets held for sale	0
Total assets	2,721,496	2,765,030
Liabilities:
Lines of credit and notes payable, net	0	0
Bonds payable, net	0	0
Operating lease liabilities	2,626
Accounts payable, accrued expenses, and accrued capital expenditures	6	674
Dividends payable		23,340
Due to affiliates	0	0
Deferred income	0	0
Intangible lease liabilities, net	0	0
Liabilities held for sale	0
Total liabilities	2,632	24,014
Equity:
Total equity	2,718,864	2,741,016
Total liabilities and equity	2,721,496	2,765,030
Reportable Legal Entities | Columbia Property Trust OP (the Issuer)
Assets:
Land	0	0
Buildings and improvements, net	1,633	1,739
Intangible lease assets, net	0	0
Construction in progress	0	0
Real estate assets held for sale, net	0
Total real estate assets	1,633	1,739
Operating lease assets	0
Investments in unconsolidated joint ventures	1,067,905	1,071,353
Cash and cash equivalents	11,768	10,573
Investment in subsidiaries	1,202,861	1,236,982
Tenant receivables	0	0
Straight-line rent receivable	0	0
Prepaid expenses and other assets	352,349	340,071
Intangible lease origination costs, net	0	0
Deferred lease costs, net	0	0
Other assets held for sale	0
Total assets	2,636,516	2,660,718
Liabilities:
Lines of credit and notes payable, net	680,456	629,308
Bonds payable, net	694,736	694,538
Operating lease liabilities	0
Accounts payable, accrued expenses, and accrued capital expenditures	10,628	9,441
Dividends payable		0
Due to affiliates	0	0
Deferred income	0	0
Intangible lease liabilities, net	0	0
Liabilities held for sale	0
Total liabilities	1,385,820	1,333,287
Equity:
Total equity	1,250,696	1,327,431
Total liabilities and equity	2,636,516	2,660,718
Reportable Legal Entities | Non- Guarantors
Assets:
Land	803,986	817,975
Buildings and improvements, net	1,790,293	1,908,302
Intangible lease assets, net	64,250	98,540
Construction in progress	37,772	33,800
Real estate assets held for sale, net	145,346
Total real estate assets	2,841,647	2,858,617
Operating lease assets	61,849
Investments in unconsolidated joint ventures	0	0
Cash and cash equivalents	6,618	4,840
Investment in subsidiaries	0	0
Tenant receivables	3,760	3,258
Straight-line rent receivable	83,828	87,159
Prepaid expenses and other assets	7,309	11,379
Intangible lease origination costs, net	31,626	34,092
Deferred lease costs, net	58,932	77,439
Other assets held for sale	20,498
Total assets	3,116,067	3,076,784
Liabilities:
Lines of credit and notes payable, net	467,344	467,344
Bonds payable, net	0	0
Operating lease liabilities	32,112
Accounts payable, accrued expenses, and accrued capital expenditures	27,328	39,007
Dividends payable		0
Due to affiliates	1,684	1,680
Deferred income	16,943	15,593
Intangible lease liabilities, net	19,539	21,081
Liabilities held for sale	20,491
Total liabilities	585,441	544,705
Equity:
Total equity	2,530,626	2,532,079
Total liabilities and equity	3,116,067	3,076,784
Consolidating Adjustments
Assets:
Land	0	0
Buildings and improvements, net	0	0
Intangible lease assets, net	0	0
Construction in progress	0	0
Real estate assets held for sale, net	0
Total real estate assets	0	0
Operating lease assets	0
Investments in unconsolidated joint ventures	0	0
Cash and cash equivalents	0	0
Investment in subsidiaries	(3,781,322)	(3,859,510)
Tenant receivables	0	0
Straight-line rent receivable	0	0
Prepaid expenses and other assets	(469,028)	(469,029)
Intangible lease origination costs, net	0	0
Deferred lease costs, net	0	0
Other assets held for sale	0
Total assets	(4,250,350)	(4,328,539)
Liabilities:
Lines of credit and notes payable, net	(467,344)	(467,344)
Bonds payable, net	0	0
Operating lease liabilities	0
Accounts payable, accrued expenses, and accrued capital expenditures	0	(5)
Dividends payable		0
Due to affiliates	(1,684)	(1,680)
Deferred income	0	0
Intangible lease liabilities, net	0	0
Liabilities held for sale	0
Total liabilities	(469,028)	(469,029)
Equity:
Total equity	(3,781,322)	(3,859,510)
Total liabilities and equity	$ (4,250,350)	$ (4,328,539)

Financial Information for Par_5

Financial Information for Parent Guarantor, Issuer Subsidiary, and Non-Guarantor Subsidiaries (Consolidating Statements of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues:
Revenues	$ 71,862
Revenues	75,433	$ 73,710
Expenses:
Depreciation	20,404	20,835
Amortization	7,461	8,016
General and administrative – corporate	8,424	7,794
General and administrative – unconsolidated joint ventures	809	731
Costs and expenses	61,590	60,646
Other Income (Expense):
Interest expense	(12,095)	(15,895)
Interest and other income	1	1,803
Gain on sale of unconsolidated joint venture interests	0	762
Income tax expense	(7)	(7)
Gain on sale of real estate assets	1,771	1,771
Nonoperating income (expense)	(10,330)	(11,566)
Net income	3,513	1,498
Reportable Legal Entities | Columbia Property Trust (Parent) (Guarantor)
Revenues:
Revenues	912	905
Expenses:
Depreciation	0	0
Amortization	0	0
General and administrative – corporate	199	198
General and administrative – unconsolidated joint ventures	0	0
Costs and expenses	199	198
Other Income (Expense):
Interest expense	0	0
Interest and other income	1,575	3,555
Gain on sale of unconsolidated joint venture interests		0
Income tax expense	0	0
Gain on sale of real estate assets	1,225	(2,764)
Nonoperating income (expense)	2,800	791
Net income	3,513	1,498
Reportable Legal Entities | Columbia Property Trust OP (the Issuer)
Revenues:
Revenues	0	0
Expenses:
Depreciation	171	167
Amortization	0	0
General and administrative – corporate	2,220	2,309
General and administrative – unconsolidated joint ventures	0	0
Costs and expenses	2,391	2,476
Other Income (Expense):
Interest expense	(12,095)	(12,434)
Interest and other income	3,478	3,478
Gain on sale of unconsolidated joint venture interests		762
Income tax expense	0	0
Gain on sale of real estate assets	14,933	9,194
Nonoperating income (expense)	6,316	1,000
Net income	3,925	(1,476)
Reportable Legal Entities | Non- Guarantors
Revenues:
Revenues	74,521	72,805
Expenses:
Depreciation	20,233	20,668
Amortization	7,461	8,016
General and administrative – corporate	6,005	5,287
General and administrative – unconsolidated joint ventures	809	731
Costs and expenses	59,000	57,972
Other Income (Expense):
Interest expense	(5,053)	(10,494)
Interest and other income	1	1,803
Gain on sale of unconsolidated joint venture interests		0
Income tax expense	(7)	(7)
Gain on sale of real estate assets	(3)	0
Nonoperating income (expense)	(5,062)	(8,698)
Net income	10,459	6,135
Consolidating Adjustments
Revenues:
Revenues	0	0
Expenses:
Depreciation	0	0
Amortization	0	0
General and administrative – corporate	0	0
General and administrative – unconsolidated joint ventures	0	0
Costs and expenses	0	0
Other Income (Expense):
Interest expense	5,053	7,033
Interest and other income	(5,053)	(7,033)
Gain on sale of unconsolidated joint venture interests		0
Income tax expense	0	0
Gain on sale of real estate assets	(14,384)	(4,659)
Nonoperating income (expense)	(14,384)	(4,659)
Net income	(14,384)	(4,659)
Rental income and tenant reimbursements
Revenues:
Revenues	71,862
Revenues		70,360
Rental income and tenant reimbursements | Reportable Legal Entities | Columbia Property Trust (Parent) (Guarantor)
Revenues:
Revenues	0
Revenues		0
Rental income and tenant reimbursements | Reportable Legal Entities | Columbia Property Trust OP (the Issuer)
Revenues:
Revenues	0
Revenues		0
Rental income and tenant reimbursements | Reportable Legal Entities | Non- Guarantors
Revenues:
Revenues	71,862
Revenues		70,360
Rental income and tenant reimbursements | Consolidating Adjustments
Revenues:
Revenues	0
Revenues		0
Property operating costs
Expenses:
Cost of goods and services sold	24,237	23,062
Property operating costs | Reportable Legal Entities | Columbia Property Trust (Parent) (Guarantor)
Expenses:
Cost of goods and services sold	0	0
Property operating costs | Reportable Legal Entities | Columbia Property Trust OP (the Issuer)
Expenses:
Cost of goods and services sold	0	0
Property operating costs | Reportable Legal Entities | Non- Guarantors
Expenses:
Cost of goods and services sold	24,237	23,062
Property operating costs | Consolidating Adjustments
Expenses:
Cost of goods and services sold	0	0
Asset and property management income/fees
Revenues:
Revenues	1,869	1,759
Expenses:
Cost of goods and services sold	255	208
Asset and property management income/fees | Reportable Legal Entities | Columbia Property Trust (Parent) (Guarantor)
Revenues:
Revenues	912	905
Expenses:
Cost of goods and services sold	0	0
Asset and property management income/fees | Reportable Legal Entities | Columbia Property Trust OP (the Issuer)
Revenues:
Revenues	0	0
Expenses:
Cost of goods and services sold	0	0
Asset and property management income/fees | Reportable Legal Entities | Non- Guarantors
Revenues:
Revenues	957	854
Expenses:
Cost of goods and services sold	255	208
Asset and property management income/fees | Consolidating Adjustments
Revenues:
Revenues	0	0
Expenses:
Cost of goods and services sold	0	0
Other property income
Revenues:
Revenues	1,702	1,591
Other property income | Reportable Legal Entities | Columbia Property Trust (Parent) (Guarantor)
Revenues:
Revenues	0	0
Other property income | Reportable Legal Entities | Columbia Property Trust OP (the Issuer)
Revenues:
Revenues	0	0
Other property income | Reportable Legal Entities | Non- Guarantors
Revenues:
Revenues	1,702	1,591
Other property income | Consolidating Adjustments
Revenues:
Revenues	$ 0	$ 0

Financial Information for Par_6

Financial Information for Parent Guarantor, Issuer Subsidiary, and Non-Guarantor Subsidiaries (Consolidating Statements of Comprehensive Income) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Net income	$ 3,513,000	$ 1,498,000
Market value adjustments to interest rate swap	(1,431,000)	2,514,000
Comprehensive income	2,082,000	4,012,000
Reportable Legal Entities | Columbia Property Trust (Parent) (Guarantor)
Condensed Financial Statements, Captions [Line Items]
Net income	3,513,000	1,498,000
Market value adjustments to interest rate swap	(1,431,000)	2,514,000
Comprehensive income	2,082,000	4,012,000
Reportable Legal Entities | Columbia Property Trust OP (the Issuer)
Condensed Financial Statements, Captions [Line Items]
Net income	3,925,000	(1,476,000)
Market value adjustments to interest rate swap	(1,431,000)	2,514,000
Comprehensive income	2,494,000	1,038,000
Reportable Legal Entities | Non- Guarantors
Condensed Financial Statements, Captions [Line Items]
Net income	10,459,000	6,135,000
Market value adjustments to interest rate swap	0	0
Comprehensive income	10,459,000	6,135,000
Consolidating Adjustments
Condensed Financial Statements, Captions [Line Items]
Net income	(14,384,000)	(4,659,000)
Market value adjustments to interest rate swap	1,431,000	(2,514,000)
Comprehensive income	$ (12,953,000)	$ (7,173,000)

Financial Information for Par_7

Financial Information for Parent Guarantor, Issuer Subsidiary, and Non-Guarantor Subsidiaries (Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	$ 35,079	$ 14,771
Cash flows from investing activities:
Net proceeds from sale of investments in unconsolidated joint ventures	0	235,083
Investment in real estate and related assets	(34,652)	(23,877)
Investments in unconsolidated joint ventures	(6,528)	(1,541)
Distributions from unconsolidated joint ventures	5,672	2,976
Distributions from subsidiaries	0	0
Net cash provided by (used in) investing activities	(35,508)	212,641
Cash flows from financing activities:
Borrowings, net of fees	73,979	108,983
Repayments	(23,000)	(247,814)
Distributions	(46,716)	(47,819)
Repurchases of common stock	(2,401)	(29,261)
Net cash provided by (used in) financing activities	1,862	(215,911)
Net increase (decrease) in cash and cash equivalents	1,433	11,501
Cash and cash equivalents, beginning of period	17,118	9,567
Cash and cash equivalents, end of period	18,551	21,068
Reportable Legal Entities | Columbia Property Trust (Parent) (Guarantor)
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	4,638	708
Cash flows from investing activities:
Net proceeds from sale of investments in unconsolidated joint ventures		0
Investment in real estate and related assets	(13,701)	0
Investments in unconsolidated joint ventures	0	0
Distributions from unconsolidated joint ventures	0	0
Distributions from subsidiaries	56,640	75,935
Net cash provided by (used in) investing activities	42,939	75,935
Cash flows from financing activities:
Borrowings, net of fees	0	0
Repayments	0	0
Distributions	(46,716)	(47,819)
Repurchases of common stock	(2,401)	(29,261)
Net cash provided by (used in) financing activities	(49,117)	(77,080)
Net increase (decrease) in cash and cash equivalents	(1,540)	(437)
Cash and cash equivalents, beginning of period	1,705	692
Cash and cash equivalents, end of period	165	255
Reportable Legal Entities | Columbia Property Trust OP (the Issuer)
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	2,948	(5,326)
Cash flows from investing activities:
Net proceeds from sale of investments in unconsolidated joint ventures		235,083
Investment in real estate and related assets	0	0
Investments in unconsolidated joint ventures	(6,528)	(1,541)
Distributions from unconsolidated joint ventures	5,672	2,976
Distributions from subsidiaries	7,313	(9,988)
Net cash provided by (used in) investing activities	6,457	226,530
Cash flows from financing activities:
Borrowings, net of fees	73,979	108,983
Repayments	(23,000)	(247,000)
Distributions	(59,189)	(77,811)
Repurchases of common stock	0	0
Net cash provided by (used in) financing activities	(8,210)	(215,828)
Net increase (decrease) in cash and cash equivalents	1,195	5,376
Cash and cash equivalents, beginning of period	10,573	5,079
Cash and cash equivalents, end of period	11,768	10,455
Reportable Legal Entities | Non- Guarantors
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	41,877	19,389
Cash flows from investing activities:
Net proceeds from sale of investments in unconsolidated joint ventures		0
Investment in real estate and related assets	(20,951)	(23,877)
Investments in unconsolidated joint ventures	0	0
Distributions from unconsolidated joint ventures	0	0
Distributions from subsidiaries	0	0
Net cash provided by (used in) investing activities	(20,951)	(23,877)
Cash flows from financing activities:
Borrowings, net of fees	0	0
Repayments	0	(814)
Distributions	(19,148)	11,864
Repurchases of common stock	0	0
Net cash provided by (used in) financing activities	(19,148)	11,050
Net increase (decrease) in cash and cash equivalents	1,778	6,562
Cash and cash equivalents, beginning of period	4,840	3,796
Cash and cash equivalents, end of period	6,618	10,358
Consolidating Adjustments
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	(14,384)	0
Cash flows from investing activities:
Net proceeds from sale of investments in unconsolidated joint ventures		0
Investment in real estate and related assets	0	0
Investments in unconsolidated joint ventures	0	0
Distributions from unconsolidated joint ventures	0	0
Distributions from subsidiaries	(63,953)	(65,947)
Net cash provided by (used in) investing activities	(63,953)	(65,947)
Cash flows from financing activities:
Borrowings, net of fees	0	0
Repayments	0	0
Distributions	78,337	65,947
Repurchases of common stock	0	0
Net cash provided by (used in) financing activities	78,337	65,947
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	$ 0	$ 0

Uncategorized Items - cxp-20190

Label	Element	Value
Accounting Standards Update 2017-05 [Member] | Accumulated Distributions in Excess of Net Income [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 357,755,000
Accounting Standards Update 2014-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	343,000
Accounting Standards Update 2014-09 [Member] | Accumulated Distributions in Excess of Net Income [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 343,000