Columbia Property Trust (CXP) 10-Q 26 Apr 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	Apr. 20, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	COLUMBIA PROPERTY TRUST, INC.
Entity Central Index Key	1,252,849
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		118,601,872

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Real estate assets, at cost:
Land	$ 825,208	$ 825,208
Buildings and improvements, less accumulated depreciation of $407,894 and $388,796, as of March 31, 2018 and December 31, 2017, respectively	2,059,738	2,063,419
Intangible lease assets, less accumulated amortization of $99,092 and $94,065, as of March 31, 2018 and December 31, 2017, respectively	194,233	199,260
Construction in progress	46,814	44,742
Total real estate assets	3,125,993	3,132,629
Investments in unconsolidated joint ventures	1,058,441	943,242
Cash and cash equivalents	21,068	9,567
Tenant receivables, net of allowance for doubtful accounts of $0 as of March 31, 2018 and December 31, 2017	2,435	2,128
Straight-line rent receivable	102,415	92,235
Prepaid expenses and other assets	25,189	27,683
Intangible lease origination costs, less accumulated amortization of $59,884 and $57,465, as of March 31, 2018 and December 31, 2017, respectively	40,540	42,959
Deferred lease costs, less accumulated amortization of $28,562 and $26,464, as of March 31, 2018 and December 31, 2017, respectively	142,719	141,096
Investment in development authority bonds	120,000	120,000
Total assets	4,638,800	4,511,539
Liabilities:
Line of credit and notes payable, net of unamortized deferred financing costs of $2,641 and $2,991, as of March 31, 2018 and December 31, 2017, respectively	832,722	971,185
Bonds payable, net of discounts of $1,439 and $1,484 and unamortized deferred financing costs of $4,607 and $4,760, as of March 31, 2018 and December 31, 2017, respectively	693,954	693,756
Accounts payable, accrued expenses, and accrued capital expenditures	105,772	125,002
Dividends payable	0	23,961
Deferred income	18,264	18,481
Intangible lease liabilities, less accumulated amortization of $19,265 and $19,660, as of March 31, 2018 and December 31, 2017, respectively	25,629	27,218
Obligations under capital lease	120,000	120,000
Total liabilities	1,796,341	1,979,603
Commitments and Contingencies (Note 7)
Equity:
Common stock, $0.01 par value, 225,000,000 shares authorized, 118,601,872 and 119,789,106 shares issued and outstanding, as of March 31, 2018 and December 31, 2017, respectively	1,186	1,198
Additional paid-in capital	4,459,354	4,487,071
Cumulative distributions in excess of earnings	(1,621,498)	(1,957,236)
Cumulative other comprehensive loss	3,417	903
Total equity	2,842,459	2,531,936
Total liabilities and equity	$ 4,638,800	$ 4,511,539

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Building and improvements, accumulated depreciation	$ 407,894	$ 388,796
Intangible lease assets, accumulated amortization	99,092	94,065
Allowance for doubtful accounts	0	0
Intangible lease origination costs, accumulated amortization	59,884	57,465
Deferred lease costs, accumulated amortization	28,562	26,464
Deferred financing costs, net	2,641	2,991
Bonds payable discount	1,439	1,484
Intangible lease liabilities, accumulated amortization	$ 19,265	$ 19,660
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	118,601,872	119,789,106
Common stock, shares outstanding	118,601,872	119,789,106
Term Loans
Deferred financing costs, net	$ 2,641	$ 2,991
Bonds Payable
Deferred financing costs, net	$ 4,607	$ 4,760

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues:
Rental income	$ 64,817	$ 71,173
Tenant reimbursements	5,543	8,584
Hotel income	0	1,339
Asset and property management fee income	1,759	474
Other property income	1,591	586
Revenues	73,710	82,156
Expenses:
Property operating costs	23,062	24,105
Hotel operating costs	0	2,076
Asset and property management fee expenses	208	269
Depreciation	20,835	21,605
Amortization	8,016	9,457
General and administrative – corporate	7,794	8,768
General and administrative – unconsolidated joint ventures	731	0
Costs and expenses	60,646	66,280
Real estate operating income	13,064	15,876
Other Income (Expense):
Interest expense	(15,895)	(15,115)
Interest and other income	1,803	2,350
Gain on sale of unconsolidated joint venture interests	762	0
Loss on early extinguishment of debt	0	(45)
Nonoperating income (expense)	(13,330)	(12,810)
Income (loss) before income taxes, unconsolidated joint ventures, and sales of real estate	(266)	3,066
Income tax benefit (expense)	(7)	388
Income (loss) from unconsolidated joint ventures	1,771	(1,885)
Income before sales of real estate	1,498	1,569
Gains on sales of real estate assets	0	73,153
Net income	$ 1,498	$ 74,722
Per-Share Information – Basic:
Net income (dollars per share)	$ 0.01	$ 0.61
Weighted-average common shares outstanding – basic	119,082	122,003
Per-Share Information – Diluted:
Net income (dollars per share)	$ 0.01	$ 0.61
Weighted-average common shares outstanding – diluted	119,350	122,329
Dividends per share (dollars per share)	$ 0.2	$ 0.2

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 1,498	$ 74,722
Market value adjustment to interest rate swap	2,514	634
Comprehensive income	$ 4,012	$ 75,356

Consolidated Statements of Equi

Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Cumulative Distributions in Excess of Earnings	Cumulative Other Comprehensive Income
Beginning balance, shares at Dec. 31, 2016		122,184,000
Beginning balance, value at Dec. 31, 2016	$ 2,502,768	$ 1,221	$ 4,538,912	$ (2,036,482)	$ (883)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued to employees and directors, and amortized (net of income tax withholdings), shares		267,000
Common stock issued to employees and directors, and amortized (net of income tax withholdings)	235	$ 3	232
Distributions to common stockholders ($0.20 in 2018 and $0.20 in 2017)	(24,490)			(24,490)
Net income	74,722			74,722
Market value adjustment to interest rate swap	634				634
Ending balance, shares at Mar. 31, 2017		122,451,000
Ending balance, value at Mar. 31, 2017	2,553,869	$ 1,224	4,539,144	(1,986,250)	(249)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative-effect adjustment for the adoption of ASU | ASU 2017-05	$ 0
Beginning balance, shares at Dec. 31, 2017	119,789,106	119,789,000
Beginning balance, value at Dec. 31, 2017	$ 2,531,936	$ 1,198	4,487,071	(1,957,236)	903
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchases of common stock, shares		(1,295,000)
Repurchases of common stock	(27,286)	$ (13)	(27,273)
Common stock issued to employees and directors, and amortized (net of income tax withholdings), shares		108,000
Common stock issued to employees and directors, and amortized (net of income tax withholdings)	(443)	$ 1	(444)
Distributions to common stockholders ($0.20 in 2018 and $0.20 in 2017)	(23,858)			(23,858)
Net income	1,498			1,498
Market value adjustment to interest rate swap	$ 2,514				2,514
Ending balance, shares at Mar. 31, 2018	118,601,872	118,602,000
Ending balance, value at Mar. 31, 2018	$ 2,842,459	$ 1,186	$ 4,459,354	(1,621,498)	$ 3,417
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative-effect adjustment for the adoption of ASU | ASU 2017-05	357,755			357,755
Cumulative-effect adjustment for the adoption of ASU | ASU 2014-09	$ 343			$ 343

Consolidated Statements of Equ7

Consolidated Statements of Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Distributions to common stockholders per share (dollars per share)	$ 0.2	$ 0.2
Common Stock
Distributions to common stockholders per share (dollars per share)	$ 0.2	$ 0.20

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash Flows From Operating Activities:
Net income	$ 1,498	$ 74,722
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Straight-line rental income	(9,698)	(6,376)
Depreciation	20,835	21,605
Amortization	7,955	8,869
Noncash interest expense	882	772
Loss on early extinguishment of debt	0	45
Income (loss) from unconsolidated joint ventures	(1,771)	1,885
Distributions of earnings from unconsolidated joint ventures	8,573	0
Gain on sale of unconsolidated joint venture interests	(762)	0
Gain on sales of real estate assets	0	(73,153)
Stock-based compensation expense	1,528	1,691
Changes in assets and liabilities, net of acquisitions and dispositions:
Decrease (increase) in tenant receivables, net	(829)	2,611
Decrease (increase) in prepaid expenses and other assets	4,962	(1,576)
Decrease in accounts payable and accrued expenses	(18,185)	(21,118)
Decrease in deferred income	(217)	(4,579)
Net cash provided by operating activities	14,771	5,398
Cash Flows From Investing Activities:
Net proceeds from the sales of real estate	0	504,660
Net proceeds from sale of investments in unconsolidated joint ventures	235,083	0
Prepaid earnest money	0	(12,000)
Capital improvement and development costs	(19,363)	(17,268)
Deferred lease costs paid	(4,514)	(3,906)
Investments in unconsolidated joint ventures	(1,541)	(1,230)
Distributions from unconsolidated joint ventures	2,976	0
Net cash provided by investing activities	212,641	470,256
Cash Flows From Financing Activities:
Financing costs paid	(17)	0
Proceeds from lines of credit and notes payable	109,000	0
Repayments of lines of credit and notes payable	(247,814)	(74,406)
Distributions paid to stockholders	(47,819)	(61,217)
Redemptions of common stock	(29,261)	(1,461)
Net cash used in financing activities	(215,911)	(137,084)
Net increase (decrease) in cash and cash equivalents	11,501	338,570
Cash and cash equivalents, beginning of period	9,567	216,085
Cash and cash equivalents, end of period	$ 21,068	$ 554,655

Organization

Organization	3 Months Ended
	Mar. 31, 2018
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 was incorporated in 2003, commenced operations in 2004, and conducts business primarily through Columbia Property Trust Operating Partnership, L.P. ("Columbia Property Trust OP"), a Delaware limited partnership. Columbia Property Trust is the general partner and sole owner of Columbia Property Trust OP and possesses full legal control and authority over its operations. Columbia Property Trust OP acquires, redevelops, owns, leases, and operates real properties directly, through wholly owned subsidiaries, or through unconsolidated joint ventures. Unless otherwise noted herein, references to Columbia Property Trust, "we," "us," or "our" herein shall include Columbia Property Trust and all subsidiaries of Columbia Property Trust, direct and indirect. Columbia Property Trust typically invests in high-quality, income-generating office properties. As of March 31, 2018 , Columbia Property Trust owned 19 operating properties and one property under redevelopment, of which 15 were wholly owned and five were owned through unconsolidated joint ventures. The operating properties are located primarily in New York, San Francisco, Washington, D.C., and Atlanta, contain a total of 9.2 million rentable square feet, and were approximately 96.8% leased as of March 31, 2018 .

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2018
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 our unconsolidated joint ventures, which are accounted for using the equity method of accounting, see Note 4, Unconsolidated Joint Ventures . Columbia Property Trust's consolidated financial statements include the accounts of Columbia Property Trust, Columbia Property Trust OP, and any variable-interest entity in which Columbia Property Trust or Columbia Property Trust OP was deemed the primary beneficiary. With respect to entities that are not variable interest entities, Columbia Property Trust's consolidated financial statements also include the accounts of any entity in which Columbia Property Trust, Columbia Property Trust OP, or their subsidiaries own a controlling financial interest and any limited partnership in which Columbia Property Trust, Columbia Property Trust OP, or their subsidiaries own a controlling general partnership interest. All intercompany balances and transactions have been eliminated in consolidation. For further information, refer to the financial statements and footnotes included in Columbia Property Trust's Annual Report on Form 10-K for the year ended December 31, 2017 (the " 2017 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 40-45 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 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 three months. As of March 31, 2018 and December 31, 2017 , none of Columbia Property Trust's properties met the criteria to be classified as held for sale in the accompanying balance sheet. Evaluating the Recoverability of Real Estate Assets Columbia Property Trust continually monitors events and changes in circumstances that could indicate that the carrying amounts of its real estate and related intangible assets, of both operating properties and properties under redevelopment, may not be recoverable. When indicators of potential impairment are present that suggest that the carrying amounts of real estate assets and related intangible assets and liabilities may not be recoverable, Columbia Property Trust assesses the recoverability of these assets and liabilities by determining whether the respective carrying values will be recovered through the estimated undiscounted future cash flows expected from the use of the 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 value 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 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. Based on the assessment as described above, Columbia Property Trust has determined that the carrying values of all its real estate assets and related intangible assets are recoverable as of March 31, 2018 . 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. 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, 2018 and December 31, 2017 , Columbia Property Trust had the following intangible assets and liabilities, arising from in-place leases, excluding amounts held for sale (in thousands): Intangible Lease Assets Intangible Lease Origination Costs Intangible Below-Market In-Place Lease Liabilities Above-Market In-Place Lease Assets Absorption Period Costs March 31, 2018 Gross $ 2,481 $ 149,929 $ 100,424 $ 44,894 Accumulated Amortization (883 ) (74,805 ) (59,884 ) (19,265 ) Net $ 1,598 $ 75,124 $ 40,540 $ 25,629 December 31, 2017 Gross $ 2,481 $ 149,927 $ 100,424 $ 46,878 Accumulated Amortization (833 ) (70,465 ) (57,465 ) (19,660 ) Net $ 1,648 $ 79,462 $ 42,959 $ 27,218 For the three months ended March 31, 2018 and 2017 , Columbia Property Trust recognized the following amortization of intangible lease assets and liabilities (in thousands): Intangible Lease Assets Intangible Lease Origination Costs Intangible Below-Market In-Place Lease Liabilities Above-Market In-Place Lease Assets Absorption Period Costs For the Three Months Ended March 31, 2018 $ 51 $ 4,339 $ 2,419 $ 1,589 For the Three Months Ended March 31, 2017 $ 288 $ 5,068 $ 3,089 $ 2,405 The net intangible assets and liabilities remaining as of March 31, 2018 will be amortized as follows (in thousands): Intangible Lease Assets Intangible Lease Origination Costs Intangible Below-Market In-Place Lease Liabilities Above-Market In-Place Lease Assets Absorption Period Costs For the remainder of 2018 $ 153 $ 12,583 $ 7,152 $ 4,736 For the years ending December 31: 2019 203 14,665 8,651 5,968 2020 203 12,801 7,770 4,535 2021 203 8,112 3,727 1,591 2022 203 6,585 2,708 1,287 2023 203 5,944 2,480 1,264 Thereafter 430 14,434 8,052 6,248 $ 1,598 $ 75,124 $ 40,540 $ 25,629 Intangible Assets and Liabilities Arising From In-Place Leases Where Columbia Property Trust Is the Lessee Columbia Property Trust is the lessee on certain in-place ground leases. Intangible above-market and below-market in-place lease values are recorded as intangible lease liabilities and assets, respectively, and are amortized as an adjustment to property operating cost over the remaining term of the respective leases. Columbia Property Trust had gross below-market lease assets of approximately $140.9 million as of March 31, 2018 and December 31, 2017 , and recognized amortization of these assets of approximately $0.6 million for the three months ended March 31, 2018 and 2017 . As of March 31, 2018 , the remaining net below-market intangible lease assets will be amortized as follows (in thousands): For the remainder of 2018 $ 1,912 For the Years Ending December 31: 2019 2,549 2020 2,549 2021 2,549 2022 2,549 2023 2,549 Thereafter 102,854 $ 117,511 Interest Rate Swap Agreements Columbia Property Trust enters into interest rate swap contracts to mitigate its interest rate risk on the related financial instruments. Columbia Property Trust does not enter into derivative or interest rate swap transactions for speculative purposes; however, certain of its derivatives may not qualify for hedge accounting treatment. Columbia Property Trust records the fair value of its interest rate swaps on its consolidated balance sheet either as prepaid expenses and other assets or as accounts payable, accrued expenses, and accrued capital expenditures. Changes in the fair value of interest rate swaps that are designated as cash flow hedges are recorded as other comprehensive income. All changes in the fair value of interest rate swaps that do not qualify for hedge accounting treatment are recorded as gain or loss on interest rate swaps. Amounts received or paid under interest rate swap agreements are recorded as interest expense for contracts that qualify for hedge accounting treatment and as gain or loss on interest rate swaps for contracts that do not qualify for hedge accounting treatment. The following tables provide additional information related to Columbia Property Trust's interest rate swaps (in thousands): Estimated Fair Value as of Instrument Type Balance Sheet Classification March 31, December 31, Derivatives designated as hedging instruments: Interest rate contracts Prepaid expenses and other assets $ 3,417 $ 903 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 2018 2017 Market value adjustment to interest rate swaps designated as hedging instruments and included in other comprehensive income $ 2,514 $ 634 During the periods presented, there was no hedge ineffectiveness required to be recognized into earnings on the interest rate swaps that qualified for hedge accounting treatment. Income Taxes Columbia Property Trust has elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended (the "Code") and has operated as such beginning with its taxable year ended December 31, 2003. To qualify as a REIT, Columbia Property Trust must meet certain organizational and operational requirements, including a requirement to distribute at least 90% of its REIT taxable income, as defined by the Code, to its stockholders. As a REIT, Columbia Property Trust generally is not subject to income tax on income it distributes to stockholders. Columbia Property Trust's stockholder distributions typically exceed its taxable income due to the inclusion of noncash expenses, such as depreciation, in taxable income. As a result, Columbia Property Trust typically does not incur federal income taxes other than as described in the following paragraph. Columbia Property Trust is, however, subject to certain state and local taxes related to the operations of properties in certain locations, which have been provided for in the accompanying consolidated financial statements. Columbia Property Trust TRS, LLC, Columbia KCP TRS, LLC, and Columbia Energy TRS, LLC (collectively, the "TRS Entities") are wholly owned subsidiaries of Columbia Property Trust and are organized as Delaware limited liability companies. The TRS Entities, among other things, provide tenant services that Columbia Property Trust, as a REIT, cannot otherwise provide. Columbia Property Trust has elected to treat the TRS Entities as taxable REIT subsidiaries. Columbia Property Trust may perform certain additional, noncustomary services for tenants of its buildings through the TRS Entities; however, any earnings related to such services are subject to federal and state income taxes. In addition, for Columbia Property Trust to continue to qualify as a REIT, Columbia Property Trust must limit its investments in taxable REIT subsidiaries to 20% of the value of the total assets. The TRS Entities' deferred tax assets and liabilities represent temporary differences between the financial reporting basis and the tax basis of assets and liabilities based on the enacted rates expected to be in effect when the temporary differences reverse. If applicable, Columbia Property Trust records interest and penalties related to uncertain tax positions as general and administrative expense in the accompanying consolidated statements of operations. Reclassification Certain prior period amounts may be reclassified to conform to the current-period financial statement presentation. Within revenues on the accompanying consolidated statements of operations, management fees earned from unconsolidated joint ventures have been reclassified from other property income to a dedicated line item, asset and property management fee income, for all periods presented. Recent Accounting Pronouncements In February 2017, the FASB issued Accounting Standard Update 2017-05 , Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Non-Financial Assets ("ASU 2017-05"), which applies to the partial sale of non-financial assets, including real estate assets, to unconsolidated joint ventures. ASU 2017-05 requires Columbia Property Trust to measure its residual joint venture interest in properties transferred to unconsolidated joint ventures at fair value as of the transaction date by recognizing a gain or loss on 100% of the asset transferred (i.e. to fully step-up the basis of the residual investment in the joint venture). Columbia Property Trust adopted the new rule effective January 1, 2018 on a modified retrospective basis by recording a cumulative-effect adjustment to equity equal to the total gain on residual joint venture interests as of the transaction dates for the partial sales of Market Square, 333 Market Street, and University Circle, adjusted to reflect the impact of depreciating the additional step-ups through January 1, 2018. The adoption of this standard resulted in an increase to investments in unconsolidated joint ventures and equity of $357.8 million . In February 2016, the FASB issued Accounting Standards Update 2016-02 , Leases ("ASU 2016-02"), which amends the existing standards for lease accounting by requiring lessees to recognize most leases on their balance sheets and by making targeted changes to lessor accounting and reporting. The new standard will require lessees to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months, and classify such leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase of the leased asset by the lessee, or not. This classification will determine whether the lease expense is recognized based on an effective interest method (finance leases) or on a straight-line basis over the term of the lease (operating leases). Leases with a term of 12 months or less will be accounted for using an approach that is similar to existing guidance for operating leases today. The new standard requires lessors to account for leases, using an approach that is substantially equivalent to existing guidance as applies to sales-type leases, direct financing leases, and operating leases. ASU 2016-02 will be effective for Columbia Property Trust on January 1, 2019 and supersedes previous leasing standards. Upon implementing ASU 2016-02, Columbia Property Trust expects to record right of use assets and the related liabilities, for certain of its ground leases. Columbia Property Trust is in the process of evaluating the financial impact of this accounting change. In May 2014, the FASB issued Accounting Standards Update 2014-09, Revenue from Contracts with Customers ("ASU 2014-09"), which establishes a comprehensive model to account for revenues arising from contracts with customers. ASU 2014-09 applies to all contracts with customers, except those that are within the scope of other topics in the FASB's Accounting Standards Codification, such as real estate leases. ASU 2014-09 requires companies to perform a five-step analysis of transactions to determine when and how revenue is recognized. For Columbia Property Trust, the new standard applies primarily to fees earned from managing properties owned by its unconsolidated joint ventures and parking agreements with tenants. Given the structure of these agreements, the adoption of ASU 2014-09 has not materially impacted the timing or amount of Columbia Property Trust's revenues; however, Columbia Property Trust has included more extensive disclosures about its revenue streams and contracts with customers, which are presented in Note 11, Revenues . ASU 2014-09 was effective for Columbia Property Trust on January 1, 2018. Columbia Property Trust has applied the modified retrospective approach of adoption, which resulted in the recognition of a cumulative effect adjustment to equity of $0.3 million , with no retrospective adjustments to prior periods.

Real Estate Transactions

Real Estate Transactions	3 Months Ended
	Mar. 31, 2018
Real Estate [Abstract]
Real Estate Transactions	Real Estate Transactions Acquisitions Columbia Property Trust did not acquire any properties during the first three months of 2018 . During 2017 , Columbia Property Trust acquired the following properties and partial interests in properties: Property Location Date Percent Acquired Purchase Price (1) (in thousands) 2017 149 Madison Avenue New York, NY November 28, 2017 100.0 % $ 87,700 1800 M Street Washington, D.C. October 11, 2017 55.0 % $ 231,550 (2) 245-249 West 17th Street & 218 West 18th Street New York, NY October 11, 2017 100.0 % $ 514,100 114 Fifth Avenue New York, NY July 6, 2017 49.5 % $ 108,900 (2) (1) Exclusive of transaction costs and price adjustments. See purchase price allocation table below for a breakout of the net purchase price for wholly owned properties. (2) Purchase price is for our partial interests in the properties. These properties are owned through unconsolidated joint ventures. 149 Madison Avenue 149 Madison Avenue is a 12-story, 127,000 -square-foot office building, which was vacant at the time of acquisition. Columbia Property Trust acquired 149 Madison Avenue subject to a ground lease, which expired in January 2018. Columbia Property Trust is redeveloping this property. 1800 M Street Joint Venture Columbia Property Trust acquired a 55% interest in 1800 M Street through a newly created joint venture partnership with Allianz Real Estate of America ("Allianz"). 1800 M Street is a 10 -story, 581,000 -square-foot office building in Washington, D.C., which was 94% leased at acquisition (the “1800 M Street Joint Venture”). The total gross purchase price for 1800 M Street was $421.0 million . 245-249 West 17th Street & 218 West 18th Street 245-249 West 17th Street is made up of two interconnected 12- and six-story towers, totaling 281,000 square feet of office and retail space and 218 West 18th Street is a 12-story, 166,000 -square-foot office building. As of the acquisition date, 245-249 West 17th Street was 100% leased at acquisition to four tenants, including Twitter, Inc. ( 76% ) and Room & Board, Inc. ( 21% ); and, as of the acquisition date, 218 West 18th Street was 100% leased at acquisition to seven tenants, including Red Bull North America, Inc. ( 25% ), Company 3 ( 18% ), SY Partners ( 16% ), and SAE ( 16% ). 114 Fifth Avenue Joint Venture Columbia Property Trust acquired a 49.5% equity interest in a joint venture that owns the 114 Fifth Avenue property from Allianz (the "114 Fifth Avenue Joint Venture"). 114 Fifth Avenue is a 19 -story, 352,000 -square-foot building located in Manhattan’s Flatiron District that was 100% leased at acquisition, and is unencumbered by debt. The 114 Fifth Avenue Joint Venture is owned by Columbia Property Trust ( 49.5% ), Allianz ( 49.5% ), and L&L Holding Company ( 1.0% ). L&L Holding Company is the general partner and performs asset and property management services for the property. Purchase Price Allocations for Consolidated Property Acquisitions: 149 Madison Avenue 245-249 West 17th Street 218 West 18th Street Location New York, NY New York, NY New York, NY Date Acquired November 28, 2017 October 11, 2017 October 11, 2017 Purchase Price (in thousands): Land $ 59,112 $ 113,149 $ 43,836 Building and improvements 28,989 194,109 126,957 Intangible lease assets — 27,408 12,120 Intangible lease origination costs — 13,062 4,168 Intangible below market lease liability — (7,131 ) (11,757 ) Total purchase price $ 88,101 $ 340,597 $ 175,324 Note 2, Summary of Significant Accounting Policies , provides a discussion of the estimated useful life for each asset class. Pro Forma Financial Information The following unaudited pro forma statements of operations for the three months ended March 31, 2017 , have been prepared for Columbia Property Trust to give effect to the acquisitions of 245-249 West 17th Street, 218 West 18th Street, and 149 Madison Avenue as if the acquisitions had occurred on January 1, 2016. The following unaudited pro forma financial results for Columbia Property Trust have been prepared for informational purposes only and are not necessarily indicative of future results or of actual results that would have been achieved had these acquisitions been consummated as of January 1, 2016 (in thousands): Three Months Ended 2017 Revenues $ 91,784 Net income $ 77,049 Net income per share – basic $ 0.63 Net income per share – diluted $ 0.63 Dispositions During 2017 and the first three months of 2018, Columbia Property Trust sold the following properties or partial interests in properties of unconsolidated joint ventures: Property Location Date % Sold Sales Price (1) (in thousands) Gain on Sale (in thousands) 2018 University Circle & (2) San Francisco, CA February 1, 2018 22.5 % (2) $ 235,300 (2) $ 762 2017 University Circle & 333 Market Street (3) San Francisco, CA July 6, 2017 22.5 % (3) $ 234,000 (3) $ 102,400 Key Center Tower & Marriott (4) Cleveland, OH January 31, 2017 100.0 % $ 267,500 $ 9,500 Houston Properties (5) Houston, TX January 6, 2017 100.0 % $ 272,000 $ 63,700 (1) Exclusive of transaction costs and price adjustments. (2) Sale price is for the partial interests in the unconsolidated joint ventures that were sold. As previously agreed, Columbia Property Trust sold an additional 22.5% interest in the University Circle property and 333 Market Street building to its joint venture partner, Allianz, for $235.3 million (the "February 2018 Allianz Transaction"). The February 2018 Allianz Transaction resulted in a $0.8 million gain, which is presented as gain on sale of unconsolidated joint venture interests on the accompanying consolidated statements of operations. The gain is calculated as the sale price over the adjusted joint venture carrying value. In connection with implementing ASU 2017-05, effective January 1, 2018, the joint venture carrying value was increased to reflect its estimated fair value as of the joint venture formation date, July 6, 2017, less depreciation through January 1, 2018. For additional information, see footnote (3) below and Note 2, Summary of Significant Accounting Policies . The proceeds from this transaction were used to reduce the balance on the $300 Million Bridge Loan and the Revolving Credit Facility, as described in Note 5, Line of Credit and Notes Payable . (3) Sales price is for the partial interests in the properties that were sold. Columbia Property Trust contributed the 333 Market Street building and the University Circle property to joint ventures, and simultaneously sold a 22.5% interest in those joint ventures for $234.0 million to Allianz, an unrelated third party (collectively, the "San Francisco Joint Ventures"). (4) Key Center Tower & Marriott were sold in one transaction for $254.5 million of gross proceeds and a $13.0 million , 10 -year accruing note receivable from the principal of the buyer. As a result, Columbia Property Trust has applied the installment method to account for this transaction, and deferred $13.0 million of the total $22.5 million gain on sale. The Key Center Tower and Key Center Marriott generated a net loss of $1.9 million for the first 31 days of 2017, excluding the gain on sale. (5) 5 Houston Center, Energy Center I, and 515 Post Oak were sold in one transaction. These properties generated a net loss of $14.9 thousand for the first six days of 2017, excluding the gain on sale.

Unconsolidated Joint Ventures

Unconsolidated Joint Ventures	3 Months Ended
	Mar. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]
Unconsolidated Joint Ventures	Unconsolidated Joint Ventures As of March 31, 2018 and December 31, 2017 , Columbia Property Trust owned interests in the following properties through joint ventures, which are accounted for using the equity method of accounting: Carrying Value of Investment (1) Joint Venture Property Name Geographic Market Ownership Interest March 31, 2018 December 31, 2017 Market Square Joint Venture Market Square Washington, D.C. 51.0 % $ 134,609 $ 128,411 University Circle Joint Venture University Circle San Francisco 55.0 % (2) 298,852 173,798 333 Market Street Joint Venture 333 Market Street San Francisco 55.0 % (2) 276,869 288,236 114 Fifth Avenue Joint Venture 114 Fifth Avenue New York 49.5 % 106,937 110,311 1800 M Street Joint Venture 1800 M Street Washington, D.C. 55.0 % 241,174 242,486 $ 1,058,441 $ 943,242 (1) Includes basis differences. Columbia Property Trust adopted ASU 2017-05 effective January 1, 2018, which requires Columbia Property Trust to measure its residual joint venture interest in the properties transferred to unconsolidated joint ventures at fair value as of the transaction date (i.e., to fully step-up the basis of the residual investment in the joint venture). The new rule was adopted on a modified retrospective basis by recording a cumulative-effect adjustment to equity equal to the original gain or loss as of the respective transaction dates, adjusted to reflect the impact of depreciating the additional step-ups through January 1, 2018. The adoption of this standard resulted in an increase to investments in unconsolidated joint ventures and equity by $357.8 million on January 1, 2018, for the previous partial sales of interest in the Market Square, 333 Market Street, and University Circle properties. (2) On February 1, 2018, Allianz acquired from Columbia Property Trust an additional 22.5% interest in each of the University Circle Joint Venture and the 333 Market Street Joint Venture, thereby reducing Columbia Property Trust's equity interest in each joint venture to 55.0% . Columbia Property Trust has determined that none of the joint ventures qualify as variable interest entities. However, Columbia Property Trust and its partners have substantive participation rights in the joint ventures, including management selection and termination, and the approval of operating and capital decisions. As such, Columbia Property Trust uses the equity method of accounting to record its investment in these joint ventures. Under the equity method, the investment in the joint venture is recorded at cost and adjusted for cash contributions and distributions, and allocations of income or loss. Columbia Property Trust evaluates the recoverability of its investments in unconsolidated joint ventures in accordance with accounting standards for equity investments by first reviewing the investment for any indicators of impairment. If indicators are present, Columbia Property Trust estimates the fair value of the investment. If the carrying value of the investment is greater than the estimated fair value, management makes an assessment of whether the impairment is "temporary" or "other-than-temporary." 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 assessment as described above, Columbia Property Trust has determined that none of its investments in joint ventures are other than temporarily impaired as of March 31, 2018 . Mortgage Debt and Related Guaranty The Market Square joint venture is the only joint venture with mortgage debt. As of March 31, 2018 and December 31, 2017 , the outstanding balance on the interest-only Market Square mortgage note is $325.0 million , bearing interest at 5.07% . The Market Square mortgage note matures on July 1, 2023. Columbia Property Trust guarantees a portion of the Market Square mortgage note, the amount of which has been reduced to $11.2 million as of March 31, 2018 and December 31, 2017 , as a result of leasing at the Market Square Buildings. The amount of the guaranty will continue to be reduced as space is leased. 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, 2018 December 31, 2017 March 31, 2018 December 31, 2017 March 31, 2018 December 31, 2017 Market Square Joint Venture $ 585,274 $ 590,115 $ 324,721 $ 324,708 $ 244,516 $ 244,506 University Circle Joint Venture 230,103 227,368 — — 222,159 221,154 333 Market Street Joint Venture 382,462 385,297 — — 366,601 368,994 114 Fifth Avenue Joint Venture 384,478 392,486 — — 164,113 170,525 1800 M Street Joint Venture 454,473 458,964 — — 435,970 438,227 $ 2,036,790 $ 2,054,230 $ 324,721 $ 324,708 $ 1,433,359 $ 1,443,406 (1) Excludes basis differences. There is an aggregate net basis difference of $285.2 million and $32.0 million as of March 31, 2018 and December 31, 2017, respectively, between the historical costs recorded at the joint venture level, and Columbia Property Trust's investment in the joint ventures. The differences result from the basis step-up in accordance with ASU 2017-05, as described in Note 2, Accounting Policies , and the differences in the timing of each partner's interest acquisition and formation costs incurred by Columbia Property Trust. The basis differences are being amortized to income (loss) from unconsolidated joint ventures over the lives of the underlying assets or liabilities. Summarized income statement information for the unconsolidated joint ventures for the three months ended March 31, 2018 and March 31, 2017 is as follows (in thousands): Total Revenues Net Income (Loss) Columbia Property Trust's Share of Net Income (Loss) (1) 2018 2017 2018 2017 2018 2017 Market Square Joint Venture $ 11,015 $ 10,134 $ (3,009 ) $ (3,696 ) $ (1,534 ) $ (1,885 ) University Circle Joint Venture 10,341 — 5,505 — 3,429 — 333 Market Street Joint Venture 6,668 — 3,557 — 2,227 — 114 Fifth Avenue Joint Venture 10,300 — (2,331 ) — (1,154 ) — 1800 M Street Joint Venture 8,897 — 243 — 133 — $ 47,221 $ 10,134 $ 3,965 $ (3,696 ) $ 3,101 $ (1,885 ) (1) Excludes the amortization of basis differences described above. Property and Asset Management Fees Columbia Property Trust provides property and asset management services to the Market Square Joint Venture, the University Circle Joint Venture , the 333 Market Street Joint Venture, and the 1800 M Street Joint Venture. Under these agreements, Columbia Property Trust oversees the day-to-day operations of these joint ventures and their properties, including property management, property accounting, and other administrative services. During the three months ended March 31, 2018 and 2017 , Columbia Property Trust earned the following fees from these unconsolidated joint ventures (in thousands): Three Months Ended 2018 2017 Market Square Joint Venture $ 523 $ 474 University Circle Joint Venture 529 — 333 Market Street Joint Venture 197 — 1800 M Street Joint Venture 510 — $ 1,759 $ 474 Columbia Property Trust also received reimbursements of property operating costs of $1.0 million and $0.2 million for the three months ended March 31, 2018 and 2017 , respectively, which are included in other property income revenues in the accompanying consolidated statements of operations. Property management fees of $0.4 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, 2018 and December 31, 2017 , respectively.

Line of Credit and Notes Payabl

Line of Credit and Notes Payable	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Line of Credit and Notes Payable	Line of Credit and Notes Payable As of March 31, 2018 and December 31, 2017 , 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, $300 Million Term Loan $ 300,000 $ 300,000 $300 Million Bridge Loan 180,000 300,000 $150 Million Term Loan 150,000 150,000 Revolving Credit Facility 134,000 152,000 263 Shuman Boulevard mortgage note (1) 49,000 49,000 One Glenlake mortgage note 22,363 23,176 Less: Deferred financing costs related to term loans and notes payable, net of accumulated amortization (2,641 ) (2,991 ) $ 832,722 $ 971,185 (1) The OfficeMax lease at 263 Shuman Boulevard expired in May 2017, and the mortgage note matured in July 2017. On April 13, 2018, Columbia Property Trust transferred the property to the lender in settlement of the loan principal, accrued interest expense, and accrued property operating expenses, which resulted in a gain on extinguishment of debt of $24.0 million in the second quarter of 2018. In the first quarter of 2018, Columbia Property Trust accrued related interest expense of $1.3 million at the default rate of 10.55% , and property operating expenses of $0.6 million , primarily related to property taxes and repairs and maintenance. Fair Value of Debt The estimated fair value of Columbia Property Trust's line of credit and notes payable as of March 31, 2018 and December 31, 2017 , was approximately $835.9 million and $975.3 million , respectively. The related carrying value of the line of credit and notes payable as of March 31, 2018 and December 31, 2017 , was $835.4 million and $974.2 million , respectively. Columbia Property Trust estimated the fair value of the $300 Million Term Loan (the " $300 Million Term Loan"), the $300 Million Bridge Loan (the $300 Million Bridge Loan"), and the Revolving Credit Facility (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). The fair values of all other debt instruments were estimated based on discounted cash flow analyses using the current incremental borrowing rates for similar types of borrowing arrangements as of the respective reporting dates. The discounted cash flow method of assessing fair value results in a general approximation of value, and such value may never actually be realized. Interest Paid and Capitalized and Debt Covenants During the three months ended March 31, 2018 and 2017 , Columbia Property Trust made interest payments totaling approximately $6.3 million and $6.2 million , respectively, of which approximately $0.9 million and $0.1 million , respectively, were capitalized. As of March 31, 2018 , Columbia Property Trust believes it is in compliance with the restrictive financial covenants on its term loans, the Revolving Credit Facility, and notes payable obligations. Debt Repayments On February 2, 2018, Columbia Property Trust repaid $120.0 million of the outstanding balance on the $300 Million Bridge Loan, using a portion of the proceeds from the February 2018 Allianz Transaction, as described in Note 3, Real Estate Transactions . The remaining proceeds were used to pay down the Revolving Credit Facility.

Bonds Payable

Bonds Payable	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Bonds Payable	Bonds Payable Columbia Property Trust has two series of bonds outstanding as of March 31, 2018 and December 31, 2017: $350.0 million outstanding on 10 -year, unsecured 3.650% senior notes issued at 99.626% of their face value (the "2026 Bonds Payable"); and $350.0 million outstanding on 10 -year, unsecured 4.150% senior notes issued at at 99.859% of their face value (the "2025 Bonds Payable"). Both series of bonds require semi-annual interest payments. The principal amount of the 2026 Bonds Payable is due and payable on August 15, 2026, and the principal amount of the 2025 Bonds Payable is due and payable on April 1, 2025. Interest payments of $6.4 million and $6.5 million were made on the 2026 Bonds Payable during the three months ended March 31, 2018 and 2017, respectively. Columbia Property Trust is subject to substantially similar covenants under the 2026 Bonds Payable and the 2025 Bonds Payable. As of March 31, 2018 , Columbia Property Trust believes it was in compliance with the restrictive financial covenants on the 2026 Bonds Payable and the 2025 Bonds Payable. As of March 31, 2018 and December 31, 2017 , the estimated fair value of the 2026 Bonds Payable and the 2025 Bonds Payable was approximately $702.8 million . The related carrying value of the bonds payable, net of discounts, as of March 31, 2018 and December 31, 2017 was $698.6 million and $698.5 million , respectively. The fair value of the bonds payable was estimated based on discounted cash flow analyses using the current incremental borrowing rates for similar types of borrowings as the bonds as of the respective reporting dates (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, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Commitments Under Existing Lease Agreements Certain lease agreements include provisions that, at the option of the tenant, may obligate Columbia Property Trust to expend capital to expand an existing property or provide other expenditures for the benefit of the tenant. As of March 31, 2018 , no tenants have exercised such options that have not been materially satisfied or recorded as a liability on the accompanying consolidated balance sheet. Guaranty of Debt of Unconsolidated Joint Venture Upon entering into the Market Square Joint Venture in October 2015, Columbia Property Trust entered into a guaranty of a $25.0 million portion of the Market Square mortgage note, the amount of which is reduced as space is leased. As a result of leasing, the guaranty has been reduced to $11.2 million as of March 31, 2018 . Columbia Property Trust believes that the likelihood of making a payment under this guaranty is remote; therefore, no liability has been recorded related to this guaranty as of March 31, 2018 . Litigation Columbia Property Trust is subject to various legal proceedings, claims, and administrative proceedings arising in the ordinary course of business, some of which are expected to be covered by liability insurance. Management makes assumptions and estimates concerning the likelihood and amount of any reasonably possible loss relating to these matters using the latest information available. Columbia Property Trust records a liability for litigation if an unfavorable outcome is probable and the amount of loss or range of loss can be reasonably estimated. If an unfavorable outcome is probable and a reasonable estimate of the loss is a range, Columbia Property Trust accrues the best estimate within the range. If no amount within the range is a better estimate than any other amount, Columbia Property Trust accrues the minimum amount within the range. If an unfavorable outcome is probable but the amount of the loss cannot be reasonably estimated, Columbia Property Trust discloses the nature of the litigation and indicates that an estimate of the loss or range of loss cannot be made. If an unfavorable outcome is reasonably possible and the estimated loss is material, Columbia Property Trust discloses the nature and estimate of the possible loss of the litigation. Columbia Property Trust does not disclose information with respect to litigation where the possibility of an unfavorable outcome is considered to be remote. Based on current expectations, such matters, both individually and in the aggregate, are not expected to have a material adverse effect on the liquidity, results of operations, business, or financial condition of Columbia Property Trust. Columbia Property Trust is not currently involved in any legal proceedings of which management would consider the outcome to be reasonably likely to have a material adverse effect on the results of operations, liquidity, or financial condition of Columbia Property Trust.

Stockholders' Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity Common Stock Repurchase Program Columbia Property Trust's board of directors authorized a stock repurchase program to purchase up to an aggregate of $200.0 million of its common stock, par value $0.01 per share, from September 4, 2017 through September 4, 2019 (the "2017 Stock Repurchase Program"). During the three months ended March 31, 2018 , Columbia Property Trust repurchased 1.3 million shares at an average price of $21.03 per share, for aggregate purchases of $27.3 million . As of March 31, 2018 , $167.6 million remains available for repurchases under the 2017 Stock Repurchase Program. Common stock repurchases are charged against equity as incurred, and the repurchased shares are retired. Columbia Property Trust will continue to evaluate the purchase of shares, primarily through open market transactions, which are subject to market conditions and other factors. Long-Term Incentive Compensation Columbia Property Trust maintains a shareholder-approved, long-term incentive plan (the "LTI Plan") that provides for grants of up to 4.8 million shares of stock to be made to certain employees and independent directors of Columbia Property Trust. Employee Awards Under the LTI Plan, Columbia Property Trust grants time-based stock awards and performance-based restricted stock unit awards to its employees. On January 1, 2018, Columbia Property Trust granted 128,486 shares of time-based stock awards to employees, which will vest ratably on each anniversary of the grant over the next four years. On January 1, 2018, Columbia Property Trust granted 176,702 performance-based restricted stock unit awards, of which 75% will vest at the conclusion of a three -year performance period, and the remaining 25% will vest one year later (the "Performance-Based RSUs"). Consistent with the 2017 plan, the payout of the 2018 Performance-Based RSUs will be determined based on Columbia Property Trust’s total shareholder return relative to the FTSE NAREIT Equity Office Index. Upon reaching a predefined performance threshold, the payout of Performance-Based RSUs will range from 50% to 150% . A rollforward of unvested employee stock awards and Performance-Based RSUs granted under the LTI Plan for the three months ended March 31, 2018 follows: For the Three Months Ended Shares Weighted-Average (1) Unvested awards – beginning of period 718 $ 20.45 Granted 375 $ 17.50 Vested (275 ) $ 16.00 Forfeited (11 ) $ 18.60 Unvested awards – end of period (2) 807 $ 20.62 (1) Columbia Property Trust determined the weighted-average, grant-date fair value using the market closing price on the date of the respective grants. (2) As of March 31, 2018 , we expect approximately 776,000 of the 807,000 unvested awards to ultimately vest, assuming a weighted average forfeiture rate of 3.8% , which was determined based on historical forfeiture rates. Director Awards Columbia Property Trust grants equity retainers to its directors under the LTI Plan. Such grants vest immediately. Beginning in May 2017, these grants are made annually. Prior to this time, the independent directors' equity retainers were paid quarterly. During the three months ended March 31, 2018 , Columbia Property Trust did not grant any equity awards, and during the three months ended March 31, 2017 , Columbia Property Trust paid the following equity retainers: Date of Grant Shares Grant-Date Fair Value 2017 Director Grants: January 3, 2017 8,279 $ 21.58 Stock-Based Compensation Expense For the three months ended March 31, 2018 and 2017 , Columbia Property Trust incurred the stock-based compensation expense related to the following events (in thousands): Three Months Ended 2018 2017 Amortization of awards granted under the LTI Plan $ 1,036 $ 917 Amortization of future awards under the LTI Plan (1) 492 595 Issuance of shares to independent directors — 179 Total stock-based compensation expense $ 1,528 $ 1,691 (1) Reflects amortization of awards made under the LTI Plan for service during the current period, for which shares will be issued in future periods. These expenses are included in general and administrative expenses in the accompanying consolidated statements of operations. As of March 31, 2018 and December 31, 2017 , there was $12.3 million and $8.1 million , respectively, of unrecognized compensation costs related to unvested awards under the LTI Plan, which will be amortized over the respective vesting period, ranging from one to four years at the time of grant. In 2017, Columbia Property Trust changed from a one -year performance period to a three -year performance period and granted additional shares to bridge the vesting gap created as a result.

Supplemental Disclosures of Non

Supplemental Disclosures of Noncash Investing and Financing Activities	3 Months Ended
	Mar. 31, 2018
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, 2018 and 2017 (in thousands): Three Months Ended 2018 2017 Deposits applied to sales of real estate $ — $ 10,000 Amortization of net discounts on debt $ 45 $ 45 Accrued capital expenditures and deferred lease costs $ 12,414 $ 12,534 Market value adjustments to interest rate swaps that qualify for hedge accounting treatment $ 2,514 $ 634 Cumulative-effect adjustment for the adoption of ASU 2017-05 $ 357,755 $ — Common stock issued to employees and directors, and amortized (net of income tax withholdings) $ (443 ) $ 235

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share For the three months ended March 31, 2018 and 2017 , 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, 2018 and 2017 (in thousands): Three Months Ended 2018 2017 Net income $ 1,498 $ 74,722 Distributions paid on unvested shares (73 ) (84 ) Net income used to calculate basic and diluted earnings per share $ 1,425 $ 74,638 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, 2018 and 2017 , respectively (in thousands): Three Months Ended 2018 2017 Weighted-average common shares – basic 119,082 122,003 Plus incremental weighted-average shares from time-vested conversions, less assumed share repurchases: Previously granted awards, unvested 70 64 Future period LTI Plan awards 198 262 Weighted-average common shares – diluted 119,350 122,329

Revenues

Revenues	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Revenues	Revenues Columbia Property Trust derives most of its revenues, rental income, and tenant reimbursements from leases. All leases on real estate assets held by Columbia Property Trust are classified as operating leases, and the related base rental income is generally recognized on a straight-line basis over the terms of the respective leases. Tenant reimbursements are recognized as revenue in the period that the related operating costs are incurred and are billed to tenants pursuant to the terms of the underlying leases. Rental income and tenant reimbursements collected in advance are recorded as deferred income in the accompanying consolidated balance sheets. Lease termination fees are recorded as other income and recognized on a straight-line basis from when Columbia Property Trust receives notification of termination through the date the tenant has lost the right to lease the space and Columbia Property Trust has satisfied all obligations under the related lease or lease termination agreement. For the three months ended March 31, 2018 and 2017, Columbia Property Trust earned lease termination revenues of $0.4 million and $0.3 million respectively. On January 1, 2018, Columbia Property Trust adopted ASU 2014-09 using the modified retrospective approach. ASU 2014-09 applies to all open contracts with customers, except those that are within the scope of other topics in the FASB's Accounting Standards Codification, such as real estate leases. ASU 2014-09 requires companies to perform a five-step analysis of transactions to determine when and how revenue is recognized. For Columbia Property Trust, the new standard applies primarily to the following revenues: Asset and Property Management Fee Income Under asset and property management agreements in place with its unconsolidated joint ventures, Columbia Property Trust earns revenue for performing asset and property management functions for properties owned through its joint ventures, as further described in Note 4, Unconsolidated Joint Ventures . During the three months ended March 31, 2018 and 2017, Columbia Property Trust earned revenues of $1.8 million and $0.5 million , respectively, under these agreements. Asset and property management services are ongoing and routine, and are provided on a recurring basis. Therefore, under ASU 2014-09, such fees are recognized ratably over the service period, usually a period of three months, which is consistent with the accounting method used prior to January 1, 2018. Columbia Property Trust receives payments quarterly for asset management fees and monthly for property management fees. Leasing Override Fees Under the asset management agreements for properties owned through unconsolidated joint ventures, Columbia Property Trust earns leasing override fees equal to a percentage of the total rental payments to be made by the tenant over the term of the lease. Under ASU 2014-09, such fees are recognized when Columbia Property Trust's obligation to perform is complete, typically upon execution of the lease. Prior to January 1, 2018, such fees were recognized when billable to the applicable joint venture, typically upon commencement of the lease. As a result of implementing ASU 2014-09, effective January 1, 2018, Columbia Property Trust recorded $0.3 million of lease override fees receivable as prepaid expenses and other assets, and recognized a cumulative-effect adjustment to increase retained earnings by the same amount. For the three months ended March 31, 2018 and 2017, Columbia Property Trust did not earn any leasing override fees. Salary and Other Reimbursement Revenue Under the property management agreements for properties owned through unconsolidated joint ventures, Columbia Property Trust receives reimbursements for salaries and property operating costs for certain ongoing and routine services that are provided by Columbia Property Trust employees on a recurring basis. Under ASU 2014-09, such revenues are recognized ratably over the service period, usually a period of one month, three months or one year, which is consistent with the accounting method used prior to January 1, 2018. For the three months ended March 31, 2018 and 2017, Columbia Property Trust earned salary and other reimbursement revenue of $1.0 million and $0.2 million , respectively, which is included in other property income on the accompanying consolidated statements of income. Miscellaneous Revenue Columbia Property Trust also receives revenues for services provided to its tenants through the TRS Entities, including fitness centers, shuttles, and cafeterias, which are include in other property income on the accompanying consolidated statements of income. Such services are ongoing and routine, and are provided on a recurring basis. Under ASU 2014-09, these revenues are recognized ratably over the service period, usually a period of one month or one quarter, which is consistent with the accounting method used prior to January 1, 2018.

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2018
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 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, 2018 , Columbia Property Trust had the following reportable segments: New York, San Francisco, Atlanta, Washington, D.C., Boston, Los Angeles, and all other office markets. The all other office markets reportable segment consists of properties in similar low-barrier-to-entry geographic locations in which Columbia Property Trust does not have a substantial presence and does not plan to make further investments. During the periods presented, there have been no material intersegment transactions. Net operating income ("NOI") is a non-GAAP financial measure. NOI is the primary performance measure reviewed by management to assess operating performance of properties and is calculated by deducting operating expenses from operating revenues. Operating revenues include rental income, tenant reimbursements, hotel income, and other property income; and operating expenses include property and hotel operating costs. The NOI performance metric consists of only 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 (in thousands): Three Months Ended March 31, 2018 2017 New York (1) $ 40,909 $ 27,586 San Francisco (2) 23,520 27,182 Atlanta 9,858 9,328 Washington, D.C. (3) 13,972 7,383 Boston 3,370 2,904 Los Angeles 1,920 1,778 All other office markets 3,936 9,591 Total office segments 97,485 85,752 Hotel — 1,218 Corporate 681 (120 ) Total operating revenues $ 98,166 $ 86,850 (1) Includes operating revenues for 49.5% of 114 5th Avenue based on our ownership interest, from January 1, 2018 through March 31, 2018. (2) Includes operating revenues from 333 Market Street and University Circle based on our ownership interest: 77.5% from January 1, 2018 through January 31, 2018; 55.0% from February 1, 2018 through March 31, 2018; and 100.0% from January 1, 2017 through March 31, 2017. (3) Includes operating revenues for 51.0% of the Market Square buildings based on our ownership interest, for all periods presented. Includes operating revenues for 55.0% of 1800 M Street from January 1, 2018 through March 31, 2018. A reconciliation of GAAP revenues to operating revenues is presented below (in thousands): Three Months Ended March 31, 2018 2017 Total revenues $ 73,710 $ 82,156 Operating revenues included in income (loss) from unconsolidated joint ventures (1) 26,215 5,168 Less: asset and property management fee income (2) (1,759 ) (474 ) Total operating revenues $ 98,166 $ 86,850 (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 (loss) from unconsolidated joint ventures in the accompanying consolidated statements of operations. (2) See Note 4, Unconsolidated Joint Ventures , of the accompanying consolidated financial statements. The following table presents NOI by geographic reportable segment (in thousands): Three Months Ended March 31, 2018 2017 New York (1) $ 24,179 $ 17,616 San Francisco (2) 19,554 19,866 Atlanta 8,754 8,293 Washington, D.C. (3) 8,330 3,278 Boston 1,768 1,409 Los Angeles 1,208 1,082 All other office markets 3,291 6,930 Total office segments 67,084 58,474 Hotel — (876 ) Corporate (225 ) (22 ) Total $ 66,859 $ 57,576 (1) Includes NOI for 49.5% of 114 5th Avenue based on our ownership interest, from January 1, 2018 through March 31, 2018. (2) Includes NOI from 333 Market Street and University Circle based on our ownership interest: 77.5% from January 1, 2018 through January 31, 2018; 55.0% from February 1, 2018 through March 31, 2018; and 100.0% from January 1, 2017 through March 31, 2017. (3) Includes NOI for 51.0% of the Market Square buildings based on our ownership interest, for all periods presented. Includes NOI for 55.0% of 1800 M Street from January 1, 2018 through March 31, 2018. A reconciliation of GAAP net income to NOI is presented below (in thousands): Three Months Ended March 31, 2018 2017 Net income $ 1,498 $ 74,722 Depreciation 20,835 21,605 Amortization 8,016 9,457 General and administrative – corporate 7,794 8,768 General and administrative – joint ventures 731 — Net interest expense 15,892 14,565 Interest income from development authority bonds (1,800 ) (1,800 ) Gain on sale of unconsolidated joint venture interests (762 ) — Loss on early extinguishment of debt — 45 Income tax expense (benefit) 7 (388 ) Asset and property management fee income (1,759 ) (474 ) Adjustments included in income (loss) from unconsolidated joint ventures 16,407 4,229 Gain on sales of real estate assets — (73,153 ) NOI $ 66,859 $ 57,576

Financial Information for Paren

Financial Information for Parent Guarantor, Issuer Subsidiary, and Non-Guarantor Subsidiaries	3 Months Ended
	Mar. 31, 2018
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Financial Information for Parent Guarantor, Issuer Subsidiary and Non-Guarantor Subsidiaries	Financial Information for Parent Guarantor, Issuer Subsidiary, and Non-Guarantor Subsidiaries The 2026 Bonds Payable and the 2025 Bonds Payable (see Note 6, Bonds Payable ) were issued by Columbia Property Trust OP, and are guaranteed by Columbia Property Trust. In accordance with SEC Rule 3-10(c), Columbia Property Trust includes herein condensed consolidating financial information in lieu of separate financial statements of the subsidiary issuer (Columbia Property Trust OP), as defined in the bond indentures, because all of the following criteria are met: (1) The subsidiary issuer (Columbia Property Trust OP) is 100% owned by the parent company guarantor (Columbia Property Trust); (2) The guarantee is full and unconditional; and (3) No other subsidiary of the parent company guarantor (Columbia Property Trust) guarantees the 2026 Bonds Payable or the 2025 Bonds Payable. Columbia Property Trust uses the equity method with respect to its investment in subsidiaries included in its condensed consolidating financial statements. We have corrected the presentation of intercompany cash transfers between the REIT Parent and its subsidiaries in the consolidating statements of cash flow. Instead of showing one amount for intercompany transfers between each entity group, intercompany transfers are broken out by cash flow type (i.e., operating, investing, and financing) for all periods presented, consistent with the equity method of accounting. All such changes are eliminated in consolidation, and therefore do not impact Columbia Property Trust's consolidated financial statement totals. Management has concluded that the effect of this correction is not material to the consolidated financial statements. This change had the following impact to the condensed consolidating statement of cash flows for the three months ended March 31, 2017 : increase to operating cash flows for the parent and issuer of $63.2 million and $72.2 million , respectively; and increase (decrease) in investing cash flows for the parent, issuer, and non-guarantors of $93.4 million , $361.1 million and $219.3 million , respectively; and increase (decrease) in financing cash flows for the parent, issuer, and non-guarantors of $(156.6) million , $(433.3) million and $(219.3) million , respectively. The impact to individual financial statement captions within the condensed consolidating statement of cash flows is footnoted below. Set forth below are Columbia Property Trust's condensed consolidating balance sheets as of March 31, 2018 and December 31, 2017 , as well as its condensed consolidating statements of operations and its condensed consolidating statements of comprehensive income for the three months ended March 31, 2018 and 2017 ; and its condensed consolidating statements of cash flows for the three months ended March 31, 2018 and 2017 . Condensed Consolidating Balance Sheets (in thousands): As of March 31, 2018 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Assets: Real estate assets, at cost: Land $ — $ — $ 825,208 $ — $ 825,208 Buildings and improvements, net — 2,006 2,057,732 — 2,059,738 Intangible lease assets, net — — 194,233 — 194,233 Construction in progress — — 46,814 — 46,814 Total real estate assets — 2,006 3,123,987 — 3,125,993 Investments in unconsolidated joint ventures — 1,058,441 — — 1,058,441 Cash and cash equivalents 255 10,455 10,358 — 21,068 Investment in subsidiaries 2,525,277 1,339,612 — (3,864,889 ) — Tenant receivables, net of allowance — 30 2,405 — 2,435 Straight-line rent receivable — — 102,415 — 102,415 Prepaid expenses and other assets 317,702 338,633 14,508 (645,654 ) 25,189 Intangible lease origination costs, net — — 40,540 — 40,540 Deferred lease costs, net — — 142,719 — 142,719 Investment in development authority bonds — — 120,000 — 120,000 Total assets $ 2,843,234 $ 2,749,177 $ 3,556,932 $ (4,510,543 ) $ 4,638,800 Liabilities: Line of credit and notes payable, net $ — $ 761,479 $ 714,553 $ (643,310 ) $ 832,722 Bonds payable, net — 693,954 — — 693,954 Accounts payable, accrued expenses, and accrued capital expenditures 775 10,032 94,971 (6 ) 105,772 Due to affiliates — — 2,338 (2,338 ) — Deferred income — 81 18,183 — 18,264 Intangible lease liabilities, net — — 25,629 — 25,629 Obligations under capital lease — — 120,000 — 120,000 Total liabilities 775 1,465,546 975,674 (645,654 ) 1,796,341 Equity: Total equity 2,842,459 1,283,631 2,581,258 (3,864,889 ) 2,842,459 Total liabilities and equity $ 2,843,234 $ 2,749,177 $ 3,556,932 $ (4,510,543 ) $ 4,638,800 Condensed Consolidating Balance Sheets (in thousands): As of December 31, 2017 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Assets: Real estate assets, at cost: Land $ — $ — $ 825,208 $ — $ 825,208 Building and improvements, net — 2,110 2,061,309 — 2,063,419 Intangible lease assets, net — — 199,260 — 199,260 Construction in progress — — 44,742 — 44,742 Total real estate assets — 2,110 3,130,519 — 3,132,629 Investments in unconsolidated joint ventures — 943,241 1 — 943,242 Cash and cash equivalents 692 5,079 3,796 — 9,567 Investment in subsidiaries 2,238,577 1,186,594 — (3,425,171 ) — Tenant receivables, net of allowance — 30 2,098 — 2,128 Straight-line rent receivable — — 92,235 — 92,235 Prepaid expenses and other assets 317,364 336,598 19,375 (645,654 ) 27,683 Intangible lease origination costs, net — — 42,959 — 42,959 Deferred lease costs, net — — 141,096 — 141,096 Investment in development authority bonds — — 120,000 — 120,000 Total assets $ 2,556,633 $ 2,473,652 $ 3,552,079 $ (4,070,825 ) $ 4,511,539 Liabilities: Lines of credit and notes payable, net $ — $ 899,168 $ 715,327 $ (643,310 ) $ 971,185 Bonds payable, net — 693,756 — — 693,756 Accounts payable, accrued expenses, and accrued capital expenditures 732 10,325 113,949 (4 ) 125,002 Dividends payable 23,961 — — — 23,961 Due to affiliates — — 2,340 (2,340 ) — Deferred income 4 81 18,396 — 18,481 Intangible lease liabilities, net — — 27,218 — 27,218 Obligations under capital leases — — 120,000 — 120,000 Total liabilities 24,697 1,603,330 997,230 (645,654 ) 1,979,603 Equity: Total equity 2,531,936 870,322 2,554,849 (3,425,171 ) 2,531,936 Total liabilities and equity $ 2,556,633 $ 2,473,652 $ 3,552,079 $ (4,070,825 ) $ 4,511,539 Consolidating Statements of Operations (in thousands): For the Three Months Ended March 31, 2018 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Revenues: Rental income $ — $ — $ 64,817 $ — $ 64,817 Tenant reimbursements — — 5,543 — 5,543 Asset and property management fee income 905 — 854 — 1,759 Other property income — — 1,591 — 1,591 905 — 72,805 — 73,710 Expenses: Property operating costs — — 23,062 — 23,062 Asset and property management fees — — 208 — 208 Depreciation — 167 20,668 — 20,835 Amortization — — 8,016 — 8,016 General and administrative – corporate 198 2,309 5,287 — 7,794 General and administrative – unconsolidated joint ventures — — 731 — 731 198 2,476 57,972 — 60,646 Real estate operating income (loss) 707 (2,476 ) 14,833 — 13,064 Other income (expense): Interest expense — (12,434 ) (10,494 ) 7,033 (15,895 ) Interest and other income 3,555 3,478 1,803 (7,033 ) 1,803 Gain on sale of unconsolidated joint venture interests — 762 — — 762 3,555 (8,194 ) (8,691 ) — (13,330 ) Income (loss) before income taxes and unconsolidated entities: 4,262 (10,670 ) 6,142 — (266 ) Income tax expense — — (7 ) — (7 ) Income (loss) from unconsolidated entities (2,764 ) 9,194 — (4,659 ) 1,771 Net income $ 1,498 $ (1,476 ) $ 6,135 $ (4,659 ) $ 1,498 Consolidating Statements of Operations (in thousands): For the Three Months Ended March 31, 2017 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Revenues: Rental income $ — $ 51 $ 71,221 $ (99 ) $ 71,173 Tenant reimbursements — 34 8,550 — 8,584 Hotel income — — 1,339 — 1,339 Asset and property management fee income 245 — 229 — 474 Other property income — — 604 (18 ) 586 245 85 81,943 (117 ) 82,156 Expenses: Property operating costs — 172 24,032 (99 ) 24,105 Hotel operating costs — — 2,076 — 2,076 Asset and property management fee expenses: Related-party — 3 — (3 ) — Other — — 269 — 269 Depreciation — 82 21,523 — 21,605 Amortization — 5 9,452 — 9,457 General and administrative – corporate 39 2,518 6,226 (15 ) 8,768 39 2,780 63,578 (117 ) 66,280 Real estate operating income (loss) 206 (2,695 ) 18,365 — 15,876 Other income (expense): Interest expense — (10,284 ) (10,463 ) 5,632 (15,115 ) Interest and other income 4,101 2,078 1,803 (5,632 ) 2,350 Loss on early extinguishment of debt — — (45 ) — (45 ) 4,101 (8,206 ) (8,705 ) — (12,810 ) Income (loss) before income taxes and unconsolidated entities: 4,307 (10,901 ) 9,660 — 3,066 Income tax benefit — — 388 — 388 Income (loss) from unconsolidated joint venture 70,415 63,099 — (135,399 ) (1,885 ) Income (loss) before sale of real estate assets: 74,722 52,198 10,048 (135,399 ) 1,569 Gain on sale of real estate assets — 11,050 62,103 — 73,153 Net income $ 74,722 $ 63,248 $ 72,151 $ (135,399 ) $ 74,722 Consolidating Statements of Comprehensive Income (in thousands): For the Three Months Ended March 31, 2018 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Net income $ 1,498 $ (1,476 ) $ 6,135 $ (4,659 ) $ 1,498 Market value adjustments to interest rate swaps 2,514 2,514 — (2,514 ) 2,514 Comprehensive income $ 4,012 $ 1,038 $ 6,135 $ (7,173 ) $ 4,012 For the Three Months Ended March 31, 2017 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Net income $ 74,722 $ 63,248 $ 72,151 $ (135,399 ) $ 74,722 Market value adjustments to interest rate swaps 634 634 — (634 ) 634 Comprehensive income $ 75,356 $ 63,882 $ 72,151 $ (136,033 ) $ 75,356 Consolidating Statements of Cash Flows (in thousands): For the Three Months Ended March 31, 2018 Columbia Property Trust (Guarantor) Columbia Property Trust OP (the Issuer) Non- Guarantors Consolidating Adjustments Columbia Property Trust Cash flows from operating activities $ 708 $ (5,326 ) $ 19,389 $ — $ 14,771 Cash flows from investing activities: Net proceeds from sale of investments in unconsolidated joint ventures — 235,083 — — 235,083 Investment in real estate and related assets — — (23,877 ) — (23,877 ) Investments in unconsolidated joint ventures — (1,541 ) — — (1,541 ) Distributions from unconsolidated joint ventures — 2,976 — — 2,976 Distributions from subsidiaries 75,935 (9,988 ) — (65,947 ) — Net cash provided by (used in) investing activities 75,935 226,530 (23,877 ) (65,947 ) 212,641 Cash flows from financing activities: Borrowings, net of fees — 108,983 — — 108,983 Repayments — (247,000 ) (814 ) — (247,814 ) Distributions (47,819 ) (77,811 ) 11,864 65,947 (47,819 ) Repurchases of common stock (29,261 ) — — — (29,261 ) Net cash provided by (used in) financing activities (77,080 ) (215,828 ) 11,050 65,947 (215,911 ) Net increase (decrease) in cash and cash equivalents (437 ) 5,376 6,562 — 11,501 Cash and cash equivalents, beginning of period 692 5,079 3,796 — 9,567 Cash and cash equivalents, end of period $ 255 $ 10,455 $ 10,358 $ — $ 21,068 Consolidating Statements of Cash Flows (in thousands): For the Three Months Ended March 31, 2017 Columbia Property Trust (Guarantor) Columbia Property Trust OP (the Issuer) Non- Guarantors Consolidating Adjustments Columbia Property Trust Cash flows from operating activities $ 64,000 $ 59,949 $ 16,848 $ (135,399 ) $ 5,398 Cash flows from investing activities: Net proceeds from sales of real estate (1) — 49,531 455,129 — 504,660 Investment in real estate and related assets (12,000 ) (59 ) (21,115 ) — (33,174 ) Investments in unconsolidated joint ventures — (1,230 ) — — (1,230 ) Distributions from subsidiaries (2) 362,170 311,574 — (673,744 ) — Net cash provided by investing activities 350,170 359,816 434,014 (673,744 ) 470,256 Cash flows from financing activities: Repayments — — (74,406 ) — (74,406 ) Distributions (3) (65,892 ) (416,068 ) (388,400 ) 809,143 (61,217 ) Repurchases of common stock (1,461 ) — — — (1,461 ) Net cash used in financing activities (67,353 ) (416,068 ) (462,806 ) 809,143 (137,084 ) Net increase (decrease) in cash and cash equivalents 346,817 3,697 (11,944 ) — 338,570 Cash and cash equivalents, beginning of period 174,420 16,509 25,156 — 216,085 Cash and cash equivalents, end of period $ 521,237 $ 20,206 $ 13,212 $ — $ 554,655 (1) Net proceeds from sales of real estate increased (decreased) from what was reported in the March 31, 2017 Form 10-Q by $(268.8) million , $49.5 million , and $219.3 million for the parent, issuer, and non-guarantors, respectively. (2) Distributions from subsidiaries increased (decreased) from what was reported in the March 31, 2017 Form 10-Q by $362.2 million , $311.6 million , and $(673.8) million for the parent, issuer, and eliminations, respectively. (3) Distributions (increased) decreased from what was reported in the March 31, 2017 Form 10-Q by $(4.7) million , $(416.1) million , $(388.4) million , and $809.2 million , for the parent, issuer, non-guarantors, and eliminations, respectively. The intercompany transfers, net line item is no longer presented based on the changes to the other line items described herein.

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Event Columbia Property Trust has evaluated subsequent events in connection with the preparation of the consolidated financial statements and notes thereto included in this report on Form 10-Q and noted the following subsequent event: • On April 13, 2018, Columbia Property Trust transferred 263 Shuman Boulevard to the lender in settlement of the related mortgage note, as described in Note 5, Line of Credit and Notes Payable .

Summary of Significant Accoun23

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2018
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 our unconsolidated joint ventures, which are accounted for using the equity method of accounting, see Note 4, Unconsolidated Joint Ventures . Columbia Property Trust's consolidated financial statements include the accounts of Columbia Property Trust, Columbia Property Trust OP, and any variable-interest entity in which Columbia Property Trust or Columbia Property Trust OP was deemed the primary beneficiary. With respect to entities that are not variable interest entities, Columbia Property Trust's consolidated financial statements also include the accounts of any entity in which Columbia Property Trust, Columbia Property Trust OP, or their subsidiaries own a controlling financial interest and any limited partnership in which Columbia Property Trust, Columbia Property Trust OP, or their subsidiaries own a controlling general partnership interest. All intercompany balances and transactions have been eliminated in consolidation.
Fair Value Measurements	Fair Value Measurements Columbia Property Trust estimates the fair value of its assets and liabilities (where currently required under GAAP) consistent with the provisions of Accounting Standard Codification 820, Fair Value Measurements ("ASC 820"). Under this standard, fair value is defined as the price that would be received upon sale of an asset or paid upon transfer of a liability in an orderly transaction between market participants at the measurement date, under current market conditions. While various techniques and assumptions can be used to estimate fair value depending on the nature of the asset or liability, the accounting standard for fair value measurements and disclosures provides the following fair value technique parameters and hierarchy, depending upon availability: Level 1 – Assets or liabilities for which the identical term is traded on an active exchange, such as publicly traded instruments or futures contracts. Level 2 – Assets or liabilities valued based on observable market data for similar instruments. Level 3 – Assets or liabilities for which significant valuation assumptions are not readily observable in the market. Such assets or liabilities are valued based on the best available data, some of which may be internally developed. Significant assumptions may include risk premiums that a market participant would consider.
Real Estate Assets	Real Estate Assets Columbia Property Trust is required to make subjective assessments as to the useful lives of its depreciable assets. To determine the appropriate useful life of an asset, Columbia Property Trust considers the period of future benefit of the asset. These assessments have a direct impact on net income. The estimated useful lives of its assets by class are as follows: Buildings 40-45 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 three months.
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 carrying amounts of its real estate and related intangible assets, of both operating properties and properties under redevelopment, may not be recoverable. When indicators of potential impairment are present that suggest that the carrying amounts of real estate assets and related intangible assets and liabilities may not be recoverable, Columbia Property Trust assesses the recoverability of these assets and liabilities by determining whether the respective carrying values will be recovered through the estimated undiscounted future cash flows expected from the use of the 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 value 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 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. Based on the assessment as described above, Columbia Property Trust has determined that the carrying values of all its real estate assets and related intangible assets are recoverable as of March 31, 2018 . 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.
Intangible Assets and Liabilities Arising From In-Place Leases Where Columbia Property Trust Is the Lessor	Intangible Assets and Liabilities Arising From In-Place Leases Where Columbia Property Trust Is the Lessor Upon the acquisition of real properties, Columbia Property Trust allocates the purchase price of the properties to tangible assets, consisting of land, building, site improvements, and identified intangible assets and liabilities, including the value of in-place leases, based in each case on Columbia Property Trust's estimate of their fair values in accordance with ASC 820 (see Fair Value Measurements section above for additional detail).
Intangible Assets and Liabilities Arising From In-Place Leases Where Columbia Property Trust Is the Lessee	Intangible Assets and Liabilities Arising From In-Place Leases Where Columbia Property Trust Is the Lessee Columbia Property Trust is the lessee on certain in-place ground leases. Intangible above-market and below-market in-place lease values are recorded as intangible lease liabilities and assets, respectively, and are amortized as an adjustment to property operating cost over the remaining term of the respective leases.
Interest Rate Swap Agreements	Interest Rate Swap Agreements Columbia Property Trust enters into interest rate swap contracts to mitigate its interest rate risk on the related financial instruments. Columbia Property Trust does not enter into derivative or interest rate swap transactions for speculative purposes; however, certain of its derivatives may not qualify for hedge accounting treatment. Columbia Property Trust records the fair value of its interest rate swaps on its consolidated balance sheet either as prepaid expenses and other assets or as accounts payable, accrued expenses, and accrued capital expenditures. Changes in the fair value of interest rate swaps that are designated as cash flow hedges are recorded as other comprehensive income. All changes in the fair value of interest rate swaps that do not qualify for hedge accounting treatment are recorded as gain or loss on interest rate swaps. Amounts received or paid under interest rate swap agreements are recorded as interest expense for contracts that qualify for hedge accounting treatment and as gain or loss on interest rate swaps for contracts that do not qualify for hedge accounting treatment.
Income Taxes	Income Taxes Columbia Property Trust has elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended (the "Code") and has operated as such beginning with its taxable year ended December 31, 2003. To qualify as a REIT, Columbia Property Trust must meet certain organizational and operational requirements, including a requirement to distribute at least 90% of its REIT taxable income, as defined by the Code, to its stockholders. As a REIT, Columbia Property Trust generally is not subject to income tax on income it distributes to stockholders. Columbia Property Trust's stockholder distributions typically exceed its taxable income due to the inclusion of noncash expenses, such as depreciation, in taxable income. As a result, Columbia Property Trust typically does not incur federal income taxes other than as described in the following paragraph. Columbia Property Trust is, however, subject to certain state and local taxes related to the operations of properties in certain locations, which have been provided for in the accompanying consolidated financial statements. Columbia Property Trust TRS, LLC, Columbia KCP TRS, LLC, and Columbia Energy TRS, LLC (collectively, the "TRS Entities") are wholly owned subsidiaries of Columbia Property Trust and are organized as Delaware limited liability companies. The TRS Entities, among other things, provide tenant services that Columbia Property Trust, as a REIT, cannot otherwise provide. Columbia Property Trust has elected to treat the TRS Entities as taxable REIT subsidiaries. Columbia Property Trust may perform certain additional, noncustomary services for tenants of its buildings through the TRS Entities; however, any earnings related to such services are subject to federal and state income taxes. In addition, for Columbia Property Trust to continue to qualify as a REIT, Columbia Property Trust must limit its investments in taxable REIT subsidiaries to 20% of the value of the total assets. The TRS Entities' deferred tax assets and liabilities represent temporary differences between the financial reporting basis and the tax basis of assets and liabilities based on the enacted rates expected to be in effect when the temporary differences reverse. If applicable, Columbia Property Trust records interest and penalties related to uncertain tax positions as general and administrative expense in the accompanying consolidated statements of operations.
Reclassification	Reclassification Certain prior period amounts may be reclassified to conform to the current-period financial statement presentation. Within revenues on the accompanying consolidated statements of operations, management fees earned from unconsolidated joint ventures have been reclassified from other property income to a dedicated line item, asset and property management fee income, for all periods presented.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In February 2017, the FASB issued Accounting Standard Update 2017-05 , Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Non-Financial Assets ("ASU 2017-05"), which applies to the partial sale of non-financial assets, including real estate assets, to unconsolidated joint ventures. ASU 2017-05 requires Columbia Property Trust to measure its residual joint venture interest in properties transferred to unconsolidated joint ventures at fair value as of the transaction date by recognizing a gain or loss on 100% of the asset transferred (i.e. to fully step-up the basis of the residual investment in the joint venture). Columbia Property Trust adopted the new rule effective January 1, 2018 on a modified retrospective basis by recording a cumulative-effect adjustment to equity equal to the total gain on residual joint venture interests as of the transaction dates for the partial sales of Market Square, 333 Market Street, and University Circle, adjusted to reflect the impact of depreciating the additional step-ups through January 1, 2018. The adoption of this standard resulted in an increase to investments in unconsolidated joint ventures and equity of $357.8 million . In February 2016, the FASB issued Accounting Standards Update 2016-02 , Leases ("ASU 2016-02"), which amends the existing standards for lease accounting by requiring lessees to recognize most leases on their balance sheets and by making targeted changes to lessor accounting and reporting. The new standard will require lessees to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months, and classify such leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase of the leased asset by the lessee, or not. This classification will determine whether the lease expense is recognized based on an effective interest method (finance leases) or on a straight-line basis over the term of the lease (operating leases). Leases with a term of 12 months or less will be accounted for using an approach that is similar to existing guidance for operating leases today. The new standard requires lessors to account for leases, using an approach that is substantially equivalent to existing guidance as applies to sales-type leases, direct financing leases, and operating leases. ASU 2016-02 will be effective for Columbia Property Trust on January 1, 2019 and supersedes previous leasing standards. Upon implementing ASU 2016-02, Columbia Property Trust expects to record right of use assets and the related liabilities, for certain of its ground leases. Columbia Property Trust is in the process of evaluating the financial impact of this accounting change. In May 2014, the FASB issued Accounting Standards Update 2014-09, Revenue from Contracts with Customers ("ASU 2014-09"), which establishes a comprehensive model to account for revenues arising from contracts with customers. ASU 2014-09 applies to all contracts with customers, except those that are within the scope of other topics in the FASB's Accounting Standards Codification, such as real estate leases. ASU 2014-09 requires companies to perform a five-step analysis of transactions to determine when and how revenue is recognized. For Columbia Property Trust, the new standard applies primarily to fees earned from managing properties owned by its unconsolidated joint ventures and parking agreements with tenants. Given the structure of these agreements, the adoption of ASU 2014-09 has not materially impacted the timing or amount of Columbia Property Trust's revenues; however, Columbia Property Trust has included more extensive disclosures about its revenue streams and contracts with customers, which are presented in Note 11, Revenues . ASU 2014-09 was effective for Columbia Property Trust on January 1, 2018. Columbia Property Trust has applied the modified retrospective approach of adoption, which resulted in the recognition of a cumulative effect adjustment to equity of $0.3 million , with no retrospective adjustments to prior periods.

Summary of Significant Accoun24

Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2018
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 40-45 years Building and site improvements 5-25 years Tenant improvements Shorter of economic life or lease term Intangible lease assets Lease term
Schedule of Intangible Assets and Liabilities	As of March 31, 2018 and December 31, 2017 , Columbia Property Trust had the following intangible assets and liabilities, arising from in-place leases, excluding amounts held for sale (in thousands): Intangible Lease Assets Intangible Lease Origination Costs Intangible Below-Market In-Place Lease Liabilities Above-Market In-Place Lease Assets Absorption Period Costs March 31, 2018 Gross $ 2,481 $ 149,929 $ 100,424 $ 44,894 Accumulated Amortization (883 ) (74,805 ) (59,884 ) (19,265 ) Net $ 1,598 $ 75,124 $ 40,540 $ 25,629 December 31, 2017 Gross $ 2,481 $ 149,927 $ 100,424 $ 46,878 Accumulated Amortization (833 ) (70,465 ) (57,465 ) (19,660 ) Net $ 1,648 $ 79,462 $ 42,959 $ 27,218 For the three months ended March 31, 2018 and 2017 , Columbia Property Trust recognized the following amortization of intangible lease assets and liabilities (in thousands): Intangible Lease Assets Intangible Lease Origination Costs Intangible Below-Market In-Place Lease Liabilities Above-Market In-Place Lease Assets Absorption Period Costs For the Three Months Ended March 31, 2018 $ 51 $ 4,339 $ 2,419 $ 1,589 For the Three Months Ended March 31, 2017 $ 288 $ 5,068 $ 3,089 $ 2,405 The net intangible assets and liabilities remaining as of March 31, 2018 will be amortized as follows (in thousands): Intangible Lease Assets Intangible Lease Origination Costs Intangible Below-Market In-Place Lease Liabilities Above-Market In-Place Lease Assets Absorption Period Costs For the remainder of 2018 $ 153 $ 12,583 $ 7,152 $ 4,736 For the years ending December 31: 2019 203 14,665 8,651 5,968 2020 203 12,801 7,770 4,535 2021 203 8,112 3,727 1,591 2022 203 6,585 2,708 1,287 2023 203 5,944 2,480 1,264 Thereafter 430 14,434 8,052 6,248 $ 1,598 $ 75,124 $ 40,540 $ 25,629
Schedule of Future Amortization Expense for Remaining Net Below-Market Lease Assets	As of March 31, 2018 , the remaining net below-market intangible lease assets will be amortized as follows (in thousands): For the remainder of 2018 $ 1,912 For the Years Ending December 31: 2019 2,549 2020 2,549 2021 2,549 2022 2,549 2023 2,549 Thereafter 102,854 $ 117,511
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 $ 3,417 $ 903
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position	Three Months Ended 2018 2017 Market value adjustment to interest rate swaps designated as hedging instruments and included in other comprehensive income $ 2,514 $ 634

Real Estate Transactions (Table

Real Estate Transactions (Tables)	3 Months Ended
	Mar. 31, 2018
Real Estate [Abstract]
Schedule of Properties Acquired	Purchase Price Allocations for Consolidated Property Acquisitions: 149 Madison Avenue 245-249 West 17th Street 218 West 18th Street Location New York, NY New York, NY New York, NY Date Acquired November 28, 2017 October 11, 2017 October 11, 2017 Purchase Price (in thousands): Land $ 59,112 $ 113,149 $ 43,836 Building and improvements 28,989 194,109 126,957 Intangible lease assets — 27,408 12,120 Intangible lease origination costs — 13,062 4,168 Intangible below market lease liability — (7,131 ) (11,757 ) Total purchase price $ 88,101 $ 340,597 $ 175,324 During 2017 , Columbia Property Trust acquired the following properties and partial interests in properties: Property Location Date Percent Acquired Purchase Price (1) (in thousands) 2017 149 Madison Avenue New York, NY November 28, 2017 100.0 % $ 87,700 1800 M Street Washington, D.C. October 11, 2017 55.0 % $ 231,550 (2) 245-249 West 17th Street & 218 West 18th Street New York, NY October 11, 2017 100.0 % $ 514,100 114 Fifth Avenue New York, NY July 6, 2017 49.5 % $ 108,900 (2) (1) Exclusive of transaction costs and price adjustments. See purchase price allocation table below for a breakout of the net purchase price for wholly owned properties. (2) Purchase price is for our partial interests in the properties. These properties are owned through unconsolidated joint ventures.
Unaudited Pro Forma Financial Results	The following unaudited pro forma financial results for Columbia Property Trust have been prepared for informational purposes only and are not necessarily indicative of future results or of actual results that would have been achieved had these acquisitions been consummated as of January 1, 2016 (in thousands): Three Months Ended 2017 Revenues $ 91,784 Net income $ 77,049 Net income per share – basic $ 0.63 Net income per share – diluted $ 0.63
Schedule of Properties Sold	During 2017 and the first three months of 2018, Columbia Property Trust sold the following properties or partial interests in properties of unconsolidated joint ventures: Property Location Date % Sold Sales Price (1) (in thousands) Gain on Sale (in thousands) 2018 University Circle & (2) San Francisco, CA February 1, 2018 22.5 % (2) $ 235,300 (2) $ 762 2017 University Circle & 333 Market Street (3) San Francisco, CA July 6, 2017 22.5 % (3) $ 234,000 (3) $ 102,400 Key Center Tower & Marriott (4) Cleveland, OH January 31, 2017 100.0 % $ 267,500 $ 9,500 Houston Properties (5) Houston, TX January 6, 2017 100.0 % $ 272,000 $ 63,700 (1) Exclusive of transaction costs and price adjustments. (2) Sale price is for the partial interests in the unconsolidated joint ventures that were sold. As previously agreed, Columbia Property Trust sold an additional 22.5% interest in the University Circle property and 333 Market Street building to its joint venture partner, Allianz, for $235.3 million (the "February 2018 Allianz Transaction"). The February 2018 Allianz Transaction resulted in a $0.8 million gain, which is presented as gain on sale of unconsolidated joint venture interests on the accompanying consolidated statements of operations. The gain is calculated as the sale price over the adjusted joint venture carrying value. In connection with implementing ASU 2017-05, effective January 1, 2018, the joint venture carrying value was increased to reflect its estimated fair value as of the joint venture formation date, July 6, 2017, less depreciation through January 1, 2018. For additional information, see footnote (3) below and Note 2, Summary of Significant Accounting Policies . The proceeds from this transaction were used to reduce the balance on the $300 Million Bridge Loan and the Revolving Credit Facility, as described in Note 5, Line of Credit and Notes Payable . (3) Sales price is for the partial interests in the properties that were sold. Columbia Property Trust contributed the 333 Market Street building and the University Circle property to joint ventures, and simultaneously sold a 22.5% interest in those joint ventures for $234.0 million to Allianz, an unrelated third party (collectively, the "San Francisco Joint Ventures"). (4) Key Center Tower & Marriott were sold in one transaction for $254.5 million of gross proceeds and a $13.0 million , 10 -year accruing note receivable from the principal of the buyer. As a result, Columbia Property Trust has applied the installment method to account for this transaction, and deferred $13.0 million of the total $22.5 million gain on sale. The Key Center Tower and Key Center Marriott generated a net loss of $1.9 million for the first 31 days of 2017, excluding the gain on sale. (5) 5 Houston Center, Energy Center I, and 515 Post Oak were sold in one transaction. These properties generated a net loss of $14.9 thousand for the first six days of 2017, excluding the gain on sale.

Unconsolidated Joint Ventures (

Unconsolidated Joint Ventures (Tables)	3 Months Ended
	Mar. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]
Summary of Financial Information for the Joint Ventures	During the three months ended March 31, 2018 and 2017 , Columbia Property Trust earned the following fees from these unconsolidated joint ventures (in thousands): Three Months Ended 2018 2017 Market Square Joint Venture $ 523 $ 474 University Circle Joint Venture 529 — 333 Market Street Joint Venture 197 — 1800 M Street Joint Venture 510 — $ 1,759 $ 474 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, 2018 December 31, 2017 March 31, 2018 December 31, 2017 March 31, 2018 December 31, 2017 Market Square Joint Venture $ 585,274 $ 590,115 $ 324,721 $ 324,708 $ 244,516 $ 244,506 University Circle Joint Venture 230,103 227,368 — — 222,159 221,154 333 Market Street Joint Venture 382,462 385,297 — — 366,601 368,994 114 Fifth Avenue Joint Venture 384,478 392,486 — — 164,113 170,525 1800 M Street Joint Venture 454,473 458,964 — — 435,970 438,227 $ 2,036,790 $ 2,054,230 $ 324,721 $ 324,708 $ 1,433,359 $ 1,443,406 (1) Excludes basis differences. There is an aggregate net basis difference of $285.2 million and $32.0 million as of March 31, 2018 and December 31, 2017, respectively, between the historical costs recorded at the joint venture level, and Columbia Property Trust's investment in the joint ventures. The differences result from the basis step-up in accordance with ASU 2017-05, as described in Note 2, Accounting Policies , and the differences in the timing of each partner's interest acquisition and formation costs incurred by Columbia Property Trust. The basis differences are being amortized to income (loss) from unconsolidated joint ventures over the lives of the underlying assets or liabilities. Summarized income statement information for the unconsolidated joint ventures for the three months ended March 31, 2018 and March 31, 2017 is as follows (in thousands): Total Revenues Net Income (Loss) Columbia Property Trust's Share of Net Income (Loss) (1) 2018 2017 2018 2017 2018 2017 Market Square Joint Venture $ 11,015 $ 10,134 $ (3,009 ) $ (3,696 ) $ (1,534 ) $ (1,885 ) University Circle Joint Venture 10,341 — 5,505 — 3,429 — 333 Market Street Joint Venture 6,668 — 3,557 — 2,227 — 114 Fifth Avenue Joint Venture 10,300 — (2,331 ) — (1,154 ) — 1800 M Street Joint Venture 8,897 — 243 — 133 — $ 47,221 $ 10,134 $ 3,965 $ (3,696 ) $ 3,101 $ (1,885 ) (1) Excludes the amortization of basis differences described above. As of March 31, 2018 and December 31, 2017 , Columbia Property Trust owned interests in the following properties through joint ventures, which are accounted for using the equity method of accounting: Carrying Value of Investment (1) Joint Venture Property Name Geographic Market Ownership Interest March 31, 2018 December 31, 2017 Market Square Joint Venture Market Square Washington, D.C. 51.0 % $ 134,609 $ 128,411 University Circle Joint Venture University Circle San Francisco 55.0 % (2) 298,852 173,798 333 Market Street Joint Venture 333 Market Street San Francisco 55.0 % (2) 276,869 288,236 114 Fifth Avenue Joint Venture 114 Fifth Avenue New York 49.5 % 106,937 110,311 1800 M Street Joint Venture 1800 M Street Washington, D.C. 55.0 % 241,174 242,486 $ 1,058,441 $ 943,242 (1) Includes basis differences. Columbia Property Trust adopted ASU 2017-05 effective January 1, 2018, which requires Columbia Property Trust to measure its residual joint venture interest in the properties transferred to unconsolidated joint ventures at fair value as of the transaction date (i.e., to fully step-up the basis of the residual investment in the joint venture). The new rule was adopted on a modified retrospective basis by recording a cumulative-effect adjustment to equity equal to the original gain or loss as of the respective transaction dates, adjusted to reflect the impact of depreciating the additional step-ups through January 1, 2018. The adoption of this standard resulted in an increase to investments in unconsolidated joint ventures and equity by $357.8 million on January 1, 2018, for the previous partial sales of interest in the Market Square, 333 Market Street, and University Circle properties. (2) On February 1, 2018, Allianz acquired from Columbia Property Trust an additional 22.5% interest in each of the University Circle Joint Venture and the 333 Market Street Joint Venture, thereby reducing Columbia Property Trust's equity interest in each joint venture to 55.0% .

Line of Credit and Notes Paya27

Line of Credit and Notes Payable (Tables)	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Schedule of Line of Credit and Notes Payable Indebtedness	As of March 31, 2018 and December 31, 2017 , 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, $300 Million Term Loan $ 300,000 $ 300,000 $300 Million Bridge Loan 180,000 300,000 $150 Million Term Loan 150,000 150,000 Revolving Credit Facility 134,000 152,000 263 Shuman Boulevard mortgage note (1) 49,000 49,000 One Glenlake mortgage note 22,363 23,176 Less: Deferred financing costs related to term loans and notes payable, net of accumulated amortization (2,641 ) (2,991 ) $ 832,722 $ 971,185 (1) The OfficeMax lease at 263 Shuman Boulevard expired in May 2017, and the mortgage note matured in July 2017. On April 13, 2018, Columbia Property Trust transferred the property to the lender in settlement of the loan principal, accrued interest expense, and accrued property operating expenses, which resulted in a gain on extinguishment of debt of $24.0 million in the second quarter of 2018. In the first quarter of 2018, Columbia Property Trust accrued related interest expense of $1.3 million at the default rate of 10.55% , and property operating expenses of $0.6 million , primarily related to property taxes and repairs and maintenance.

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Summary of the Activity of Employee Stock Grants	A rollforward of unvested employee stock awards and Performance-Based RSUs granted under the LTI Plan for the three months ended March 31, 2018 follows: For the Three Months Ended Shares Weighted-Average (1) Unvested awards – beginning of period 718 $ 20.45 Granted 375 $ 17.50 Vested (275 ) $ 16.00 Forfeited (11 ) $ 18.60 Unvested awards – end of period (2) 807 $ 20.62 (1) Columbia Property Trust determined the weighted-average, grant-date fair value using the market closing price on the date of the respective grants. (2) As of March 31, 2018 , we expect approximately 776,000 of the 807,000 unvested awards to ultimately vest, assuming a weighted average forfeiture rate of 3.8% , which was determined based on historical forfeiture rates.
Summary of Shares Granted to Independent Directors	During the three months ended March 31, 2018 , Columbia Property Trust did not grant any equity awards, and during the three months ended March 31, 2017 , Columbia Property Trust paid the following equity retainers: Date of Grant Shares Grant-Date Fair Value 2017 Director Grants: January 3, 2017 8,279 $ 21.58
Schedule of Stock-based Compensation Expense Incurred	For the three months ended March 31, 2018 and 2017 , Columbia Property Trust incurred the stock-based compensation expense related to the following events (in thousands): Three Months Ended 2018 2017 Amortization of awards granted under the LTI Plan $ 1,036 $ 917 Amortization of future awards under the LTI Plan (1) 492 595 Issuance of shares to independent directors — 179 Total stock-based compensation expense $ 1,528 $ 1,691 (1) Reflects amortization of awards made under the LTI Plan for service during the current period, for which shares will be issued in future periods.

Supplemental Disclosures of N29

Supplemental Disclosures of Noncash Investing and Financing Activities (Tables)	3 Months Ended
	Mar. 31, 2018
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, 2018 and 2017 (in thousands): Three Months Ended 2018 2017 Deposits applied to sales of real estate $ — $ 10,000 Amortization of net discounts on debt $ 45 $ 45 Accrued capital expenditures and deferred lease costs $ 12,414 $ 12,534 Market value adjustments to interest rate swaps that qualify for hedge accounting treatment $ 2,514 $ 634 Cumulative-effect adjustment for the adoption of ASU 2017-05 $ 357,755 $ — Common stock issued to employees and directors, and amortized (net of income tax withholdings) $ (443 ) $ 235

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2018
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, 2018 and 2017 (in thousands): Three Months Ended 2018 2017 Net income $ 1,498 $ 74,722 Distributions paid on unvested shares (73 ) (84 ) Net income used to calculate basic and diluted earnings per share $ 1,425 $ 74,638 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, 2018 and 2017 , respectively (in thousands): Three Months Ended 2018 2017 Weighted-average common shares – basic 119,082 122,003 Plus incremental weighted-average shares from time-vested conversions, less assumed share repurchases: Previously granted awards, unvested 70 64 Future period LTI Plan awards 198 262 Weighted-average common shares – diluted 119,350 122,329

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Reconciliation of Revenue from Segments to Consolidated	The following table presents operating revenues included in NOI by geographic reportable segment (in thousands): Three Months Ended March 31, 2018 2017 New York (1) $ 40,909 $ 27,586 San Francisco (2) 23,520 27,182 Atlanta 9,858 9,328 Washington, D.C. (3) 13,972 7,383 Boston 3,370 2,904 Los Angeles 1,920 1,778 All other office markets 3,936 9,591 Total office segments 97,485 85,752 Hotel — 1,218 Corporate 681 (120 ) Total operating revenues $ 98,166 $ 86,850 (1) Includes operating revenues for 49.5% of 114 5th Avenue based on our ownership interest, from January 1, 2018 through March 31, 2018. (2) Includes operating revenues from 333 Market Street and University Circle based on our ownership interest: 77.5% from January 1, 2018 through January 31, 2018; 55.0% from February 1, 2018 through March 31, 2018; and 100.0% from January 1, 2017 through March 31, 2017. (3) Includes operating revenues for 51.0% of the Market Square buildings based on our ownership interest, for all periods presented. Includes operating revenues for 55.0% of 1800 M Street from January 1, 2018 through March 31, 2018. A reconciliation of GAAP revenues to operating revenues is presented below (in thousands): Three Months Ended March 31, 2018 2017 Total revenues $ 73,710 $ 82,156 Operating revenues included in income (loss) from unconsolidated joint ventures (1) 26,215 5,168 Less: asset and property management fee income (2) (1,759 ) (474 ) Total operating revenues $ 98,166 $ 86,850 (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 (loss) from unconsolidated joint ventures in the accompanying consolidated statements of operations. (2) See Note 4, Unconsolidated Joint Ventures , of the accompanying consolidated financial statements.
Schedule of Segment Reporting Information, by Segment	A reconciliation of GAAP net income to NOI is presented below (in thousands): Three Months Ended March 31, 2018 2017 Net income $ 1,498 $ 74,722 Depreciation 20,835 21,605 Amortization 8,016 9,457 General and administrative – corporate 7,794 8,768 General and administrative – joint ventures 731 — Net interest expense 15,892 14,565 Interest income from development authority bonds (1,800 ) (1,800 ) Gain on sale of unconsolidated joint venture interests (762 ) — Loss on early extinguishment of debt — 45 Income tax expense (benefit) 7 (388 ) Asset and property management fee income (1,759 ) (474 ) Adjustments included in income (loss) from unconsolidated joint ventures 16,407 4,229 Gain on sales of real estate assets — (73,153 ) NOI $ 66,859 $ 57,576 The following table presents NOI by geographic reportable segment (in thousands): Three Months Ended March 31, 2018 2017 New York (1) $ 24,179 $ 17,616 San Francisco (2) 19,554 19,866 Atlanta 8,754 8,293 Washington, D.C. (3) 8,330 3,278 Boston 1,768 1,409 Los Angeles 1,208 1,082 All other office markets 3,291 6,930 Total office segments 67,084 58,474 Hotel — (876 ) Corporate (225 ) (22 ) Total $ 66,859 $ 57,576 (1) Includes NOI for 49.5% of 114 5th Avenue based on our ownership interest, from January 1, 2018 through March 31, 2018. (2) Includes NOI from 333 Market Street and University Circle based on our ownership interest: 77.5% from January 1, 2018 through January 31, 2018; 55.0% from February 1, 2018 through March 31, 2018; and 100.0% from January 1, 2017 through March 31, 2017. (3) Includes NOI for 51.0% of the Market Square buildings based on our ownership interest, for all periods presented. Includes NOI for 55.0% of 1800 M Street from January 1, 2018 through March 31, 2018.

Financial Information for Par32

Financial Information for Parent Guarantor, Issuer Subsidiary, and Non-Guarantor Subsidiaries (Tables)	3 Months Ended
	Mar. 31, 2018
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Consolidating Balance Sheets	Condensed Consolidating Balance Sheets (in thousands): As of March 31, 2018 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Assets: Real estate assets, at cost: Land $ — $ — $ 825,208 $ — $ 825,208 Buildings and improvements, net — 2,006 2,057,732 — 2,059,738 Intangible lease assets, net — — 194,233 — 194,233 Construction in progress — — 46,814 — 46,814 Total real estate assets — 2,006 3,123,987 — 3,125,993 Investments in unconsolidated joint ventures — 1,058,441 — — 1,058,441 Cash and cash equivalents 255 10,455 10,358 — 21,068 Investment in subsidiaries 2,525,277 1,339,612 — (3,864,889 ) — Tenant receivables, net of allowance — 30 2,405 — 2,435 Straight-line rent receivable — — 102,415 — 102,415 Prepaid expenses and other assets 317,702 338,633 14,508 (645,654 ) 25,189 Intangible lease origination costs, net — — 40,540 — 40,540 Deferred lease costs, net — — 142,719 — 142,719 Investment in development authority bonds — — 120,000 — 120,000 Total assets $ 2,843,234 $ 2,749,177 $ 3,556,932 $ (4,510,543 ) $ 4,638,800 Liabilities: Line of credit and notes payable, net $ — $ 761,479 $ 714,553 $ (643,310 ) $ 832,722 Bonds payable, net — 693,954 — — 693,954 Accounts payable, accrued expenses, and accrued capital expenditures 775 10,032 94,971 (6 ) 105,772 Due to affiliates — — 2,338 (2,338 ) — Deferred income — 81 18,183 — 18,264 Intangible lease liabilities, net — — 25,629 — 25,629 Obligations under capital lease — — 120,000 — 120,000 Total liabilities 775 1,465,546 975,674 (645,654 ) 1,796,341 Equity: Total equity 2,842,459 1,283,631 2,581,258 (3,864,889 ) 2,842,459 Total liabilities and equity $ 2,843,234 $ 2,749,177 $ 3,556,932 $ (4,510,543 ) $ 4,638,800 Condensed Consolidating Balance Sheets (in thousands): As of December 31, 2017 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Assets: Real estate assets, at cost: Land $ — $ — $ 825,208 $ — $ 825,208 Building and improvements, net — 2,110 2,061,309 — 2,063,419 Intangible lease assets, net — — 199,260 — 199,260 Construction in progress — — 44,742 — 44,742 Total real estate assets — 2,110 3,130,519 — 3,132,629 Investments in unconsolidated joint ventures — 943,241 1 — 943,242 Cash and cash equivalents 692 5,079 3,796 — 9,567 Investment in subsidiaries 2,238,577 1,186,594 — (3,425,171 ) — Tenant receivables, net of allowance — 30 2,098 — 2,128 Straight-line rent receivable — — 92,235 — 92,235 Prepaid expenses and other assets 317,364 336,598 19,375 (645,654 ) 27,683 Intangible lease origination costs, net — — 42,959 — 42,959 Deferred lease costs, net — — 141,096 — 141,096 Investment in development authority bonds — — 120,000 — 120,000 Total assets $ 2,556,633 $ 2,473,652 $ 3,552,079 $ (4,070,825 ) $ 4,511,539 Liabilities: Lines of credit and notes payable, net $ — $ 899,168 $ 715,327 $ (643,310 ) $ 971,185 Bonds payable, net — 693,756 — — 693,756 Accounts payable, accrued expenses, and accrued capital expenditures 732 10,325 113,949 (4 ) 125,002 Dividends payable 23,961 — — — 23,961 Due to affiliates — — 2,340 (2,340 ) — Deferred income 4 81 18,396 — 18,481 Intangible lease liabilities, net — — 27,218 — 27,218 Obligations under capital leases — — 120,000 — 120,000 Total liabilities 24,697 1,603,330 997,230 (645,654 ) 1,979,603 Equity: Total equity 2,531,936 870,322 2,554,849 (3,425,171 ) 2,531,936 Total liabilities and equity $ 2,556,633 $ 2,473,652 $ 3,552,079 $ (4,070,825 ) $ 4,511,539
Consolidating Statements of Operations	Consolidating Statements of Operations (in thousands): For the Three Months Ended March 31, 2018 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Revenues: Rental income $ — $ — $ 64,817 $ — $ 64,817 Tenant reimbursements — — 5,543 — 5,543 Asset and property management fee income 905 — 854 — 1,759 Other property income — — 1,591 — 1,591 905 — 72,805 — 73,710 Expenses: Property operating costs — — 23,062 — 23,062 Asset and property management fees — — 208 — 208 Depreciation — 167 20,668 — 20,835 Amortization — — 8,016 — 8,016 General and administrative – corporate 198 2,309 5,287 — 7,794 General and administrative – unconsolidated joint ventures — — 731 — 731 198 2,476 57,972 — 60,646 Real estate operating income (loss) 707 (2,476 ) 14,833 — 13,064 Other income (expense): Interest expense — (12,434 ) (10,494 ) 7,033 (15,895 ) Interest and other income 3,555 3,478 1,803 (7,033 ) 1,803 Gain on sale of unconsolidated joint venture interests — 762 — — 762 3,555 (8,194 ) (8,691 ) — (13,330 ) Income (loss) before income taxes and unconsolidated entities: 4,262 (10,670 ) 6,142 — (266 ) Income tax expense — — (7 ) — (7 ) Income (loss) from unconsolidated entities (2,764 ) 9,194 — (4,659 ) 1,771 Net income $ 1,498 $ (1,476 ) $ 6,135 $ (4,659 ) $ 1,498 Consolidating Statements of Operations (in thousands): For the Three Months Ended March 31, 2017 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Revenues: Rental income $ — $ 51 $ 71,221 $ (99 ) $ 71,173 Tenant reimbursements — 34 8,550 — 8,584 Hotel income — — 1,339 — 1,339 Asset and property management fee income 245 — 229 — 474 Other property income — — 604 (18 ) 586 245 85 81,943 (117 ) 82,156 Expenses: Property operating costs — 172 24,032 (99 ) 24,105 Hotel operating costs — — 2,076 — 2,076 Asset and property management fee expenses: Related-party — 3 — (3 ) — Other — — 269 — 269 Depreciation — 82 21,523 — 21,605 Amortization — 5 9,452 — 9,457 General and administrative – corporate 39 2,518 6,226 (15 ) 8,768 39 2,780 63,578 (117 ) 66,280 Real estate operating income (loss) 206 (2,695 ) 18,365 — 15,876 Other income (expense): Interest expense — (10,284 ) (10,463 ) 5,632 (15,115 ) Interest and other income 4,101 2,078 1,803 (5,632 ) 2,350 Loss on early extinguishment of debt — — (45 ) — (45 ) 4,101 (8,206 ) (8,705 ) — (12,810 ) Income (loss) before income taxes and unconsolidated entities: 4,307 (10,901 ) 9,660 — 3,066 Income tax benefit — — 388 — 388 Income (loss) from unconsolidated joint venture 70,415 63,099 — (135,399 ) (1,885 ) Income (loss) before sale of real estate assets: 74,722 52,198 10,048 (135,399 ) 1,569 Gain on sale of real estate assets — 11,050 62,103 — 73,153 Net income $ 74,722 $ 63,248 $ 72,151 $ (135,399 ) $ 74,722
Consolidating Statements of Comprehensive Income	Consolidating Statements of Comprehensive Income (in thousands): For the Three Months Ended March 31, 2018 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Net income $ 1,498 $ (1,476 ) $ 6,135 $ (4,659 ) $ 1,498 Market value adjustments to interest rate swaps 2,514 2,514 — (2,514 ) 2,514 Comprehensive income $ 4,012 $ 1,038 $ 6,135 $ (7,173 ) $ 4,012 For the Three Months Ended March 31, 2017 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Net income $ 74,722 $ 63,248 $ 72,151 $ (135,399 ) $ 74,722 Market value adjustments to interest rate swaps 634 634 — (634 ) 634 Comprehensive income $ 75,356 $ 63,882 $ 72,151 $ (136,033 ) $ 75,356
Consolidating Statements of Cash Flows	Consolidating Statements of Cash Flows (in thousands): For the Three Months Ended March 31, 2018 Columbia Property Trust (Guarantor) Columbia Property Trust OP (the Issuer) Non- Guarantors Consolidating Adjustments Columbia Property Trust Cash flows from operating activities $ 708 $ (5,326 ) $ 19,389 $ — $ 14,771 Cash flows from investing activities: Net proceeds from sale of investments in unconsolidated joint ventures — 235,083 — — 235,083 Investment in real estate and related assets — — (23,877 ) — (23,877 ) Investments in unconsolidated joint ventures — (1,541 ) — — (1,541 ) Distributions from unconsolidated joint ventures — 2,976 — — 2,976 Distributions from subsidiaries 75,935 (9,988 ) — (65,947 ) — Net cash provided by (used in) investing activities 75,935 226,530 (23,877 ) (65,947 ) 212,641 Cash flows from financing activities: Borrowings, net of fees — 108,983 — — 108,983 Repayments — (247,000 ) (814 ) — (247,814 ) Distributions (47,819 ) (77,811 ) 11,864 65,947 (47,819 ) Repurchases of common stock (29,261 ) — — — (29,261 ) Net cash provided by (used in) financing activities (77,080 ) (215,828 ) 11,050 65,947 (215,911 ) Net increase (decrease) in cash and cash equivalents (437 ) 5,376 6,562 — 11,501 Cash and cash equivalents, beginning of period 692 5,079 3,796 — 9,567 Cash and cash equivalents, end of period $ 255 $ 10,455 $ 10,358 $ — $ 21,068 Consolidating Statements of Cash Flows (in thousands): For the Three Months Ended March 31, 2017 Columbia Property Trust (Guarantor) Columbia Property Trust OP (the Issuer) Non- Guarantors Consolidating Adjustments Columbia Property Trust Cash flows from operating activities $ 64,000 $ 59,949 $ 16,848 $ (135,399 ) $ 5,398 Cash flows from investing activities: Net proceeds from sales of real estate (1) — 49,531 455,129 — 504,660 Investment in real estate and related assets (12,000 ) (59 ) (21,115 ) — (33,174 ) Investments in unconsolidated joint ventures — (1,230 ) — — (1,230 ) Distributions from subsidiaries (2) 362,170 311,574 — (673,744 ) — Net cash provided by investing activities 350,170 359,816 434,014 (673,744 ) 470,256 Cash flows from financing activities: Repayments — — (74,406 ) — (74,406 ) Distributions (3) (65,892 ) (416,068 ) (388,400 ) 809,143 (61,217 ) Repurchases of common stock (1,461 ) — — — (1,461 ) Net cash used in financing activities (67,353 ) (416,068 ) (462,806 ) 809,143 (137,084 ) Net increase (decrease) in cash and cash equivalents 346,817 3,697 (11,944 ) — 338,570 Cash and cash equivalents, beginning of period 174,420 16,509 25,156 — 216,085 Cash and cash equivalents, end of period $ 521,237 $ 20,206 $ 13,212 $ — $ 554,655 (1) Net proceeds from sales of real estate increased (decreased) from what was reported in the March 31, 2017 Form 10-Q by $(268.8) million , $49.5 million , and $219.3 million for the parent, issuer, and non-guarantors, respectively. (2) Distributions from subsidiaries increased (decreased) from what was reported in the March 31, 2017 Form 10-Q by $362.2 million , $311.6 million , and $(673.8) million for the parent, issuer, and eliminations, respectively. (3) Distributions (increased) decreased from what was reported in the March 31, 2017 Form 10-Q by $(4.7) million , $(416.1) million , $(388.4) million , and $809.2 million , for the parent, issuer, non-guarantors, and eliminations, respectively. The intercompany transfers, net line item is no longer presented based on the changes to the other line items described herein.

Organization (Details)

Organization (Details) ft² in Millions	Mar. 31, 2018ft²property
Real Estate Properties [Line Items]
Number of properties under development	1
Square feet of real estate | ft²	9.2
Percent of leased office space of owned properties	96.80%
Office Building
Real Estate Properties [Line Items]
Number of real estate properties	19
Wholly Owned Properties | Office Building
Real Estate Properties [Line Items]
Number of real estate properties	15
Unconsolidated Properties | Office Building
Real Estate Properties [Line Items]
Number of real estate properties	5

Summary of Significant Accoun34

Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Amortization of intangible assets	$ 7,955,000	$ 8,869,000
Hedge ineffectiveness recognized in earnings	$ 0	0
Requirement to distribute taxable income (at least)	90.00%
Limit on investments in taxable real estate investment trusts (percent)	20.00%
Intangible Below Market Lease Assets
Property, Plant and Equipment [Line Items]
Gross intangible assets	$ 140,900,000			$ 140,900,000
Amortization of intangible assets	$ 600,000	600,000
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life of real estate assets	40 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life of real estate assets	45 years
Building Improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life of real estate assets	5 years
Building Improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life of real estate assets	25 years
ASU 2017-05
Property, Plant and Equipment [Line Items]
Cumulative-effect adjustment for the adoption of ASU	$ 357,755,000	$ 0	$ 357,800,000
ASU 2014-09
Property, Plant and Equipment [Line Items]
Cumulative-effect adjustment for the adoption of ASU	$ 343,000
ASU 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Property, Plant and Equipment [Line Items]
Cumulative effect adjustment to equity			$ 300,000

Summary of Significant Accoun35

Summary of Significant Accounting Policies (Schedule of Intangible Assets & Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Gross Intangible In-Place Lease Assets and Liabilities [Abstract]
Intangible Lease Assets, Accumulated Amortization	$ (99,092)	$ (94,065)
Intangible lease assets, net	194,233	199,260
Intangible Lease Origination Costs, Accumulated Amortization	(59,884)	(57,465)
Intangible Lease Origination Costs, Net	40,540	42,959
Below Market Lease, Gross	44,894	46,878
Below Market Lease, Accumulated Amortization	(19,265)	(19,660)
Below Market Lease, Net	25,629	27,218
Above-Market In-Place Lease Assets
Gross Intangible In-Place Lease Assets and Liabilities [Abstract]
Intangible Lease Assets, Gross	2,481	2,481
Intangible Lease Assets, Accumulated Amortization	(883)	(833)
Intangible lease assets, net	1,598	1,648
Absorption Period Costs
Gross Intangible In-Place Lease Assets and Liabilities [Abstract]
Intangible Lease Assets, Gross	149,929	149,927
Intangible Lease Assets, Accumulated Amortization	(74,805)	(70,465)
Intangible lease assets, net	75,124	79,462
Intangible Lease Origination Costs
Gross Intangible In-Place Lease Assets and Liabilities [Abstract]
Intangible Lease Origination Costs, Gross	100,424	100,424
Intangible Lease Origination Costs, Accumulated Amortization	(59,884)	(57,465)
Intangible Lease Origination Costs, Net	$ 40,540	$ 42,959

Summary of Significant Accoun36

Summary of Significant Accounting Policies (Schedule of Recognized Amortization) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Lease Assets	$ 8,016	$ 9,457
Intangible Below-Market In-Place Lease Liabilities	1,589	2,405
Above-Market In-Place Lease Assets
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Lease Assets	51	288
Absorption Period Costs
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Lease Assets	4,339	5,068
Intangible Lease Origination Costs
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Lease Assets	$ 2,419	$ 3,089

Summary of Significant Accoun37

Summary of Significant Accounting Policies (Schedule of Future Amortization by Intangible Asset Class) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
For the Years Ending December 31:
Intangible lease assets, net	$ 194,233	$ 199,260
Intangible Lease Origination Costs, Net	40,540	42,959
Intangible Below-Market In-Place Lease Liabilities
For the remainder of 2018	4,736
For the years ending December 31:
2,019	5,968
2,020	4,535
2,021	1,591
2,021	1,287
2,022	1,264
Thereafter	6,248
Below Market Lease, Net	25,629	27,218
Above-Market In-Place Lease Assets
Finite-Lived Intangible Assets [Line Items]
For the remainder of 2018	153
For the Years Ending December 31:
2,019	203
2,020	203
2,021	203
2,022	203
2,023	203
Thereafter	430
Intangible lease assets, net	1,598	1,648
Absorption Period Costs
Finite-Lived Intangible Assets [Line Items]
For the remainder of 2018	12,583
For the Years Ending December 31:
2,019	14,665
2,020	12,801
2,021	8,112
2,022	6,585
2,023	5,944
Thereafter	14,434
Intangible lease assets, net	75,124	79,462
Intangible Lease Origination Costs
Finite-Lived Intangible Assets [Line Items]
For the remainder of 2018	7,152
For the Years Ending December 31:
2,019	8,651
2,020	7,770
2,021	3,727
2,022	2,708
2,023	2,480
Thereafter	8,052
Intangible Lease Origination Costs, Net	$ 40,540	$ 42,959

Summary of Significant Accoun38

Summary of Significant Accounting Policies (Schedule of Future Amortization for Below-Market Lease Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
For the Years Ending December 31:
Intangible lease assets, net	$ 194,233	$ 199,260
Intangible below market ground lease assets
Finite-Lived Intangible Assets [Line Items]
For the remainder of 2018	1,912
For the Years Ending December 31:
2,019	2,549
2,020	2,549
2,021	2,549
2,022	2,549
2,023	2,549
Thereafter	102,854
Intangible lease assets, net	$ 117,511

Summary of Significant Accoun39

Summary of Significant Accounting Policies (Interest Rate Swaps) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
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	$ 2,514	$ 634
Interest rate contracts | Prepaid expenses and other assets
Derivative, Fair Value, Net [Abstract]
Derivative designated as hedging instruments	$ 3,417		$ 903

Real Estate Transactions (Sched

Real Estate Transactions (Schedule of Properties Acquired) (Details) - USD ($) $ in Thousands	Nov. 28, 2017	Oct. 11, 2017	Jul. 06, 2017	Mar. 31, 2018	Mar. 31, 2017
Business Acquisition [Line Items]
Purchase Price				$ 1,541	$ 1,230
149 Madison Avenue
Business Acquisition [Line Items]
Ownership Interest	100.00%
Purchase Price	$ 87,700
245 - 249 West 17th Street & 218 West 18th Street
Business Acquisition [Line Items]
Ownership Interest		100.00%
Purchase Price		$ 514,100
Corporate Joint Venture | 1800 M Street Joint Venture
Business Acquisition [Line Items]
Ownership Interest		55.00%
Purchase Price		$ 231,550
Corporate Joint Venture | 114 Fifth Avenue Joint Venture
Business Acquisition [Line Items]
Ownership Interest			49.50%
Purchase Price			$ 108,900

Real Estate Transactions (Acqui

Real Estate Transactions (Acquisitions) (Details) ft² in Thousands, $ in Millions	Oct. 11, 2017USD ($)ft²Tenant	Mar. 31, 2018ft²	Nov. 28, 2017ft²	Jul. 06, 2017ft²
Business Acquisition [Line Items]
Square feet of real estate		9,200
149 Madison Avenue
Business Acquisition [Line Items]
Ownership percentage			100.00%
245 - 249 West 17th Street
Business Acquisition [Line Items]
Percentage of buildings leased	100.00%
Number of tenants | Tenant	4
218 West 18th Street
Business Acquisition [Line Items]
Percentage of buildings leased	100.00%
Number of tenants | Tenant	7
Office Building | 149 Madison Avenue
Business Acquisition [Line Items]
Square feet of real estate			127
Office Building | 245 - 249 West 17th Street
Business Acquisition [Line Items]
Square feet of real estate	281
Office Building | 218 West 18th Street
Business Acquisition [Line Items]
Square feet of real estate	166
Corporate Joint Venture | 1800 M Street Joint Venture
Business Acquisition [Line Items]
Square feet of real estate	581
Ownership percentage	55.00%
Percentage of buildings leased	94.00%
Investments in unconsolidated joint ventures | $	$ 421
Corporate Joint Venture | 114 Fifth Avenue Joint Venture
Business Acquisition [Line Items]
Square feet of real estate				352
Ownership percentage				49.50%
Corporate Joint Venture | Allianz | 114 Fifth Avenue Joint Venture
Business Acquisition [Line Items]
Ownership percentage				49.50%
Corporate Joint Venture | L & L Holding Company | 114 Fifth Avenue Joint Venture
Business Acquisition [Line Items]
Ownership percentage				1.00%
Twitter | Customer Concentration Risk | 245 - 249 West 17th Street
Business Acquisition [Line Items]
Concentration risk, percentage	76.00%
Room & Board | Customer Concentration Risk | 245 - 249 West 17th Street
Business Acquisition [Line Items]
Concentration risk, percentage	21.00%
Red Bull North America | Customer Concentration Risk | 218 West 18th Street
Business Acquisition [Line Items]
Concentration risk, percentage	25.00%
Company 3 | Customer Concentration Risk | 218 West 18th Street
Business Acquisition [Line Items]
Concentration risk, percentage	18.00%
SY Partners | Customer Concentration Risk | 218 West 18th Street
Business Acquisition [Line Items]
Concentration risk, percentage	16.00%
SAE | Customer Concentration Risk | 218 West 18th Street
Business Acquisition [Line Items]
Concentration risk, percentage	16.00%
Corporate Joint Venture | 1800 M Street Joint Venture
Business Acquisition [Line Items]
Ownership percentage		55.00%
Corporate Joint Venture | 114 Fifth Avenue Joint Venture
Business Acquisition [Line Items]
Ownership percentage		49.50%
Percentage of buildings leased				100.00%

Real Estate Transactions (Purch

Real Estate Transactions (Purchase Price Allocation) (Details) - USD ($) $ in Thousands	Nov. 28, 2017	Oct. 11, 2017
149 Madison Avenue
Business Acquisition [Line Items]
Land	$ 59,112
Building and improvements	28,989
Intangible below market lease liability	0
Total purchase price	88,101
245 - 249 West 17th Street
Business Acquisition [Line Items]
Land		$ 113,149
Building and improvements		194,109
Intangible below market lease liability		(7,131)
Total purchase price		340,597
218 West 18th Street
Business Acquisition [Line Items]
Land		43,836
Building and improvements		126,957
Intangible below market lease liability		(11,757)
Total purchase price		175,324
Intangible lease assets | 149 Madison Avenue
Business Acquisition [Line Items]
Intangible lease	0
Intangible lease assets | 245 - 249 West 17th Street
Business Acquisition [Line Items]
Intangible lease		27,408
Intangible lease assets | 218 West 18th Street
Business Acquisition [Line Items]
Intangible lease		12,120
Intangible lease origination costs | 149 Madison Avenue
Business Acquisition [Line Items]
Intangible lease	$ 0
Intangible lease origination costs | 245 - 249 West 17th Street
Business Acquisition [Line Items]
Intangible lease		13,062
Intangible lease origination costs | 218 West 18th Street
Business Acquisition [Line Items]
Intangible lease		$ 4,168

Real Estate Transactions (Pro F

Real Estate Transactions (Pro Forma) (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)$ / shares
Real Estate [Abstract]
Revenues | $	$ 91,784
Net income | $	$ 77,049
Net income per share – basic (in dollars per share) | $ / shares	$ 0.63
Net income per share – diluted (in dollars per share) | $ / shares	$ 0.63

Real Estate Transactions (Prope

Real Estate Transactions (Properties Sold) (Details) - Disposed of by Sale - USD ($) $ in Thousands	Feb. 01, 2018	Jul. 06, 2017	Jan. 31, 2017	Jan. 06, 2017
University Circle & 333 Market Street
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
% Sold	22.50%	22.50%
Sales Price	$ 235,300	$ 234,000
Gain (Loss) on Sale	$ 762	$ 102,400
Key Center Tower & Marriott
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
% Sold			100.00%
Sales Price			$ 267,500
Gain (Loss) on Sale			$ 9,500
Houston Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
% Sold				100.00%
Sales Price				$ 272,000
Gain (Loss) on Sale				$ 63,700

Real Estate Transactions (Dispo

Real Estate Transactions (Dispositions) (Details) - USD ($)	Feb. 01, 2018	Jul. 06, 2017	Jan. 31, 2017	Jan. 06, 2017	Jan. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from sale of investments in unconsolidated joint ventures						$ 235,083,000	$ 0
Gain on sale of unconsolidated joint venture interests						762,000	$ 0
Disposed of by Sale | University Circle & 333 Market Street
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
% Sold	22.50%	22.50%
Disposed of by Sale | Key Center Tower & Marriott
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
% Sold			100.00%		100.00%
Gross proceeds from sale of real estate			$ 254,500,000
Accruing note receivable as a result of the disposal			$ 13,000,000		$ 13,000,000
Term of accruing note receivable as a result of the disposal			10 years
Deferred gain on disposal			$ 13,000,000		13,000,000
Gain on sale			$ 22,500,000
Loss from disposal group					$ 1,900,000
Disposed of by Sale | Houston Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
% Sold				100.00%
Loss from disposal group				$ 14,900
Bonds Payable | $300 Million Bridge Loan
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Bridge loan						$ 300,000,000
Corporate Joint Venture | San Francisco Joint Ventures
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from sale of investments in unconsolidated joint ventures	$ 235,300,000
Gain on sale of unconsolidated joint venture interests	$ 800,000
Ownership percentage	55.00%
Allianz | Corporate Joint Venture | San Francisco Joint Ventures
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from sale of investments in unconsolidated joint ventures		$ 234,000,000

Unconsolidated Joint Ventures46

Unconsolidated Joint Ventures (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Feb. 01, 2018	Jan. 01, 2018	Dec. 31, 2017	Oct. 11, 2017	Jul. 06, 2017	Mar. 31, 2017
Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Carrying Value of Investment	$ 1,058,441			$ 943,242
Corporate Joint Venture | Market Square Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership Interest	51.00%
Carrying Value of Investment	$ 134,609			128,411
Corporate Joint Venture | University Circle Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership Interest	55.00%
Carrying Value of Investment	$ 298,852			173,798
Corporate Joint Venture | 333 Market Street Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership Interest	55.00%
Carrying Value of Investment	$ 276,869			288,236
Corporate Joint Venture | 114 Fifth Avenue Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership Interest	49.50%
Carrying Value of Investment	$ 106,937			110,311
Corporate Joint Venture | 1800 M Street Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership Interest	55.00%
Carrying Value of Investment	$ 241,174			$ 242,486
Corporate Joint Venture | 114 Fifth Avenue Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership Interest						49.50%
Corporate Joint Venture | 1800 M Street Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership Interest					55.00%
Corporate Joint Venture | San Francisco Joint Ventures
Schedule of Equity Method Investments [Line Items]
Ownership Interest		55.00%
Corporate Joint Venture | Allianz | 114 Fifth Avenue Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership Interest						49.50%
Corporate Joint Venture | Allianz | San Francisco Joint Ventures
Schedule of Equity Method Investments [Line Items]
Additional ownership percentage acquired		22.50%
ASU 2017-05
Schedule of Equity Method Investments [Line Items]
Cumulative-effect adjustment for the adoption of ASU	$ 357,755		$ 357,800				$ 0

Unconsolidated Joint Ventures47

Unconsolidated Joint Ventures (Narrative) (Details) $ in Millions	Mar. 31, 2018USD ($)joint_venture	Dec. 31, 2017USD ($)
Related Party Transaction [Line Items]
Number of joint ventures that qualify as variable interest entities | joint_venture	0
Corporate Joint Venture | Blackstone Property Partners
Related Party Transaction [Line Items]
Mortgage note transferred to joint venture	$ 325	$ 325
Mortgage note interest rate	5.07%	5.07%
Guaranty liability	$ 11.2	$ 11.2

Unconsolidated Joint Ventures48

Unconsolidated Joint Ventures (Condensed Balance Sheet Information for Joint Ventures) (Details) - Corporate Joint Venture - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Total assets	$ 2,036,790	$ 2,054,230
Total debt	324,721	324,708
Total equity	1,433,359	1,443,406
Market Square Joint Venture
Schedule of Equity Method Investments [Line Items]
Total assets	585,274	590,115
Total debt	324,721	324,708
Total equity	244,516	244,506
University Circle Joint Venture
Schedule of Equity Method Investments [Line Items]
Total assets	230,103	227,368
Total debt	0	0
Total equity	222,159	221,154
333 Market Street Joint Venture
Schedule of Equity Method Investments [Line Items]
Total assets	382,462	385,297
Total debt	0	0
Total equity	366,601	368,994
114 Fifth Avenue Joint Venture
Schedule of Equity Method Investments [Line Items]
Total assets	384,478	392,486
Total debt	0	0
Total equity	164,113	170,525
1800 M Street Joint Venture
Schedule of Equity Method Investments [Line Items]
Total assets	454,473	458,964
Total debt	0	0
Total equity	435,970	438,227
Market Square, University Circle, 333 Market Street, 114 Fifth Avenue And 1800 M Street Joint Ventures
Schedule of Equity Method Investments [Line Items]
Aggregate basis difference	$ 285,200	$ 32,000

Unconsolidated Joint Ventures49

Unconsolidated Joint Ventures (Condensed Income Statement Information for the Joint Ventures) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Schedule of Equity Method Investments [Line Items]
Columbia Property Trust's Share of Net Income (Loss)	$ 1,771	$ (1,885)
Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Total Revenues	47,221	10,134
Net Income (Loss)	3,965	(3,696)
Columbia Property Trust's Share of Net Income (Loss)	3,101	(1,885)
Corporate Joint Venture | Market Square Joint Venture
Schedule of Equity Method Investments [Line Items]
Total Revenues	11,015	10,134
Net Income (Loss)	(3,009)	(3,696)
Columbia Property Trust's Share of Net Income (Loss)	(1,534)	(1,885)
Corporate Joint Venture | University Circle Joint Venture
Schedule of Equity Method Investments [Line Items]
Total Revenues	10,341	0
Net Income (Loss)	5,505	0
Columbia Property Trust's Share of Net Income (Loss)	3,429	0
Corporate Joint Venture | 333 Market Street Joint Venture
Schedule of Equity Method Investments [Line Items]
Total Revenues	6,668	0
Net Income (Loss)	3,557	0
Columbia Property Trust's Share of Net Income (Loss)	2,227	0
Corporate Joint Venture | 114 Fifth Avenue Joint Venture
Schedule of Equity Method Investments [Line Items]
Total Revenues	10,300	0
Net Income (Loss)	(2,331)	0
Columbia Property Trust's Share of Net Income (Loss)	(1,154)	0
Corporate Joint Venture | 1800 M Street Joint Venture
Schedule of Equity Method Investments [Line Items]
Total Revenues	8,897	0
Net Income (Loss)	243	0
Columbia Property Trust's Share of Net Income (Loss)	$ 133	$ 0

Unconsolidated Joint Ventures50

Unconsolidated Joint Ventures (Property and Asset Management Fees) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Asset and property management fee income	$ 1,759	$ 474
Other property income | Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Reimbursement revenue	1,000	200
Prepaid expenses and other assets | Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Property management fee receivable	400		$ 400
Market Square Joint Venture | Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Asset and property management fee income	523	474
University Circle Joint Venture | Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Asset and property management fee income	529	0
333 Market Street Joint Venture | Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Asset and property management fee income	197	0
1800 M Street Joint Venture | Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Asset and property management fee income	$ 510	$ 0

Line of Credit and Notes Paya51

Line of Credit and Notes Payable (Schedule of Long-Term Debt (excluding Bonds Payable)) (Details) - USD ($)	3 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Debt Instrument [Line Items]
Lines of credit and notes payable, net		$ 832,722,000		$ 971,185,000
Less: Deferred financing costs related to term loans and notes payable, net of accumulated amortization		(2,641,000)		(2,991,000)
Gain on extinguishment of debt		0	$ (45,000)
Property operating costs		23,062,000	$ 24,105,000
Term Loans
Debt Instrument [Line Items]
Less: Deferred financing costs related to term loans and notes payable, net of accumulated amortization		(2,641,000)		(2,991,000)
Term Loans | $300 Million Term Loan
Debt Instrument [Line Items]
Lines of credit and notes payable, net		300,000,000		300,000,000
Face amount of issued debt instrument		300,000,000		300,000,000
Term Loans | $300 Million Bridge Loan
Debt Instrument [Line Items]
Face amount of issued debt instrument		300,000,000		300,000,000
Term Loans | $150 Million Term Loan
Debt Instrument [Line Items]
Lines of credit and notes payable, net		150,000,000		150,000,000
Face amount of issued debt instrument		150,000,000		150,000,000
Bridge Loan | $300 Million Bridge Loan
Debt Instrument [Line Items]
Lines of credit and notes payable, net		180,000,000		300,000,000
Face amount of issued debt instrument		300,000,000
Credit Facilities | Revolving Credit Facility
Debt Instrument [Line Items]
Lines of credit and notes payable, net		134,000,000		152,000,000
Mortgage Notes | 263 Shuman Boulevard building mortgage note
Debt Instrument [Line Items]
Lines of credit and notes payable, net		49,000,000		49,000,000
Interest expense		$ 1,300,000
Default interest rate		10.55%
Property operating costs		$ 600,000
Mortgage Notes | One Glenlake mortgage note
Debt Instrument [Line Items]
Lines of credit and notes payable, net		$ 22,363,000		$ 23,176,000
Forecast | Mortgage Notes | 263 Shuman Boulevard building mortgage note
Debt Instrument [Line Items]
Gain on extinguishment of debt	$ 24,000,000

Line of Credit and Notes Paya52

Line of Credit and Notes Payable (Narrative) (Details) - USD ($)	Feb. 02, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Loans Payable
Debt Instrument [Line Items]
Estimated fair value of line of credit and notes payable		$ 835,900,000		$ 975,300,000
Carrying value of the line of credit and notes payable		835,400,000		974,200,000
Interest payments		6,300,000	$ 6,200,000
Interest capitalized		900,000	$ 100,000
Term Loans | $300 Million Term Loan
Debt Instrument [Line Items]
Face amount of issued debt instrument		300,000,000		300,000,000
Term Loans | $300 Million Bridge Loan
Debt Instrument [Line Items]
Face amount of issued debt instrument		300,000,000		$ 300,000,000
Bridge Loan | $300 Million Bridge Loan
Debt Instrument [Line Items]
Face amount of issued debt instrument		$ 300,000,000
Repayment of debt	$ 120,000,000

Bonds Payable (Details)

Bonds Payable (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2018USD ($)bond_series	Mar. 31, 2017USD ($)	Dec. 31, 2017USD ($)bond_series
Debt Instrument [Line Items]
Number of series of bonds | bond_series	2		2
Bonds payable, net	$ 693,954,000		$ 693,756,000
Bonds Payable | 2026 Bonds Payable
Debt Instrument [Line Items]
Face amount of issued debt instrument	$ 350,000,000
Maturity of debt instrument	10 years
Interest rate for debt instrument (percent)	3.65%
Discount rate of face value of issued debt instrument (percent)	99.626%
Interest payments	$ 6,400,000	$ 6,500,000
Bonds Payable | 2025 Bonds Payable
Debt Instrument [Line Items]
Face amount of issued debt instrument			$ 350,000,000
Maturity of debt instrument			10 years
Interest rate for debt instrument (percent)			4.15%
Discount rate of face value of issued debt instrument (percent)			99.859%
Bonds Payable | 2026 and 2025 Bonds Payable | Level 2
Debt Instrument [Line Items]
Estimated fair value of debt instrument	702,800,000		$ 702,800,000
Bonds payable, net	$ 698,600,000		$ 698,500,000

Commitments and Contingencies (

Commitments and Contingencies (Details)	Mar. 31, 2018USD ($)Tenant	Oct. 31, 2015USD ($)
Loss Contingencies [Line Items]
Number of tenants that have exercised the option to expand property | Tenant	0
Market Square Joint Venture | Corporate Joint Venture
Loss Contingencies [Line Items]
Guaranty liability | $	$ 11,200,000	$ 25,000,000

Stockholders' Equity (Narrative

Stockholders' Equity (Narrative) (Details) - USD ($)	Jan. 01, 2018	Jan. 20, 2017	Mar. 31, 2018	Dec. 31, 2016	Dec. 31, 2017	Sep. 04, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, par value (dollars per share)			$ 0.01		$ 0.01
Value of stock repurchased			$ 27,286,000
Granted (shares)			375,000
Unrecognized compensation costs related to unvested awards			$ 12,300,000		$ 8,100,000
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			4,800,000
Long Term Incentive Plan | January 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights (percent)		25.00%
Long Term Incentive Plan | January 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights (percent)		25.00%
Long Term Incentive Plan | January 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights (percent)		25.00%
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares repurchased (in shares)			1,295,000
Value of stock repurchased			$ 13,000
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
Number of shares repurchased (in shares)			1,300,000
Shares repurchased, average cost per share (dollars per share)			$ 21.03
Value of stock repurchased			$ 27,300,000
Stock repurchase program, amount available for repurchase			$ 167,600,000
Time-based Stock Awards | Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)	128,486
Vesting period	4 years
RSUs | Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)	176,702
Performance period	3 years			1 year
RSUs | Long Term Incentive Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payout percentage			50.00%
RSUs | Long Term Incentive Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payout percentage			150.00%
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 | January 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights (percent)	25.00%

Stockholders' Equity (Unvested

Stockholders' Equity (Unvested Activity Rollforward) (Details)	3 Months Ended
	Mar. 31, 2018$ / sharesshares
Shares Rollforward
Unvested shares - beginning of period (shares)	718,000
Granted (shares)	375,000
Vested (shares)	(275,000)
Forfeited (shares)	(11,000)
Unvested shares - end of period (shares)	807,000
Weighted-Average, Grant-Date Fair Value Rollforward
Unvested shares - beginning of period (dollars per share) | $ / shares	$ 20.45
Granted (dollars per share) | $ / shares	17.50
Vested (dollars per share) | $ / shares	16
Forfeited (dollars per share) | $ / shares	18.60
Unvested shares - end of period (dollars per share) | $ / shares	$ 20.62
Shares expected to ultimately vest	776,000
Expected forfeiture rate	3.80%

Stockholders' Equity (Summary o

Stockholders' Equity (Summary of Shares Granted to Independent Directors) (Details) - $ / shares	Jan. 03, 2017	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares		375,000
Grant-Date Fair Value (dollars per share)		$ 17.50
Director | January 3, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares	8,279
Grant-Date Fair Value (dollars per share)	$ 21.58

Stockholders' Equity (Stock-bas

Stockholders' Equity (Stock-based Compensation Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 1,528	$ 1,691
Future employee awards	492	595
Employees
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	1,036	917
Director
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 0	$ 179

Supplemental Disclosures of N59

Supplemental Disclosures of Noncash Investing and Financing Activities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deposits applied to sales of real estate	$ 0	$ 10,000
Amortization of net discounts on debt	45	45
Accrued capital expenditures and deferred lease costs	12,414	12,534
Market value adjustments to interest rate swaps that qualify for hedge accounting treatment	2,514	634
Common stock issued to employees and directors, and amortized (net of income tax withholdings)	(443)	235
ASU 2017-05
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment for the adoption of ASU 2017-05	$ 357,755	$ 0	$ 357,800

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, 2018	Mar. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 1,498	$ 74,722
Distributions paid on unvested shares	(73)	(84)
Net income used to calculate basic and diluted earnings per share	$ 1,425	$ 74,638
Weighted-average common shares – basic	119,082	122,003
Weighted-average common shares – diluted	119,350	122,329
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 share repurchases	70	64
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 share repurchases	198	262

Revenues (Details)

Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018
Disaggregation of Revenue [Line Items]
Lease termination revenue	$ 400	$ 300
Asset and property management fee income	1,759	474
Salary and other reimbursement revenue	$ 1,000	$ 200
Difference between Revenue Guidance in Effect before and after Topic 606 | ASU 2014-09
Disaggregation of Revenue [Line Items]
Lease override fees receivable			$ 300
Retained earnings			$ 300

Segment Information (Operating

Segment Information (Operating Revenues by Geographic Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 31, 2018	Jul. 05, 2017
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	$ 98,166	$ 86,850
Operating revenues	73,710	82,156
Asset and property management fee income	(1,759)	(474)
Operating Segments
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	97,485	85,752
Operating Segments | New York
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	40,909	27,586
Operating Segments | San Francisco
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	23,520	27,182
Operating Segments | Atlanta
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	9,858	9,328
Operating Segments | Washington, D.C.
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	13,972	7,383
Operating Segments | Boston
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	3,370	2,904
Operating Segments | Los Angeles
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	1,920	1,778
Operating Segments | All other office markets
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	3,936	9,591
Hotel
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	0	1,218
Asset and property management fee income	(1,759)	(474)
Corporate
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	681	(120)
Eliminations
Segment Reporting Information [Line Items]
Operating revenues	26,215	5,168
Asset and property management fee income	$ (1,759)	(474)
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%		77.50%	100.00%
Market Square Joint Venture | Corporate Joint Venture
Segment Reporting Information [Line Items]
Ownership percentage	51.00%
Asset and property management fee income	$ (523)	(474)
1800 M Street Joint Venture | Corporate Joint Venture
Segment Reporting Information [Line Items]
Ownership percentage	55.00%
Asset and property management fee income	$ (510)	$ 0

Segment Information (Net Operat

Segment Information (Net Operating Income By Geographic Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 31, 2018	Jul. 05, 2017
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	$ 66,859	$ 57,576
Operating Segments
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	67,084	58,474
Operating Segments | New York
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	24,179	17,616
Operating Segments | San Francisco
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	19,554	19,866
Operating Segments | Atlanta
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	8,754	8,293
Operating Segments | Washington, D.C.
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	8,330	3,278
Operating Segments | Boston
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	1,768	1,409
Operating Segments | Los Angeles
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	1,208	1,082
Operating Segments | All other office markets
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	3,291	6,930
Hotel
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	0	(876)
Corporate
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	$ (225)	$ (22)
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%		77.50%	100.00%
Market Square Joint Venture | Corporate Joint Venture
Segment Reporting Information [Line Items]
Ownership percentage	51.00%

Segment Information (Reconcilia

Segment Information (Reconciliation of GAAP Net Income to NOI) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Net income	$ 1,498	$ 74,722
Depreciation	20,835	21,605
Amortization	8,016	9,457
General and administrative – corporate	7,794	8,768
General and administrative – unconsolidated joint ventures	731	0
Gain on sale of unconsolidated joint venture interests	(762)	0
Income tax expense (benefit)	7	(388)
Asset and property management fee income	(1,759)	(474)
Gain on sales of real estate assets	0	(73,153)
NOI	66,859	57,576
Segment Reconciling Items
Segment Reporting Information [Line Items]
Depreciation	20,835	21,605
Amortization	8,016	9,457
General and administrative – corporate	7,794	8,768
General and administrative – unconsolidated joint ventures	731	0
Net interest expense	15,892	14,565
Interest income from development authority bonds	(1,800)	(1,800)
Gain on sale of unconsolidated joint venture interests	(762)	0
Loss on early extinguishment of debt	0	45
Income tax expense (benefit)	7	(388)
Asset and property management fee income	(1,759)	(474)
Adjustments included in income (loss) from unconsolidated joint ventures	16,407	4,229
Gain on sales of real estate assets	$ 0	$ (73,153)

Financial Information for Par65

Financial Information for Parent Guarantor, Issuer Subsidiary, and Non-Guarantor Subsidiaries (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Ownership percentage of wholly owned subsidiary	100.00%
Condensed Financial Statements, Captions [Line Items]
Increase in operating cash flows	$ 14,771	$ 5,398
Increase (decrease) in investing cash flows	212,641	470,256
Increase (decrease) in financing cash flows	(215,911)	(137,084)
Reportable Legal Entities | Parent
Condensed Financial Statements, Captions [Line Items]
Increase in operating cash flows	708	64,000
Increase (decrease) in investing cash flows	75,935	350,170
Increase (decrease) in financing cash flows	(77,080)	(67,353)
Reportable Legal Entities | Issuer
Condensed Financial Statements, Captions [Line Items]
Increase in operating cash flows	(5,326)	59,949
Increase (decrease) in investing cash flows	226,530	359,816
Increase (decrease) in financing cash flows	(215,828)	(416,068)
Reportable Legal Entities | Non- Guarantors
Condensed Financial Statements, Captions [Line Items]
Increase in operating cash flows	19,389	16,848
Increase (decrease) in investing cash flows	(23,877)	434,014
Increase (decrease) in financing cash flows	$ 11,050	(462,806)
Intercompany Cash Transfers Between Parent and Subsidiaries Broken Out by Cash Flow Type | Reportable Legal Entities | Restatement Adjustment | Parent
Condensed Financial Statements, Captions [Line Items]
Increase in operating cash flows		63,200
Increase (decrease) in investing cash flows		93,400
Increase (decrease) in financing cash flows		(156,600)
Intercompany Cash Transfers Between Parent and Subsidiaries Broken Out by Cash Flow Type | Reportable Legal Entities | Restatement Adjustment | Issuer
Condensed Financial Statements, Captions [Line Items]
Increase in operating cash flows		72,200
Increase (decrease) in investing cash flows		361,100
Increase (decrease) in financing cash flows		(433,300)
Intercompany Cash Transfers Between Parent and Subsidiaries Broken Out by Cash Flow Type | Reportable Legal Entities | Restatement Adjustment | Non- Guarantors
Condensed Financial Statements, Captions [Line Items]
Increase (decrease) in investing cash flows		219,300
Increase (decrease) in financing cash flows		$ (219,300)

Financial Information for Par66

Financial Information for Parent Guarantor, Issuer Subsidiary, and Non-Guarantor Subsidiaries (Condensed Consolidating Balance Sheets) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Assets:
Land	$ 825,208	$ 825,208
Buildings and improvements, net	2,059,738	2,063,419
Intangible lease assets, net	194,233	199,260
Construction in progress	46,814	44,742
Total real estate assets	3,125,993	3,132,629
Investments in unconsolidated joint ventures	1,058,441	943,242
Cash and cash equivalents	21,068	9,567	$ 554,655	$ 216,085
Investment in subsidiaries	0	0
Tenant receivables, net of allowance	2,435	2,128
Straight-line rent receivable	102,415	92,235
Prepaid expenses and other assets	25,189	27,683
Intangible lease origination costs, net	40,540	42,959
Deferred lease costs, net	142,719	141,096
Investment in development authority bonds	120,000	120,000
Total assets	4,638,800	4,511,539
Liabilities:
Lines of credit and notes payable, net	832,722	971,185
Bonds payable, net	693,954	693,756
Accounts payable, accrued expenses, and accrued capital expenditures	105,772	125,002
Dividends payable	0	23,961
Due to affiliates	0	0
Deferred income	18,264	18,481
Intangible lease liabilities, net	25,629	27,218
Obligations under capital lease	120,000	120,000
Total liabilities	1,796,341	1,979,603
Equity:
Total equity	2,842,459	2,531,936	2,553,869	2,502,768
Total liabilities and equity	4,638,800	4,511,539
Reportable Legal Entities | Columbia Property Trust (Parent) (Guarantor)
Assets:
Land	0	0
Buildings and improvements, net	0	0
Intangible lease assets, net	0	0
Construction in progress	0	0
Total real estate assets	0	0
Investments in unconsolidated joint ventures	0	0
Cash and cash equivalents	255	692	521,237	174,420
Investment in subsidiaries	2,525,277	2,238,577
Tenant receivables, net of allowance	0	0
Straight-line rent receivable	0	0
Prepaid expenses and other assets	317,702	317,364
Intangible lease origination costs, net	0	0
Deferred lease costs, net	0	0
Investment in development authority bonds	0	0
Total assets	2,843,234	2,556,633
Liabilities:
Lines of credit and notes payable, net	0	0
Bonds payable, net	0	0
Accounts payable, accrued expenses, and accrued capital expenditures	775	732
Dividends payable		23,961
Due to affiliates	0	0
Deferred income	0	4
Intangible lease liabilities, net	0	0
Obligations under capital lease	0	0
Total liabilities	775	24,697
Equity:
Total equity	2,842,459	2,531,936
Total liabilities and equity	2,843,234	2,556,633
Reportable Legal Entities | Columbia Property Trust OP (the Issuer)
Assets:
Land	0	0
Buildings and improvements, net	2,006	2,110
Intangible lease assets, net	0	0
Construction in progress	0	0
Total real estate assets	2,006	2,110
Investments in unconsolidated joint ventures	1,058,441	943,241
Cash and cash equivalents	10,455	5,079	20,206	16,509
Investment in subsidiaries	1,339,612	1,186,594
Tenant receivables, net of allowance	30	30
Straight-line rent receivable	0	0
Prepaid expenses and other assets	338,633	336,598
Intangible lease origination costs, net	0	0
Deferred lease costs, net	0	0
Investment in development authority bonds	0	0
Total assets	2,749,177	2,473,652
Liabilities:
Lines of credit and notes payable, net	761,479	899,168
Bonds payable, net	693,954	693,756
Accounts payable, accrued expenses, and accrued capital expenditures	10,032	10,325
Dividends payable		0
Due to affiliates	0	0
Deferred income	81	81
Intangible lease liabilities, net	0	0
Obligations under capital lease	0	0
Total liabilities	1,465,546	1,603,330
Equity:
Total equity	1,283,631	870,322
Total liabilities and equity	2,749,177	2,473,652
Reportable Legal Entities | Non- Guarantors
Assets:
Land	825,208	825,208
Buildings and improvements, net	2,057,732	2,061,309
Intangible lease assets, net	194,233	199,260
Construction in progress	46,814	44,742
Total real estate assets	3,123,987	3,130,519
Investments in unconsolidated joint ventures	0	1
Cash and cash equivalents	10,358	3,796	13,212	25,156
Investment in subsidiaries	0	0
Tenant receivables, net of allowance	2,405	2,098
Straight-line rent receivable	102,415	92,235
Prepaid expenses and other assets	14,508	19,375
Intangible lease origination costs, net	40,540	42,959
Deferred lease costs, net	142,719	141,096
Investment in development authority bonds	120,000	120,000
Total assets	3,556,932	3,552,079
Liabilities:
Lines of credit and notes payable, net	714,553	715,327
Bonds payable, net	0	0
Accounts payable, accrued expenses, and accrued capital expenditures	94,971	113,949
Dividends payable		0
Due to affiliates	2,338	2,340
Deferred income	18,183	18,396
Intangible lease liabilities, net	25,629	27,218
Obligations under capital lease	120,000	120,000
Total liabilities	975,674	997,230
Equity:
Total equity	2,581,258	2,554,849
Total liabilities and equity	3,556,932	3,552,079
Consolidating Adjustments
Assets:
Land	0	0
Buildings and improvements, net	0	0
Intangible lease assets, net	0	0
Construction in progress	0	0
Total real estate assets	0	0
Investments in unconsolidated joint ventures	0	0
Cash and cash equivalents	0	0	$ 0	$ 0
Investment in subsidiaries	(3,864,889)	(3,425,171)
Tenant receivables, net of allowance	0	0
Straight-line rent receivable	0	0
Prepaid expenses and other assets	(645,654)	(645,654)
Intangible lease origination costs, net	0	0
Deferred lease costs, net	0	0
Investment in development authority bonds	0	0
Total assets	(4,510,543)	(4,070,825)
Liabilities:
Lines of credit and notes payable, net	(643,310)	(643,310)
Bonds payable, net	0	0
Accounts payable, accrued expenses, and accrued capital expenditures	(6)	(4)
Dividends payable		0
Due to affiliates	(2,338)	(2,340)
Deferred income	0	0
Intangible lease liabilities, net	0	0
Obligations under capital lease	0	0
Total liabilities	(645,654)	(645,654)
Equity:
Total equity	(3,864,889)	(3,425,171)
Total liabilities and equity	$ (4,510,543)	$ (4,070,825)

Financial Information for Par67

Financial Information for Parent Guarantor, Issuer Subsidiary, and Non-Guarantor Subsidiaries (Consolidating Statements of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues:
Rental income	$ 64,817	$ 71,173
Tenant reimbursements	5,543	8,584
Hotel income	0	1,339
Asset and property management fee income	1,759	474
Other property income	1,591	586
Revenues	73,710	82,156
Expenses:
Property operating costs	23,062	24,105
Hotel operating costs	0	2,076
Asset and property management fees:
Related-party		0
Other	208	269
Depreciation	20,835	21,605
Amortization	8,016	9,457
General and administrative – corporate	7,794	8,768
General and administrative – unconsolidated joint ventures	731	0
Costs and expenses	60,646	66,280
Real estate operating income	13,064	15,876
Other Income (Expense):
Interest expense	(15,895)	(15,115)
Interest and other income	1,803	2,350
Gain on sale of unconsolidated joint venture interests	762	0
Loss on early extinguishment of debt	0	(45)
Nonoperating income (expense)	(13,330)	(12,810)
Income (loss) before income taxes, unconsolidated joint ventures, and sales of real estate	(266)	3,066
Income tax benefit (expense)	(7)	388
Income (loss) from unconsolidated joint ventures	1,771	(1,885)
Income before sales of real estate	1,498	1,569
Gain on sales of real estate assets	0	73,153
Net income	1,498	74,722
Reportable Legal Entities | Columbia Property Trust (Parent) (Guarantor)
Revenues:
Rental income	0	0
Tenant reimbursements	0	0
Hotel income		0
Asset and property management fee income	905	245
Other property income	0	0
Revenues	905	245
Expenses:
Property operating costs	0	0
Hotel operating costs		0
Asset and property management fees:
Related-party		0
Other	0	0
Depreciation	0	0
Amortization	0	0
General and administrative – corporate	198	39
General and administrative – unconsolidated joint ventures	0
Costs and expenses	198	39
Real estate operating income	707	206
Other Income (Expense):
Interest expense	0	0
Interest and other income	3,555	4,101
Gain on sale of unconsolidated joint venture interests	0
Loss on early extinguishment of debt		0
Nonoperating income (expense)	3,555	4,101
Income (loss) before income taxes, unconsolidated joint ventures, and sales of real estate	4,262	4,307
Income tax benefit (expense)	0	0
Income (loss) from unconsolidated joint ventures	(2,764)	70,415
Income before sales of real estate		74,722
Gain on sales of real estate assets		0
Net income	1,498	74,722
Reportable Legal Entities | Columbia Property Trust OP (the Issuer)
Revenues:
Rental income	0	51
Tenant reimbursements	0	34
Hotel income		0
Asset and property management fee income	0	0
Other property income	0	0
Revenues	0	85
Expenses:
Property operating costs	0	172
Hotel operating costs		0
Asset and property management fees:
Related-party		3
Other	0	0
Depreciation	167	82
Amortization	0	5
General and administrative – corporate	2,309	2,518
General and administrative – unconsolidated joint ventures	0
Costs and expenses	2,476	2,780
Real estate operating income	(2,476)	(2,695)
Other Income (Expense):
Interest expense	(12,434)	(10,284)
Interest and other income	3,478	2,078
Gain on sale of unconsolidated joint venture interests	762
Loss on early extinguishment of debt		0
Nonoperating income (expense)	(8,194)	(8,206)
Income (loss) before income taxes, unconsolidated joint ventures, and sales of real estate	(10,670)	(10,901)
Income tax benefit (expense)	0	0
Income (loss) from unconsolidated joint ventures	9,194	63,099
Income before sales of real estate		52,198
Gain on sales of real estate assets		11,050
Net income	(1,476)	63,248
Reportable Legal Entities | Non- Guarantors
Revenues:
Rental income	64,817	71,221
Tenant reimbursements	5,543	8,550
Hotel income		1,339
Asset and property management fee income	854	229
Other property income	1,591	604
Revenues	72,805	81,943
Expenses:
Property operating costs	23,062	24,032
Hotel operating costs		2,076
Asset and property management fees:
Related-party		0
Other	208	269
Depreciation	20,668	21,523
Amortization	8,016	9,452
General and administrative – corporate	5,287	6,226
General and administrative – unconsolidated joint ventures	731
Costs and expenses	57,972	63,578
Real estate operating income	14,833	18,365
Other Income (Expense):
Interest expense	(10,494)	(10,463)
Interest and other income	1,803	1,803
Gain on sale of unconsolidated joint venture interests	0
Loss on early extinguishment of debt		(45)
Nonoperating income (expense)	(8,691)	(8,705)
Income (loss) before income taxes, unconsolidated joint ventures, and sales of real estate	6,142	9,660
Income tax benefit (expense)	(7)	388
Income (loss) from unconsolidated joint ventures	0	0
Income before sales of real estate		10,048
Gain on sales of real estate assets		62,103
Net income	6,135	72,151
Consolidating Adjustments
Revenues:
Rental income	0	(99)
Tenant reimbursements	0	0
Hotel income		0
Asset and property management fee income	0	0
Other property income	0	(18)
Revenues	0	(117)
Expenses:
Property operating costs	0	(99)
Hotel operating costs		0
Asset and property management fees:
Related-party		(3)
Other	0	0
Depreciation	0	0
Amortization	0	0
General and administrative – corporate	0	(15)
General and administrative – unconsolidated joint ventures	0
Costs and expenses	0	(117)
Real estate operating income	0	0
Other Income (Expense):
Interest expense	7,033	5,632
Interest and other income	(7,033)	(5,632)
Gain on sale of unconsolidated joint venture interests	0
Loss on early extinguishment of debt		0
Nonoperating income (expense)	0	0
Income (loss) before income taxes, unconsolidated joint ventures, and sales of real estate	0	0
Income tax benefit (expense)	0	0
Income (loss) from unconsolidated joint ventures	(4,659)	(135,399)
Income before sales of real estate		(135,399)
Gain on sales of real estate assets		0
Net income	$ (4,659)	$ (135,399)

Financial Information for Par68

Financial Information for Parent Guarantor, Issuer Subsidiary, and Non-Guarantor Subsidiaries (Consolidating Statements of Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Net income	$ 1,498	$ 74,722
Market value adjustment to interest rate swap	2,514	634
Comprehensive income	4,012	75,356
Reportable Legal Entities | Columbia Property Trust (Parent) (Guarantor)
Condensed Financial Statements, Captions [Line Items]
Net income	1,498	74,722
Market value adjustment to interest rate swap	2,514	634
Comprehensive income	4,012	75,356
Reportable Legal Entities | Columbia Property Trust OP (the Issuer)
Condensed Financial Statements, Captions [Line Items]
Net income	(1,476)	63,248
Market value adjustment to interest rate swap	2,514	634
Comprehensive income	1,038	63,882
Reportable Legal Entities | Non- Guarantors
Condensed Financial Statements, Captions [Line Items]
Net income	6,135	72,151
Market value adjustment to interest rate swap	0	0
Comprehensive income	6,135	72,151
Consolidating Adjustments
Condensed Financial Statements, Captions [Line Items]
Net income	(4,659)	(135,399)
Market value adjustment to interest rate swap	(2,514)	(634)
Comprehensive income	$ (7,173)	$ (136,033)

Financial Information for Par69

Financial Information for Parent Guarantor, Issuer Subsidiary, and Non-Guarantor Subsidiaries (Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	$ 14,771	$ 5,398
Cash flows from investing activities:
Net proceeds from sale of investments in unconsolidated joint ventures	235,083	0
Net proceeds from the sales of real estate	0	504,660
Investment in real estate and related assets	(23,877)	(33,174)
Investments in unconsolidated joint ventures	(1,541)	(1,230)
Distributions from unconsolidated joint ventures	2,976	0
Distributions from subsidiaries	0	0
Net cash provided by investing activities	212,641	470,256
Cash flows from financing activities:
Borrowings, net of fees	108,983
Repayments	(247,814)	(74,406)
Distributions	(47,819)	(61,217)
Repurchases of common stock	(29,261)	(1,461)
Net cash used in financing activities	(215,911)	(137,084)
Net increase (decrease) in cash and cash equivalents	11,501	338,570
Cash and cash equivalents, beginning of period	9,567	216,085
Cash and cash equivalents, end of period	21,068	554,655
Reportable Legal Entities | Columbia Property Trust (Parent) (Guarantor)
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	708	64,000
Cash flows from investing activities:
Net proceeds from sale of investments in unconsolidated joint ventures	0
Net proceeds from the sales of real estate		0
Investment in real estate and related assets	0	(12,000)
Investments in unconsolidated joint ventures	0	0
Distributions from unconsolidated joint ventures	0
Distributions from subsidiaries	75,935	362,170
Net cash provided by investing activities	75,935	350,170
Cash flows from financing activities:
Borrowings, net of fees	0
Repayments	0	0
Distributions	(47,819)	(65,892)
Repurchases of common stock	(29,261)	(1,461)
Net cash used in financing activities	(77,080)	(67,353)
Net increase (decrease) in cash and cash equivalents	(437)	346,817
Cash and cash equivalents, beginning of period	692	174,420
Cash and cash equivalents, end of period	255	521,237
Increase (decrease) in net proceeds from sales of real estate		(268,800)
Increase (decrease) in distributions from subsidiaries		362,200
Increase (decrease) in distributions		(4,700)
Reportable Legal Entities | Columbia Property Trust OP (the Issuer)
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	(5,326)	59,949
Cash flows from investing activities:
Net proceeds from sale of investments in unconsolidated joint ventures	235,083
Net proceeds from the sales of real estate		49,531
Investment in real estate and related assets	0	(59)
Investments in unconsolidated joint ventures	(1,541)	(1,230)
Distributions from unconsolidated joint ventures	2,976
Distributions from subsidiaries	(9,988)	311,574
Net cash provided by investing activities	226,530	359,816
Cash flows from financing activities:
Borrowings, net of fees	108,983
Repayments	(247,000)	0
Distributions	(77,811)	(416,068)
Repurchases of common stock	0	0
Net cash used in financing activities	(215,828)	(416,068)
Net increase (decrease) in cash and cash equivalents	5,376	3,697
Cash and cash equivalents, beginning of period	5,079	16,509
Cash and cash equivalents, end of period	10,455	20,206
Increase (decrease) in net proceeds from sales of real estate		49,500
Increase (decrease) in distributions from subsidiaries		311,600
Increase (decrease) in distributions		(416,100)
Reportable Legal Entities | Non- Guarantors
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	19,389	16,848
Cash flows from investing activities:
Net proceeds from sale of investments in unconsolidated joint ventures	0
Net proceeds from the sales of real estate		455,129
Investment in real estate and related assets	(23,877)	(21,115)
Investments in unconsolidated joint ventures	0	0
Distributions from unconsolidated joint ventures	0
Distributions from subsidiaries	0	0
Net cash provided by investing activities	(23,877)	434,014
Cash flows from financing activities:
Borrowings, net of fees	0
Repayments	(814)	(74,406)
Distributions	11,864	(388,400)
Repurchases of common stock	0	0
Net cash used in financing activities	11,050	(462,806)
Net increase (decrease) in cash and cash equivalents	6,562	(11,944)
Cash and cash equivalents, beginning of period	3,796	25,156
Cash and cash equivalents, end of period	10,358	13,212
Increase (decrease) in net proceeds from sales of real estate		219,300
Increase (decrease) in distributions		(388,400)
Eliminations
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	0	(135,399)
Cash flows from investing activities:
Net proceeds from sale of investments in unconsolidated joint ventures	0
Net proceeds from the sales of real estate		0
Investment in real estate and related assets	0	0
Investments in unconsolidated joint ventures	0	0
Distributions from unconsolidated joint ventures	0
Distributions from subsidiaries	(65,947)	(673,744)
Net cash provided by investing activities	(65,947)	(673,744)
Cash flows from financing activities:
Borrowings, net of fees	0
Repayments	0	0
Distributions	65,947	809,143
Repurchases of common stock	0	0
Net cash used in financing activities	65,947	809,143
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	$ 0	0
Increase (decrease) in distributions from subsidiaries		(673,800)
Increase (decrease) in distributions		$ 809,200