Columbia Property Trust (CXP) 10-Q 30 Apr 20 2020 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2020	Apr. 24, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2020
Document Transition Report	false
Entity File Number	001-36113
Entity Registrant Name	COLUMBIA PROPERTY TRUST, INC.
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	20-0068852
Entity Address, Address Line One	315 Park Avenue South
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10010
City Area Code	212
Local Phone Number	687-0800
Title of 12(b) Security	Common Stock
Trading Symbol	CXP
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		114,413,205
Entity Central Index Key	0001252849
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Amendment Flag	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Real estate assets, at cost:
Land	$ 870,352	$ 870,352
Buildings and improvements, less accumulated depreciation of $298,089 and $281,248, as of March 31, 2020 and December 31, 2019, respectively	1,709,699	1,719,207
Intangible lease assets, less accumulated amortization of $60,794 and $58,659, as of March 31, 2020 and December 31, 2019, respectively	57,282	61,025
Construction in progress	65,592	53,621
Real estate assets held for sale, less accumulated depreciation and amortization of $80,543 as of December 31, 2019	0	214,956
Total real estate assets	2,702,925	2,919,161
Operating lease assets	30,090	29,470
Investments in unconsolidated joint ventures	1,087,694	1,054,460
Cash and cash equivalents	292,814	12,303
Tenant receivables	4,322	2,464
Straight-line rent receivable	80,935	77,330
Prepaid expenses and other assets	29,133	21,484
Intangible lease origination costs, less accumulated amortization of $33,952 and $33,731, as of March 31, 2020 and December 31, 2019, respectively	26,386	27,971
Deferred lease costs, less accumulated amortization of $17,962 and $16,732, as of March 31, 2020 and December 31, 2019, respectively	82,886	76,385
Other assets held for sale, less accumulated amortization of $10,222 as of December 31, 2019	0	23,917
Goodwill (Note 3)	63,806	0
Total assets	4,400,991	4,244,945
Liabilities:
Line of credit and notes payable, net of unamortized deferred financing costs of $1,930 and $2,084, as of March 31, 2020 and December 31, 2019, respectively	949,070	781,916
Bonds payable, net of discounts of $1,078 and $1,124 and unamortized deferred financing costs of $3,403 and $3,552, as of March 31, 2020 and December 31, 2019, respectively	695,519	695,324
Operating lease liabilities	2,887	2,186
Accounts payable, accrued expenses, and accrued capital expenditures	90,291	70,845
Dividends payable	0	24,209
Deferred income	18,593	16,955
Intangible lease liabilities, less accumulated amortization of $16,043 and $15,127, as of March 31, 2020 and December 31, 2019, respectively	20,244	21,839
Liabilities held for sale, less accumulated amortization of $— as of December 31, 2019	0	3,054
Total liabilities	1,776,604	1,616,328
Commitments and Contingencies (Note 7)	0	0
Equity:
Common stock, $0.01 par value, 225,000,000 shares authorized, 114,413,205 and 115,280,597 shares issued and outstanding, as of March 31, 2020 and December 31, 2019, respectively	1,144	1,153
Additional paid-in capital	4,369,155	4,392,322
Cumulative distributions in excess of earnings	(1,787,119)	(1,769,234)
Cumulative other comprehensive loss	(20,509)	(1,101)
Total stockholders' equity attributable to Columbia Property Trust	2,562,671	2,623,140
Noncontrolling interest in Columbia Operating Partnership	56,465	0
Noncontrolling interest in Columbia Operating Partnership	5,251	5,477
Total equity	2,624,387	2,628,617
Total liabilities and equity	$ 4,400,991	$ 4,244,945

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Mar. 31, 2020
Building and improvements, accumulated depreciation	$ 281,248	$ 298,089
Intangible lease assets, accumulated amortization	58,659	60,794
Accumulated depreciation and amortization	80,543
Intangible lease origination costs, accumulated amortization	33,731	33,952
Deferred lease costs, accumulated amortization	16,732	17,962
Other assets held for sale, accumulated amortization	10,222
Deferred financing costs, net	2,084	1,930
Bonds payable discount	1,124	1,078
Intangible lease liabilities, accumulated amortization	15,127	$ 16,043
Liabilities held for sale, accumulated amortization	$ 0
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	115,280,597	114,413,205
Common stock, shares outstanding	115,280,597	114,413,205
Term Loans
Deferred financing costs, net	$ 2,084	$ 1,930
Bonds Payable
Deferred financing costs, net	$ 3,552	$ 3,403

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues:
Lease revenues	$ 68,007	$ 71,862
Revenues	76,254	75,433
Expenses:
Property operating costs	22,697	24,492
Depreciation	18,330	20,404
Amortization	6,721	7,461
General and administrative – corporate	11,782	8,424
Management fee expense	6,945	0
General and administrative – joint ventures	0	809
Acquisition costs (Note 3)	12,081	0
Costs and expenses	78,556	61,590
Other Income (Expense):
Interest expense	(9,555)	(12,095)
Other Nonoperating Income (Expense)	(158)	1
Income tax benefit (expense)	2,243	(7)
Income from unconsolidated joint ventures	2,656	1,771
Gain on sale of real estate assets	13,344	0
Nonoperating income (expense)	8,530	(10,330)
Net income	6,228	3,513
Less: net (income) loss attributable to noncontrolling interest in Columbia Operating Partnership	(71)	0
Less: net (income) loss attributable to noncontrolling interest in consolidated joint venture	133	0
Net Income (Loss) Attributable to Parent, Total	$ 6,290	$ 3,513
Per-Share Information – Basic:
Net income (dollars per share)	$ 0.05	$ 0.03
Weighted-average common shares outstanding - basic (in shares)	114,471	116,462
Per-Share Information – Diluted:
Net income (dollars per share)	$ 0.05	$ 0.03
Weighted-average common shares outstanding - diluted (in shares)	114,486	116,880
Management fee revenues
Revenues:
Other property income	$ 8,240	$ 1,869
Other property income
Revenues:
Other property income	$ 7	$ 1,702

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 6,228	$ 3,513
Market value adjustments to interest rate swaps that qualify for hedge accounting treatment	(19,993)	(1,431)
Comprehensive income (loss)	(13,765)	2,082
Less: market value adjustments to interest rate swaps	585	0
Less: net (income) loss attributable to noncontrolling interest in Columbia Operating Partnership	(71)	0
Less: net (income) loss attributable to noncontrolling interest in consolidated joint venture	133	0
Comprehensive income (loss) attributable to common stockholders	$ (13,118)	$ 2,082

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 Loss	Total Equity	Noncontrolling InterestsColumbia Operating Partnership	Noncontrolling InterestsConsolidated Joint Venture
Beginning balance, value at Dec. 31, 2018	$ 2,741,016	$ 1,167	$ 4,421,587	$ (1,684,082)	$ 2,344
Beginning balance, shares at Dec. 31, 2018		116,698,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued to employees and directors, and amortized (net of income tax withholdings)	(858)	$ 2	(860)
Common stock issued to employees and directors, and amortized (net of income tax withholdings), shares		182,000
Distributions to common stockholders	(23,376)			(23,376)
Net income	3,513			3,513
Market value adjustments to interest rate swaps that qualify for hedge accounting treatment	(1,431)				(1,431)
Ending balance, value at Mar. 31, 2019	2,718,864	$ 1,169	4,420,727	(1,703,945)	913
Ending balance, shares at Mar. 31, 2019		116,880,000
Beginning balance, value at Dec. 31, 2019	$ 2,628,617	$ 1,153	4,392,322	(1,769,234)	(1,101)	$ 2,623,140		$ 5,477
Beginning balance, shares at Dec. 31, 2019	115,280,597	115,280,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchases of common stock	$ (23,276)	$ (12)	(23,264)			(23,276)
Repurchases of common stock, shares		(1,194,000)
Issuance of noncontrolling interest in Columbia Operating Partnership	55,306						$ 55,306
Common stock issued to employees and directors, and amortized (net of income tax withholdings)	2,458	$ 3	97			100	2,358
Common stock issued to employees and directors, and amortized (net of income tax withholdings), shares		327,000
Distributions to common stockholders	(24,175)			(24,175)		(24,175)
Contributions from noncontrolling interest in consolidated joint venture	16							16
Distributions to consolidated joint venture partner and Operating Partnership Unit holders	(794)						(685)	(109)
Net income	6,228			6,290		6,290	71	(133)
Market value adjustments to interest rate swaps that qualify for hedge accounting treatment	(19,993)				(19,408)	(19,408)	(585)
Ending balance, value at Mar. 31, 2020	$ 2,624,387	$ 1,144	$ 4,369,155	$ (1,787,119)	$ (20,509)	$ 2,562,671	$ 56,465	$ 5,251
Ending balance, shares at Mar. 31, 2020	114,413,205	114,413,000

Consolidated Statements of Eq_2

Consolidated Statements of Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Common Stock
Distributions to common stockholders per share (dollars per share)	$ 0.21	$ 0.20

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash Flows From Operating Activities:
Net income	$ 6,228	$ 3,513
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Straight-line rental income	(3,394)	(4,631)
Noncash operating lease expense	82	212
Depreciation	18,330	20,404
Amortization	5,330	6,351
Noncash compensation expense	4,657	1,539
Noncash interest expense	642	640
Income from unconsolidated joint ventures	(2,656)	(1,771)
Distributions of earnings from unconsolidated joint ventures	6,996	6,161
Gain on sale of real estate assets	(13,344)	0
Market value adjustment to investment in Real Estate Funds	160	0
Changes in assets and liabilities, net of acquisitions and dispositions:
Increase in tenant receivables, net	(1,702)	(294)
Decrease (increase) in prepaid expenses and other assets	(235)	3,563
Decrease in accounts payable and accrued expenses	(4,605)	(2,701)
Increase (decrease) in deferred income	(342)	2,093
Net cash provided by operating activities	16,147	35,079
Cash Flows From Investing Activities:
Net proceeds from the sale of real estate	250,822	0
Normandy Acquisition (Note 3)	(13,971)	0
Prepaid transaction costs and earnest money	0	(13,701)
Capital improvement and development costs	(23,583)	(19,014)
Deferred lease costs paid	(3,965)	(1,937)
Investments in unconsolidated joint ventures	(43,641)	(6,528)
Investments in Real Estate Funds	(253)	0
Distributions from unconsolidated joint ventures	6,487	5,672
Net cash provided by (used in) investing activities	171,896	(35,508)
Cash Flows From Financing Activities:
Financing costs paid	(5)	(21)
Proceeds from lines of credit and notes payable	347,000	74,000
Repayments of lines of credit and notes payable	(180,000)	(23,000)
Contributions from noncontrolling interest in consolidated joint venture	16	0
Distributions paid to stockholders	(48,384)	(46,716)
Distributions paid to noncontrolling interest in Columbia Operating Partnership	(685)	0
Redemptions of common stock	(25,474)	(2,401)
Net cash provided by financing activities	92,468	1,862
Net increase (decrease) in cash and cash equivalents	280,511	1,433
Cash and cash equivalents, beginning of period	12,303	17,118
Cash and cash equivalents, end of period	$ 292,814	$ 18,551

Organization

Organization	3 Months Ended
	Mar. 31, 2020
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 OP"), a Delaware limited partnership in which Columbia Property Trust is the general partner and majority owner (97.2%). 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, the "Company," "we," "us," or "our" herein shall include Columbia Property Trust and all subsidiaries of Columbia Property Trust, direct and indirect. As of March 31, 2020, Columbia Property Trust owned 15 operating properties and four properties under development or redevelopment, of which 11 were wholly owned and eight were owned through joint ventures, located primarily in New York, San Francisco, Washington, D.C., and Boston. As of March 31, 2020, these operating properties contained 6.3 million rentable square feet and were approximately 97.6% leased. Columbia Property Trust also provides asset and property management services for 8.0 million square feet of office space located primarily in New York, Washington, D.C., and Boston.

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2020
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 OP, and any variable-interest entity in which Columbia Property Trust or Columbia 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 OP, or their subsidiaries own a controlling financial interest and any limited partnership in which Columbia Property Trust, Columbia 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, 2019 (the "2019 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 the three months ended March 31, 2020 and 2019, $2.6 million and $0.9 million, respectively, of interest was capitalized to construction in progress; and during the three months ended March 31, 2020 and 2019, $0.4 million and $0.3 million, respectively, of interest 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, 2020, none of Columbia Property Trust's properties met the criteria to be classified as held for sale in the accompanying balance sheets. As of December 31, 2019, Cranberry Woods Drive and Pasadena Corporate Park met the aforementioned criteria; thus, these properties are classified as held for sale in the accompanying consolidated balance sheets. The sale of Cranberry Woods closed on January 16, 2020; and the sale of Pasadena Corporate Park closed on March 31, 2020. The major classes of assets and liabilities classified as held for sale as of December 31, 2019, are provided below (in thousands): December 31, 2019 Real Estate Assets Held for Sale: Real estate assets, at cost: Land $ 57,117 Buildings and improvements, less accumulated depreciation of $80,543 157,701 Construction in progress 138 Total real estate assets held for sale, net $ 214,956 Other Assets Held for Sale: Tenant receivables $ 156 Straight-line rent receivable 12,591 Prepaid expenses and other assets 334 Deferred lease costs, less accumulated amortization of $10,222 10,836 Total other assets held for sale, net $ 23,917 Liabilities Held for Sale: Accounts payable, accrued expenses, and accrued capital expenditures $ 1,151 Deferred income 1,903 Total liabilities held for sale $ 3,054 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, 2020. 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, 2020 and December 31, 2019, 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 Intangible Above-Market Absorption March 31, 2020 Gross $ 2,480 $ 115,596 $ 60,338 $ 36,287 Accumulated Amortization (1,245) (59,549) (33,952) (16,043) Net $ 1,235 $ 56,047 $ 26,386 $ 20,244 December 31, 2019 Gross $ 2,481 $ 117,203 $ 61,702 $ 36,966 Accumulated Amortization (1,202) (57,457) (33,731) (15,127) Net $ 1,279 $ 59,746 $ 27,971 $ 21,839 Amortization of Intangible Assets and Liabilities Arising From In-Place Leases For the three months ended March 31, 2020 and 2019, Columbia Property Trust recognized the following amortization of intangible lease assets and liabilities (in thousands): Intangible Lease Assets Intangible Intangible Above-Market Absorption For the Three Months Ended March 31, 2020 $ 43 $ 3,700 $ 1,586 $ 1,596 For the Three Months Ended March 31, 2019 $ 82 $ 3,656 $ 2,100 $ 1,426 The net intangible assets and liabilities remaining as of March 31, 2020 will be amortized as follows, excluding amounts held for sale, if applicable (in thousands): Intangible Lease Assets Intangible Intangible Above-Market Absorption For the remainder of 2020 $ 129 $ 9,219 $ 4,296 $ 3,888 For the years ending December 31: 2021 172 9,328 4,516 3,191 2022 172 7,959 3,429 2,910 2023 172 6,455 2,903 2,336 2024 172 5,594 2,586 1,990 2025 172 4,083 1,921 1,364 Thereafter 246 13,409 6,735 4,565 $ 1,235 $ 56,047 $ 26,386 $ 20,244 Investments in Unconsolidated Joint Ventures Columbia Property Trust uses the equity method to account for investments that are not wholly owned and: (i) are considered variable interest entities where the Company is not the primary beneficiary, or (ii) in which the Company, along with its co-owners, possesses substantive participation rights, including management selection and termination, and the approval of significant capital and operating decisions. Under the equity method, investments in unconsolidated joint ventures are recorded at cost and adjusted for cash contributions and distributions, and allocations of income or loss. Investments in Real Estate Funds In connection with the Normandy Acquisition described in Note 3, Transactions , Columbia Property Trust acquired general partnership interests and limited partnership interests in three real estate funds: Normandy Real Estate Fund III, LP; Normandy Real Estate Fund IV, LP; and Normandy Opportunity Zone Fund, LP (collectively, the "Real Estate Funds"). The Company owns minimal economic interests in the Real Estate Funds (ranging from 2.0% to 2.5%). Significant decision rights are shared between the general partners and limited partners; and the general partner can be removed with a majority vote from the limited partners. As a result, Columbia Property Trust accounts for its investments in the Real Estate Funds using the equity method. The Real Estate Funds are subject to the rules of the AICPA Investment Company Guide; as a result, GAAP requires the Company to record its investments in the Real Estate Funds at their respective estimated fair market values. The Company determines the Real Estate Funds' estimated net asset values per share using a discounted cash flow model, which is considered a Level 3 valuation technique (see Fair Value Measurements section above). As of March 31, 2020, investments in the Real Estate Funds of approximately $3.8 million are included in prepaid expenses and other assets on the accompanying consolidated balance sheet. From January 24, 2020 (date of acquisition) through March 31, 2020, Columbia Property Trust recognized an unrealized loss on its investments in Real Estate Funds of approximately $160,000, which is recorded as other income (loss) in the accompanying consolidated statements of operations. Columbia Property Trust has entered into agreements to provide acquisition, disposition, investment management, property management, leasing, and other services to the properties in which the Real Estate Funds own interests. See Note 12, Non-Lease Revenues , for more details. From time to time, Columbia Property Trust may be required to make additional capital contributions to the Real Estate Funds. See Note 7, Commitments and Contingencies , for more details. Goodwill Goodwill represents purchase price not specifically assigned to assets acquired and liabilities assumed in a business combination. On January 24, 2020, Columbia Property Trust recorded goodwill of $63.8 million in connection with the Normandy Acquisition (see Note 3, Transactions for details). Columbia Property Trust assesses the recoverability of goodwill on an annual basis, and on an interim basis if an event occurs or circumstances change that would indicate that the carrying value of goodwill may be impaired. When indicators of potential impairment exist, Columbia evaluates whether the carrying value of the reporting unit to which the goodwill relates exceeds the reporting unit's estimated fair value. If the reporting unit's carrying value exceeds its estimated fair value, Columbia Property Trust would then perform the same assessment at the enterprise level. If the carrying value of Columbia Property Trust's equity exceeds the estimated fair value of the Company, then goodwill would be reduced, and an impairment loss would be recognized, for the amount of this excess (not to exceed total goodwill). Columbia Property Trust has determined that the carrying value of goodwill is recoverable as of March 31, 2020. 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 and currently does not have any derivatives that are not designated as hedges; however, certain of its derivatives may, at times, 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 (loss). 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. As of March 31, 2020, Columbia Property Trust has two interest rate swaps with an aggregate notional value of $450.0 million. 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 $ — $ 551 Interest rate contracts Accounts payable $ 21,094 $ 1,652 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 2020 2019 Market value adjustment to interest rate swaps designated as hedging instruments and included in other comprehensive income (loss) $ (19,993) $ (1,431) 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. Noncontrolling Interests Noncontrolling interests represent the portion of equity in consolidated entities that is owned by third-parties. Noncontrolling interests are adjusted for cash contributions and distributions, and for earnings. Earnings are allocated between the Company and noncontrolling interests using the hypothetical liquidation at book value method pursuant to the terms of the respective ownership agreements, and are reflected as net income (loss) attributable to noncontrolling interests in the accompanying consolidated statements of operations. 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, the Company 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, the Company would be subject to federal and state corporate income tax on the undistributed income. Generally, the Company 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; Columbia Development TRS 13, LLC; and Columbia Development TRS 87, LLC (collectively, the "TRS Entities") are subsidiaries of the Company and are organized as Delaware limited liability companies. The TRS Entities, among other things, provide services related to asset and property management, construction and development, and other tenant services that Columbia Property Trust, as a REIT, cannot otherwise provide. The Company 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 the Company 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, the Company records interest and penalties related to uncertain tax positions as general and administrative expense in the accompanying consolidated statements of operations. Reclassification Certain prior-period amounts on our consolidated statement of operations have been reclassified to conform with current-period's presentation: property operating costs includes amounts previously reported as asset and property management fees. Recent Accounting Pronouncements Accounting Standard Update 2020-04, Reference Rate Reform ("ASC 2020-04"), which was issued on and effective as of March 12, 2020, addresses the accounting and disclosure impacts of reference rate reform and the anticipated discontinuance of London Interbank Offering Rate ("LIBOR"). ASU 2020-04 provides optional guidance that may be elected over time, and includes practical expedients for activities that impact debt, leases, derivatives, and other contracts. Columbia Property Trust has matched LIBOR-based debt with LIBOR-based interest rate swaps, and has elected to apply the ASU 2020-04's practical expedients related to (i) probability and (ii) the assessment of the effectiveness for future LIBOR-indexed cash flows, which assume that the debt instrument will use the same index rate as its corresponding interest rate swap once a new reference rate is established to replace LIBOR. Application of these expedients preserves the effectiveness of our interest rate swaps as cash flow hedges in the event that our debt and interest rate swaps are not amended concurrently to reflect a new reference rate. Columbia Property Trust continues to evaluate the impact of the guidance and may apply other elections as additional reference rate changes occur. ASU 2020-04 did not have a material impact on Columbia Property Trust's consolidated financial statements or disclosures. Accounting Standard Update 2018-13 , Fair Value Measurement: Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement ("ASU 2018-13"), which became effective for Columbia Property Trust on January 1, 2020, is intended to improve the effectiveness of disclosures required by entities regarding recurring and nonrecurring fair value measurements by removing, modifying, or adding certain disclosures. ASU 2018-13 did not have a material impact on Columbia Property Trust's consolidated financial statements or disclosures. Recent Disclosure Pronouncement The SEC's Final Rule Release No. 33-10762, Financial Disclosures About Guarantors and Issuers of Guaranteed Securities and Affiliates Whose Securities Collateralize a Registrant's Securities (the "SEC Release No. 33-10762") was issued on March 2, 2020 and adopted by Columbia Property Trust in the first quarter of 2020. With respect to the disclosure requirements for subsidiary issuers and guarantors of registered debt securities, SEC Release No. 33-10762 amends SEC Rule 3-10 by, among other things: • Simplifying the criteria that must be met for a parent registrant to qualify for an exemption allowing it to provide summarized financial information in lieu of standalone audited financial statements of the subsidiary issuer, including replacing the requirement that a subsidiary issuer be wholly owned by the parent guarantor with a requirement that the subsidiary issuer be consolidated in the parent guarantor’s financial statements. • Upon qualifying for the exemption above, replacing the previous requirement to include condensed consolidating financial information in the registrant's (parent guarantor's) financial statements, with a requirement to include certain summarized financial information (Alternative Disclosures) in either the registrant's financial statement footnotes or in its Management’s Discussion and Analysis. Our Bonds Payable (see Note 6., Bond Payable) were issued by Columbia OP, and are fully and unconditionally guaranteed by Columbia Property Trust and by no other party. Columbia Property Trust owns 97.2% of Columbia OP, and includes the accounts of Columbia OP in its consolidated financial statements. Therefore, upon adopting SEC Release No. 33-10762 this quarter, we are providing Alternative Disclosures in the Management's Discussion and Analysis section of this Form 10-Q.

Transactions

Transactions	3 Months Ended
	Mar. 31, 2020
Real Estate [Abstract]
Transactions	Transactions Normandy Acquisition On January 24, 2020, Columbia Property Trust acquired Normandy Real Estate Management, LLC ("Normandy"), a developer, operator, and investment manager of office and mixed-use assets with a focus on assets in New York, Boston, and Washington, D.C. (the "Normandy Acquisition"). As a result of the Normandy Acquisition, the Company acquired an operating platform, interests in the Real Estate Funds, and contracts to earn fees for providing management services to properties affiliated with the Real Estate Funds (see Note 12, Non-Lease Revenues , for details). The purchase price, exclusive of adjustments and transaction costs, is comprised of two components: (i) an approximately $14.0 million cash payment, and (ii) the issuance of 3,264,151 Series A Convertible, Perpetual Preferred Units of Columbia OP with a liquidation preference of $26.50 per unit (the "Preferred OP Units"). The Preferred OP Units are convertible for common units of Columbia OP, which are exchangeable into shares of Columbia Property Trust's common stock, subject to certain terms and conditions. As of the closing date of the acquisition, the Preferred OP Units had an estimated fair value of $24.43. The fair value of the Preferred OP Units was determined using a lattice valuation model, utilizing significant unobservable inputs (Level 3 under the fair value hierarchy described in Note 2, Summary of Significant Accounting Policies ). The initial purchase consideration was allocated as follows (in thousands): January 24, 2020 Goodwill $ 63,806 Prepaid expenses and other assets (1) 7,670 Cash 1,260 Operating lease assets 934 Investments in unconsolidated joint ventures (2) 419 Accounts payable, accrued expenses, and accrued capital expenditures (2,881) Operating lease liabilities (934) Deferred income (77) Total initial purchase consideration $ 70,197 (1) Prepaid expenses and other assets includes $3.7 million of investments in Real Estate Funds, as described in Note 2, Summary of Significant Accounting Policies . (2) Reflects interests in five unconsolidated joint ventures that earn fees for providing management services to properties affiliated with the Real Estate Funds. In addition, approximately $24.4 million will be recorded as compensation expense over the next four years based on the vesting periods of the respective Preferred OP Units. During the first quarter of 2020, Columbia Property Trust incurred $12.1 million of transaction costs related to the Normandy Acquisition, which include legal, advisory, and other professional services fees and is reflected as acquisition costs on the accompanying consolidated statements of operations. For the period from January 24, 2020 through March 31, 2020, Columbia Property Trust recognized additional revenues of $5.2 million and additional net income, excluding the impact of acquisition costs, of $0.7 million as a result of the Normandy Acquisition. Real Estate Acquisitions Property Location Date Percent Acquired Purchase Price (in thousands) (1) 2020 Terminal Warehouse New York, NY March 13, 2020 8.65 % $ 40,048 (2) 2019 201 California Street San Francisco, CA December 9, 2019 100.00 % $ 238,900 101 Franklin Street (3) New York, NY December 2, 2019 92.50 % $ 205,500 (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) This property is owned through an unconsolidated joint venture. Purchase price is for Columbia Property Trust's partial interest in the property. (3) Property is owned through a consolidated joint venture. Terminal Warehouse Joint Venture On March 13, 2020, Columbia Property Trust acquired a one-third general partnership interest and limited partnership interests, totaling an 8.65% economic interest, in Terminal Warehouse, a 1.2-million-square-foot property located in West Chelsea, New York, that will be fully redeveloped into mixed-use retail and office space (the "Terminal Warehouse Joint Venture"). The Terminal Warehouse Joint Venture has a two one Unconsolidated Joint Ventures , and Note 12, Non-Lease Revenues , for more detail. 201 California Street On December 9, 2019, Columbia Property Trust acquired 201 California Street, a 17-story, 252,000-square-foot office tower in San Francisco. As of the acquisition date, 201 California Street was 99% leased to 34 tenants, including First Republic Bank (13%), Dow Jones & Company, Inc. (12%), and Cooper, White & Cooper, LLP (12%). For the period from December 9, 2019 to December 31, 2019, Columbia Property Trust recognized revenues of $1.4 million and net income of $0.1 million from 201 California Street. 101 Franklin Street On December 2, 2019, Columbia Property Trust acquired a 92.5% controlling financial interest in 101 Franklin Street, a 16-story, 235,000-square-foot office building in Manhattan that will be fully redeveloped through a consolidated joint venture. Purchase Price Allocations for Consolidated Property Acquisitions 201 California Street 101 Franklin Street (1) (in thousands) (in thousands) Location San Francisco, CA New York, NY Date Acquired December 9, 2019 December 2, 2019 Purchase Price: Land $ 77,833 $ 57,145 Building and improvements 157,513 149,500 Intangible lease assets 13,241 — Intangible lease origination costs 5,785 — Intangible below market lease liability (8,064) — Total purchase price $ 246,308 $ 206,645 (1) Owned through a consolidated joint venture, in which Columbia Property Trust owns a 92.5% interest. Pro Forma Financial Information The following unaudited pro forma statement of operations presented for the three months ended March 31, 2019, has been prepared for Columbia Property Trust to give effect to the acquisitions of 201 California Street and 101 Franklin Street as if the acquisitions had occurred on January 1, 2018. The following unaudited pro forma financial information for Columbia Property Trust has been prepared for informational purposes only and is not necessarily indicative of future results or of actual results that would have been achieved had these acquisitions been consummated as of January 1, 2018 (in thousands): For the Three Months Ended March 31, 2019 Revenues $ 79,656 Net income attributable to common stockholders of Columbia Property Trust $ 5,736 Real Estate Dispositions During 2020 and 2019, Columbia Property Trust sold the following properties, or partial interests in properties of unconsolidated joint ventures. Additional information for certain of the disposition transactions is provided below the table. Property Location Date % Sold Sales Price (1) (in thousands) Gain (loss) on Sale 2020 Pasadena Corporate Park Los Angeles, CA March 31, 2020 100 % $ 78,000 $ (83) Cranberry Woods Drive Pittsburgh, PA January 16, 2020 100 % $ 180,000 $ 13,428 2019 Lindbergh Center Atlanta, GA September 26, 2019 100 % $ 187,000 $ — One & Three Glenlake Parkway Atlanta, GA April 15, 2019 100 % $ 227,500 $ 42,030 (1) Exclusive of transaction costs and price adjustments. Pasadena Corporate Park On March 31, 2020, Columbia Property Trust closed on the sale of Pasadena Corporate Park for a gross sales price of $78.0 million, exclusive of transaction costs, resulting in a loss on sale of $83,000. Columbia Property Trust recognized an impairment loss of $20.6 million related to this property in the fourth quarter of 2019. The proceeds from this transaction are held in cash and cash equivalents on the accompanying consolidated balance sheet as of March 31, 2020. Cranberry Woods Drive On January 19, 2020, Columbia Property Trust closed on the sale of Cranberry Woods Drive for a gross sales price of $180.0 million, exclusive of transaction costs, resulting in a gain on sale of $13.4 million. The proceeds from this transaction were used to pay down the Revolving Credit Facility, as described in Note 5, Line of Credit and Notes Payable . Lindbergh Center On September 26, 2019, Columbia Property Trust closed on the sale of Lindbergh Center, including Lindbergh Center – Retail, for a gross sales price of $187.0 million, exclusive of transaction costs. Columbia Property Trust recognized an impairment loss of $23.4 million related to this property in the third quarter of 2019. $46.0 million of the proceeds from this transaction had been used to pay down the Revolving Credit Facility, as described in Note 5, Line of Credit and Notes Payable . One & Three Glenlake Parkway On April 15, 2019, Columbia Property Trust closed on the sale of One & Three Glenlake Parkway in Atlanta, for a gross sale price of $227.5 million, exclusive of $33.6 million of adjustments for tenant improvements and rent abatements funded at closing. The proceeds from this transaction were used to pay down 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, 2020
Equity Method Investments and Joint Ventures [Abstract]
Unconsolidated Joint Ventures	Unconsolidated Joint Ventures As of March 31, 2020 and December 31, 2019, Columbia Property Trust owned interests in the following properties through joint ventures, which are accounted for using the equity method of accounting (in thousands): Carrying Value of Investment (1) Joint Venture Property Name Geographic Market Ownership Interest March 31, 2020 December 31, 2019 Market Square Joint Venture Market Square Washington, D.C. 51.00 % $ 136,481 $ 135,557 University Circle Joint Venture University Circle San Francisco 55.00 % 281,457 283,633 333 Market Street Joint Venture 333 Market Street San Francisco 55.00 % 268,438 269,638 114 Fifth Avenue Joint Venture 114 Fifth Avenue New York 49.50 % 83,726 87,750 1800 M Street Joint Venture 1800 M Street Washington, D.C. 55.00 % 230,570 233,196 799 Broadway Joint Venture (2) 799 Broadway New York, NY 49.70 % 46,620 44,686 Terminal Warehouse Joint Venture Terminal Warehouse New York, NY 8.65 % 39,724 — Real Estate Services Joint Ventures (3) n/a (3) n/a (3) Various (3) 678 — $ 1,087,694 $ 1,054,460 (1) Includes basis differences. There is an aggregate net difference of $288.9 million and $279.2 million as of March 31, 2020 and December 31, 2019, 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) Columbia Property Trust capitalized interest of $0.4 million and $0.3 million on its investment in the 799 Broadway Joint Venture during the three months ended March 31, 2020 and 2019, respectively. (3) Columbia Property Trust owns interests in the following five unconsolidated joint ventures that earn fees for providing management services to properties affiliated with the Real Estate Funds (the "Real Estate Services Joint Ventures"): L&L Normandy Terminal Asset Manager, LLC (67%); L&L Normandy Terminal Development Manager, LLC (50%); L&L Normandy Terminal Property Manager (50%) (collectively, the "Terminal Services Joint Ventures"); WNK Maiden Management (50%); and Maple AB Services, LLC (55%). The Terminal Services Joint Ventures earn fees from providing services to the Terminal Warehouse Joint Venture. 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 unconsolidated 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, investments in unconsolidated joint ventures are 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 exceeds 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, 2020. 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, December 31, 2019 March 31, December 31, 2019 March 31, December 31, 2019 Market Square Joint Venture $ 579,363 $ 582,747 $ 324,828 (2) $ 324,815 $ 242,942 $ 241,719 University Circle Joint Venture 217,185 216,546 — — 211,218 212,656 333 Market Street Joint Venture 364,893 367,652 — — 349,936 352,385 114 Fifth Avenue Joint Venture 476,785 485,442 — — 119,831 127,554 1800 M Street Joint Venture 429,767 437,439 — — 416,836 421,588 799 Broadway Joint Venture 220,024 201,210 119,156 (3) 109,735 88,374 85,316 Terminal Warehouse 1,042,748 — 618,766 (4) — 339,319 — Real Estate Services Joint Ventures 2,495 — — — 1,198 — $ 3,333,260 $ 2,291,036 $ 1,062,750 $ 434,550 $ 1,769,654 $ 1,441,218 (1) Excludes basis differences (see footnote (1) to the Carrying Value of Investment table above), which are amortized to income (loss) from unconsolidated joint ventures over the lives of the underlying assets of 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. (3) Reflects $122.1 million outstanding, net of $3.0 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 Commitments and Contingencies . (4) Reflects $625.5 million outstanding, net of $6.7 million of net unamortized deferred financing costs, on the Terminal Warehouse acquisition loan. The Terminal Warehouse Joint Venture has an interest-only acquisition loan with a total capacity of $650.0 million. The Terminal Warehouse acquisition loan bears interest at LIBOR plus 340 basis points and matures on October 23, 2020, with a one Summarized income statement information for the unconsolidated joint ventures for the three months ended March 31, 2020 and 2019 is as follows (in thousands): Total Revenues Net Income (Loss) Columbia Property Trust's Share of Net Income (Loss) (1) 2020 2019 2020 2019 2020 2019 Market Square Joint Venture $ 12,690 $ 11,337 $ (1,994) $ (2,595) $ (1,017) $ (1,323) University Circle Joint Venture 10,924 11,272 5,715 6,364 3,144 3,500 333 Market Street Joint Venture 7,067 7,054 3,705 3,713 2,037 2,042 114 Fifth Avenue Joint Venture 10,428 10,919 (2,653) (2,506) (1,314) (1,240) 1800 M Street Joint Venture 9,937 9,454 1,752 388 964 214 799 Broadway Joint Venture — — (32) (526) (16) (262) Terminal Warehouse 2,307 — (3,741) — (324) — Real Estate Services Joint Ventures 1,875 — 938 — 341 — $ 55,228 $ 50,036 $ 3,690 $ 4,838 $ 3,815 $ 2,931 (1) Excludes amortization of basis differences (see footnote to (1) the Carrying Value of Investment table above), which are recorded as income (loss) from unconsolidated joint ventures in the accompanying consolidated statements of operations. Management Fees Columbia Property Trust provides services to the following joint ventures, including asset and property management and/or development management. Under the asset and property management 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. Under the development management agreements, Columbia Property Trust oversees the development or redevelopment projects at the joint-venture-owned properties. During the three months ended March 31, 2020 and 2019, Columbia Property Trust earned the following fees from its unconsolidated joint ventures (in thousands): Three Months Ended 2020 2019 Market Square Joint Venture $ 574 $ 568 University Circle Joint Venture 587 574 333 Market Street Joint Venture 214 207 1800 M Street Joint Venture 555 520 799 Broadway Joint Venture 223 — $ 2,153 $ 1,869 In the first quarter of 2020, Columbia Property Trust earned reimbursement income for management fee administration costs of $1.3 million which is included in management fee revenues. In the first quarter of 2019, Columbia Property Trust earned reimbursement income for management fee administration costs of $1.2 million which is included in other property income. Asset and property management fees of $0.3 million and $0.6 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, 2020 and December 31, 2019, respectively.

Line of Credit and Notes Payabl

Line of Credit and Notes Payable	3 Months Ended
	Mar. 31, 2020
Debt Disclosure [Abstract]
Line of Credit and Notes Payable	Line of Credit and Notes Payable As of March 31, 2020 and December 31, 2019, 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 $ 501,000 $ 334,000 $300 Million Term Loan 300,000 300,000 $150 Million Term Loan 150,000 150,000 Less: Deferred financing costs related to term loans and notes payable, net of accumulated amortization (1,930) (2,084) $ 949,070 $ 781,916 Columbia Property Trust's amended and restated credit and term loan 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 one 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 Columbia Property Trust's credit rating. The interest rate on the $300 Million Term Loan has been effectively fixed at 2.55% with an interest rate swap agreement. Columbia Property Trust's $150.0 million unsecured term loan matures in July 2022 (the "$150 Million Term Loan") and bears interest, at our option, at either (i) LIBOR, plus an applicable margin ranging from 0.90% to 1.75% for LIBOR loans, or (ii) alternative base rate, plus an applicable margin ranging from 0.00% to 0.75% for base rate loans. The interest rate on the $150 Million Term Loan is effectively fixed with an interest rate swap agreement, which is designated as a cash flow hedge. Based on the terms of the interest rate swap and our current credit rating, the interest rate on the $150 Million Term Loan is effectively fixed at 3.07%. Fair Value of Debt The estimated fair value of Columbia Property Trust's line of credit and notes payable as of March 31, 2020 and December 31, 2019, was approximately $935.8 million and $784.1 million, respectively. The related carrying value of the line of credit and notes payable as of March 31, 2020 and December 31, 2019, was $951.0 million and $784.0 million, respectively. Columbia Property Trust estimated the fair value of its term loans 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, 2020 and 2019, Columbia Property Trust made interest payments of approximately $5.0 million and $5.6 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, 2020, Columbia Property Trust capitalized interest of $3.0 million, $2.6 million of which was capitalized to construction in progress, and $0.4 million of which was capitalized to investments in unconsolidated joint ventures. 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. For the three months ended March 31, 2020, the weighted average interest rate on Columbia Property Trust's consolidated outstanding borrowings was 3.26%. Debt Covenants As of March 31, 2020, 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, 2020
Debt Disclosure [Abstract]
Bonds Payable	Bonds Payable Columbia Property Trust has two series of bonds outstanding as of March 31, 2020 and December 31, 2019: $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. The Bonds Payable were issued by Columbia OP and are fully and unconditionally guaranteed by Columbia Property Trust, Inc. Interest payments of $6.4 million were made on the Bonds Payable during both the three months ended March 31, 2020 and 2019. Columbia Property Trust is subject to substantially similar covenants under the 2026 Bonds Payable and the 2025 Bonds Payable. As of March 31, 2020, 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, 2020 and December 31, 2019, the estimated fair value of the Bonds Payable was approximately $735.7 million and $734.4 million, respectively, and the related carrying value, net of discounts, as of both March 31, 2020 and December 31, 2019 was $698.9 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, 2020
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, 2020, Columbia Property Trust has the following material tenant obligations under leases: (i) $15.9 million related to the WeWork lease at 149 Madison, and (ii) $17.6 million related to the Pershing lease at 95 Columbus. As of March 31, 2020, accruals have not been recorded for these amounts, as such obligations are recorded as incurred. In addition, in January 2020, Columbia Property Trust preleased space to be added to 80 M Street in a vertical expansion project. Columbia is required to fund approximately $65.3 million for construction and tenant improvement allowances related to the new space at 80 M Street. Commitments Under Joint Venture Agreements Columbia Property Trust's joint venture agreements, including those that are developing or redeveloping properties, provide for capital contributions to be made to the joint ventures by the joint venture partners. As of March 31, 2020, Columbia Property Trust holds eight properties through consolidated and unconsolidated joint ventures, including three that are under development or redevelopment. Capital contributions are payable when a capital call is made by the joint venture, and there are no unfunded capital calls as of March 31, 2020. As of March 31, 2020, the 799 Broadway Joint Venture has $122.1 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, 2020, the remaining equity contribution requirement is $28.8 million, of which $14.3 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, 2020, no capital calls remain unpaid; therefore, no liability has been recorded related to this guaranty. Commitments Under Real Estate Fund Agreements Columbia Property Trust's Real Estate Fund investments require capital contributions from time to time. As of March 31, 2020, the Company had $4.6 million of unfunded capital contributions, which are callable for the life of the Real Estate Funds, through 2026. Such capital contributions are payable when a capital call is made by the Real Estate Funds, and there are no unfunded capital calls as of March 31, 2020. Litigation

Stockholders' Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2020
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, 2019 through September 4, 2021 (the "2019 Stock Repurchase Program"). Under the 2019 Stock Repurchase Program, Columbia Property Trust acquired 1.2 million shares at an average price of $19.47 per share, for aggregate purchases of $23.3 million during the three months ended March 31, 2020. As of March 31, 2020, $143.3 million remains available for repurchases under the 2019 Stock Repurchase Program. Common stock repurchases are charged against equity as incurred, and the repurchased shares are retired. 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. During the three months ended March 31, 2020, Columbia Property Trust granted 294,725 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. Also, during the three months ended March 31, 2020, Columbia Property Trust granted 351,730 of performance-based restricted stock units (the "Performance-Based RSUs"), of which 75% will vest at the conclusion of a three Time-Based Awards Performance-Based Awards Restricted Shares Weighted-Average Grant-Date Fair Value (1) RSUs Weighted-Average Grant-Date Fair Value (2) Unvested awards – beginning of period 374 $ 20.96 584 $ 18.86 Granted 295 $ 21.06 303 $ 18.06 Converted (3) 33 (33) Vested (166) $ 21.22 (101) $ 18.48 Forfeited — $ — (9) $ 20.49 Unvested awards – end of period (4) 536 $ 20.94 744 $ 18.58 (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) Reflects 25% of the 2017 3-year Performance-Based RSUs granted on January 1, 2017, which converted to Time-Based Restricted shares in January 2020 and will vest in January 2021. (4) As of March 31, 2020, Columbia Property Trust expects approximately 514,000 of the 536,000 unvested restricted stock units to ultimately vest and approximately 713,000 of the 744,000 unvested Performance-Based RSUs to ultimately vest, assuming a weighted-average forfeiture rate of 4.1%, 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 are made annually for the following year and vest immediately. During the three months ended March 31, 2020 and 2019, Columbia Property Trust made the following equity retainer grant: Date of Grant Shares Grant-Date Fair Value March 2, 2020 (1) 591 $ 19.80 (1) In March 2020, a new director was appointed to the board of directors of Columbia Property Trust. The new director received a pro-rated annual equity retainer grant at appointment. Stock-Based Compensation Expense For the three months ended March 31, 2020 and 2019, Columbia Property Trust incurred stock-based compensation expense related to the following events (in thousands): Three Months Ended 2020 2019 Amortization of time-based awards $ 947 $ 884 Amortization of performance-based awards (1) 1,031 655 Amortization of Preferred OP unit awards issued in connection with the Normandy Acquisition 2,358 — Issuance of shares to independent directors 12 — Total stock-based compensation expense $ 4,348 $ 1,539 (1) Reflects amortization of awards made under the LTI Plan that will vest in future periods for service during the current period. These expenses are included in general and administrative expenses – corporate in the accompanying consolidated statements of operations. As of March 31, 2020 and December 31, 2019, there were $18.3 million and $9.5 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

Noncontrolling Interests

Noncontrolling Interests	3 Months Ended
	Mar. 31, 2020
Noncontrolling Interest [Abstract]
Noncontrolling Interests	Noncontrolling Interests Noncontrolling Interest – Columbia OP In connection with the Normandy Acquisition, Columbia Property Trust issued 3,264,151 Series A Convertible, Preferred Units of Columbia OP with a liquidation preference of $26.50 per unit (the “Preferred OP Units”). The Preferred OP Units vest over four years, subject to certain conditions. The Preferred OP Units are convertible into common units of Columbia OP, which are exchangeable for shares of Columbia Property Trust's common stock on a one-for-one basis, subject to certain terms and conditions. As of March 31, 2020, Columbia Property Trust holds a 97.2% controlling financial interest in Columbia OP. Columbia OP is a variable interest entity in which the Company is the primary beneficiary. Thus, Columbia Property Trust consolidates the accounts of Columbia OP, and reflects the third-party ownership in this entity as noncontrolling interest in the accompanying consolidated balance sheet. As of March 31, 2020, Columbia OP has total assets and liabilities of $4.3 billion and $1.9 billion, respectively. Noncontrolling Interest – Consolidated Joint Venture Columbia Property Trust holds a 92.5% controlling financial interest in 101 Franklin Street, a 16-story, 235,000-square-foot office building in Manhattan that will be fully redeveloped through a consolidated joint venture with an affiliate of Normandy. 101 Franklin Street is a variable interest entity, or VIE, in which Columbia Property Trust is the primary beneficiary. Thus, the Company consolidates the accounts of 101 Franklin Street, and reflects the third-party ownership in this entity as noncontrolling interest in the accompanying consolidated balance sheet. As of March 31, 2020, Franklin Street had total assets and liabilities of $5.1 million and $3.0 million, respectively.

Supplemental Disclosures of Non

Supplemental Disclosures of Noncash Investing and Financing Activities	3 Months Ended
	Mar. 31, 2020
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, 2020 and 2019 (in thousands): Three Months Ended 2020 2019 Other assets assumed at acquisition $ 245 $ — Operating lease liability assumed at acquisition $ 961 $ 34,791 Other liabilities assumed at acquisition $ 245 $ — Amortization of net discounts on debt $ 45 $ 45 Accrued investments in unconsolidated joint ventures $ — $ 88 Accrued capital expenditures and deferred lease costs $ 15,447 $ 19,603 Market value adjustments to interest rate swaps that qualify for hedge accounting treatment $ (19,993) $ (1,431) Issuance of Preferred OP Units for the Normandy Acquisition (Note 3) $ 55,306 $ — Stock-based compensation expense $ 4,348 $ 1,539

Leases

Leases	3 Months Ended
	Mar. 31, 2020
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. As of March 31, 2020, Columbia Property Trust has one ground lease with a remaining lease term of 57.8 years inclusive of renewal options, which is included in operating lease assets of $30.1 million. Payments for all future periods under this ground lease have already been made. Thus, as of March 31, 2020, operating lease liabilities of $2.9 million include only the present value of future payments due under two office leases, with a weighted average remaining lease term of 2.5 years, inclusive of renewal options. 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. Rental income related to such leases is recognized on a straight-line basis over the remaining lease period, and is included in lease revenues on the consolidated statements of operations. As of March 31, 2020, the weighted-average remaining term for such leases is approximately 6.4 years. Lease revenues include fixed and variable payments. Fixed payments primarily relate to base rent and include payments related to lease terminations; and variable payments primarily relate to tenant reimbursements for certain property operating costs. Fixed and variable payments for the three months ended March 31, 2020 are as follows (in thousands): For the Three Months Ended March 31, 2020 2019 Fixed payments $ 61,243 $ 65,517 Variable payments 6,764 6,345 Total lease revenues $ 68,007 $ 71,862
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. As of March 31, 2020, Columbia Property Trust has one ground lease with a remaining lease term of 57.8 years inclusive of renewal options, which is included in operating lease assets of $30.1 million. Payments for all future periods under this ground lease have already been made. Thus, as of March 31, 2020, operating lease liabilities of $2.9 million include only the present value of future payments due under two office leases, with a weighted average remaining lease term of 2.5 years, inclusive of renewal options. 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. Rental income related to such leases is recognized on a straight-line basis over the remaining lease period, and is included in lease revenues on the consolidated statements of operations. As of March 31, 2020, the weighted-average remaining term for such leases is approximately 6.4 years. Lease revenues include fixed and variable payments. Fixed payments primarily relate to base rent and include payments related to lease terminations; and variable payments primarily relate to tenant reimbursements for certain property operating costs. Fixed and variable payments for the three months ended March 31, 2020 are as follows (in thousands): For the Three Months Ended March 31, 2020 2019 Fixed payments $ 61,243 $ 65,517 Variable payments 6,764 6,345 Total lease revenues $ 68,007 $ 71,862

Non-Lease Revenues

Non-Lease Revenues	3 Months Ended
	Mar. 31, 2020
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 11, Leases . Columbia Property Trust also has the following non-lease revenue streams. Management Fee Revenue Under asset and property management agreements in place with third parties and certain of its unconsolidated joint ventures, Columbia Property Trust earns revenue for performing asset and property management functions for properties owned by the Real Estate Funds and its joint ventures, as further described in Note 4, Unconsolidated Joint Ventures , as well as third-party-owned properties. For the three months ended March 31, 2020 and 2019, Columbia Property Trust earned management fee revenues of $4.3 million and $1.9 million, respectively, under these agreements. Leasing Fees Under asset and property management agreements in place with third parties and for certain properties owned by joint ventures and the Real Estate Funds, Columbia Property Trust is eligible to earn leasing 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, 2020 and 2019, Columbia Property Trust earned leasing override fees of $14,600 and $3,000, respectively. Such fees are included in management fee revenue on the accompanying consolidated statements of operations. Construction and Development Fee Income Under construction and development contracts in place with third-party properties and for certain properties owned by joint ventures and the Real Estate Funds, Columbia Property Trust earns fees related to construction and development project management and supervision, using a percentage of completion method, measured by the percentage of costs incurred to date as compared with the estimated total costs for each contract. For the three months ended March 31, 2020, Columbia Property Trust earned construction and development fees of $0.8 million. Such fees are included in management fee revenue on the accompanying consolidated statements of operations. Salary and Other Reimbursement Revenue Under the property management agreements for third-party-owned properties and certain properties owned through joint ventures and the Real Estate Funds, 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, 2020 and 2019, Columbia Property Trust earned salary and other reimbursement revenue of $3.1 million and $1.1 million, respectively. These amounts are included in management fee revenues in 2020, and in other property income in 2019, on the accompanying consolidated statements of operations. Miscellaneous Revenue Columbia Property Trust also receives revenues for services provided to its tenants through the TRS Entities, including fitness centers, shuttles, and cafeterias. For the three months ended March 31, 2020 and 2019, Columbia Property Trust earned miscellaneous revenue of $7,100 and $176,500, respectively. These amounts are included in other property income on the accompanying consolidated statements of operations.

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2020
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share For the three months ended March 31, 2020 and 2019, 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, 2020 and 2019 (in thousands): Three Months Ended 2020 2019 Net income attributable to common stockholders $ 6,290 $ 3,513 Distributions paid on unvested shares (113) (77) Net income attributable to common stockholders used to calculate basic and diluted earnings per share $ 6,177 $ 3,436 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, 2020 and 2019, respectively (in thousands): Three Months Ended 2020 2019 Weighted-average common shares – basic 114,471 116,462 Plus incremental weighted-average shares from time-vested conversions, less assumed stock repurchases: Previously granted awards, unvested 15 90 Future period LTI Plan awards — 328 Weighted-average common shares – diluted 114,486 116,880

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2020
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, 2020, Columbia Property Trust had the following reportable segments: New York, San Francisco, Washington, D.C., Boston, 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. Upon selling its remaining properties in Atlanta during 2019 and Los Angeles in March of 2020, Columbia Property Trust has combined Atlanta and the all other office markets reportable segment for all periods presented. 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 lease revenues 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, 2020 2019 New York (1) $ 41,105 $ 38,696 San Francisco (2) 34,801 27,763 Washington, D.C. (3) 15,018 14,130 Boston 4,149 3,674 All other office markets 2,587 17,060 Total office segments 97,660 101,323 Corporate (373) 786 Total operating revenues $ 97,287 $ 102,109 (1) Includes operating revenues for two unconsolidated properties, based on Columbia Property Trust's ownership interests: 49.5% for 114 Fifth Avenue for all periods presented; and 8.65% for Terminal Warehouse from March 13, 2020 through March 31, 2020. (2) Includes operating revenues for two unconsolidated properties, 333 Market Street and University Circle, based on Columbia Property Trust's ownership interests: 55.0% for all periods presented. (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 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, 2020 2019 Total revenues $ 76,254 $ 75,433 Operating revenues included in income from unconsolidated joint ventures (1) 29,273 28,545 Less: management fee revenue (2) (8,240) (1,869) Total operating revenues $ 97,287 $ 102,109 (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 12, 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, 2020 2019 New York (1) $ 25,075 $ 22,806 San Francisco (2) 25,072 20,497 Washington, D.C. (3) 9,151 8,453 Boston 2,458 1,989 All other office markets 1,525 13,106 Total office segments 63,281 66,851 Corporate (272) (205) Total NOI $ 63,009 $ 66,646 (1) Includes NOI for three 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 for all periods presented; and 8.65% for Terminal Warehouse from March 13, 2020 though March 31, 2020. (2) Includes NOI for two unconsolidated properties, 333 Market Street and University Circle, based on Columbia Property Trust's ownership interests: 55.0% for all periods presented. (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, 2020 2019 Net income attributable to common stockholders $ 6,290 $ 3,513 Management fee revenues (8,240) (1,869) Depreciation 18,330 20,404 Amortization 6,721 7,461 General and administrative – corporate 11,782 8,424 Management fee expenses 6,945 — General and administrative – joint ventures — 809 Acquisition costs 12,081 — Net interest expense 9,713 12,094 Income tax expense (2,243) 7 Adjustments included in income from unconsolidated joint ventures 14,903 15,803 Gain on sale of real estate assets (13,344) — Adjustments attributable to noncontrolling interests 71 — NOI $ 63,009 $ 66,646

Subsequent Event

Subsequent Event	3 Months Ended
	Mar. 31, 2020
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event The response to the COVID-19 pandemic continues to rapidly evolve, and aggressive actions taken to reduce the spread of the disease have seriously disrupted activities in large segments of the economy. Columbia Property Trust is monitoring the COVID-19 outbreak and its impact on the Company's business, tenants, and industry as a whole. While the extent to which COVID-19 impacts the Company's results will depend on future developments, the outbreak and associated economic impacts could result in a material impact to the Company's future financial condition, results of operations, and cash flows. Some effects could include lease modifications, deferral of rental income, and increased operating expenses. See Part II, Item 1A. Risk Factors , for additional information.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2020
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
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.
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 LessorUpon 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).
Investments in Unconsolidated Joint Ventures/Investments in Real Estate Funds/Noncontrolling Interests	Investments in Unconsolidated Joint Ventures Columbia Property Trust uses the equity method to account for investments that are not wholly owned and: (i) are considered variable interest entities where the Company is not the primary beneficiary, or (ii) in which the Company, along with its co-owners, possesses substantive participation rights, including management selection and termination, and the approval of significant capital and operating decisions. Under the equity method, investments in unconsolidated joint ventures are recorded at cost and adjusted for cash contributions and distributions, and allocations of income or loss. Investments in Real Estate Funds In connection with the Normandy Acquisition described in Note 3, Transactions , Columbia Property Trust acquired general partnership interests and limited partnership interests in three real estate funds: Normandy Real Estate Fund III, LP; Normandy Real Estate Fund IV, LP; and Normandy Opportunity Zone Fund, LP (collectively, the "Real Estate Funds"). The Company owns minimal economic interests in the Real Estate Funds (ranging from 2.0% to 2.5%). Significant decision rights are shared between the general partners and limited partners; and the general partner can be removed with a majority vote from the limited partners. As a result, Columbia Property Trust accounts for its investments in the Real Estate Funds using the equity method. The Real Estate Funds are subject to the rules of the AICPA Investment Company Guide; as a result, GAAP requires the Company to record its investments in the Real Estate Funds at their respective estimated fair market values. The Company determines the Real Estate Funds' estimated net asset values per share using a discounted cash flow model, which is considered a Level 3 valuation technique (see Fair Value Measurements section above). As of March 31, 2020, investments in the Real Estate Funds of approximately $3.8 million are included in prepaid expenses and other assets on the accompanying consolidated balance sheet. From January 24, 2020 (date of acquisition) through March 31, 2020, Columbia Property Trust recognized an unrealized loss on its investments in Real Estate Funds of approximately $160,000, which is recorded as other income (loss) in the accompanying consolidated statements of operations. Columbia Property Trust has entered into agreements to provide acquisition, disposition, investment management, property management, leasing, and other services to the properties in which the Real Estate Funds own interests. See Note 12, Non-Lease Revenues , for more details. From time to time, Columbia Property Trust may be required to make additional capital contributions to the Real Estate Funds. See Note 7, Commitments and Contingencies , for more details.
Goodwill	Goodwill Goodwill represents purchase price not specifically assigned to assets acquired and liabilities assumed in a business combination. On January 24, 2020, Columbia Property Trust recorded goodwill of $63.8 million in connection with the Normandy Acquisition (see Note 3, Transactions for details). Columbia Property Trust assesses the recoverability of goodwill on an annual basis, and on an interim basis if an event occurs or circumstances change that would indicate that the carrying value of goodwill may be impaired. When indicators of potential impairment exist, Columbia evaluates whether the carrying value of the reporting unit to which the goodwill relates exceeds the reporting unit's estimated fair value. If the reporting unit's carrying value exceeds its estimated fair value, Columbia Property Trust would then perform the same assessment at the enterprise level. If the carrying value of Columbia Property Trust's equity exceeds the estimated fair value of the Company, then goodwill would be reduced, and an impairment loss would be recognized, for the amount of this excess (not to exceed total goodwill). Columbia Property Trust has determined that the carrying value of goodwill is recoverable as of March 31, 2020.
Interest Rate Swap Agreements	Interest Rate Swap AgreementsColumbia 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 and currently does not have any derivatives that are not designated as hedges; however, certain of its derivatives may, at times, 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 (loss). 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, the Company 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, the Company would be subject to federal and state corporate income tax on the undistributed income. Generally, the Company 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; Columbia Development TRS 13, LLC; and Columbia Development TRS 87, LLC (collectively, the "TRS Entities") are subsidiaries of the Company and are organized as Delaware limited liability companies. The TRS Entities, among other things, provide services related to asset and property management, construction and development, and other tenant services that Columbia Property Trust, as a REIT, cannot otherwise provide. The Company 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 the Company 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, the Company records interest and penalties related to uncertain tax positions as general and administrative expense in the accompanying consolidated statements of operations.
Reclassification	Reclassification Certain prior-period amounts on our consolidated statement of operations have been reclassified to conform with current-period's presentation: property operating costs includes amounts previously reported as asset and property management fees.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Accounting Standard Update 2020-04, Reference Rate Reform ("ASC 2020-04"), which was issued on and effective as of March 12, 2020, addresses the accounting and disclosure impacts of reference rate reform and the anticipated discontinuance of London Interbank Offering Rate ("LIBOR"). ASU 2020-04 provides optional guidance that may be elected over time, and includes practical expedients for activities that impact debt, leases, derivatives, and other contracts. Columbia Property Trust has matched LIBOR-based debt with LIBOR-based interest rate swaps, and has elected to apply the ASU 2020-04's practical expedients related to (i) probability and (ii) the assessment of the effectiveness for future LIBOR-indexed cash flows, which assume that the debt instrument will use the same index rate as its corresponding interest rate swap once a new reference rate is established to replace LIBOR. Application of these expedients preserves the effectiveness of our interest rate swaps as cash flow hedges in the event that our debt and interest rate swaps are not amended concurrently to reflect a new reference rate. Columbia Property Trust continues to evaluate the impact of the guidance and may apply other elections as additional reference rate changes occur. ASU 2020-04 did not have a material impact on Columbia Property Trust's consolidated financial statements or disclosures. Accounting Standard Update 2018-13 , Fair Value Measurement: Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement ("ASU 2018-13"), which became effective for Columbia Property Trust on January 1, 2020, is intended to improve the effectiveness of disclosures required by entities regarding recurring and nonrecurring fair value measurements by removing, modifying, or adding certain disclosures. ASU 2018-13 did not have a material impact on Columbia Property Trust's consolidated financial statements or disclosures. Recent Disclosure Pronouncement The SEC's Final Rule Release No. 33-10762, Financial Disclosures About Guarantors and Issuers of Guaranteed Securities and Affiliates Whose Securities Collateralize a Registrant's Securities (the "SEC Release No. 33-10762") was issued on March 2, 2020 and adopted by Columbia Property Trust in the first quarter of 2020. With respect to the disclosure requirements for subsidiary issuers and guarantors of registered debt securities, SEC Release No. 33-10762 amends SEC Rule 3-10 by, among other things: • Simplifying the criteria that must be met for a parent registrant to qualify for an exemption allowing it to provide summarized financial information in lieu of standalone audited financial statements of the subsidiary issuer, including replacing the requirement that a subsidiary issuer be wholly owned by the parent guarantor with a requirement that the subsidiary issuer be consolidated in the parent guarantor’s financial statements. • Upon qualifying for the exemption above, replacing the previous requirement to include condensed consolidating financial information in the registrant's (parent guarantor's) financial statements, with a requirement to include certain summarized financial information (Alternative Disclosures) in either the registrant's financial statement footnotes or in its Management’s Discussion and Analysis. Our Bonds Payable (see Note 6., Bond Payable) were issued by Columbia OP, and are fully and unconditionally guaranteed by Columbia Property Trust and by no other party. Columbia Property Trust owns 97.2% of Columbia OP, and includes the accounts of Columbia OP in its consolidated financial statements. Therefore, upon adopting SEC Release No. 33-10762 this quarter, we are providing Alternative Disclosures in the Management's Discussion and Analysis section of this Form 10-Q.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2020
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
Assets and Liabilities Held For Sale	The major classes of assets and liabilities classified as held for sale as of December 31, 2019, are provided below (in thousands): December 31, 2019 Real Estate Assets Held for Sale: Real estate assets, at cost: Land $ 57,117 Buildings and improvements, less accumulated depreciation of $80,543 157,701 Construction in progress 138 Total real estate assets held for sale, net $ 214,956 Other Assets Held for Sale: Tenant receivables $ 156 Straight-line rent receivable 12,591 Prepaid expenses and other assets 334 Deferred lease costs, less accumulated amortization of $10,222 10,836 Total other assets held for sale, net $ 23,917 Liabilities Held for Sale: Accounts payable, accrued expenses, and accrued capital expenditures $ 1,151 Deferred income 1,903 Total liabilities held for sale $ 3,054 During 2020 and 2019, Columbia Property Trust sold the following properties, or partial interests in properties of unconsolidated joint ventures. Additional information for certain of the disposition transactions is provided below the table. Property Location Date % Sold Sales Price (1) (in thousands) Gain (loss) on Sale 2020 Pasadena Corporate Park Los Angeles, CA March 31, 2020 100 % $ 78,000 $ (83) Cranberry Woods Drive Pittsburgh, PA January 16, 2020 100 % $ 180,000 $ 13,428 2019 Lindbergh Center Atlanta, GA September 26, 2019 100 % $ 187,000 $ — One & Three Glenlake Parkway Atlanta, GA April 15, 2019 100 % $ 227,500 $ 42,030 (1) Exclusive of transaction costs and price adjustments.
Schedule of Intangible Assets and Liabilities	As of March 31, 2020 and December 31, 2019, 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 Intangible Above-Market Absorption March 31, 2020 Gross $ 2,480 $ 115,596 $ 60,338 $ 36,287 Accumulated Amortization (1,245) (59,549) (33,952) (16,043) Net $ 1,235 $ 56,047 $ 26,386 $ 20,244 December 31, 2019 Gross $ 2,481 $ 117,203 $ 61,702 $ 36,966 Accumulated Amortization (1,202) (57,457) (33,731) (15,127) Net $ 1,279 $ 59,746 $ 27,971 $ 21,839 Amortization of Intangible Assets and Liabilities Arising From In-Place Leases For the three months ended March 31, 2020 and 2019, Columbia Property Trust recognized the following amortization of intangible lease assets and liabilities (in thousands): Intangible Lease Assets Intangible Intangible Above-Market Absorption For the Three Months Ended March 31, 2020 $ 43 $ 3,700 $ 1,586 $ 1,596 For the Three Months Ended March 31, 2019 $ 82 $ 3,656 $ 2,100 $ 1,426 The net intangible assets and liabilities remaining as of March 31, 2020 will be amortized as follows, excluding amounts held for sale, if applicable (in thousands): Intangible Lease Assets Intangible Intangible Above-Market Absorption For the remainder of 2020 $ 129 $ 9,219 $ 4,296 $ 3,888 For the years ending December 31: 2021 172 9,328 4,516 3,191 2022 172 7,959 3,429 2,910 2023 172 6,455 2,903 2,336 2024 172 5,594 2,586 1,990 2025 172 4,083 1,921 1,364 Thereafter 246 13,409 6,735 4,565 $ 1,235 $ 56,047 $ 26,386 $ 20,244
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 $ — $ 551 Interest rate contracts Accounts payable $ 21,094 $ 1,652
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position	Three Months Ended 2020 2019 Market value adjustment to interest rate swaps designated as hedging instruments and included in other comprehensive income (loss) $ (19,993) $ (1,431)

Transactions (Tables)

Transactions (Tables)	3 Months Ended
	Mar. 31, 2020
Real Estate [Abstract]
Schedule of Properties Acquired	The initial purchase consideration was allocated as follows (in thousands): January 24, 2020 Goodwill $ 63,806 Prepaid expenses and other assets (1) 7,670 Cash 1,260 Operating lease assets 934 Investments in unconsolidated joint ventures (2) 419 Accounts payable, accrued expenses, and accrued capital expenditures (2,881) Operating lease liabilities (934) Deferred income (77) Total initial purchase consideration $ 70,197 (1) Prepaid expenses and other assets includes $3.7 million of investments in Real Estate Funds, as described in Note 2, Summary of Significant Accounting Policies . (2) Reflects interests in five unconsolidated joint ventures that earn fees for providing management services to properties affiliated with the Real Estate Funds. Real Estate Acquisitions Property Location Date Percent Acquired Purchase Price (in thousands) (1) 2020 Terminal Warehouse New York, NY March 13, 2020 8.65 % $ 40,048 (2) 2019 201 California Street San Francisco, CA December 9, 2019 100.00 % $ 238,900 101 Franklin Street (3) New York, NY December 2, 2019 92.50 % $ 205,500 (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) This property is owned through an unconsolidated joint venture. Purchase price is for Columbia Property Trust's partial interest in the property.
Schedule of Purchase Price Allocations for Consolidated Property Acquisitions	Purchase Price Allocations for Consolidated Property Acquisitions 201 California Street 101 Franklin Street (1) (in thousands) (in thousands) Location San Francisco, CA New York, NY Date Acquired December 9, 2019 December 2, 2019 Purchase Price: Land $ 77,833 $ 57,145 Building and improvements 157,513 149,500 Intangible lease assets 13,241 — Intangible lease origination costs 5,785 — Intangible below market lease liability (8,064) — Total purchase price $ 246,308 $ 206,645 (1) Owned through a consolidated joint venture, in which Columbia Property Trust owns a 92.5% interest.
Schedule of Pro Forma Information	The following unaudited pro forma financial information for Columbia Property Trust has been prepared for informational purposes only and is not necessarily indicative of future results or of actual results that would have been achieved had these acquisitions been consummated as of January 1, 2018 (in thousands): For the Three Months Ended March 31, 2019 Revenues $ 79,656 Net income attributable to common stockholders of Columbia Property Trust $ 5,736
Schedule of Properties Sold	The major classes of assets and liabilities classified as held for sale as of December 31, 2019, are provided below (in thousands): December 31, 2019 Real Estate Assets Held for Sale: Real estate assets, at cost: Land $ 57,117 Buildings and improvements, less accumulated depreciation of $80,543 157,701 Construction in progress 138 Total real estate assets held for sale, net $ 214,956 Other Assets Held for Sale: Tenant receivables $ 156 Straight-line rent receivable 12,591 Prepaid expenses and other assets 334 Deferred lease costs, less accumulated amortization of $10,222 10,836 Total other assets held for sale, net $ 23,917 Liabilities Held for Sale: Accounts payable, accrued expenses, and accrued capital expenditures $ 1,151 Deferred income 1,903 Total liabilities held for sale $ 3,054 During 2020 and 2019, Columbia Property Trust sold the following properties, or partial interests in properties of unconsolidated joint ventures. Additional information for certain of the disposition transactions is provided below the table. Property Location Date % Sold Sales Price (1) (in thousands) Gain (loss) on Sale 2020 Pasadena Corporate Park Los Angeles, CA March 31, 2020 100 % $ 78,000 $ (83) Cranberry Woods Drive Pittsburgh, PA January 16, 2020 100 % $ 180,000 $ 13,428 2019 Lindbergh Center Atlanta, GA September 26, 2019 100 % $ 187,000 $ — One & Three Glenlake Parkway Atlanta, GA April 15, 2019 100 % $ 227,500 $ 42,030 (1) Exclusive of transaction costs and price adjustments.

Unconsolidated Joint Ventures (

Unconsolidated Joint Ventures (Tables)	3 Months Ended
	Mar. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]
Summary of Financial Information for the Joint Ventures	As of March 31, 2020 and December 31, 2019, Columbia Property Trust owned interests in the following properties through joint ventures, which are accounted for using the equity method of accounting (in thousands): Carrying Value of Investment (1) Joint Venture Property Name Geographic Market Ownership Interest March 31, 2020 December 31, 2019 Market Square Joint Venture Market Square Washington, D.C. 51.00 % $ 136,481 $ 135,557 University Circle Joint Venture University Circle San Francisco 55.00 % 281,457 283,633 333 Market Street Joint Venture 333 Market Street San Francisco 55.00 % 268,438 269,638 114 Fifth Avenue Joint Venture 114 Fifth Avenue New York 49.50 % 83,726 87,750 1800 M Street Joint Venture 1800 M Street Washington, D.C. 55.00 % 230,570 233,196 799 Broadway Joint Venture (2) 799 Broadway New York, NY 49.70 % 46,620 44,686 Terminal Warehouse Joint Venture Terminal Warehouse New York, NY 8.65 % 39,724 — Real Estate Services Joint Ventures (3) n/a (3) n/a (3) Various (3) 678 — $ 1,087,694 $ 1,054,460 (1) Includes basis differences. There is an aggregate net difference of $288.9 million and $279.2 million as of March 31, 2020 and December 31, 2019, 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) Columbia Property Trust capitalized interest of $0.4 million and $0.3 million on its investment in the 799 Broadway Joint Venture during the three months ended March 31, 2020 and 2019, respectively. (3) Columbia Property Trust owns interests in the following five unconsolidated joint ventures that earn fees for providing management services to properties affiliated with the Real Estate Funds (the "Real Estate Services Joint Ventures"): L&L Normandy Terminal Asset Manager, LLC (67%); L&L Normandy Terminal Development Manager, LLC (50%); L&L Normandy Terminal Property Manager (50%) (collectively, the "Terminal Services Joint Ventures"); WNK Maiden Management (50%); and Maple AB Services, LLC (55%). The Terminal Services Joint Ventures earn fees from providing services to the Terminal Warehouse Joint Venture.
Summary of 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, December 31, 2019 March 31, December 31, 2019 March 31, December 31, 2019 Market Square Joint Venture $ 579,363 $ 582,747 $ 324,828 (2) $ 324,815 $ 242,942 $ 241,719 University Circle Joint Venture 217,185 216,546 — — 211,218 212,656 333 Market Street Joint Venture 364,893 367,652 — — 349,936 352,385 114 Fifth Avenue Joint Venture 476,785 485,442 — — 119,831 127,554 1800 M Street Joint Venture 429,767 437,439 — — 416,836 421,588 799 Broadway Joint Venture 220,024 201,210 119,156 (3) 109,735 88,374 85,316 Terminal Warehouse 1,042,748 — 618,766 (4) — 339,319 — Real Estate Services Joint Ventures 2,495 — — — 1,198 — $ 3,333,260 $ 2,291,036 $ 1,062,750 $ 434,550 $ 1,769,654 $ 1,441,218 (1) Excludes basis differences (see footnote (1) to the Carrying Value of Investment table above), which are amortized to income (loss) from unconsolidated joint ventures over the lives of the underlying assets of 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. (3) Reflects $122.1 million outstanding, net of $3.0 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 Commitments and Contingencies . (4) Reflects $625.5 million outstanding, net of $6.7 million of net unamortized deferred financing costs, on the Terminal Warehouse acquisition loan. The Terminal Warehouse Joint Venture has an interest-only acquisition loan with a total capacity of $650.0 million. The Terminal Warehouse acquisition loan bears interest at LIBOR plus 340 basis points and matures on October 23, 2020, with a one Summarized income statement information for the unconsolidated joint ventures for the three months ended March 31, 2020 and 2019 is as follows (in thousands): Total Revenues Net Income (Loss) Columbia Property Trust's Share of Net Income (Loss) (1) 2020 2019 2020 2019 2020 2019 Market Square Joint Venture $ 12,690 $ 11,337 $ (1,994) $ (2,595) $ (1,017) $ (1,323) University Circle Joint Venture 10,924 11,272 5,715 6,364 3,144 3,500 333 Market Street Joint Venture 7,067 7,054 3,705 3,713 2,037 2,042 114 Fifth Avenue Joint Venture 10,428 10,919 (2,653) (2,506) (1,314) (1,240) 1800 M Street Joint Venture 9,937 9,454 1,752 388 964 214 799 Broadway Joint Venture — — (32) (526) (16) (262) Terminal Warehouse 2,307 — (3,741) — (324) — Real Estate Services Joint Ventures 1,875 — 938 — 341 — $ 55,228 $ 50,036 $ 3,690 $ 4,838 $ 3,815 $ 2,931 (1) Excludes amortization of basis differences (see footnote to (1) the Carrying Value of Investment table above), which are recorded as income (loss) from unconsolidated joint ventures in the accompanying consolidated statements of operations.
Summary of Fees Earned from Unconsolidated Joint Ventures	During the three months ended March 31, 2020 and 2019, Columbia Property Trust earned the following fees from its unconsolidated joint ventures (in thousands): Three Months Ended 2020 2019 Market Square Joint Venture $ 574 $ 568 University Circle Joint Venture 587 574 333 Market Street Joint Venture 214 207 1800 M Street Joint Venture 555 520 799 Broadway Joint Venture 223 — $ 2,153 $ 1,869

Line of Credit and Notes Paya_2

Line of Credit and Notes Payable (Tables)	3 Months Ended
	Mar. 31, 2020
Debt Disclosure [Abstract]
Schedule of Line of Credit and Notes Payable Indebtedness	As of March 31, 2020 and December 31, 2019, 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 $ 501,000 $ 334,000 $300 Million Term Loan 300,000 300,000 $150 Million Term Loan 150,000 150,000 Less: Deferred financing costs related to term loans and notes payable, net of accumulated amortization (1,930) (2,084) $ 949,070 $ 781,916

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2020
Equity [Abstract]
Summary of the Activity of Employee Stock Grants	Below is a summary of the employee awards issued under the LTI Plan during the three months ended March 31, 2020: Time-Based Awards Performance-Based Awards Restricted Shares Weighted-Average Grant-Date Fair Value (1) RSUs Weighted-Average Grant-Date Fair Value (2) Unvested awards – beginning of period 374 $ 20.96 584 $ 18.86 Granted 295 $ 21.06 303 $ 18.06 Converted (3) 33 (33) Vested (166) $ 21.22 (101) $ 18.48 Forfeited — $ — (9) $ 20.49 Unvested awards – end of period (4) 536 $ 20.94 744 $ 18.58 (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) Reflects 25% of the 2017 3-year Performance-Based RSUs granted on January 1, 2017, which converted to Time-Based Restricted shares in January 2020 and will vest in January 2021. (4) As of March 31, 2020, Columbia Property Trust expects approximately 514,000 of the 536,000 unvested restricted stock units to ultimately vest and approximately 713,000 of the 744,000 unvested Performance-Based RSUs to ultimately vest, assuming a weighted-average forfeiture rate of 4.1%, which was determined based on historical forfeiture rates.
Schedule of Director Stock Grants	During the three months ended March 31, 2020 and 2019, Columbia Property Trust made the following equity retainer grant: Date of Grant Shares Grant-Date Fair Value March 2, 2020 (1) 591 $ 19.80 (1) In March 2020, a new director was appointed to the board of directors of Columbia Property Trust. The new director received a pro-rated annual equity retainer grant at appointment.
Schedule of Stock-based Compensation Expense Incurred	For the three months ended March 31, 2020 and 2019, Columbia Property Trust incurred stock-based compensation expense related to the following events (in thousands): Three Months Ended 2020 2019 Amortization of time-based awards $ 947 $ 884 Amortization of performance-based awards (1) 1,031 655 Amortization of Preferred OP unit awards issued in connection with the Normandy Acquisition 2,358 — Issuance of shares to independent directors 12 — Total stock-based compensation expense $ 4,348 $ 1,539 (1) Reflects amortization of awards made under the LTI Plan that will vest in future periods for service during the current period.

Supplemental Disclosures of N_2

Supplemental Disclosures of Noncash Investing and Financing Activities (Tables)	3 Months Ended
	Mar. 31, 2020
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, 2020 and 2019 (in thousands): Three Months Ended 2020 2019 Other assets assumed at acquisition $ 245 $ — Operating lease liability assumed at acquisition $ 961 $ 34,791 Other liabilities assumed at acquisition $ 245 $ — Amortization of net discounts on debt $ 45 $ 45 Accrued investments in unconsolidated joint ventures $ — $ 88 Accrued capital expenditures and deferred lease costs $ 15,447 $ 19,603 Market value adjustments to interest rate swaps that qualify for hedge accounting treatment $ (19,993) $ (1,431) Issuance of Preferred OP Units for the Normandy Acquisition (Note 3) $ 55,306 $ — Stock-based compensation expense $ 4,348 $ 1,539

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2020
Leases [Abstract]
Summary of Fixed and Variable Revenues	Fixed and variable payments for the three months ended March 31, 2020 are as follows (in thousands): For the Three Months Ended March 31, 2020 2019 Fixed payments $ 61,243 $ 65,517 Variable payments 6,764 6,345 Total lease revenues $ 68,007 $ 71,862

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2020
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, 2020 and 2019 (in thousands): Three Months Ended 2020 2019 Net income attributable to common stockholders $ 6,290 $ 3,513 Distributions paid on unvested shares (113) (77) Net income attributable to common stockholders used to calculate basic and diluted earnings per share $ 6,177 $ 3,436 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, 2020 and 2019, respectively (in thousands): Three Months Ended 2020 2019 Weighted-average common shares – basic 114,471 116,462 Plus incremental weighted-average shares from time-vested conversions, less assumed stock repurchases: Previously granted awards, unvested 15 90 Future period LTI Plan awards — 328 Weighted-average common shares – diluted 114,486 116,880

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2020
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, 2020 2019 New York (1) $ 41,105 $ 38,696 San Francisco (2) 34,801 27,763 Washington, D.C. (3) 15,018 14,130 Boston 4,149 3,674 All other office markets 2,587 17,060 Total office segments 97,660 101,323 Corporate (373) 786 Total operating revenues $ 97,287 $ 102,109 (1) Includes operating revenues for two unconsolidated properties, based on Columbia Property Trust's ownership interests: 49.5% for 114 Fifth Avenue for all periods presented; and 8.65% for Terminal Warehouse from March 13, 2020 through March 31, 2020. (2) Includes operating revenues for two unconsolidated properties, 333 Market Street and University Circle, based on Columbia Property Trust's ownership interests: 55.0% for all periods presented. (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 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, 2020 2019 Total revenues $ 76,254 $ 75,433 Operating revenues included in income from unconsolidated joint ventures (1) 29,273 28,545 Less: management fee revenue (2) (8,240) (1,869) Total operating revenues $ 97,287 $ 102,109 (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 12, 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, 2020 2019 New York (1) $ 25,075 $ 22,806 San Francisco (2) 25,072 20,497 Washington, D.C. (3) 9,151 8,453 Boston 2,458 1,989 All other office markets 1,525 13,106 Total office segments 63,281 66,851 Corporate (272) (205) Total NOI $ 63,009 $ 66,646 (1) Includes NOI for three 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 for all periods presented; and 8.65% for Terminal Warehouse from March 13, 2020 though March 31, 2020. (2) Includes NOI for two unconsolidated properties, 333 Market Street and University Circle, based on Columbia Property Trust's ownership interests: 55.0% for all periods presented. (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, 2020 2019 Net income attributable to common stockholders $ 6,290 $ 3,513 Management fee revenues (8,240) (1,869) Depreciation 18,330 20,404 Amortization 6,721 7,461 General and administrative – corporate 11,782 8,424 Management fee expenses 6,945 — General and administrative – joint ventures — 809 Acquisition costs 12,081 — Net interest expense 9,713 12,094 Income tax expense (2,243) 7 Adjustments included in income from unconsolidated joint ventures 14,903 15,803 Gain on sale of real estate assets (13,344) — Adjustments attributable to noncontrolling interests 71 — NOI $ 63,009 $ 66,646

Organization (Details)

Organization (Details) ft² in Thousands	3 Months Ended
	Mar. 31, 2020ft²property
Real Estate Properties [Line Items]
Square feet of real estate | ft²	6,300
Percent of leased office space of owned properties	97.60%
Columbia Operating Partnership
Real Estate Properties [Line Items]
General partner and majority owner, percentage	97.20%
Office Building
Real Estate Properties [Line Items]
Number of real estate properties	15
Number of properties under development	4
Asset and Property Management Services Office Space
Real Estate Properties [Line Items]
Square feet of real estate | ft²	8,000
Wholly Owned Properties | Office Building
Real Estate Properties [Line Items]
Number of real estate properties	11
Unconsolidated Properties | Office Building
Real Estate Properties [Line Items]
Number of real estate properties	8

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (Narrative) (Details)	2 Months Ended	3 Months Ended
	Mar. 31, 2020USD ($)investmentinterestRateSwap	Mar. 31, 2020USD ($)investmentinterestRateSwap	Mar. 31, 2019USD ($)	Jan. 24, 2020USD ($)	Dec. 31, 2019USD ($)
Property, Plant and Equipment [Line Items]
Capitalized interest costs		$ 2,600,000	$ 900,000
Intangible lease assets, accumulated amortization	$ 60,794,000	60,794,000			$ 58,659,000
Goodwill	$ 63,806,000	63,806,000			0
Hedge ineffectiveness recognized in earnings		$ 0	0
Requirement to distribute taxable income (at least)	90.00%	90.00%
Limit on investments in taxable real estate investment trusts (percent)	20.00%	20.00%
Columbia Operating Partnership
Property, Plant and Equipment [Line Items]
General partner and majority owner, percentage		97.20%
Normandy Acquisition
Property, Plant and Equipment [Line Items]
Goodwill				$ 63,806,000
Real Estate Funds
Property, Plant and Equipment [Line Items]
Carrying Value of Investment	$ 3,800,000	$ 3,800,000
Unrealized loss on investments in real estate funds	$ 160,000
Real Estate Funds | Normandy
Property, Plant and Equipment [Line Items]
Number of real estate funds | investment	3	3
Minimum | Real Estate Funds | Normandy
Property, Plant and Equipment [Line Items]
Economic interest percentage		2.00%
Maximum | Real Estate Funds | Normandy
Property, Plant and Equipment [Line Items]
Economic interest percentage		2.50%
Building
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		$ 400,000	$ 300,000
Carrying Value of Investment	$ 1,087,694,000	$ 1,087,694,000			$ 1,054,460,000
Interest Rate Swap
Property, Plant and Equipment [Line Items]
Number of derivative instruments held | interestRateSwap	2	2
Notional amount	$ 450,000,000	$ 450,000,000

Summary of Significant Accoun_5

Summary of Significant Accounting Policies (Assets and Liabilities Held for sale) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Land		$ 57,117
Buildings and improvements, less accumulated depreciation of $80,543		157,701
Construction in progress		138
Total real estate assets held for sale, net		214,956
Tenant receivables		156
Straight-line rent receivable		12,591
Prepaid expenses and other assets		334
Deferred lease costs, less accumulated amortization of $10,222		10,836
Total other assets held for sale, net	$ 0	23,917
Accounts payable, accrued expenses, and accrued capital expenditures		1,151
Deferred income		1,903
Total liabilities held for sale		3,054
Buildings and improvements, accumulated depreciation		80,543
Deferred lease costs, accumulated amortization		$ 10,222

Summary of Significant Accoun_6

Summary of Significant Accounting Policies (Schedule of Intangible Assets & Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Gross Intangible In-Place Lease Assets and Liabilities [Abstract]
Intangible Lease Assets, Accumulated Amortization	$ (60,794)	$ (58,659)
Intangible lease assets, net	57,282	61,025
Intangible Lease Origination Costs, Accumulated Amortization	(33,952)	(33,731)
Intangible Lease Origination Costs, Net	26,386	27,971
Below Market Lease, Gross	36,287	36,966
Below Market Lease, Accumulated Amortization	(16,043)	(15,127)
Below Market Lease, Net	20,244	21,839
Above-Market In-Place Lease Assets
Gross Intangible In-Place Lease Assets and Liabilities [Abstract]
Intangible Lease Assets, Gross	2,480	2,481
Intangible Lease Assets, Accumulated Amortization	(1,245)	(1,202)
Intangible lease assets, net	1,235	1,279
Absorption Period Costs
Gross Intangible In-Place Lease Assets and Liabilities [Abstract]
Intangible Lease Assets, Gross	115,596	117,203
Intangible Lease Assets, Accumulated Amortization	(59,549)	(57,457)
Intangible lease assets, net	56,047	59,746
Intangible Lease Origination Costs
Gross Intangible In-Place Lease Assets and Liabilities [Abstract]
Intangible Lease Origination Costs, Gross	60,338	61,702
Intangible Lease Origination Costs, Accumulated Amortization	(33,952)	(33,731)
Intangible Lease Origination Costs, Net	$ 26,386	$ 27,971

Summary of Significant Accoun_7

Summary of Significant Accounting Policies (Schedule of Recognized Amortization) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Lease Assets	$ 6,721	$ 7,461
Intangible Below-Market In-Place Lease Liabilities	1,596	1,426
Above-Market In-Place Lease Assets
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Lease Assets	43	82
Absorption Period Costs
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Lease Assets	3,700	3,656
Intangible Lease Origination Costs
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Lease Assets	$ 1,586	$ 2,100

Summary of Significant Accoun_8

Summary of Significant Accounting Policies (Schedule of Future Amortization by Intangible Asset Class) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
For the Years Ending December 31:
Intangible lease assets, net	$ 57,282	$ 61,025
Intangible Lease Origination Costs, Net	26,386	27,971
Intangible Below-Market In-Place Lease Liabilities
For the remainder of 2020	3,888
For the years ending December 31:
2021	3,191
2022	2,910
2023	2,336
2024	1,990
2025	1,364
Thereafter	4,565
Below Market Lease, Net	20,244	21,839
Above-Market In-Place Lease Assets
Finite-Lived Intangible Assets [Line Items]
For the remainder of 2020	129
For the Years Ending December 31:
2021	172
2022	172
2023	172
2024	172
2025	172
Thereafter	246
Intangible lease assets, net	1,235	1,279
Absorption Period Costs
Finite-Lived Intangible Assets [Line Items]
For the remainder of 2020	9,219
For the Years Ending December 31:
2021	9,328
2022	7,959
2023	6,455
2024	5,594
2025	4,083
Thereafter	13,409
Intangible lease assets, net	56,047	59,746
Intangible Lease Origination Costs
Finite-Lived Intangible Assets [Line Items]
For the remainder of 2020	4,296
For the Years Ending December 31:
2021	4,516
2022	3,429
2023	2,903
2024	2,586
2025	1,921
Thereafter	6,735
Intangible Lease Origination Costs, Net	$ 26,386	$ 27,971

Summary of Significant Accoun_9

Summary of Significant Accounting Policies (Interest Rate Swaps) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Summary of Derivative Instruments Impact on Results of Operations [Abstract]
Market value adjustment to interest rate swaps designated as hedging instruments and included in other comprehensive income (loss)	$ (19,993)	$ (1,431)
Interest rate contracts | Prepaid expenses and other assets
Derivative, Fair Value, Net [Abstract]
Derivative designated as hedging instruments	0		$ 551
Interest rate contracts | Accounts payable
Derivative, Fair Value, Net [Abstract]
Derivative designated as hedging instruments	$ 21,094		$ 1,652

Transactions (Acquisitions Narr

Transactions (Acquisitions Narrative) (Details) $ / shares in Units, $ in Thousands	Mar. 13, 2020USD ($)ft²	Jan. 24, 2020USD ($)component$ / sharesshares	Dec. 09, 2019USD ($)ft²Tenant	Dec. 02, 2019USD ($)ft²	Dec. 31, 2019USD ($)	Mar. 31, 2020USD ($)ft²	Mar. 31, 2020USD ($)ft²	Mar. 31, 2019USD ($)
Business Acquisition [Line Items]
Compensation expense							$ 4,348	$ 1,539
Square feet of real estate | ft²						6,300,000	6,300,000
Terminal Warehouse | Corporate Joint Venture
Business Acquisition [Line Items]
General partnership interest	33.00%
Economic interest	8.65%					8.65%	8.65%
Square feet of real estate | ft²	1,200,000
Debt term	2 years
Maximum borrowing capacity	$ 650,000
Outstanding balance						$ 625,500	$ 625,500
Extension term							1 year
Preferred OP Units
Business Acquisition [Line Items]
Vesting period		4 years
Normandy Acquisition
Business Acquisition [Line Items]
Number of components | component		2
Cash payment		$ 14,000
Transaction costs related to acquisition						12,100	$ 12,100
Additional revenue since acquisition date						5,200
Net income since acquisition date						$ 700
Normandy Acquisition | Preferred OP Units
Business Acquisition [Line Items]
Number of shares to be issued for acquisition (in shares) | shares		3,264,151
Liquidation preference (in dollars per share) | $ / shares		$ 26.50
Estimated fair value (in dollars per share) | $ / shares		$ 24.43
Compensation expense		$ 24,400
Vesting period		4 years
201 California Street
Business Acquisition [Line Items]
Purchase price			$ 238,900
Additional revenue since acquisition date					$ 1,400
Net income since acquisition date					$ 100
Square feet of real estate | ft²			252,000
Leased percentage			99.00%
Number of tenants | Tenant			34
Ownership percentage			100.00%
201 California Street | First Republic Bank | Customer Concentration Risk
Business Acquisition [Line Items]
Concentration risk, percentage			13.00%
201 California Street | Dow Jones & Company, Inc. | Customer Concentration Risk
Business Acquisition [Line Items]
Concentration risk, percentage			12.00%
201 California Street | Cooper, White & Cooper, LLP | Customer Concentration Risk
Business Acquisition [Line Items]
Concentration risk, percentage			12.00%
101 Franklin Street
Business Acquisition [Line Items]
Purchase price				$ 205,500
Square feet of real estate | ft²				235,000
Ownership percentage				92.50%

Transactions (Purchase Price Al

Transactions (Purchase Price Allocation) (Details) $ in Thousands	Mar. 31, 2020USD ($)	Jan. 24, 2020USD ($)joint_venture	Dec. 31, 2019USD ($)	Dec. 09, 2019USD ($)	Dec. 02, 2019USD ($)
Business Acquisition [Line Items]
Goodwill	$ 63,806		$ 0
Normandy Acquisition
Business Acquisition [Line Items]
Goodwill		$ 63,806
Prepaid expenses and other assets		7,670
Cash		1,260
Operating lease assets		934
Investments in unconsolidated joint ventures		419
Accounts payable, accrued expenses, and accrued capital expenditures		(2,881)
Operating lease liabilities		(934)
Deferred income		(77)
Total initial purchase consideration		70,197
Investments in real estate funds		$ 3,700
Number of unconsolidated joint ventures | joint_venture		5
201 California Street
Business Acquisition [Line Items]
Land				$ 77,833
Building and improvements				157,513
Intangible below market lease liability				(8,064)
Total initial purchase consideration				$ 246,308
Ownership Interest				100.00%
201 California Street | Leases, Acquired-in-Place
Business Acquisition [Line Items]
Intangible lease				$ 13,241
201 California Street | Intangible Lease Origination Costs
Business Acquisition [Line Items]
Intangible lease				$ 5,785
101 Franklin Street
Business Acquisition [Line Items]
Land					$ 57,145
Building and improvements					149,500
Intangible below market lease liability					0
Total initial purchase consideration					$ 206,645
Ownership Interest					92.50%
101 Franklin Street | Leases, Acquired-in-Place
Business Acquisition [Line Items]
Intangible lease					$ 0
101 Franklin Street | Intangible Lease Origination Costs
Business Acquisition [Line Items]
Intangible lease					$ 0

Transactions (Pro Forma Informa

Transactions (Pro Forma Information) (Details) - 201 California Street and 101 Franklin Street $ in Thousands	3 Months Ended
	Mar. 31, 2020USD ($)
Business Acquisition [Line Items]
Revenues	$ 79,656
Net income attributable to common stockholders of Columbia Property Trust	$ 5,736

Transactions (Schedule of Prope

Transactions (Schedule of Properties Acquired) (Details) - USD ($) $ in Thousands	Mar. 13, 2020	Dec. 09, 2019	Dec. 02, 2019
Terminal Warehouse
Business Acquisition [Line Items]
Ownership Interest	8.65%
Purchase Price	$ 40,048
201 California Street
Business Acquisition [Line Items]
Ownership Interest		100.00%
Purchase Price		$ 238,900
101 Franklin Street
Business Acquisition [Line Items]
Ownership Interest			92.50%
Purchase Price			$ 205,500

Transactions (Dispositions) (De

Transactions (Dispositions) (Details) - Disposed of by Sale - USD ($) $ in Thousands	Mar. 31, 2020	Jan. 19, 2020	Jan. 16, 2020	Sep. 26, 2019	Apr. 15, 2019
Pasadena Corporate Park
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
% Sold	100.00%
Sales Price	$ 78,000
Gain (loss) on sale	$ (83)
Cranberry Woods Drive
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
% Sold			100.00%
Sales Price		$ 180,000	$ 180,000
Gain (loss) on sale		$ 13,400	$ 13,428
Lindbergh Center
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
% Sold				100.00%
Sales Price				$ 187,000
Gain (loss) on sale				$ 0
One & Three Glenlake Parkway
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
% Sold					100.00%
Sales Price					$ 227,500
Gain (loss) on sale					$ 42,030

Transactions (Dispositions Narr

Transactions (Dispositions Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Jan. 19, 2020	Jan. 16, 2020	Sep. 26, 2019	Apr. 15, 2019	Dec. 31, 2019	Sep. 30, 2019
Credit Facilities | Revolving Credit Facility
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Repayment of debt							$ 46,000
Disposed of by Sale | Pasadena Corporate Park
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration transferred	$ 78,000
Gain (loss) on sale	$ (83)
Impairment loss on real estate assets						$ 20,600
Disposed of by Sale | Cranberry Woods Drive
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration transferred		$ 180,000	$ 180,000
Gain (loss) on sale		$ 13,400	$ 13,428
Disposed of by Sale | Lindbergh Center
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration transferred				$ 187,000
Gain (loss) on sale				$ 0
Impairment loss on real estate assets							$ 23,400
Disposed of by Sale | One & Three Glenlake Parkway
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration transferred					$ 227,500
Gain (loss) on sale					42,030
Adjustments for tenant improvements and rent abatements					$ 33,600

Unconsolidated Joint Ventures_2

Unconsolidated Joint Ventures (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020USD ($)joint_venture	Mar. 31, 2019USD ($)	Dec. 31, 2019USD ($)
Schedule of Equity Method Investments [Line Items]
Interest capitalized	$ 3,000
Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Carrying Value of Investment	$ 1,087,694		$ 1,054,460
Corporate Joint Venture | Unconsolidated Properties | L&L Normandy Terminal Asset Manager, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	67.00%
Corporate Joint Venture | Unconsolidated Properties | L&L Normandy Terminal Development Manager, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	50.00%
Corporate Joint Venture | Unconsolidated Properties | L&L Normandy Terminal Property Manager
Schedule of Equity Method Investments [Line Items]
Ownership Interest	50.00%
Corporate Joint Venture | Unconsolidated Properties | WNK Maiden Management
Schedule of Equity Method Investments [Line Items]
Ownership Interest	50.00%
Corporate Joint Venture | Unconsolidated Properties | Maple AB Services, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	55.00%
Corporate Joint Venture | Market Square Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership Interest	51.00%
Carrying Value of Investment	$ 136,481		135,557
Corporate Joint Venture | University Circle Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership Interest	55.00%
Carrying Value of Investment	$ 281,457		283,633
Corporate Joint Venture | 333 Market Street Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership Interest	55.00%
Carrying Value of Investment	$ 268,438		269,638
Corporate Joint Venture | 114 Fifth Avenue Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership Interest	49.50%
Carrying Value of Investment	$ 83,726		87,750
Corporate Joint Venture | 1800 M Street Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership Interest	55.00%
Carrying Value of Investment	$ 230,570		233,196
Corporate Joint Venture | 799 Broadway Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership Interest	49.70%
Carrying Value of Investment	$ 46,620		44,686
Interest capitalized	$ 400	$ 300
Corporate Joint Venture | Terminal Warehouse Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership Interest	8.65%
Carrying Value of Investment	$ 39,724		0
Corporate Joint Venture | Market Square, University Circle, 333 Market Street, 114 Fifth Avenue, 1800 M Street, 799 Broadway Joint Ventures And Terminal Warehouse
Schedule of Equity Method Investments [Line Items]
Aggregate basis difference	288,900		279,200
Corporate Joint Venture | Real Estate Services Joint Ventures
Schedule of Equity Method Investments [Line Items]
Carrying Value of Investment	$ 678		$ 0
Corporate Joint Venture | Real Estate Services Joint Ventures | Unconsolidated Properties
Schedule of Equity Method Investments [Line Items]
Number of unconsolidated joint ventures | joint_venture	5

Unconsolidated Joint Ventures_3

Unconsolidated Joint Ventures (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020USD ($)joint_venture	Mar. 31, 2019USD ($)	Dec. 31, 2019USD ($)
Related Party Transaction [Line Items]
Number of joint ventures that qualify as variable interest entities | joint_venture	0
Property operating costs
Related Party Transaction [Line Items]
Reimbursements of property operating costs	$ 8,240	$ 1,869
Property operating costs | Other property income
Related Party Transaction [Line Items]
Reimbursements of property operating costs	1,300	$ 1,200
Prepaid expenses and other assets
Related Party Transaction [Line Items]
Property management fee receivable			$ 600
Prepaid expenses and other assets | Corporate Joint Venture
Related Party Transaction [Line Items]
Property management fee receivable	$ 300

Unconsolidated Joint Ventures_4

Unconsolidated Joint Ventures (Condensed Balance Sheet Information for Joint Ventures) (Details)	Oct. 03, 2018USD ($)extension	Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Schedule of Equity Method Investments [Line Items]
Deferred financing costs, net		$ 1,930,000	$ 2,084,000
Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Total Assets		3,333,260,000	2,291,036,000
Total Debt		1,062,750,000	434,550,000
Total Equity		1,769,654,000	1,441,218,000
Corporate Joint Venture | Blackstone Property Partners
Schedule of Equity Method Investments [Line Items]
Debt		$ 325,000,000
Mortgage note interest rate		5.07%
Corporate Joint Venture | 799 Broadway Joint Venture
Schedule of Equity Method Investments [Line Items]
Amount borrowed under construction loan		$ 122,100,000
Deferred financing costs, net		$ 3,000,000
LIBOR (maximum)	4.00%
Extension term		1 year
Corporate Joint Venture | 799 Broadway Joint Venture | Construction loan
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity	$ 187,000,000
Number of extensions available | extension	2
Corporate Joint Venture | 799 Broadway Joint Venture | LIBOR
Schedule of Equity Method Investments [Line Items]
Basis spread	4.25%
Corporate Joint Venture | Terminal Warehouse
Schedule of Equity Method Investments [Line Items]
Amount borrowed under construction loan		$ 625,500,000
Deferred financing costs, net		$ 6,700,000
Extension term		1 year
Corporate Joint Venture | Terminal Warehouse | Construction loan
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity	$ 650,000,000
Corporate Joint Venture | Terminal Warehouse | LIBOR
Schedule of Equity Method Investments [Line Items]
Basis spread	3.40%
Corporate Joint Venture | Market Square Joint Venture
Schedule of Equity Method Investments [Line Items]
Total Assets		$ 579,363,000	582,747,000
Total Debt		324,828,000	324,815,000
Total Equity		242,942,000	241,719,000
Corporate Joint Venture | University Circle Joint Venture
Schedule of Equity Method Investments [Line Items]
Total Assets		217,185,000	216,546,000
Total Debt		0	0
Total Equity		211,218,000	212,656,000
Corporate Joint Venture | 333 Market Street Joint Venture
Schedule of Equity Method Investments [Line Items]
Total Assets		364,893,000	367,652,000
Total Debt		0	0
Total Equity		349,936,000	352,385,000
Corporate Joint Venture | 114 Fifth Avenue Joint Venture
Schedule of Equity Method Investments [Line Items]
Total Assets		476,785,000	485,442,000
Total Debt		0	0
Total Equity		119,831,000	127,554,000
Corporate Joint Venture | 1800 M Street Joint Venture
Schedule of Equity Method Investments [Line Items]
Total Assets		429,767,000	437,439,000
Total Debt		0	0
Total Equity		416,836,000	421,588,000
Corporate Joint Venture | 799 Broadway Joint Venture
Schedule of Equity Method Investments [Line Items]
Total Assets		220,024,000	201,210,000
Total Debt		119,156,000	109,735,000
Total Equity		88,374,000	85,316,000
Corporate Joint Venture | Terminal Warehouse
Schedule of Equity Method Investments [Line Items]
Total Assets		1,042,748,000	0
Total Debt		618,766,000	0
Total Equity		339,319,000	0
Corporate Joint Venture | Real Estate Services Joint Ventures
Schedule of Equity Method Investments [Line Items]
Total Assets		2,495,000	0
Total Debt		0	0
Total Equity		$ 1,198,000	$ 0

Unconsolidated Joint Ventures_5

Unconsolidated Joint Ventures (Condensed Income Statement Information for the Joint Ventures) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Schedule of Equity Method Investments [Line Items]
Columbia Property Trust's Share of Net Income (Loss)	$ 2,656	$ 1,771
Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Total Revenues	55,228	50,036
Net Income (Loss)	3,690	4,838
Columbia Property Trust's Share of Net Income (Loss)	3,815	2,931
Corporate Joint Venture | Market Square Joint Venture
Schedule of Equity Method Investments [Line Items]
Total Revenues	12,690	11,337
Net Income (Loss)	(1,994)	(2,595)
Columbia Property Trust's Share of Net Income (Loss)	(1,017)	(1,323)
Corporate Joint Venture | University Circle Joint Venture
Schedule of Equity Method Investments [Line Items]
Total Revenues	10,924	11,272
Net Income (Loss)	5,715	6,364
Columbia Property Trust's Share of Net Income (Loss)	3,144	3,500
Corporate Joint Venture | 333 Market Street Joint Venture
Schedule of Equity Method Investments [Line Items]
Total Revenues	7,067	7,054
Net Income (Loss)	3,705	3,713
Columbia Property Trust's Share of Net Income (Loss)	2,037	2,042
Corporate Joint Venture | 114 Fifth Avenue Joint Venture
Schedule of Equity Method Investments [Line Items]
Total Revenues	10,428	10,919
Net Income (Loss)	(2,653)	(2,506)
Columbia Property Trust's Share of Net Income (Loss)	(1,314)	(1,240)
Corporate Joint Venture | 1800 M Street Joint Venture
Schedule of Equity Method Investments [Line Items]
Total Revenues	9,937	9,454
Net Income (Loss)	1,752	388
Columbia Property Trust's Share of Net Income (Loss)	964	214
Corporate Joint Venture | 799 Broadway Joint Venture
Schedule of Equity Method Investments [Line Items]
Total Revenues	0	0
Net Income (Loss)	(32)	(526)
Columbia Property Trust's Share of Net Income (Loss)	(16)	(262)
Corporate Joint Venture | Terminal Warehouse
Schedule of Equity Method Investments [Line Items]
Total Revenues	2,307	0
Net Income (Loss)	(3,741)	0
Columbia Property Trust's Share of Net Income (Loss)	(324)	0
Corporate Joint Venture | Real Estate Services Joint Ventures
Schedule of Equity Method Investments [Line Items]
Total Revenues	1,875	0
Net Income (Loss)	938	0
Columbia Property Trust's Share of Net Income (Loss)	$ 341	$ 0

Unconsolidated Joint Ventures_6

Unconsolidated Joint Ventures (Management Fees) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Schedule of Equity Method Investments [Line Items]
Asset and property management fees	$ 4,300	$ 1,900
Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Asset and property management fees	2,153	1,869
Market Square Joint Venture | Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Asset and property management fees	574	568
University Circle Joint Venture | Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Asset and property management fees	587	574
333 Market Street Joint Venture | Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Asset and property management fees	214	207
1800 M Street Joint Venture | Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Asset and property management fees	555	520
799 Broadway Joint Venture | Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Asset and property management fees	$ 223	$ 0

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, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Loan payable	$ 949,070,000	$ 781,916,000
Less: Deferred financing costs related to term loans and notes payable, net of accumulated amortization	(1,930,000)	(2,084,000)
Credit Facilities | Revolving Credit Facility
Debt Instrument [Line Items]
Loan payable	501,000,000	334,000,000
Term Loans
Debt Instrument [Line Items]
Less: Deferred financing costs related to term loans and notes payable, net of accumulated amortization	(1,930,000)	(2,084,000)
Term Loans | $300 Million Term Loan
Debt Instrument [Line Items]
Loan payable	300,000,000	300,000,000
Face amount of issued debt instrument	300,000,000	300,000,000
Term Loans | $150 Million Term Loan
Debt Instrument [Line Items]
Loan payable	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)	3 Months Ended
	Mar. 31, 2020USD ($)extension	Mar. 31, 2019USD ($)	Dec. 31, 2019USD ($)
Debt Instrument [Line Items]
Loan payable	$ 949,070,000		$ 781,916,000
Interest payments	5,000,000	$ 5,600,000
Interest capitalized	3,000,000
Capitalized interest costs	$ 2,600,000	900,000
Weighted average interest rate	3.26%
Corporate Joint Venture
Debt Instrument [Line Items]
Capitalized interest costs	$ 400,000	300,000
Credit Facilities
Debt Instrument [Line Items]
Term of extension	1 year
Credit Facilities | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 650,000,000
Number of possible extensions | extension	2
Term of extension	6 months
Loan payable	$ 501,000,000		334,000,000
Credit Facilities | Revolving Credit Facility | Minimum | Base Rate
Debt Instrument [Line Items]
Basis spread	0.00%
Credit Facilities | Revolving Credit Facility | Minimum | LIBOR
Debt Instrument [Line Items]
Basis spread	0.775%
Credit Facilities | Revolving Credit Facility | Maximum | Base Rate
Debt Instrument [Line Items]
Basis spread	0.45%
Credit Facilities | Revolving Credit Facility | Maximum | LIBOR
Debt Instrument [Line Items]
Basis spread	1.45%
Term Loans | $300 Million Term Loan
Debt Instrument [Line Items]
Face amount of issued debt instrument	$ 300,000,000		300,000,000
Loan payable	$ 300,000,000		300,000,000
Term Loans | $300 Million Term Loan | Interest Rate Swap
Debt Instrument [Line Items]
Effective interest rate	2.55%
Term Loans | $300 Million Term Loan | Minimum | Base Rate
Debt Instrument [Line Items]
Basis spread	0.00%
Term Loans | $300 Million Term Loan | Minimum | LIBOR
Debt Instrument [Line Items]
Basis spread	0.85%
Term Loans | $300 Million Term Loan | Maximum | Base Rate
Debt Instrument [Line Items]
Basis spread	0.65%
Term Loans | $300 Million Term Loan | Maximum | LIBOR
Debt Instrument [Line Items]
Basis spread	1.65%
Term Loans | $150 Million Term Loan
Debt Instrument [Line Items]
Face amount of issued debt instrument	$ 150,000,000		150,000,000
Loan payable	$ 150,000,000		150,000,000
Term Loans | $150 Million Term Loan | Interest Rate Swap
Debt Instrument [Line Items]
Effective interest rate	3.07%
Term Loans | $150 Million Term Loan | Minimum | Base Rate
Debt Instrument [Line Items]
Basis spread	0.00%
Term Loans | $150 Million Term Loan | Minimum | LIBOR
Debt Instrument [Line Items]
Basis spread	0.90%
Term Loans | $150 Million Term Loan | Maximum | Base Rate
Debt Instrument [Line Items]
Basis spread	0.75%
Term Loans | $150 Million Term Loan | Maximum | LIBOR
Debt Instrument [Line Items]
Basis spread	1.75%
Loans Payable
Debt Instrument [Line Items]
Estimated fair value of line of credit and notes payable	$ 935,800,000		784,100,000
Carrying value of the line of credit and notes payable	$ 951,000,000		$ 784,000,000
Interest capitalized		1,200,000
Capitalized interest costs		$ 900,000

Bonds Payable (Details)

Bonds Payable (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2020USD ($)bond	Mar. 31, 2019USD ($)	Dec. 31, 2019USD ($)bond
Debt Instrument [Line Items]
Number of series of bonds | bond	2		2
Interest payments	$ 5,000,000	$ 5,600,000
Carrying value, net of discounts	695,519,000		$ 695,324,000
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	735,700,000		734,400,000
Carrying value, net of discounts	698,900,000		698,900,000
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)	1 Months Ended	3 Months Ended
	Jan. 31, 2020USD ($)	Mar. 31, 2020USD ($)property
Loss Contingencies [Line Items]
Unfunded capital contributions		$ 4,600,000
Corporate Joint Venture | 799 Broadway Joint Venture
Loss Contingencies [Line Items]
Construction loan guaranty		14,300,000
Capital calls unpaid		0
Guaranty liability		0
Corporate Joint Venture | 799 Broadway Joint Venture
Loss Contingencies [Line Items]
Amount borrowed under construction loan		122,100,000
Corporate Joint Venture | Columbia Property Trust and joint venturer | 799 Broadway Joint Venture
Loss Contingencies [Line Items]
Construction loan guaranty		$ 28,800,000
Office Building
Loss Contingencies [Line Items]
Number of real estate properties | property		15
Office Building | Corporate Joint Venture
Loss Contingencies [Line Items]
Number of real estate properties | property		8
149 Madison Avenue
Loss Contingencies [Line Items]
Unrecorded tenant commitments		$ 15,900,000
95 Columbus
Loss Contingencies [Line Items]
Unrecorded tenant commitments		$ 17,600,000
80 M Street | Capital Addition Purchase Commitments
Loss Contingencies [Line Items]
Purchase commitment	$ 65,300,000

Stockholders' Equity (Narrative

Stockholders' Equity (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 04, 2019
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	$ 18,300,000	$ 9,500,000
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	$ 143,300,000
Common Stock | 2019 Stock Repurchase Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate purchases (in shares)	1,200,000
Average price (in dollars per share)	$ 19.47
Aggregate purchases	$ 23,300,000
Time-based Stock Awards | Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)	294,725
Vesting period	4 years
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)	303,000
RSUs | Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)	351,730
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%
Preferred OP Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs recognition period (years)	4 years
Unvested unit awards	$ 22,100,000

Stockholders' Equity (Unvested

Stockholders' Equity (Unvested Activity Rollforward) (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2020$ / sharesshares
Weighted-Average, Grant-Date Fair Value Rollforward
Expected forfeiture rate	4.10%
Restricted Shares
Shares Rollforward
Unvested awards - beginning of period (shares)	374
Granted (shares)	295
Converted (shares)	33
Vested (shares)	(166)
Forfeited (shares)	0
Unvested awards - end of period (shares)	536
Weighted-Average, Grant-Date Fair Value Rollforward
Unvested awards - beginning of period (dollars per share) | $ / shares	$ 20.96
Granted (dollars per share) | $ / shares	21.06
Vested (dollars per share) | $ / shares	21.22
Forfeited (dollars per share) | $ / shares	0
Unvested awards - end of period (dollars per share) | $ / shares	$ 20.94
Performance period	3 years
Shares expected to ultimately vest	514
RSUs
Shares Rollforward
Unvested awards - beginning of period (shares)	584
Granted (shares)	303
Converted (shares)	(33)
Vested (shares)	(101)
Forfeited (shares)	(9)
Unvested awards - end of period (shares)	744
Weighted-Average, Grant-Date Fair Value Rollforward
Unvested awards - beginning of period (dollars per share) | $ / shares	$ 18.86
Granted (dollars per share) | $ / shares	18.06
Vested (dollars per share) | $ / shares	18.48
Forfeited (dollars per share) | $ / shares	20.49
Unvested awards - end of period (dollars per share) | $ / shares	$ 18.58
Shares expected to ultimately vest	713

Stockholders' Equity (Director

Stockholders' Equity (Director Stock Grants) (Details) - Director - May 14, 2019	May 14, 2019$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted | shares	591
Grant-Date Fair Value (dollars per share) | $ / shares	$ 19.80

Stockholders' Equity (Stock-bas

Stockholders' Equity (Stock-based Compensation Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Noncash compensation expense	$ 4,657	$ 1,539
Amortization of Preferred OP unit awards issued in connection with the Normandy Acquisition	2,358	0
Future employee awards	1,031	655
Total stock-based compensation expense	4,348	1,539
Employees
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Noncash compensation expense	947	884
Director
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Noncash compensation expense	$ 12	$ 0

Noncontrolling Interests (Detai

Noncontrolling Interests (Details) $ / shares in Units, ft² in Thousands, $ in Thousands	Jan. 24, 2020property$ / sharesshares	Mar. 31, 2020USD ($)ft²	Dec. 31, 2019USD ($)
Noncontrolling Interest [Line Items]
Total assets		$ 4,400,991	$ 4,244,945
Total liabilities		$ 1,776,604	$ 1,616,328
Square feet of real estate | ft²		6,300
Columbia Operating Partnership
Noncontrolling Interest [Line Items]
Total assets		$ 4,300,000
Total liabilities		1,900,000
101 Franklin Street
Noncontrolling Interest [Line Items]
Total assets		5,100
Total liabilities		$ 3,000
Square feet of real estate | ft²		235
Preferred OP Units
Noncontrolling Interest [Line Items]
Vesting period	4 years
Conversion rate of Preferred OP Units | property	1
Normandy Acquisition | Preferred OP Units
Noncontrolling Interest [Line Items]
Number of shares to be issued for acquisition (in shares) | shares	3,264,151
Liquidation preference (in dollars per share) | $ / shares	$ 26.50
Vesting period	4 years
Variable Interest Entity, Primary Beneficiary | Columbia Operating Partnership
Noncontrolling Interest [Line Items]
Variable interest entity percentage		97.20%
Variable Interest Entity, Primary Beneficiary | 101 Franklin Street
Noncontrolling Interest [Line Items]
Variable interest entity percentage		92.50%

Supplemental Disclosures of N_3

Supplemental Disclosures of Noncash Investing and Financing Activities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Supplemental Cash Flow Elements [Abstract]
Other assets assumed at acquisition	$ 245	$ 0
Operating lease liability assumed at acquisition	961	34,791
Other liabilities assumed at acquisition	245	0
Amortization of net discounts on debt	45	45
Accrued investments in unconsolidated joint ventures	0	88
Accrued capital expenditures and deferred lease costs	15,447	19,603
Market value adjustments to interest rate swaps that qualify for hedge accounting treatment	(19,993)	(1,431)
Issuance of Preferred OP Units for the Normandy Acquisition (Note 3)	55,306	0
Stock-based compensation expense	$ 4,348	$ 1,539

Leases - Narrative (Details)

Leases - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020USD ($)ground_lease	Dec. 31, 2019USD ($)
Lessee, Lease, Description [Line Items]
Operating lease, number of ground leases | ground_lease	1
Operating lease assets	$ 30,090	$ 29,470
Operating lease liabilities	$ 2,887	$ 2,186
Lessor, operating lease, weighted-average remaining lease term	6 years 4 months 24 days
Minimum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, right-of-use asset, term of contract	57 years 9 months 18 days
Maximum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, liability, term of contract	2 years 6 months

Leases - Fixed and Variable Rev

Leases - Fixed and Variable Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Fixed payments	$ 61,243	$ 65,517
Variable payments	6,764	6,345
Total lease revenues	$ 68,007	$ 71,862

Non-Lease Revenues (Details)

Non-Lease Revenues (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Asset and property management fee income	$ 4,300,000	$ 1,900,000
Leasing override fee income	14,600	3,000
Construction and development fees	800,000
Salary and other reimbursement revenue	3,100,000	1,100,000
Miscellaneous revenue	$ 7,100	$ 176,500

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, 2020	Mar. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 6,290	$ 3,513
Distributions paid on unvested shares	(113)	(77)
Net income attributable to common stockholders used to calculate basic and diluted earnings per share	$ 6,177	$ 3,436
Weighted-average common shares – basic	114,471	116,462
Weighted-average common shares – diluted	114,486	116,880
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	15	90
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	0	328

Segment Information (Operating

Segment Information (Operating Revenues by Geographic Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 13, 2020
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	$ 97,287	$ 102,109
Operating revenues	76,254	75,433
Asset and property management fee income	(4,300)	(1,900)
Operating Segments
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	97,660	101,323
Operating Segments | New York
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	41,105	38,696
Operating Segments | San Francisco
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	34,801	27,763
Operating Segments | Washington, D.C.
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	15,018	14,130
Operating Segments | Boston
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	4,149	3,674
Operating Segments | All other office markets
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	2,587	17,060
Corporate
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	(373)	786
Eliminations
Segment Reporting Information [Line Items]
Operating revenues	29,273	28,545
Asset and property management fee income	(8,240)	(1,869)
Corporate Joint Venture
Segment Reporting Information [Line Items]
Asset and property management fee income	$ (2,153)	(1,869)
Corporate Joint Venture | Terminal Warehouse
Segment Reporting Information [Line Items]
Economic interest	8.65%		8.65%
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%
Market Square Joint Venture | Corporate Joint Venture
Segment Reporting Information [Line Items]
Ownership percentage	51.00%
Asset and property management fee income	$ (574)	(568)
1800 M Street Joint Venture | Corporate Joint Venture
Segment Reporting Information [Line Items]
Ownership percentage	55.00%
Asset and property management fee income	$ (555)	$ (520)

Segment Information (Net Operat

Segment Information (Net Operating Income By Geographic Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 13, 2020
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	$ 63,009	$ 66,646
Operating Segments
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	63,281	66,851
Operating Segments | New York
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	25,075	22,806
Operating Segments | San Francisco
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	25,072	20,497
Operating Segments | Washington, D.C.
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	9,151	8,453
Operating Segments | Boston
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	2,458	1,989
Operating Segments | All other office markets
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	1,525	13,106
Corporate
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	$ (272)	$ (205)
Corporate Joint Venture | Terminal Warehouse
Segment Reporting Information [Line Items]
Economic interest	8.65%		8.65%
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%
333 Market Street and University Circle | Corporate Joint Venture
Segment Reporting Information [Line Items]
Ownership percentage	55.00%
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, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Net income	$ 6,290	$ 3,513
Asset and property management fee income	(4,300)	(1,900)
Depreciation	18,330	20,404
General and administrative – corporate	11,782	8,424
Management fee expense	6,945	0
General and administrative – joint ventures	0	809
Acquisition costs	12,081	0
Income tax expense	(2,243)	7
Gain on sale of real estate assets	(13,344)	0
Adjustments attributable to noncontrolling interests	71	0
NOI	63,009	66,646
Segment Reconciling Items
Segment Reporting Information [Line Items]
Asset and property management fee income	(8,240)	(1,869)
Depreciation	18,330	20,404
Amortization	6,721	7,461
General and administrative – corporate	11,782	8,424
Management fee expense	6,945	0
General and administrative – joint ventures	0	809
Acquisition costs	12,081	0
Net interest expense	9,713	12,094
Income tax expense	(2,243)	7
Adjustments included in income from unconsolidated joint ventures	14,903	15,803
Gain on sale of real estate assets	(13,344)	0
Adjustments attributable to noncontrolling interests	$ 71	$ 0