Columbia Property Trust (CXP) 10-Q 26 Oct 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 23, 2017
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	Sep. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		119,803,608

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Real estate assets, at cost:
Land	$ 609,110	$ 751,351
Buildings and improvements, less accumulated depreciation of $377,794 and $435,457, as of September 30, 2017 and December 31, 2016, respectively	1,704,630	2,121,150
Intangible lease assets, less accumulated amortization of $89,950 and $112,777, as of September 30, 2017 and December 31, 2016, respectively	164,699	193,311
Construction in progress	49,255	36,188
Real estate assets held for sale, less accumulated depreciation and amortization of $180,791, as of December 31, 2016	0	412,506
Total real estate assets	2,527,694	3,514,506
Investment in unconsolidated joint ventures	698,105	127,346
Cash and cash equivalents	382,730	216,085
Tenant receivables, net of allowance for doubtful accounts of $7 and $31, as of September 30, 2017 and December 31, 2016, respectively	2,814	7,163
Straight-line rent receivable	80,128	64,811
Prepaid expenses and other assets	75,802	24,275
Intangible lease origination costs, less accumulated amortization of $55,532 and $74,578, as of September 30, 2017 and December 31, 2016, respectively	28,067	54,279
Deferred lease costs, less accumulated amortization of $24,716 and $22,753, as of September 30, 2017 and December 31, 2016, respectively	127,940	125,799
Investment in development authority bonds	120,000	120,000
Other assets held for sale, less accumulated amortization of $34,152, as of December 31, 2016	0	45,529
Total assets	4,043,280	4,299,793
Liabilities:
Line of credit and notes payable, net of unamortized deferred financing costs of $2,611 and $3,136, as of September 30, 2017 and December 31, 2016, respectively	520,367	721,466
Bonds payable, net of discounts of $1,529 and $1,664 and unamortized deferred financing costs of $4,909 and $5,364, as of September 30, 2017 and December 31, 2016, respectively	693,562	692,972
Accounts payable, accrued expenses, and accrued capital expenditures	129,802	131,028
Dividends payable	0	36,727
Deferred income	15,756	19,694
Intangible lease liabilities, less accumulated amortization of $19,437 and $44,564, as of September 30, 2017 and December 31, 2016, respectively	9,891	33,375
Obligations under capital lease	120,000	120,000
Liabilities held for sale, less accumulated amortization of $1,239, as of December 31, 2016	0	41,763
Total liabilities	1,489,378	1,797,025
Commitments and Contingencies (Note 7)
Equity:
Common stock, $0.01 par value, 225,000,000 shares authorized, 119,803,608 and 122,184,193 shares issued and outstanding, as of September 30, 2017 and December 31, 2016, respectively	1,198	1,221
Additional paid-in capital	4,485,368	4,538,912
Cumulative distributions in excess of earnings	(1,931,927)	(2,036,482)
Cumulative other comprehensive loss	(737)	(883)
Total equity	2,553,902	2,502,768
Total liabilities and equity	$ 4,043,280	$ 4,299,793

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Building and improvements, accumulated depreciation	$ 377,794	$ 435,457
Intangible lease assets, accumulated amortization	89,950	112,777
Real estate assets held for sale, accumulated amortization		180,791
Allowance for doubtful accounts	7	31
Intangible lease origination costs, accumulated amortization	55,532	74,578
Deferred lease costs, accumulated amortization	24,716	22,753
Other assets held for sale, accumulated amortization		34,152
Deferred financing costs, net	2,611	3,136
Bonds payable discount	1,529	1,664
Intangible lease liabilities, accumulated amortization	$ 19,437	44,564
Liabilities held for sale, accumulated amortization		$ 1,239
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	119,803,608	122,184,193
Common stock, shares outstanding	119,803,608	122,184,193
Term Loans
Deferred financing costs, net	$ 2,611	$ 3,136
Bonds Payable
Deferred financing costs, net	$ 4,909	$ 5,364

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues:
Rental income	$ 55,015	$ 87,561	$ 193,309	$ 280,714
Tenant reimbursements	3,053	17,090	18,609	55,551
Hotel income	0	6,270	1,339	17,484
Asset and property management fee income	1,154	511	2,126	1,655
Other property income	1,140	1,834	1,992	12,371
Revenues	60,362	113,266	217,375	367,775
Expenses:
Property operating costs	18,567	39,101	64,503	120,679
Hotel operating costs	0	4,946	2,085	14,315
Asset and property management fee expenses	188	387	717	1,058
Depreciation	18,501	26,778	60,529	84,517
Amortization	6,870	11,895	24,518	42,902
General and administrative - corporate	7,034	7,467	25,003	25,718
General and administrative - unconsolidated joint ventures	713	0	713	0
Costs and expenses	51,873	90,574	178,068	289,189
Real estate operating income	8,489	22,692	39,307	78,586
Other income (expense):
Interest expense	(14,731)	(17,138)	(44,308)	(52,415)
Interest and other income	2,841	1,839	7,668	5,452
Loss on early extinguishment of debt	(280)	(18,905)	(325)	(18,997)
Nonoperating income (expense)	(12,170)	(34,204)	(36,965)	(65,960)
Income (loss) before income taxes, unconsolidated joint ventures, and sales of real estate:	(3,681)	(11,512)	2,342	12,626
Income tax benefit (expense)	(3)	(65)	378	(387)
Income (loss) from unconsolidated joint ventures	2,853	(1,937)	(849)	(5,441)
Income (loss) before sales of real estate:	(831)	(13,514)	1,871	6,798
Gain on sales of real estate assets	102,365	50,412	175,518	50,083
Net income	$ 101,534	$ 36,898	$ 177,389	$ 56,881
Per-share information – basic:
Net income (dollars per share)	$ 0.84	$ 0.30	$ 1.46	$ 0.46
Weighted-average common shares outstanding – basic	120,293	123,215	121,270	123,271
Per-share information – diluted:
Net income (dollars per share)	$ 0.84	$ 0.30	$ 1.46	$ 0.46
Weighted-average common shares outstanding – diluted	120,529	123,350	121,458	123,348
Dividends per share (dollars per share)	$ 0.20	$ 0.30	$ 0.60	$ 0.90

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 101,534	$ 36,898	$ 177,389	$ 56,881
Market value adjustment to interest rate swap	148	1,250	146	(5,629)
Comprehensive income	$ 101,682	$ 38,148	$ 177,535	$ 51,252

Consolidated Statements of Equi

Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Cumulative Distributions in Excess of Earnings	Cumulative Other Comprehensive Income (Loss)
Beginning balance, shares at Dec. 31, 2015		124,363,000
Beginning balance, value at Dec. 31, 2015	$ 2,614,194	$ 1,243	$ 4,588,303	$ (1,972,916)	$ (2,436)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchases of common stock, shares		(1,105,000)
Repurchases of common stock	(25,000)	$ (11)	(24,989)
Common stock issued to employees and directors, and amortized (net of income tax withholdings), shares		213,000
Common stock issued to employees and directors, and amortized (net of income tax withholdings)	2,339	$ 2	2,337
Distributions to common stockholders ($0.60 in 2017 and $0.90 in 2016)	(111,120)			(111,120)
Net income	56,881			56,881
Market value adjustment to interest rate swap	(5,629)				(5,629)
Ending balance, shares at Sep. 30, 2016		123,471,000
Ending balance, value at Sep. 30, 2016	$ 2,531,665	$ 1,234	4,565,651	(2,027,155)	(8,065)
Beginning balance, shares at Dec. 31, 2016	122,184,193	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]
Repurchases of common stock, shares		(2,682,000)
Repurchases of common stock	(57,628)	$ (26)	(57,602)
Common stock issued to employees and directors, and amortized (net of income tax withholdings), shares		302,000
Common stock issued to employees and directors, and amortized (net of income tax withholdings)	4,061	$ 3	4,058
Distributions to common stockholders ($0.60 in 2017 and $0.90 in 2016)	(72,834)			(72,834)
Net income	177,389			177,389
Market value adjustment to interest rate swap	$ 146				146
Ending balance, shares at Sep. 30, 2017	119,803,608	119,804,000
Ending balance, value at Sep. 30, 2017	$ 2,553,902	$ 1,198	$ 4,485,368	$ (1,931,927)	$ (737)

Consolidated Statements of Equ7

Consolidated Statements of Equity (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Distributions to common stockholders per share (dollars per share)	$ 0.60	$ 0.90
Common Stock
Distributions to common stockholders per share (dollars per share)	$ 0.60	$ 0.90

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash Flows from Operating Activities:
Net income	$ 177,389	$ 56,881
Adjustments to reconcile net income to net cash provided by operating activities:
Straight-line rental income	(20,964)	(15,470)
Depreciation	60,529	84,517
Amortization	24,115	39,271
Noncash interest expense	2,239	2,765
Loss on early extinguishment of debt	325	18,997
Loss from unconsolidated joint ventures	849	5,441
Gain on sales of real estate assets	(175,518)	(50,083)
Stock-based compensation expense	5,509	3,512
Changes in assets and liabilities, net of acquisitions and dispositions:
Decrease in tenant receivables, net	3,957	4,646
Decrease in prepaid expenses and other assets	1,340	5,776
Decrease in accounts payable and accrued expenses	(25,488)	(3,799)
Decrease in deferred income	(7,167)	(2,750)
Net cash provided by operating activities	47,115	149,704
Cash Flows from Investing Activities:
Net proceeds from the sales of real estate	737,631	482,089
Prepaid earnest money	(52,000)	0
Capital improvement and development costs	(59,022)	(34,447)
Deferred lease costs paid	(14,437)	(19,713)
Investments in unconsolidated joint ventures	(123,149)	(12,351)
Distributions from unconsolidated joint ventures	1,411	0
Net cash provided by investing activities	490,434	415,578
Cash Flows from Financing Activities:
Financing costs paid	(628)	(3,111)
Prepayments to settle debt	0	(17,921)
Proceeds from lines of credit and notes payable	0	435,000
Repayments of lines of credit and notes payable	(201,625)	(745,070)
Proceeds from issuance of bonds payable	0	348,691
Repayment of bonds payable	0	(250,000)
Distributions paid to stockholders	(109,561)	(148,474)
Redemptions of common stock	(59,090)	(26,186)
Net cash used in financing activities	(370,904)	(407,071)
Net increase (decrease) in cash and cash equivalents	166,645	158,211
Cash and cash equivalents, beginning of period	216,085	32,645
Cash and cash equivalents, end of period	$ 382,730	$ 190,856

Organization

Organization	9 Months Ended
	Sep. 30, 2017
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, develops, owns, leases, and operates real properties directly, through wholly owned subsidiaries, or through unconsolidated joint ventures. Unless otherwise noted, 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 September 30, 2017 , Columbia Property Trust owned 16 operating properties, of which 12 were wholly owned and four were owned through unconsolidated joint ventures. These properties are located primarily in New York, San Francisco, Washington, D.C., and Atlanta, contain a total of 8.2 million rentable square feet, and were approximately 95.1% leased as of September 30, 2017 . In October 2017, Columbia Property Trust acquired two wholly owned properties in New York and a 55.0% interest in an additional property in Washington, D.C. See Note 3, Real Estate Transactions , for additional information.

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2017
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, 2016 (the " 2016 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 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 construction, 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. Estimated fair values are calculated based on the following hierarchy of information, depending upon availability: (i) recently quoted market prices, (ii) market prices for comparable properties, or (iii) the present value of future cash flows, including estimated residual value. 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. 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 September 30, 2017 . 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. 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 the following criteria are met: • Management, having the authority to approve the action, commits to a plan to sell the property. • The property is available for immediate sale in its present condition subject only to terms that are usual and customary for sales of such property. • An active program to locate a buyer and other actions required to complete the plan to sell the property have been initiated. • The property is being actively marketed for sale at a price that is reasonable in relation to its current fair value. • Actions required to complete the plan indicate that it is unlikely that significant changes to the plan will be made or that the plan will be withdrawn. • The sale of the property is probable (i.e., typically subject to a binding sale contract with a non-refundable deposit), and transfer of the property is expected to qualify for recognition as a completed sale within one year. At such time that a property is determined to be 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; and assets and liabilities are required to be classified as held for sale on the accompanying consolidated balance sheet. As of September 30, 2017 , none of Columbia Property Trust's properties met the criteria to be classified as held for sale in the accompanying balance sheet. As of December 31, 2016, Key Center Tower, Key Center Marriott, 5 Houston Center, Energy Center I, and 515 Post Oak were subject to binding sale contracts and met the other aforementioned criteria; thus, these properties are classified as held for sale in the accompanying consolidated balance sheet as of that date. The sale of 5 Houston Center, Energy Center I, and 515 Post Oak closed on January 6, 2017, and the sale of Key Center Tower and Key Center Marriott closed on January 31, 2017 (see Note 3, Real Estate Transactions ). The major classes of assets and liabilities classified as held for sale as of December 31, 2016 , are provided below (in thousands): December 31, 2016 Real estate assets held for sale: Real estate assets, at cost: Land $ 30,243 Buildings and improvements, less accumulated depreciation of $152,246 366,126 Intangible lease assets, less accumulated amortization of $28,545 13,365 Construction in progress 2,772 Total real estate assets held for sale, net $ 412,506 Other assets held for sale: Tenant receivables, net of allowance for doubtful accounts $ 1,722 Straight-line rent receivable 20,221 Prepaid expenses and other assets 3,184 Intangible lease origination costs, less accumulated amortization of $22,949 1,815 Deferred lease costs, less accumulated amortization of $11,203 18,587 Total other assets held for sale, net $ 45,529 Liabilities held for sale: Accounts payable, accrued expenses, and accrued capital expenditures $ 34,812 Deferred income 4,214 Intangible lease liabilities, less accumulated amortization of $1,239 2,737 Total liabilities held for sale, net $ 41,763 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 September 30, 2017 and December 31, 2016 , Columbia Property Trust had the following intangible in-place lease assets and liabilities, 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 September 30, 2017 Gross $ 1,588 $ 112,145 $ 83,599 $ 29,328 Accumulated Amortization (784 ) (67,035 ) (55,532 ) (19,437 ) Net $ 804 $ 45,110 $ 28,067 $ 9,891 December 31, 2016 Gross $ 10,589 $ 154,582 $ 128,857 $ 77,939 Accumulated Amortization (9,305 ) (83,254 ) (74,578 ) (44,564 ) Net $ 1,284 $ 71,328 $ 54,279 $ 33,375 For the three and nine months ended September 30, 2017 and 2016 , 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 September 30, 2017 $ 22 $ 3,268 $ 1,957 $ 1,006 For the three months ended September 30, 2016 $ 594 $ 6,133 $ 3,757 $ 2,768 For the nine months ended September 30, 2017 $ 471 $ 12,525 $ 7,786 $ 5,322 For the nine months ended September 30, 2016 $ 2,014 $ 22,602 $ 13,811 $ 10,206 The net intangible assets and liabilities remaining as of September 30, 2017 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 2017 $ 22 $ 2,936 $ 1,875 $ 898 For the years ending December 31: 2018 89 11,083 7,315 3,278 2019 89 9,800 7,024 3,128 2020 89 7,880 5,979 1,992 2021 89 4,043 2,057 327 2022 89 2,664 1,079 94 Thereafter 337 6,704 2,738 174 $ 804 $ 45,110 $ 28,067 $ 9,891 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 September 30, 2017 and December 31, 2016 , and recognized amortization of these assets of approximately $0.6 million for the three months ended September 30, 2017 and 2016 , and approximately $1.9 million for the nine months ended September 30, 2017 and 2016 , respectively. As of September 30, 2017 , the remaining net below-market intangible lease assets will be amortized as follows (in thousands): For the remainder of 2017 $ 637 For the years ending December 31: 2018 2,549 2019 2,549 2020 2,549 2021 2,549 2022 2,549 Thereafter 105,403 $ 118,785 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 either as prepaid expenses and other assets or as accounts payable, accrued expenses, and accrued capital expenditures. Changes in the fair value of the effective portion of interest rate swaps that are designated as cash flow hedges are recorded as other comprehensive income, while changes in the fair value of the ineffective portion of a cash flow hedge, if any, are recognized currently in earnings. 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 September 30, December 31, Derivatives designated as hedging instruments: Interest rate contracts Accounts payable $ (737 ) $ (882 ) 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 Nine Months Ended 2017 2016 2017 2016 Market value adjustment to interest rate swaps designated as hedging instruments and included in other comprehensive income $ 148 $ 1,250 $ 146 $ (5,629 ) 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. Prepaid Expenses and Other Assets Prepaid expenses are recognized over the period to which the good or service relates. Other assets are written off when the asset no longer has future value, or when the company is no longer obligated for the corresponding liability. As of September 30, 2017, prepaid expenses and other assets included $52.0 million of earnest money deposits for acquisitions, of which $40.0 million was applied to the purchase prices for transactions that closed in October 2017. See Note 3, Real Estate Transactions , for additional detail. 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 25% 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 August 2017, the Financial Accounting Standards Board (the "FASB") issued Accounting Standard Update 2017-12, Targeted Improvements to Accounting for Hedging Activities ("ASU 2017-12"). ASU 2017-12 aligns reporting requirements for hedging relationships with risk management activities and simplifies the application of hedge accounting. ASU 2017-12 eliminates the concept of recognizing periodic hedge ineffectiveness for cash flow hedges and allows for ongoing qualitative, rather than quantitative, testing of hedge effectiveness. ASU 2017-12 will be effective for Columbia Property Trust on January 1, 2019, with early adoption permitted. Columbia Property Trust anticipates that the adoption of ASU 2017-12 will result in a simplified process to determine the ongoing effectiveness of its cash flow hedge with no material impact on its consolidated financial statements or other disclosures. 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 will apply to the partial sale of non-financial assets, including real estate assets, to unconsolidated joint ventures. ASU 2017-05 will require 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 by recognizing a gain or loss on 100% of the asset transferred (i.e. to fully step-up the basis of our residual investment in the joint venture). This ASU will apply to Columbia Property Trust's partial sales of the following real estate assets: Market Square, 333 Market Street, and University Circle. We expect to implement ASU 2017-05 effective January 1, 2018 using the modified-retrospective approach by recording a cumulative-effect adjustment to equity, and are in the process of evaluating the impact to the financial statements. In January 2017, the FASB issued Accounting Standards Update 2017-01, Clarifying the Definition of a Business ("ASU 2017-01"), which provides a more narrow definition of a business to be used in determining the accounting treatment of acquisitions. As a result, under the new standard, many acquisitions that previously qualified as business combinations will be treated as asset acquisitions. For asset acquisitions, unlike business combinations, transaction costs may be capitalized, and purchase price may be allocated on a relative fair-value basis. Columbia Property Trust expects the adoption of ASU 2017-01 to simplify purchase price allocations for future acquisitions. ASU 2017-01 is effective for Columbia Property Trust prospectively on January 1, 2018, with early adoption permitted. Columbia Property Trust plans to adopt ASU 2017-01 in the fourth quarter of 2017, in connection with the acquisition of 245-249 West 17th Street and 218 West 18th Street. 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, including the classification of lease components and nonlease components, such as services provided to tenants. 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. Once effective, Columbia Property Trust anticipates separating lease components from nonlease components, which will be evaluated under ASU 2014-09, as described below. 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 will require companies to perform a five-step analysis of transactions to determine when and how revenue is recognized. Columbia Property Trust expects that the new standard to apply primarily to fees earned from managing properties owned by its unconsolidated joint ventures. Given the structure of the asset and property management agreements currently in place with our unconsolidated joint ventures, we do not expect the ASU to materially impact the timing or amount of our revenues; however, we will be required to provide more extensive disclosures about our revenue streams and contracts with customers. ASU 2014-09 is effective for Columbia Property Trust on January 1, 2018, with early adoption permitted.

Real Estate Transactions

Real Estate Transactions	9 Months Ended
	Sep. 30, 2017
Real Estate [Abstract]
Real Estate Transactions	Real Estate Transactions Acquisitions During 2016 and 2017, Columbia Property Trust acquired the following properties and partial interests in properties: Property Location Date Percent Acquired Purchase Price (in thousands) (1) 1800 M Street (2) Washington, D.C. October 11, 2017 55.0 % $ 231,550 245-249 West 17th Street & 218 West 18th Street (3) New York, NY October 11, 2017 100.0 % $ 514,100 114 Fifth Avenue (4) New York, NY July 6, 2017 49.5 % $ 108,900 (1) Exclusive of transaction costs and price adjustments. (2) On October 11, 2017, Columbia Property Trust entered a new joint venture partnership with Allianz Real Estate ("Allianz"), which simultaneously acquired 1800 M Street, a 10 -story, 581,000 -square-foot office building in Washington, D.C., that is 94% leased, for a total of $421.0 million (the “1800 M Street Joint Venture”). Columbia Property Trust owns a 55% interest in the 1800 M Street Joint Venture, and Allianz owns the remaining 45% . As of September 30, 2017, Columbia Property Trust had deposited $15.0 million in earnest money related to 1800 M Street, which is included in prepaid expenses and other assets on the accompanying consolidated balance sheet. (3) 245-249 West 17th Street is made up of two interconnected 12- and 6-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. The buildings are located in New York, 100% leased, and unencumbered by debt. As of September 30, 2017, Columbia Property Trust had deposited $25.0 million in earnest money related to this transaction, which is included in prepaid expenses and other assets on the accompanying consolidated balance sheet. (4) 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 is 100% leased, 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 will continue to perform asset and property management services for the property. 149 Madison Avenue Contract In February 2017, Columbia Property Trust deposited $12.0 million of earnest money upon entering a firm contract to purchase 149 Madison Avenue, a 12-story, 127,000 -square-foot office building in New York. Closing is expected to occur later this year. Dispositions During 2016 and 2017 , Columbia Property Trust sold the following properties: Property Location Date Sales Price (1) (in thousands) Gain (Loss) on Sale (in thousands) 2017 University Circle & 333 Market Street (2) San Francisco, CA July 6, 2017 $ 234,000 $ 102,365 Key Center Tower & Marriott (3) Cleveland, OH January 31, 2017 $ 267,500 $ 9,500 Houston Properties (4) Houston, TX January 6, 2017 $ 272,000 $ 63,700 2016 SanTan Corporate Center Phoenix, AZ December 15, 2016 $ 58,500 $ 9,800 Sterling Commerce Dallas, TX November 30, 2016 $ 51,000 $ 12,500 9127 South Jamaica Street Denver, CO October 12, 2016 $ 19,500 $ — (5) 80 Park Plaza Newark, NJ September 30, 2016 $ 174,500 $ 21,600 9189, 9191 & 9193 South Jamaica Street Denver, CO September 22, 2016 $ 122,000 $ 27,200 800 North Frederick Suburban, MD July 8, 2016 $ 48,000 $ 2,100 100 East Pratt Baltimore, MD March 31, 2016 $ 187,000 $ (300 ) (1) Exclusive of transaction costs and price adjustments. (2) 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 Real Estate ("Allianz"), an unrelated third party (collectively, the "San Francisco Joint Ventures"). Upon the earlier of July 6, 2018, or when Columbia Property Trust and Allianz jointly invest $600.0 million in additional assets acquisitions (excluding the 114 Fifth Avenue building described above), Allianz will acquire another 22.5% interest in each of the San Francisco Joint Ventures at the same aggregate price, $234.0 million , adjusted for any capital expenditures made during the intervening period at the properties. The $600.0 million investment hurdle has been reduced by the aggregate adjusted purchase price for the 1800 M Street acquisition described above. (3) 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 net income of $9.6 million for the first nine months of 2016, and a net loss of $1.9 million for the first 31 days of 2017, excluding the gain on sale. (4) 5 Houston Center, Energy Center I, and 515 Post Oak were sold in one transaction. These properties generated net income of $10.8 million for the first nine months of 2016, and a net loss of $14.9 thousand for the first six days of 2017, excluding the gain on sale. (5) Columbia Property Trust recorded a de minimus loss on the sale of 9127 South Jamaica Street.

Unconsolidated Joint Ventures

Unconsolidated Joint Ventures	9 Months Ended
	Sep. 30, 2017
Equity Method Investments and Joint Ventures [Abstract]
Unconsolidated Joint Ventures	Unconsolidated Joint Ventures As of September 30, 2017 , Columbia Property Trust owns interests in the following properties through joint ventures, which are accounted for using the equity method of accounting: Carrying Value of Investment Joint Venture Property Name Geographic Market Ownership Interest September 30, 2017 December 31, 2016 Market Square Joint Venture Market Square Washington, D.C. 51.0 % $ 126,638 $ 127,346 University Circle Joint Venture (1) University Circle San Francisco 77.5 % (2) 170,712 — 333 Market Street Joint Venture (1) 333 Market Street San Francisco 77.5 % (2) 288,405 — 114 Fifth Avenue Joint Venture (1) 114 Fifth Avenue New York 49.5 % 112,350 — $ 698,105 $ 127,346 (1) See Note 3, Real Estate Transactions, for a description of the formation of these joint ventures in the current period. (2) Upon the earlier of July 6, 2018, or when Columbia Property Trust and Allianz jointly invest $600.0 million in additional assets acquisitions (excluding 114 Fifth Avenue), Allianz will acquire 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% . The $600.0 million investment hurdle has been reduced by the aggregate adjusted purchase price for the 1800 M Street acquisition described in Note 3, Real Estate Transactions . 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 investment 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 September 30, 2017 . Mortgage Debt and Related Guaranty The Market Square joint venture is the only joint venture with mortgage debt. As of September 30, 2017 and December 31, 2016 , 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 September 30, 2017 from $16.1 million as of December 31, 2016 , 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 September 30, 2017 December 31, 2016 September 30, 2017 December 31, 2016 September 30, 2017 December 31, 2016 Market Square Joint Venture $ 582,664 $ 587,344 $ 324,682 $ 324,656 $ 239,207 $ 242,802 University Circle Joint Venture 225,434 — — — 217,138 (1) — 333 Market Street Joint Venture 385,930 — — — 369,177 (1) — 114 Fifth Avenue Joint Venture 388,786 — — — 174,246 (1) — $ 1,582,814 $ 587,344 $ 324,682 $ 324,656 $ 999,768 $ 242,802 (1) There is an aggregate basis difference of $30.8 million related to the University Circle Joint Venture, the 333 Market Street Joint Venture and the 114 Fifth Avenue Joint Venture. Such difference represents the differences between the historical costs reflected at the joint venture level, and Columbia Property Trust's investment in the joint ventures. The basis differences result from the timing of each partner's acquisition of an interest in the joint venture and formation costs incurred by Columbia Property Trust, and will be amortized to income (loss) from unconsolidated joint ventures over the life of the related assets. Summarized income statement information for the unconsolidated joint ventures for the three months ended September 30, 2017 and September 30, 2016 is as follows (in thousands): Total Revenues Net Income (Loss) Columbia Property Trust's Share of Net Income (Loss) 2017 2016 2017 2016 2017 2016 Market Square Joint Venture $ 10,474 $ 9,787 $ (4,089 ) $ (3,799 ) $ (2,086 ) $ (1,937 ) University Circle Joint Venture 9,448 — 4,810 — 3,701 — 333 Market Street Joint Venture 6,306 — 3,381 — 2,593 — 114 Fifth Avenue Joint Venture 9,832 — (2,332 ) — (1,355 ) — $ 36,060 $ 9,787 $ 1,770 $ (3,799 ) $ 2,853 $ (1,937 ) Summarized income statement information for the unconsolidated joint ventures for the nine months ended September 30, 2017 and September 30, 2016 is as follows (in thousands): Total Revenues Net Income (Loss) Columbia Property Trust's Share of Net Income (Loss) 2017 2016 2017 2016 2017 2016 Market Square Joint Venture $ 31,036 $ 31,226 $ (11,348 ) $ (10,669 ) $ (5,788 ) $ (5,441 ) University Circle Joint Venture 9,448 — 4,810 — 3,701 — 333 Market Street Joint Venture 6,306 — 3,381 — 2,593 — 114 Fifth Avenue Joint Venture 9,832 — (2,332 ) — (1,355 ) — $ 56,622 $ 31,226 $ (5,489 ) $ (10,669 ) $ (849 ) $ (5,441 ) 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 , and the 333 Market 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 and nine months ended September 30, 2017 and 2016, Columbia Property Trust earned the following fees from these unconsolidated joint ventures: For the three months ended September 30, For the nine months ended September 30, 2017 2016 2017 2016 Market Square Joint Venture $ 496 $ 511 $ 1,468 $ 1,655 University Circle Joint Venture 480 — 480 — 333 Market Street Joint Venture 178 — 178 — $ 1,154 $ 511 $ 2,126 $ 1,655 Columbia Property Trust also received reimbursements of property operating costs of $0.9 million and $0.1 million for the three months ended September 30, 2017 and 2016, respectively, and $1.2 million and $0.4 million for the nine months ended September 30, 2017 and 2016, respectively, which are included in other property income revenues in the accompanying consolidated statements of operations. Property management fees of $0.3 million and $0.1 million , respectively, 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 September 30, 2017 and December 31, 2016 , respectively.

Line of Credit and Notes Payabl

Line of Credit and Notes Payable	9 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Line of Credit and Notes Payable	Line of Credit and Notes Payable As of September 30, 2017 and December 31, 2016 , Columbia Property Trust had the following line of credit and notes payable indebtedness (excluding bonds payable; see Note 6, Bonds Payable ) in thousands: Facility September 30, December 31, $300 Million Term Loan $ 300,000 $ 300,000 $150 Million Term Loan 150,000 150,000 263 Shuman Boulevard building mortgage note (1) 49,000 49,000 One Glenlake building mortgage note 23,978 26,315 650 California Street building mortgage note — 126,287 221 Main Street building mortgage note — 73,000 Revolving Credit Facility — — Less: Deferred financing costs related to term loans and notes payable, net of accumulated amortization (2,611 ) (3,136 ) $ 520,367 $ 721,466 (1) The OfficeMax lease expired in May 2017, and the mortgage note matured in July 2017. Columbia Property Trust is working with the special-servicer to effect the transfer of the property to the lender in settlement of the loan principal, accrued interest expense and accrued property operating expenses. In the third quarter of 2017, Columbia Property Trust accrued related interest expense of $1.3 million at the default rate of 10.55% , and property operating expenses of $0.2 million , primarily related to property taxes. Fair Value of Debt The estimated fair value of Columbia Property Trust's line of credit and notes payable as of September 30, 2017 and December 31, 2016 , was approximately $524.2 million and $728.5 million , respectively. The related carrying value of the line of credit and notes payable as of September 30, 2017 and December 31, 2016 , was $523.0 million and $724.6 million , respectively. Columbia Property Trust estimated the fair value of the $300 Million Term Loan (the " $300 Million Term 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 nine months ended September 30, 2017 and 2016 , Columbia Property Trust made interest payments totaling approximately $15.6 million and $21.7 million , respectively, of which approximately $0.4 million and $0.2 million , respectively, was capitalized. As of September 30, 2017 , 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 August 17, 2017, Columbia Property Trust repaid the $124.8 million balance of the 650 California Street building mortgage note, which was originally scheduled to mature on July 1, 2019. Columbia Property Trust recognized a loss on early extinguishment of debt of $0.3 million related to unamortized deferred financing costs. On March 10, 2017, Columbia Property Trust repaid the $73.0 million balance of the 221 Main Street building mortgage note, which was originally scheduled to mature on May 10, 2017. Columbia Property Trust recognized a loss on early extinguishment of debt of $45,000 related to unamortized deferred financing costs. Term Loan Amendment On July 25, 2017, Columbia Property Trust amended the terms of its $150 Million Term Loan, to reduce the current interest rate from 3.52% to 3.07% per annum. The amendment reduced the interest rate from LIBOR, plus an applicable margin ranging from 1.40% to 2.35% , to LIBOR, plus an applicable margin ranging from 0.90% to 1.75% . The maturity date, debt covenants, and other terms of the $150 Million Term Loan are unchanged. The interest rate is effectively fixed with an interest rate swap agreement, which is designated as a cash flow hedge.

Bonds Payable

Bonds Payable	9 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Bonds Payable	Bonds Payable On August 12, 2016, Columbia Property Trust OP issued $350.0 million of 10 -year, unsecured 3.650% senior notes at 99.626% of their face value (the "2026 Bonds Payable"), which are guaranteed by Columbia Property Trust. Columbia Property Trust OP received net proceeds from the 2026 Bonds Payable of $346.4 million , which were used to redeem $250.0 million of seven -year, unsecured 5.875% senior notes (the "2018 Bonds Payable"). The 2026 Bonds Payable require semi-annual interest payments in February and August based on a contractual annual interest rate of 3.650% . In the accompanying consolidated balance sheets, the 2026 Bonds Payable are shown net of the initial issuance discount of approximately $1.3 million , which is being amortized to interest expense over the term of the 2026 Bonds Payable using the effective interest method. The principal amount of the 2026 Bonds Payable is due and payable on the maturity date, August 15, 2026. In March 2015, Columbia Property Trust OP issued $350.0 million of 10 -year, unsecured 4.150% senior notes at 99.859% of their face value (the "2025 Bonds Payable"), which are guaranteed by Columbia Property Trust. Columbia Property Trust OP received proceeds from the 2025 Bonds Payable, net of fees, of $347.2 million . The 2025 Bonds Payable require semi-annual interest payments in April and October based on a contractual annual interest rate of 4.150% . In the accompanying consolidated balance sheets, the 2025 Bonds Payable are shown net of the initial issuance discount of approximately $0.5 million , which is being amortized to interest expense over the term of the 2025 Bonds Payable using the effective interest method. The principal amount of the 2025 Bonds Payable is due and payable on the maturity date, April 1, 2025 . Interest payments of $20.1 million were made on the 2026 Bonds Payable and 2025 Bonds Payable during the nine months ended September 30, 2017 , and $20.8 million in interest payments were made on the 2025 Bonds Payable or the 2018 Bonds Payable during the nine months ended September 30, 2016 . Columbia Property Trust is subject to substantially similar covenants under the 2026 Bonds Payable and the 2025 Bonds Payable. As of September 30, 2017 , 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 September 30, 2017 and December 31, 2016 , the estimated fair value of the 2026 Bonds Payable and the 2025 Bonds Payable was approximately $702.9 million and $703.1 million , respectively. The related carrying value of the bonds payable, net of discounts, as of September 30, 2017 and December 31, 2016 , was $698.5 million and $698.3 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	9 Months Ended
	Sep. 30, 2017
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 September 30, 2017 , 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 September 30, 2017 . 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 September 30, 2017 . 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	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity Common Stock Repurchase Program Columbia Property Trust's board of directors authorized the repurchase of up to an aggregate of $200 million of its common stock, par value $0.01 per share, from September 4, 2015 through September 4, 2017 (the "2015 Stock Repurchase Program"). Under the 2015 Stock Repurchase Program, Columbia Property Trust acquired 5.6 million shares at an average price of $21.85 per share, for aggregate purchases of $121.4 million . Columbia Property Trust's board of directors authorized a second 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 September 30, 2017 , Columbia Property Trust repurchased an additional 1.4 million shares at an average price of $21.02 per share, for aggregate purchases of $30.1 million under the 2015 Stock Repurchase Program and 2017 Stock Repurchase Program. As of September 30, 2017 , $194.8 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 Plan Columbia Property Trust maintains a shareholder-approved, long-term incentive plan (the "LTIP") 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. In 2017, Columbia Property Trust has granted 139,825 shares of common stock to employees under the LTIP for 2017. Such awards are time-based and will vest ratably on each anniversary of the grant over the next four years . Performance-based stock unit awards representing 330,880 shares were also made in 2017. The payout of these performance-based awards can range from 0% to 150% , depending on total shareholder return relative to the FTSE NAREIT Equity Office Index, over a three -year performance period. At the conclusion of the three -year performance period, 75% of the shares earned will vest, and the remaining 25% vest one year later. The performance-based awards also include one - and two -year transitional awards, which will vest at the end of the respective performance periods. The awards will be expensed over the vesting period, using the estimated fair value for each award. Time-based awards will be expensed using the grant-date fair value or closing price of the award on the grant date. Performance-based awards will be expensed over the vesting period at the estimated fair value of the grant date, as determined by the Monte Carlo valuation method. Additionally, on January 20, 2017, Columbia Property Trust granted 193,535 shares of common stock to employees, net of 17,938 shares withheld to settle the related tax liability, under the LTIP for 2016 performance, of which 25% vested upon grant; the remaining shares will vest ratably, with the passage of time, on January 31, 2018, 2019, and 2020. Employees receive quarterly dividends related to their entire grant, including the unvested shares, on each dividend payment date. A summary of the activity for the employee stock grants under the LTIP for the nine months ended September 30, 2017 follows: For the Nine Months Ended Shares Weighted-Average (1) Unvested shares – beginning of period 256 $ 22.62 Granted 664 $ 20.20 Vested (161 ) $ 22.67 Forfeited (9 ) $ 21.12 Unvested shares – end of period (2) 750 $ 20.48 (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 September 30, 2017 , we expect approximately 694,928 of the 750,000 unvested shares to ultimately vest, assuming a weighted average forfeiture rate of 4.7% , which was determined based on peer company data, adjusted for the specifics of the LTIP. During the nine months ended September 30, 2017 and 2016 , Columbia Property Trust paid equity retainers to its independent directors under the LTIP by granting the following shares, all of which vested immediately: Date of Grant Shares Grant-Date Fair Value 2017 Director Grants: January 3, 2017 8,279 $ 21.58 May 2, 2017 33,581 (1) $ 22.57 2016 Director Grants: January 4, 2016 7,439 $ 23.00 April 1, 2016 8,120 $ 21.89 July 1, 2016 8,158 $ 21.52 (1) On May 2, 2017, the independent directors’ equity retainers were paid for the ensuing annual period. Prior to this time, the independent directors’ equity retainers were paid quarterly. For the three and nine months ended September 30, 2017 and 2016 , Columbia Property Trust incurred the stock-based compensation expense related to the following events (in thousands): Three Months Ended Nine Months Ended 2017 2016 2017 2016 Amortization of LTIP awards $ 917 $ 650 $ 2,721 $ 2,190 Amortization of future LTIP awards (1) 639 91 1,851 797 Issuance of shares to independent directors — 176 937 525 Total stock-based compensation expense $ 1,556 $ 917 $ 5,509 $ 3,512 (1) Reflects amortization of LTIP awards 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 September 30, 2017 and December 31, 2016 , there was $9.9 million and $3.2 million , respectively, of unrecognized compensation costs related to unvested awards under the LTIP, which will be amortized over the respective vesting period, ranging from one to four years at the time of grant. Effective in 2017, Columbia Property Trust changed from an LTIP measured over a one -year performance period to an LTIP measured over a three -year performance period and, as a result, has issued additional unvested shares this year.

Supplemental Disclosures of Non

Supplemental Disclosures of Noncash Investing and Financing Activities	9 Months Ended
	Sep. 30, 2017
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 nine months ended September 30, 2017 and 2016 (in thousands): Nine Months Ended 2017 2016 Investments in real estate funded with other assets $ 311 $ 1,442 Real estate assets transferred to unconsolidated joint ventures $ 558,122 $ — Other assets transferred to unconsolidated joint ventures $ 43,670 $ — Other liabilities transferred to unconsolidated joint ventures $ 21,347 $ — Discount on issuance of bonds payable $ — $ 1,309 Deposits applied to sales of real estate $ 10,000 $ — Amortization of net discounts on debt $ 135 $ 222 Market value adjustments to interest rate swaps that qualify for hedge accounting treatment $ 146 $ (5,629 ) Accrued capital expenditures and deferred lease costs $ 25,866 $ 16,074 Accrued deferred financing costs $ — $ 12 Common stock issued to employees and directors, and amortized (net of income tax withholdings) $ 4,061 $ 2,339

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share For the three and nine months ended September 30, 2017 and 2016 , in computing the basic and diluted earnings per share, net income has been reduced for the dividends paid on unvested shares related to unvested awards under the LTIP. 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 and nine months ended September 30, 2017 and 2016 (in thousands): Three Months Ended Nine Months Ended 2017 2016 2017 2016 Net income $ 101,534 $ 36,898 $ 177,389 $ 56,881 Distributions paid on unvested shares (84 ) (77 ) (253 ) (237 ) Net income used to calculate basic and diluted earnings per share $ 101,450 $ 36,821 $ 177,136 $ 56,644 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 and nine months ended September 30, 2017 and 2016 , respectively (in thousands): Three Months Ended Nine Months Ended 2017 2016 2017 2016 Weighted-average common shares – basic 120,293 123,215 121,270 123,271 Plus incremental weighted-average shares from time-vested conversions, less assumed share repurchases: Previously granted LTIP awards, unvested 116 82 89 46 Future LTIP awards 120 53 99 31 Weighted-average common shares – diluted 120,529 123,350 121,458 123,348

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2017
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 September 30, 2017 , 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 plan to make further investments. During the periods presented, there have been no material inter-segment 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. When assessing ongoing performance of our reportable segments, management does not evaluate assets or capital expenditures by reportable segment. Additionally, expenses, such as depreciation and amortization and others included in the reconciliation of GAAP net income to NOI, are reviewed by management on a consolidated basis, rather than by reportable segment. The following table presents operating revenues included in NOI by geographic reportable segment (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 New York (1) $ 30,488 $ 23,996 $ 83,598 $ 89,683 San Francisco (2) 25,337 26,407 80,112 82,310 Atlanta 9,401 9,192 28,239 27,625 Washington, D.C. (3) 8,494 7,689 23,622 25,602 Boston 2,734 2,879 8,358 8,782 Los Angeles 1,899 1,635 5,534 5,526 All other office markets 2,772 39,558 17,219 124,383 Total office segments 81,125 111,356 246,682 363,911 Hotel (24 ) 6,343 1,199 17,705 Corporate 526 48 273 430 Total operating revenues $ 81,627 $ 117,747 $ 248,154 $ 382,046 (1) Includes operating revenues for 49.5% of 114 Fifth Avenue based on our ownership interest, from July 6, 2017 through September 30, 2017, which are included in equity in income (loss) of unconsolidated joint ventures in the accompanying consolidated statements of operations. (2) Includes operating revenues for 100.0% of 333 Market Street and University Circle through July 5, 2017. Includes operating revenues for 77.5% of 333 Market Street and University Circle based on our ownership interest, from July 6, 2017 through September 30, 2017, which are included in equity in income (loss) of unconsolidated joint ventures in the accompanying consolidated statements of operations. (3) Includes operating revenues for 51.0% of the Market Square buildings based on our ownership interest, for all periods presented. The following table presents NOI by geographic reportable segment (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 New York (1) $ 16,536 $ 11,380 $ 50,411 $ 52,515 San Francisco (2) 18,166 20,095 57,733 60,547 Atlanta 8,500 8,249 25,078 24,756 Washington, D.C. (3) 4,209 3,632 11,052 13,303 Boston 1,196 1,425 3,797 4,111 Los Angeles 1,155 894 3,439 3,336 All other office markets 4,071 23,723 15,598 76,111 Total office segments 53,833 69,398 167,108 234,679 Hotel (24 ) 1,301 (914 ) 3,171 Corporate (364 ) (59 ) (489 ) (137 ) Total $ 53,445 $ 70,640 $ 165,705 $ 237,713 (1) Includes NOI for 49.5% of 114 Fifth Avenue based on our ownership interest, from July 6, 2017 through September 30, 2017, which is included in equity in income (loss) of unconsolidated joint ventures in the accompanying consolidated statements of income. (2) Includes NOI for 100.0% of 333 Market Street and University Circle through July 5, 2017. Includes NOI for 77.5% of 333 Market Street and University Circle based on our ownership interest, from July 6, 2017 through September 30, 2017, which is included in equity in income (loss) of unconsolidated joint ventures in the accompanying consolidated statements of income. (3) Includes NOI for 51.0% of the Market Square buildings based on our ownership interest, for all periods presented. A reconciliation of GAAP revenues to operating revenues is presented below (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 Total revenues $ 60,362 $ 113,266 $ 217,375 $ 367,775 Operating revenues included in income (loss) from unconsolidated joint ventures (1) 22,419 4,992 32,905 15,926 Asset and property management fee income (2) (1,154 ) (511 ) (2,126 ) (1,655 ) Total operating revenues $ 81,627 $ 117,747 $ 248,154 $ 382,046 (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. A reconciliation of GAAP net income to NOI is presented below (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 Net income $ 101,534 $ 36,898 $ 177,389 $ 56,881 Depreciation 18,501 26,778 60,529 84,517 Amortization 6,870 11,895 24,518 42,902 General and administrative - corporate 7,034 7,467 25,003 25,718 General and administrative - joint ventures 713 — 713 — Net interest expense 13,690 17,116 42,040 52,380 Interest income from development authority bonds (1,800 ) (1,800 ) (5,400 ) (5,400 ) Loss on early extinguishment of debt 280 18,905 325 18,997 Income tax expense (benefit) 3 65 (378 ) 387 Asset and property management fee income (1,154 ) (511 ) (2,126 ) (1,655 ) Adjustments included in income (loss) from unconsolidated joint ventures 10,139 4,239 18,610 13,069 Gain on sales of real estate assets (102,365 ) (50,412 ) (175,518 ) (50,083 ) NOI $ 53,445 $ 70,640 $ 165,705 $ 237,713

Financial Information for Paren

Financial Information for Parent Guarantor, Issuer Subsidiary, and Non-Guarantor Subsidiaries	9 Months Ended
	Sep. 30, 2017
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 nine months ended September 30, 2016 : increase to operating cash flows for the parent and issuer of $33.2 million and $102.4 million , respectively; and increase (decrease) in investing cash flows for the parent, issuer, and non-guarantors of $(172.8) million , $464.2 million and $482.1 million , respectively; and increase (decrease) in financing cash flows for the parent, issuer, and non-guarantors of $139.6 million , $(566.6) million and $(482.1) 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 September 30, 2017 and December 31, 2016 , as well as its condensed consolidating statements of operations and its condensed consolidating statements of comprehensive income for the three and nine months ended September 30, 2017 and 2016 ; and its condensed consolidating statements of cash flows for the nine months ended September 30, 2017 and 2016 . Condensed Consolidating Balance Sheets (in thousands) As of September 30, 2017 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Assets: Real estate assets, at cost: Land $ — $ — $ 609,110 $ — $ 609,110 Buildings and improvements, net — 58 1,704,572 — 1,704,630 Intangible lease assets, net — — 164,699 — 164,699 Construction in progress — — 49,255 — 49,255 Total real estate assets — 58 2,527,636 — 2,527,694 Investment in unconsolidated joint ventures — 698,105 — — 698,105 Cash and cash equivalents 359,813 16,800 6,117 — 382,730 Investment in subsidiaries 1,824,737 1,007,852 — (2,832,589 ) — Tenant receivables, net of allowance — 31 2,783 — 2,814 Straight-line rent receivable — — 80,128 — 80,128 Prepaid expenses and other assets 369,358 123,064 15,735 (432,355 ) 75,802 Intangible lease origination costs, net — — 28,067 — 28,067 Deferred lease costs, net — — 127,940 — 127,940 Investment in development authority bonds — — 120,000 — 120,000 Total assets $ 2,553,908 $ 1,845,910 $ 2,908,406 $ (3,264,944 ) $ 4,043,280 Liabilities: Line of credit and notes payable, net $ — $ 447,588 $ 503,542 $ (430,763 ) $ 520,367 Bonds payable, net — 693,562 — — 693,562 Accounts payable, accrued expenses, and accrued capital expenditures 2 11,049 118,751 — 129,802 Due to affiliates — — 1,592 (1,592 ) — Deferred income 4 81 15,671 — 15,756 Intangible lease liabilities, net — — 9,891 — 9,891 Obligations under capital lease — — 120,000 — 120,000 Total liabilities 6 1,152,280 769,447 (432,355 ) 1,489,378 Equity: Total equity 2,553,902 693,630 2,138,959 (2,832,589 ) 2,553,902 Total liabilities and equity $ 2,553,908 $ 1,845,910 $ 2,908,406 $ (3,264,944 ) $ 4,043,280 Condensed Consolidating Balance Sheets (in thousands) As of December 31, 2016 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Assets: Real estate assets, at cost: Land $ — $ — $ 751,351 $ — $ 751,351 Building and improvements, net — 219 2,120,931 — 2,121,150 Intangible lease assets, net — — 193,311 — 193,311 Construction in progress — — 36,188 — 36,188 Real estate assets held for sale, net — 34,956 377,550 — 412,506 Total real estate assets — 35,175 3,479,331 — 3,514,506 Investment in unconsolidated joint ventures — 127,346 — — 127,346 Cash and cash equivalents 174,420 16,509 25,156 — 216,085 Investment in subsidiaries 2,047,922 1,782,752 — (3,830,674 ) — Tenant receivables, net of allowance — — 7,163 — 7,163 Straight-line rent receivable — — 64,811 — 64,811 Prepaid expenses and other assets 317,153 262,216 15,593 (570,687 ) 24,275 Intangible lease origination costs, net — — 54,279 — 54,279 Deferred lease costs, net — — 125,799 — 125,799 Investment in development authority bonds — — 120,000 — 120,000 Other assets held for sale, net — 3,767 41,814 (52 ) 45,529 Total assets $ 2,539,495 $ 2,227,765 $ 3,933,946 $ (4,401,413 ) $ 4,299,793 Liabilities: Lines of credit and notes payable, net $ — $ 447,643 $ 704,585 $ (430,762 ) $ 721,466 Bonds payable, net — 692,972 — — 692,972 Accounts payable, accrued expenses, and accrued capital expenditures — 10,395 120,633 — 131,028 Dividends payable 36,727 — — — 36,727 Due to affiliates — 58 1,534 (1,592 ) — Deferred income — — 19,694 — 19,694 Intangible lease liabilities, net — — 33,375 — 33,375 Obligations under capital leases — — 120,000 — 120,000 Liabilities held for sale — 2,651 177,497 (138,385 ) 41,763 Total liabilities 36,727 1,153,719 1,177,318 (570,739 ) 1,797,025 Equity: Total equity 2,502,768 1,074,046 2,756,628 (3,830,674 ) 2,502,768 Total liabilities and equity $ 2,539,495 $ 2,227,765 $ 3,933,946 $ (4,401,413 ) $ 4,299,793 Consolidating Statements of Operations (in thousands) For the Three Months Ended September 30, 2017 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Revenues: Rental income $ — $ — $ 55,113 $ (98 ) $ 55,015 Tenant reimbursements — 7 3,046 — 3,053 Asset and property management fee income 569 — 585 — 1,154 Other property income — — 1,140 — 1,140 569 7 59,884 (98 ) 60,362 Expenses: Property operating costs — 113 18,552 (98 ) 18,567 Asset and property management fees — — 188 — 188 Depreciation — 310 18,191 — 18,501 Amortization — — 6,870 — 6,870 General and administrative - corporate 39 1,758 5,237 — 7,034 General and administrative - unconsolidated joint ventures — — 713 — 713 39 2,181 49,751 (98 ) 51,873 Real estate operating income (loss) 530 (2,174 ) 10,133 — 8,489 Other income (expense): Interest expense — (10,702 ) (8,803 ) 4,774 (14,731 ) Interest and other income 4,593 1,220 1,802 (4,774 ) 2,841 Loss on early extinguishment of debt — — (280 ) — (280 ) 4,593 (9,482 ) (7,281 ) — (12,170 ) Income (loss) before income taxes and unconsolidated entities: 5,123 (11,656 ) 2,852 — (3,681 ) Income tax expense — (1 ) (2 ) — (3 ) Income (loss) from unconsolidated entities 96,411 109,630 (1 ) (203,187 ) 2,853 Income (loss) before sales of real estate assets: 101,534 97,973 2,849 (203,187 ) (831 ) Gain on sales of real estate assets — — 102,365 — 102,365 Net income $ 101,534 $ 97,973 $ 105,214 $ (203,187 ) $ 101,534 Consolidating Statements of Operations (in thousands) For the Three Months Ended September 30, 2016 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Revenues: Rental income $ — $ 956 $ 86,702 $ (97 ) $ 87,561 Tenant reimbursements — 564 16,526 — 17,090 Hotel income — — 6,270 — 6,270 Asset and property management fee income 245 — 266 — 511 Other property income — — 1,930 (96 ) 1,834 245 1,520 111,694 (193 ) 113,266 Expenses: Property operating costs — 860 38,338 (97 ) 39,101 Hotel operating costs — — 4,946 — 4,946 Asset and property management fee expenses: Related-party — 40 — (40 ) — Other — — 387 — 387 Depreciation — 745 26,033 — 26,778 Amortization — 86 11,809 — 11,895 General and administrative - corporate 38 2,297 5,188 (56 ) 7,467 38 4,028 86,701 (193 ) 90,574 Real estate operating income (loss) 207 (2,508 ) 24,993 — 22,692 Other income (expense): Interest expense — (12,249 ) (12,256 ) 7,367 (17,138 ) Interest and other income 3,571 3,813 1,822 (7,367 ) 1,839 Loss on early extinguishment of debt — (18,905 ) — — (18,905 ) 3,571 (27,341 ) (10,434 ) — (34,204 ) Income (loss) before income taxes and unconsolidated entities: 3,778 (29,849 ) 14,559 — (11,512 ) Income tax expense — — (65 ) — (65 ) Income from subsidiaries 33,120 61,442 — (94,562 ) — Loss from unconsolidated joint venture — (1,937 ) — — (1,937 ) Income (loss) before sale of real estate assets: 36,898 29,656 14,494 (94,562 ) (13,514 ) Gain on sale of real estate assets — — 50,412 — 50,412 Net income $ 36,898 $ 29,656 $ 64,906 $ (94,562 ) $ 36,898 Consolidating Statements of Operations (in thousands) For the Nine Months Ended September 30, 2017 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Revenues: Rental income $ — $ 51 $ 193,551 $ (293 ) $ 193,309 Tenant reimbursements — (59 ) 18,668 — 18,609 Hotel income — — 1,339 — 1,339 Asset and property management fee income 1,059 — 1,067 — 2,126 Other property income — — 2,010 (18 ) 1,992 1,059 (8 ) 216,635 (311 ) 217,375 Expenses: Property operating costs — 241 64,555 (293 ) 64,503 Hotel operating costs — — 2,085 — 2,085 Asset and property management fee expenses: Related-party — 3 — (3 ) — Other — — 717 — 717 Depreciation — 544 59,985 — 60,529 Amortization — 5 24,513 — 24,518 General and administrative - corporate 135 7,013 17,870 (15 ) 25,003 General and administrative - unconsolidated joint ventures — — 713 — 713 135 7,806 170,438 (311 ) 178,068 Real estate operating income (loss) 924 (7,814 ) 46,197 — 39,307 Other income (expense): Interest expense — (31,554 ) (27,935 ) 15,181 (44,308 ) Interest and other income 12,923 4,517 5,409 (15,181 ) 7,668 Loss on early extinguishment of debt — — (325 ) — (325 ) 12,923 (27,037 ) (22,851 ) — (36,965 ) Income (loss) before income taxes, unconsolidated entities, and sales of 13,847 (34,851 ) 23,346 — 2,342 Income tax benefit (expense) — (1 ) 379 — 378 Income (loss) from unconsolidated entities 163,542 188,832 — (353,223 ) (849 ) Income before sales of real estate assets: 177,389 153,980 23,725 (353,223 ) 1,871 Gains on sales of real estate assets — 11,050 164,468 — 175,518 Net income $ 177,389 $ 165,030 $ 188,193 $ (353,223 ) $ 177,389 For the Nine Months Ended September 30, 2016 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Revenues: Rental income $ — $ 2,669 $ 278,330 $ (285 ) $ 280,714 Tenant reimbursements — 1,421 54,130 — 55,551 Hotel income — — 17,484 — 17,484 Asset and property management fee income 735 — 920 — 1,655 Other property income — — 12,651 (280 ) 12,371 735 4,090 363,515 (565 ) 367,775 Expenses: Property operating costs — 2,360 118,604 (285 ) 120,679 Hotel operating costs — — 14,315 — 14,315 Asset and property management fee expenses: Related-party — 112 — (112 ) — Other — — 1,058 — 1,058 Depreciation — 2,166 82,351 — 84,517 Amortization — 239 42,663 — 42,902 General and administrative - corporate 116 6,575 19,195 (168 ) 25,718 116 11,452 278,186 (565 ) 289,189 Real estate operating income (loss) 619 (7,362 ) 85,329 — 78,586 Other income (expense): Interest expense — (36,479 ) (38,071 ) 22,135 (52,415 ) Interest and other income 10,680 11,471 5,436 (22,135 ) 5,452 Loss on early extinguishment of debt — (18,987 ) (10 ) — (18,997 ) 10,680 (43,995 ) (32,645 ) — (65,960 ) Income (loss) before income taxes, unconsolidated entities, and sales of 11,299 (51,357 ) 52,684 — 12,626 Income tax expense — (12 ) (375 ) — (387 ) Income from unconsolidated entities 45,582 89,972 — (135,554 ) — Loss from unconsolidated joint venture — (5,441 ) — — (5,441 ) Income before sales of real estate assets: 56,881 33,162 52,309 (135,554 ) 6,798 Gain on sales of real estate assets — — 50,083 — 50,083 Net income $ 56,881 $ 33,162 $ 102,392 $ (135,554 ) $ 56,881 Consolidating Statements of Comprehensive Income (in thousands) For the Three Months Ended September 30, 2017 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Net income $ 101,534 $ 97,973 $ 105,214 $ (203,187 ) $ 101,534 Market value adjustments to interest rate swaps 148 148 — (148 ) 148 Comprehensive income $ 101,682 $ 98,121 $ 105,214 $ (203,335 ) $ 101,682 For the Three Months Ended September 30, 2016 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Net income $ 36,898 $ 29,656 $ 64,906 $ (94,562 ) $ 36,898 Market value adjustments to interest rate swaps 1,250 1,250 — (1,250 ) 1,250 Comprehensive income $ 38,148 $ 30,906 $ 64,906 $ (95,812 ) $ 38,148 For the Nine Months Ended September 30, 2017 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Net income $ 177,389 $ 165,030 $ 188,193 $ (353,223 ) $ 177,389 Market value adjustments to interest rate swaps 146 146 — (146 ) 146 Comprehensive income $ 177,535 $ 165,176 $ 188,193 $ (353,369 ) $ 177,535 For the Nine Months Ended September 30, 2016 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Net income $ 56,881 $ 33,162 $ 102,392 $ (135,554 ) $ 56,881 Market value adjustments to interest rate swaps (5,629 ) (5,629 ) — 5,629 (5,629 ) Comprehensive income (loss) $ 51,252 $ 27,533 $ 102,392 $ (129,925 ) $ 51,252 Consolidating Statements of Cash Flows (in thousands) For the Nine Months Ended September 30, 2017 Columbia Property Trust (Guarantor) Columbia Property Trust OP (the Issuer) Non- Guarantors Eliminations Columbia Property Trust Cash flows from operating activities $ 168,209 $ 151,932 $ 80,195 $ (353,221 ) $ 47,115 Cash flows from investing activities: Net proceeds from sale of real estate — 49,531 688,100 — 737,631 Investment in real estate and related assets (52,000 ) (630 ) (72,829 ) — (125,459 ) Investment in unconsolidated joint ventures — (123,149 ) — — (123,149 ) Distributions from unconsolidated joint ventures — 1,411 — — 1,411 Distributions from subsidiaries 237,835 330,939 — (568,774 ) — Net cash provided by investing activities 185,835 258,102 615,271 (568,774 ) 490,434 Cash flows from financing activities: Borrowings, net of fees — (628 ) — — (628 ) Repayments — — (201,625 ) — (201,625 ) Distributions (109,561 ) (409,115 ) (512,880 ) 921,995 (109,561 ) Repurchases of common stock (59,090 ) — — — (59,090 ) Net cash used in financing activities (168,651 ) (409,743 ) (714,505 ) 921,995 (370,904 ) Net increase (decrease) in cash and cash equivalents 185,393 291 (19,039 ) — 166,645 Cash and cash equivalents, beginning of period 174,420 16,509 25,156 — 216,085 Cash and cash equivalents, end of period $ 359,813 $ 16,800 $ 6,117 $ — $ 382,730 For the Nine Months Ended September 30, 2016 Columbia Property Trust (Guarantor) Columbia Property Trust OP (the Issuer) Non- Guarantors Eliminations Columbia Property Trust Cash flows from operating activities $ 33,797 $ 63,440 $ 188,021 $ (135,554 ) $ 149,704 Cash flows from investing activities: Net proceeds from sales of real estate (1) — — 482,089 — 482,089 Investment in real estate and related assets — (1,552 ) (52,608 ) — (54,160 ) Investment in unconsolidated joint ventures — (12,351 ) — — (12,351 ) Distributions from subsidiaries (2) 309,308 464,171 — (773,479 ) — Net cash provided by investing activities 309,308 450,268 429,481 (773,479 ) 415,578 Cash flows from financing activities: Debt prepayment and interest rate swap settlement costs paid (3) — (17,921 ) — — (17,921 ) Borrowings, net of fees (4) — 780,580 — — 780,580 Repayments (5) — (952,000 ) (43,070 ) — (995,070 ) Distributions (6) (148,474 ) (329,993 ) (579,040 ) 909,033 (148,474 ) Repurchases of common stock (26,186 ) — — — (26,186 ) Net cash used in financing activities (174,660 ) (519,334 ) (622,110 ) 909,033 (407,071 ) Net increase (decrease) in cash and cash equivalents 168,445 (5,626 ) (4,608 ) — 158,211 Cash and cash equivalents, beginning of period 989 14,969 16,687 — 32,645 Cash and cash equivalents, end of period $ 169,434 $ 9,343 $ 12,079 $ — $ 190,856 (1) Net proceeds from sales of real estate increased (decreased) by $(482.1) million and $482.1 million for the parent and non-guarantors, respectively. (2) Distributions from subsidiaries increased (decreased) by $309.3 million , $464.2 million , and $(773.5) million for the parent, issuer, and eliminations, respectively. (3) Debt prepayments and interest rate swap settlement costs paid increased (decreased) by $17.9 million and $(17.9) million for the parent and issuer, respectively. (4) Borrowings, net of fees increased (decreased) by $(348.7) million and $348.7 million for the parent and issuer, respectively. (5) Repayments increased (decreased) by $250.0 million and $(250.0) million for the parent and issuer, respectively. (6) Distributions (increased) decreased by $(330.0) million , $(579.0) million , and $909.0 million , for the 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	9 Months Ended
	Sep. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events 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 in addition to those disclosed elsewhere in this report: • Acquisition of 245-249 West 17th Street & 218 West 18th Street, as described in Note 3, Real Estate Transactions ; and • Acquisition of investment in 1800 M Street through a joint venture, as described in Note 3, Real Estate Transactions .

Summary of Significant Accoun22

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2017
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
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 construction, 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. Estimated fair values are calculated based on the following hierarchy of information, depending upon availability: (i) recently quoted market prices, (ii) market prices for comparable properties, or (iii) the present value of future cash flows, including estimated residual value. 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. 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 September 30, 2017 . 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.
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 the following criteria are met: • Management, having the authority to approve the action, commits to a plan to sell the property. • The property is available for immediate sale in its present condition subject only to terms that are usual and customary for sales of such property. • An active program to locate a buyer and other actions required to complete the plan to sell the property have been initiated. • The property is being actively marketed for sale at a price that is reasonable in relation to its current fair value. • Actions required to complete the plan indicate that it is unlikely that significant changes to the plan will be made or that the plan will be withdrawn. • The sale of the property is probable (i.e., typically subject to a binding sale contract with a non-refundable deposit), and transfer of the property is expected to qualify for recognition as a completed sale within one year. At such time that a property is determined to be 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; and assets and liabilities are required to be classified as held for sale on the accompanying consolidated balance sheet.
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 either as prepaid expenses and other assets or as accounts payable, accrued expenses, and accrued capital expenditures. Changes in the fair value of the effective portion of interest rate swaps that are designated as cash flow hedges are recorded as other comprehensive income, while changes in the fair value of the ineffective portion of a cash flow hedge, if any, are recognized currently in earnings. 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.
Prepaid Expenses and Other Assets	Prepaid Expenses and Other Assets Prepaid expenses are recognized over the period to which the good or service relates. Other assets are written off when the asset no longer has future value, or when the company is no longer obligated for the corresponding liability.
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 25% 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 August 2017, the Financial Accounting Standards Board (the "FASB") issued Accounting Standard Update 2017-12, Targeted Improvements to Accounting for Hedging Activities ("ASU 2017-12"). ASU 2017-12 aligns reporting requirements for hedging relationships with risk management activities and simplifies the application of hedge accounting. ASU 2017-12 eliminates the concept of recognizing periodic hedge ineffectiveness for cash flow hedges and allows for ongoing qualitative, rather than quantitative, testing of hedge effectiveness. ASU 2017-12 will be effective for Columbia Property Trust on January 1, 2019, with early adoption permitted. Columbia Property Trust anticipates that the adoption of ASU 2017-12 will result in a simplified process to determine the ongoing effectiveness of its cash flow hedge with no material impact on its consolidated financial statements or other disclosures. 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 will apply to the partial sale of non-financial assets, including real estate assets, to unconsolidated joint ventures. ASU 2017-05 will require 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 by recognizing a gain or loss on 100% of the asset transferred (i.e. to fully step-up the basis of our residual investment in the joint venture). This ASU will apply to Columbia Property Trust's partial sales of the following real estate assets: Market Square, 333 Market Street, and University Circle. We expect to implement ASU 2017-05 effective January 1, 2018 using the modified-retrospective approach by recording a cumulative-effect adjustment to equity, and are in the process of evaluating the impact to the financial statements. In January 2017, the FASB issued Accounting Standards Update 2017-01, Clarifying the Definition of a Business ("ASU 2017-01"), which provides a more narrow definition of a business to be used in determining the accounting treatment of acquisitions. As a result, under the new standard, many acquisitions that previously qualified as business combinations will be treated as asset acquisitions. For asset acquisitions, unlike business combinations, transaction costs may be capitalized, and purchase price may be allocated on a relative fair-value basis. Columbia Property Trust expects the adoption of ASU 2017-01 to simplify purchase price allocations for future acquisitions. ASU 2017-01 is effective for Columbia Property Trust prospectively on January 1, 2018, with early adoption permitted. Columbia Property Trust plans to adopt ASU 2017-01 in the fourth quarter of 2017, in connection with the acquisition of 245-249 West 17th Street and 218 West 18th Street. 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, including the classification of lease components and nonlease components, such as services provided to tenants. 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. Once effective, Columbia Property Trust anticipates separating lease components from nonlease components, which will be evaluated under ASU 2014-09, as described below. 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 will require companies to perform a five-step analysis of transactions to determine when and how revenue is recognized. Columbia Property Trust expects that the new standard to apply primarily to fees earned from managing properties owned by its unconsolidated joint ventures. Given the structure of the asset and property management agreements currently in place with our unconsolidated joint ventures, we do not expect the ASU to materially impact the timing or amount of our revenues; however, we will be required to provide more extensive disclosures about our revenue streams and contracts with customers. ASU 2014-09 is effective for Columbia Property Trust on January 1, 2018, with early adoption permitted.

Summary of Significant Accoun23

Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2017
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 Major Assets and Liabilities Classified as Held for Sale	The major classes of assets and liabilities classified as held for sale as of December 31, 2016 , are provided below (in thousands): December 31, 2016 Real estate assets held for sale: Real estate assets, at cost: Land $ 30,243 Buildings and improvements, less accumulated depreciation of $152,246 366,126 Intangible lease assets, less accumulated amortization of $28,545 13,365 Construction in progress 2,772 Total real estate assets held for sale, net $ 412,506 Other assets held for sale: Tenant receivables, net of allowance for doubtful accounts $ 1,722 Straight-line rent receivable 20,221 Prepaid expenses and other assets 3,184 Intangible lease origination costs, less accumulated amortization of $22,949 1,815 Deferred lease costs, less accumulated amortization of $11,203 18,587 Total other assets held for sale, net $ 45,529 Liabilities held for sale: Accounts payable, accrued expenses, and accrued capital expenditures $ 34,812 Deferred income 4,214 Intangible lease liabilities, less accumulated amortization of $1,239 2,737 Total liabilities held for sale, net $ 41,763 During 2016 and 2017 , Columbia Property Trust sold the following properties: Property Location Date Sales Price (1) (in thousands) Gain (Loss) on Sale (in thousands) 2017 University Circle & 333 Market Street (2) San Francisco, CA July 6, 2017 $ 234,000 $ 102,365 Key Center Tower & Marriott (3) Cleveland, OH January 31, 2017 $ 267,500 $ 9,500 Houston Properties (4) Houston, TX January 6, 2017 $ 272,000 $ 63,700 2016 SanTan Corporate Center Phoenix, AZ December 15, 2016 $ 58,500 $ 9,800 Sterling Commerce Dallas, TX November 30, 2016 $ 51,000 $ 12,500 9127 South Jamaica Street Denver, CO October 12, 2016 $ 19,500 $ — (5) 80 Park Plaza Newark, NJ September 30, 2016 $ 174,500 $ 21,600 9189, 9191 & 9193 South Jamaica Street Denver, CO September 22, 2016 $ 122,000 $ 27,200 800 North Frederick Suburban, MD July 8, 2016 $ 48,000 $ 2,100 100 East Pratt Baltimore, MD March 31, 2016 $ 187,000 $ (300 ) (1) Exclusive of transaction costs and price adjustments. (2) 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 Real Estate ("Allianz"), an unrelated third party (collectively, the "San Francisco Joint Ventures"). Upon the earlier of July 6, 2018, or when Columbia Property Trust and Allianz jointly invest $600.0 million in additional assets acquisitions (excluding the 114 Fifth Avenue building described above), Allianz will acquire another 22.5% interest in each of the San Francisco Joint Ventures at the same aggregate price, $234.0 million , adjusted for any capital expenditures made during the intervening period at the properties. The $600.0 million investment hurdle has been reduced by the aggregate adjusted purchase price for the 1800 M Street acquisition described above. (3) 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 net income of $9.6 million for the first nine months of 2016, and a net loss of $1.9 million for the first 31 days of 2017, excluding the gain on sale. (4) 5 Houston Center, Energy Center I, and 515 Post Oak were sold in one transaction. These properties generated net income of $10.8 million for the first nine months of 2016, and a net loss of $14.9 thousand for the first six days of 2017, excluding the gain on sale. (5) Columbia Property Trust recorded a de minimus loss on the sale of 9127 South Jamaica Street.
Schedule of Intangible Assets and Liabilities	As of September 30, 2017 and December 31, 2016 , Columbia Property Trust had the following intangible in-place lease assets and liabilities, 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 September 30, 2017 Gross $ 1,588 $ 112,145 $ 83,599 $ 29,328 Accumulated Amortization (784 ) (67,035 ) (55,532 ) (19,437 ) Net $ 804 $ 45,110 $ 28,067 $ 9,891 December 31, 2016 Gross $ 10,589 $ 154,582 $ 128,857 $ 77,939 Accumulated Amortization (9,305 ) (83,254 ) (74,578 ) (44,564 ) Net $ 1,284 $ 71,328 $ 54,279 $ 33,375 For the three and nine months ended September 30, 2017 and 2016 , 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 September 30, 2017 $ 22 $ 3,268 $ 1,957 $ 1,006 For the three months ended September 30, 2016 $ 594 $ 6,133 $ 3,757 $ 2,768 For the nine months ended September 30, 2017 $ 471 $ 12,525 $ 7,786 $ 5,322 For the nine months ended September 30, 2016 $ 2,014 $ 22,602 $ 13,811 $ 10,206 The net intangible assets and liabilities remaining as of September 30, 2017 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 2017 $ 22 $ 2,936 $ 1,875 $ 898 For the years ending December 31: 2018 89 11,083 7,315 3,278 2019 89 9,800 7,024 3,128 2020 89 7,880 5,979 1,992 2021 89 4,043 2,057 327 2022 89 2,664 1,079 94 Thereafter 337 6,704 2,738 174 $ 804 $ 45,110 $ 28,067 $ 9,891
Schedule of Future Amortization Expense for Remaining Net Below-Market Lease Assets	As of September 30, 2017 , the remaining net below-market intangible lease assets will be amortized as follows (in thousands): For the remainder of 2017 $ 637 For the years ending December 31: 2018 2,549 2019 2,549 2020 2,549 2021 2,549 2022 2,549 Thereafter 105,403 $ 118,785
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 September 30, December 31, Derivatives designated as hedging instruments: Interest rate contracts Accounts payable $ (737 ) $ (882 )
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position	Three Months Ended Nine Months Ended 2017 2016 2017 2016 Market value adjustment to interest rate swaps designated as hedging instruments and included in other comprehensive income $ 148 $ 1,250 $ 146 $ (5,629 )

Real Estate Transactions (Table

Real Estate Transactions (Tables)	9 Months Ended
	Sep. 30, 2017
Real Estate [Abstract]
Schedule of Properties Acquired	During 2016 and 2017, Columbia Property Trust acquired the following properties and partial interests in properties: Property Location Date Percent Acquired Purchase Price (in thousands) (1) 1800 M Street (2) Washington, D.C. October 11, 2017 55.0 % $ 231,550 245-249 West 17th Street & 218 West 18th Street (3) New York, NY October 11, 2017 100.0 % $ 514,100 114 Fifth Avenue (4) New York, NY July 6, 2017 49.5 % $ 108,900 (1) Exclusive of transaction costs and price adjustments. (2) On October 11, 2017, Columbia Property Trust entered a new joint venture partnership with Allianz Real Estate ("Allianz"), which simultaneously acquired 1800 M Street, a 10 -story, 581,000 -square-foot office building in Washington, D.C., that is 94% leased, for a total of $421.0 million (the “1800 M Street Joint Venture”). Columbia Property Trust owns a 55% interest in the 1800 M Street Joint Venture, and Allianz owns the remaining 45% . As of September 30, 2017, Columbia Property Trust had deposited $15.0 million in earnest money related to 1800 M Street, which is included in prepaid expenses and other assets on the accompanying consolidated balance sheet. (3) 245-249 West 17th Street is made up of two interconnected 12- and 6-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. The buildings are located in New York, 100% leased, and unencumbered by debt. As of September 30, 2017, Columbia Property Trust had deposited $25.0 million in earnest money related to this transaction, which is included in prepaid expenses and other assets on the accompanying consolidated balance sheet. (4) 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 is 100% leased, 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 will continue to perform asset and property management services for the property.
Schedule of Properties Sold	The major classes of assets and liabilities classified as held for sale as of December 31, 2016 , are provided below (in thousands): December 31, 2016 Real estate assets held for sale: Real estate assets, at cost: Land $ 30,243 Buildings and improvements, less accumulated depreciation of $152,246 366,126 Intangible lease assets, less accumulated amortization of $28,545 13,365 Construction in progress 2,772 Total real estate assets held for sale, net $ 412,506 Other assets held for sale: Tenant receivables, net of allowance for doubtful accounts $ 1,722 Straight-line rent receivable 20,221 Prepaid expenses and other assets 3,184 Intangible lease origination costs, less accumulated amortization of $22,949 1,815 Deferred lease costs, less accumulated amortization of $11,203 18,587 Total other assets held for sale, net $ 45,529 Liabilities held for sale: Accounts payable, accrued expenses, and accrued capital expenditures $ 34,812 Deferred income 4,214 Intangible lease liabilities, less accumulated amortization of $1,239 2,737 Total liabilities held for sale, net $ 41,763 During 2016 and 2017 , Columbia Property Trust sold the following properties: Property Location Date Sales Price (1) (in thousands) Gain (Loss) on Sale (in thousands) 2017 University Circle & 333 Market Street (2) San Francisco, CA July 6, 2017 $ 234,000 $ 102,365 Key Center Tower & Marriott (3) Cleveland, OH January 31, 2017 $ 267,500 $ 9,500 Houston Properties (4) Houston, TX January 6, 2017 $ 272,000 $ 63,700 2016 SanTan Corporate Center Phoenix, AZ December 15, 2016 $ 58,500 $ 9,800 Sterling Commerce Dallas, TX November 30, 2016 $ 51,000 $ 12,500 9127 South Jamaica Street Denver, CO October 12, 2016 $ 19,500 $ — (5) 80 Park Plaza Newark, NJ September 30, 2016 $ 174,500 $ 21,600 9189, 9191 & 9193 South Jamaica Street Denver, CO September 22, 2016 $ 122,000 $ 27,200 800 North Frederick Suburban, MD July 8, 2016 $ 48,000 $ 2,100 100 East Pratt Baltimore, MD March 31, 2016 $ 187,000 $ (300 ) (1) Exclusive of transaction costs and price adjustments. (2) 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 Real Estate ("Allianz"), an unrelated third party (collectively, the "San Francisco Joint Ventures"). Upon the earlier of July 6, 2018, or when Columbia Property Trust and Allianz jointly invest $600.0 million in additional assets acquisitions (excluding the 114 Fifth Avenue building described above), Allianz will acquire another 22.5% interest in each of the San Francisco Joint Ventures at the same aggregate price, $234.0 million , adjusted for any capital expenditures made during the intervening period at the properties. The $600.0 million investment hurdle has been reduced by the aggregate adjusted purchase price for the 1800 M Street acquisition described above. (3) 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 net income of $9.6 million for the first nine months of 2016, and a net loss of $1.9 million for the first 31 days of 2017, excluding the gain on sale. (4) 5 Houston Center, Energy Center I, and 515 Post Oak were sold in one transaction. These properties generated net income of $10.8 million for the first nine months of 2016, and a net loss of $14.9 thousand for the first six days of 2017, excluding the gain on sale. (5) Columbia Property Trust recorded a de minimus loss on the sale of 9127 South Jamaica Street.

Unconsolidated Joint Ventures (

Unconsolidated Joint Ventures (Tables)	9 Months Ended
	Sep. 30, 2017
Equity Method Investments and Joint Ventures [Abstract]
Summary of Financial Information for the Joint Ventures	As of September 30, 2017 , Columbia Property Trust owns interests in the following properties through joint ventures, which are accounted for using the equity method of accounting: Carrying Value of Investment Joint Venture Property Name Geographic Market Ownership Interest September 30, 2017 December 31, 2016 Market Square Joint Venture Market Square Washington, D.C. 51.0 % $ 126,638 $ 127,346 University Circle Joint Venture (1) University Circle San Francisco 77.5 % (2) 170,712 — 333 Market Street Joint Venture (1) 333 Market Street San Francisco 77.5 % (2) 288,405 — 114 Fifth Avenue Joint Venture (1) 114 Fifth Avenue New York 49.5 % 112,350 — $ 698,105 $ 127,346 (1) See Note 3, Real Estate Transactions, for a description of the formation of these joint ventures in the current period. (2) Upon the earlier of July 6, 2018, or when Columbia Property Trust and Allianz jointly invest $600.0 million in additional assets acquisitions (excluding 114 Fifth Avenue), Allianz will acquire 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% . The $600.0 million investment hurdle has been reduced by the aggregate adjusted purchase price for the 1800 M Street acquisition described in Note 3, Real Estate Transactions . During the three and nine months ended September 30, 2017 and 2016, Columbia Property Trust earned the following fees from these unconsolidated joint ventures: For the three months ended September 30, For the nine months ended September 30, 2017 2016 2017 2016 Market Square Joint Venture $ 496 $ 511 $ 1,468 $ 1,655 University Circle Joint Venture 480 — 480 — 333 Market Street Joint Venture 178 — 178 — $ 1,154 $ 511 $ 2,126 $ 1,655 Summarized balance sheet information for each of the unconsolidated joint ventures is as follows (in thousands): Total Assets Total Debt Total Equity September 30, 2017 December 31, 2016 September 30, 2017 December 31, 2016 September 30, 2017 December 31, 2016 Market Square Joint Venture $ 582,664 $ 587,344 $ 324,682 $ 324,656 $ 239,207 $ 242,802 University Circle Joint Venture 225,434 — — — 217,138 (1) — 333 Market Street Joint Venture 385,930 — — — 369,177 (1) — 114 Fifth Avenue Joint Venture 388,786 — — — 174,246 (1) — $ 1,582,814 $ 587,344 $ 324,682 $ 324,656 $ 999,768 $ 242,802 (1) There is an aggregate basis difference of $30.8 million related to the University Circle Joint Venture, the 333 Market Street Joint Venture and the 114 Fifth Avenue Joint Venture. Such difference represents the differences between the historical costs reflected at the joint venture level, and Columbia Property Trust's investment in the joint ventures. The basis differences result from the timing of each partner's acquisition of an interest in the joint venture and formation costs incurred by Columbia Property Trust, and will be amortized to income (loss) from unconsolidated joint ventures over the life of the related assets. Summarized income statement information for the unconsolidated joint ventures for the three months ended September 30, 2017 and September 30, 2016 is as follows (in thousands): Total Revenues Net Income (Loss) Columbia Property Trust's Share of Net Income (Loss) 2017 2016 2017 2016 2017 2016 Market Square Joint Venture $ 10,474 $ 9,787 $ (4,089 ) $ (3,799 ) $ (2,086 ) $ (1,937 ) University Circle Joint Venture 9,448 — 4,810 — 3,701 — 333 Market Street Joint Venture 6,306 — 3,381 — 2,593 — 114 Fifth Avenue Joint Venture 9,832 — (2,332 ) — (1,355 ) — $ 36,060 $ 9,787 $ 1,770 $ (3,799 ) $ 2,853 $ (1,937 ) Summarized income statement information for the unconsolidated joint ventures for the nine months ended September 30, 2017 and September 30, 2016 is as follows (in thousands): Total Revenues Net Income (Loss) Columbia Property Trust's Share of Net Income (Loss) 2017 2016 2017 2016 2017 2016 Market Square Joint Venture $ 31,036 $ 31,226 $ (11,348 ) $ (10,669 ) $ (5,788 ) $ (5,441 ) University Circle Joint Venture 9,448 — 4,810 — 3,701 — 333 Market Street Joint Venture 6,306 — 3,381 — 2,593 — 114 Fifth Avenue Joint Venture 9,832 — (2,332 ) — (1,355 ) — $ 56,622 $ 31,226 $ (5,489 ) $ (10,669 ) $ (849 ) $ (5,441 )

Line of Credit and Notes Paya26

Line of Credit and Notes Payable (Tables)	9 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Schedule of Line of Credit and Notes Payable Indebtedness	As of September 30, 2017 and December 31, 2016 , Columbia Property Trust had the following line of credit and notes payable indebtedness (excluding bonds payable; see Note 6, Bonds Payable ) in thousands: Facility September 30, December 31, $300 Million Term Loan $ 300,000 $ 300,000 $150 Million Term Loan 150,000 150,000 263 Shuman Boulevard building mortgage note (1) 49,000 49,000 One Glenlake building mortgage note 23,978 26,315 650 California Street building mortgage note — 126,287 221 Main Street building mortgage note — 73,000 Revolving Credit Facility — — Less: Deferred financing costs related to term loans and notes payable, net of accumulated amortization (2,611 ) (3,136 ) $ 520,367 $ 721,466 (1) The OfficeMax lease expired in May 2017, and the mortgage note matured in July 2017. Columbia Property Trust is working with the special-servicer to effect the transfer of the property to the lender in settlement of the loan principal, accrued interest expense and accrued property operating expenses. In the third quarter of 2017, Columbia Property Trust accrued related interest expense of $1.3 million at the default rate of 10.55% , and property operating expenses of $0.2 million , primarily related to property taxes.

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Summary of the Activity of Employee Stock Grants	A summary of the activity for the employee stock grants under the LTIP for the nine months ended September 30, 2017 follows: For the Nine Months Ended Shares Weighted-Average (1) Unvested shares – beginning of period 256 $ 22.62 Granted 664 $ 20.20 Vested (161 ) $ 22.67 Forfeited (9 ) $ 21.12 Unvested shares – end of period (2) 750 $ 20.48 (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 September 30, 2017 , we expect approximately 694,928 of the 750,000 unvested shares to ultimately vest, assuming a weighted average forfeiture rate of 4.7% , which was determined based on peer company data, adjusted for the specifics of the LTIP.
Summary of Shares Granted to Independent Directors	During the nine months ended September 30, 2017 and 2016 , Columbia Property Trust paid equity retainers to its independent directors under the LTIP by granting the following shares, all of which vested immediately: Date of Grant Shares Grant-Date Fair Value 2017 Director Grants: January 3, 2017 8,279 $ 21.58 May 2, 2017 33,581 (1) $ 22.57 2016 Director Grants: January 4, 2016 7,439 $ 23.00 April 1, 2016 8,120 $ 21.89 July 1, 2016 8,158 $ 21.52 (1) On May 2, 2017, the independent directors’ equity retainers were paid for the ensuing annual period. Prior to this time, the independent directors’ equity retainers were paid quarterly.
Schedule of Stock-based Compensation Expense Incurred	For the three and nine months ended September 30, 2017 and 2016 , Columbia Property Trust incurred the stock-based compensation expense related to the following events (in thousands): Three Months Ended Nine Months Ended 2017 2016 2017 2016 Amortization of LTIP awards $ 917 $ 650 $ 2,721 $ 2,190 Amortization of future LTIP awards (1) 639 91 1,851 797 Issuance of shares to independent directors — 176 937 525 Total stock-based compensation expense $ 1,556 $ 917 $ 5,509 $ 3,512 (1) Reflects amortization of LTIP awards for service during the current period, for which shares will be issued in future periods.

Supplemental Disclosures of N28

Supplemental Disclosures of Noncash Investing and Financing Activities (Tables)	9 Months Ended
	Sep. 30, 2017
Supplemental Cash Flow Elements [Abstract]
Significant Noncash Investing and Financing Activities	Outlined below are significant noncash investing and financing activities for the nine months ended September 30, 2017 and 2016 (in thousands): Nine Months Ended 2017 2016 Investments in real estate funded with other assets $ 311 $ 1,442 Real estate assets transferred to unconsolidated joint ventures $ 558,122 $ — Other assets transferred to unconsolidated joint ventures $ 43,670 $ — Other liabilities transferred to unconsolidated joint ventures $ 21,347 $ — Discount on issuance of bonds payable $ — $ 1,309 Deposits applied to sales of real estate $ 10,000 $ — Amortization of net discounts on debt $ 135 $ 222 Market value adjustments to interest rate swaps that qualify for hedge accounting treatment $ 146 $ (5,629 ) Accrued capital expenditures and deferred lease costs $ 25,866 $ 16,074 Accrued deferred financing costs $ — $ 12 Common stock issued to employees and directors, and amortized (net of income tax withholdings) $ 4,061 $ 2,339

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2017
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 and nine months ended September 30, 2017 and 2016 (in thousands): Three Months Ended Nine Months Ended 2017 2016 2017 2016 Net income $ 101,534 $ 36,898 $ 177,389 $ 56,881 Distributions paid on unvested shares (84 ) (77 ) (253 ) (237 ) Net income used to calculate basic and diluted earnings per share $ 101,450 $ 36,821 $ 177,136 $ 56,644 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 and nine months ended September 30, 2017 and 2016 , respectively (in thousands): Three Months Ended Nine Months Ended 2017 2016 2017 2016 Weighted-average common shares – basic 120,293 123,215 121,270 123,271 Plus incremental weighted-average shares from time-vested conversions, less assumed share repurchases: Previously granted LTIP awards, unvested 116 82 89 46 Future LTIP awards 120 53 99 31 Weighted-average common shares – diluted 120,529 123,350 121,458 123,348

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Reconciliation of Revenue from Segments to Consolidated	A reconciliation of GAAP revenues to operating revenues is presented below (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 Total revenues $ 60,362 $ 113,266 $ 217,375 $ 367,775 Operating revenues included in income (loss) from unconsolidated joint ventures (1) 22,419 4,992 32,905 15,926 Asset and property management fee income (2) (1,154 ) (511 ) (2,126 ) (1,655 ) Total operating revenues $ 81,627 $ 117,747 $ 248,154 $ 382,046 (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 operating revenues included in NOI by geographic reportable segment (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 New York (1) $ 30,488 $ 23,996 $ 83,598 $ 89,683 San Francisco (2) 25,337 26,407 80,112 82,310 Atlanta 9,401 9,192 28,239 27,625 Washington, D.C. (3) 8,494 7,689 23,622 25,602 Boston 2,734 2,879 8,358 8,782 Los Angeles 1,899 1,635 5,534 5,526 All other office markets 2,772 39,558 17,219 124,383 Total office segments 81,125 111,356 246,682 363,911 Hotel (24 ) 6,343 1,199 17,705 Corporate 526 48 273 430 Total operating revenues $ 81,627 $ 117,747 $ 248,154 $ 382,046 (1) Includes operating revenues for 49.5% of 114 Fifth Avenue based on our ownership interest, from July 6, 2017 through September 30, 2017, which are included in equity in income (loss) of unconsolidated joint ventures in the accompanying consolidated statements of operations. (2) Includes operating revenues for 100.0% of 333 Market Street and University Circle through July 5, 2017. Includes operating revenues for 77.5% of 333 Market Street and University Circle based on our ownership interest, from July 6, 2017 through September 30, 2017, which are included in equity in income (loss) of unconsolidated joint ventures in the accompanying consolidated statements of operations. (3) Includes operating revenues for 51.0% of the Market Square buildings based on our ownership interest, for all periods presented.
Schedule of Segment Reporting Information, by Segment	The following table presents NOI by geographic reportable segment (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 New York (1) $ 16,536 $ 11,380 $ 50,411 $ 52,515 San Francisco (2) 18,166 20,095 57,733 60,547 Atlanta 8,500 8,249 25,078 24,756 Washington, D.C. (3) 4,209 3,632 11,052 13,303 Boston 1,196 1,425 3,797 4,111 Los Angeles 1,155 894 3,439 3,336 All other office markets 4,071 23,723 15,598 76,111 Total office segments 53,833 69,398 167,108 234,679 Hotel (24 ) 1,301 (914 ) 3,171 Corporate (364 ) (59 ) (489 ) (137 ) Total $ 53,445 $ 70,640 $ 165,705 $ 237,713 (1) Includes NOI for 49.5% of 114 Fifth Avenue based on our ownership interest, from July 6, 2017 through September 30, 2017, which is included in equity in income (loss) of unconsolidated joint ventures in the accompanying consolidated statements of income. (2) Includes NOI for 100.0% of 333 Market Street and University Circle through July 5, 2017. Includes NOI for 77.5% of 333 Market Street and University Circle based on our ownership interest, from July 6, 2017 through September 30, 2017, which is included in equity in income (loss) of unconsolidated joint ventures in the accompanying consolidated statements of income. (3) Includes NOI for 51.0% of the Market Square buildings based on our ownership interest, for all periods presented. A reconciliation of GAAP net income to NOI is presented below (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 Net income $ 101,534 $ 36,898 $ 177,389 $ 56,881 Depreciation 18,501 26,778 60,529 84,517 Amortization 6,870 11,895 24,518 42,902 General and administrative - corporate 7,034 7,467 25,003 25,718 General and administrative - joint ventures 713 — 713 — Net interest expense 13,690 17,116 42,040 52,380 Interest income from development authority bonds (1,800 ) (1,800 ) (5,400 ) (5,400 ) Loss on early extinguishment of debt 280 18,905 325 18,997 Income tax expense (benefit) 3 65 (378 ) 387 Asset and property management fee income (1,154 ) (511 ) (2,126 ) (1,655 ) Adjustments included in income (loss) from unconsolidated joint ventures 10,139 4,239 18,610 13,069 Gain on sales of real estate assets (102,365 ) (50,412 ) (175,518 ) (50,083 ) NOI $ 53,445 $ 70,640 $ 165,705 $ 237,713

Financial Information for Par31

Financial Information for Parent Guarantor, Issuer Subsidiary, and Non-Guarantor Subsidiaries (Tables)	9 Months Ended
	Sep. 30, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Consolidating Balance Sheets	Condensed Consolidating Balance Sheets (in thousands) As of September 30, 2017 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Assets: Real estate assets, at cost: Land $ — $ — $ 609,110 $ — $ 609,110 Buildings and improvements, net — 58 1,704,572 — 1,704,630 Intangible lease assets, net — — 164,699 — 164,699 Construction in progress — — 49,255 — 49,255 Total real estate assets — 58 2,527,636 — 2,527,694 Investment in unconsolidated joint ventures — 698,105 — — 698,105 Cash and cash equivalents 359,813 16,800 6,117 — 382,730 Investment in subsidiaries 1,824,737 1,007,852 — (2,832,589 ) — Tenant receivables, net of allowance — 31 2,783 — 2,814 Straight-line rent receivable — — 80,128 — 80,128 Prepaid expenses and other assets 369,358 123,064 15,735 (432,355 ) 75,802 Intangible lease origination costs, net — — 28,067 — 28,067 Deferred lease costs, net — — 127,940 — 127,940 Investment in development authority bonds — — 120,000 — 120,000 Total assets $ 2,553,908 $ 1,845,910 $ 2,908,406 $ (3,264,944 ) $ 4,043,280 Liabilities: Line of credit and notes payable, net $ — $ 447,588 $ 503,542 $ (430,763 ) $ 520,367 Bonds payable, net — 693,562 — — 693,562 Accounts payable, accrued expenses, and accrued capital expenditures 2 11,049 118,751 — 129,802 Due to affiliates — — 1,592 (1,592 ) — Deferred income 4 81 15,671 — 15,756 Intangible lease liabilities, net — — 9,891 — 9,891 Obligations under capital lease — — 120,000 — 120,000 Total liabilities 6 1,152,280 769,447 (432,355 ) 1,489,378 Equity: Total equity 2,553,902 693,630 2,138,959 (2,832,589 ) 2,553,902 Total liabilities and equity $ 2,553,908 $ 1,845,910 $ 2,908,406 $ (3,264,944 ) $ 4,043,280 Condensed Consolidating Balance Sheets (in thousands) As of December 31, 2016 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Assets: Real estate assets, at cost: Land $ — $ — $ 751,351 $ — $ 751,351 Building and improvements, net — 219 2,120,931 — 2,121,150 Intangible lease assets, net — — 193,311 — 193,311 Construction in progress — — 36,188 — 36,188 Real estate assets held for sale, net — 34,956 377,550 — 412,506 Total real estate assets — 35,175 3,479,331 — 3,514,506 Investment in unconsolidated joint ventures — 127,346 — — 127,346 Cash and cash equivalents 174,420 16,509 25,156 — 216,085 Investment in subsidiaries 2,047,922 1,782,752 — (3,830,674 ) — Tenant receivables, net of allowance — — 7,163 — 7,163 Straight-line rent receivable — — 64,811 — 64,811 Prepaid expenses and other assets 317,153 262,216 15,593 (570,687 ) 24,275 Intangible lease origination costs, net — — 54,279 — 54,279 Deferred lease costs, net — — 125,799 — 125,799 Investment in development authority bonds — — 120,000 — 120,000 Other assets held for sale, net — 3,767 41,814 (52 ) 45,529 Total assets $ 2,539,495 $ 2,227,765 $ 3,933,946 $ (4,401,413 ) $ 4,299,793 Liabilities: Lines of credit and notes payable, net $ — $ 447,643 $ 704,585 $ (430,762 ) $ 721,466 Bonds payable, net — 692,972 — — 692,972 Accounts payable, accrued expenses, and accrued capital expenditures — 10,395 120,633 — 131,028 Dividends payable 36,727 — — — 36,727 Due to affiliates — 58 1,534 (1,592 ) — Deferred income — — 19,694 — 19,694 Intangible lease liabilities, net — — 33,375 — 33,375 Obligations under capital leases — — 120,000 — 120,000 Liabilities held for sale — 2,651 177,497 (138,385 ) 41,763 Total liabilities 36,727 1,153,719 1,177,318 (570,739 ) 1,797,025 Equity: Total equity 2,502,768 1,074,046 2,756,628 (3,830,674 ) 2,502,768 Total liabilities and equity $ 2,539,495 $ 2,227,765 $ 3,933,946 $ (4,401,413 ) $ 4,299,793
Consolidating Statements of Operations	Consolidating Statements of Operations (in thousands) For the Three Months Ended September 30, 2017 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Revenues: Rental income $ — $ — $ 55,113 $ (98 ) $ 55,015 Tenant reimbursements — 7 3,046 — 3,053 Asset and property management fee income 569 — 585 — 1,154 Other property income — — 1,140 — 1,140 569 7 59,884 (98 ) 60,362 Expenses: Property operating costs — 113 18,552 (98 ) 18,567 Asset and property management fees — — 188 — 188 Depreciation — 310 18,191 — 18,501 Amortization — — 6,870 — 6,870 General and administrative - corporate 39 1,758 5,237 — 7,034 General and administrative - unconsolidated joint ventures — — 713 — 713 39 2,181 49,751 (98 ) 51,873 Real estate operating income (loss) 530 (2,174 ) 10,133 — 8,489 Other income (expense): Interest expense — (10,702 ) (8,803 ) 4,774 (14,731 ) Interest and other income 4,593 1,220 1,802 (4,774 ) 2,841 Loss on early extinguishment of debt — — (280 ) — (280 ) 4,593 (9,482 ) (7,281 ) — (12,170 ) Income (loss) before income taxes and unconsolidated entities: 5,123 (11,656 ) 2,852 — (3,681 ) Income tax expense — (1 ) (2 ) — (3 ) Income (loss) from unconsolidated entities 96,411 109,630 (1 ) (203,187 ) 2,853 Income (loss) before sales of real estate assets: 101,534 97,973 2,849 (203,187 ) (831 ) Gain on sales of real estate assets — — 102,365 — 102,365 Net income $ 101,534 $ 97,973 $ 105,214 $ (203,187 ) $ 101,534 Consolidating Statements of Operations (in thousands) For the Three Months Ended September 30, 2016 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Revenues: Rental income $ — $ 956 $ 86,702 $ (97 ) $ 87,561 Tenant reimbursements — 564 16,526 — 17,090 Hotel income — — 6,270 — 6,270 Asset and property management fee income 245 — 266 — 511 Other property income — — 1,930 (96 ) 1,834 245 1,520 111,694 (193 ) 113,266 Expenses: Property operating costs — 860 38,338 (97 ) 39,101 Hotel operating costs — — 4,946 — 4,946 Asset and property management fee expenses: Related-party — 40 — (40 ) — Other — — 387 — 387 Depreciation — 745 26,033 — 26,778 Amortization — 86 11,809 — 11,895 General and administrative - corporate 38 2,297 5,188 (56 ) 7,467 38 4,028 86,701 (193 ) 90,574 Real estate operating income (loss) 207 (2,508 ) 24,993 — 22,692 Other income (expense): Interest expense — (12,249 ) (12,256 ) 7,367 (17,138 ) Interest and other income 3,571 3,813 1,822 (7,367 ) 1,839 Loss on early extinguishment of debt — (18,905 ) — — (18,905 ) 3,571 (27,341 ) (10,434 ) — (34,204 ) Income (loss) before income taxes and unconsolidated entities: 3,778 (29,849 ) 14,559 — (11,512 ) Income tax expense — — (65 ) — (65 ) Income from subsidiaries 33,120 61,442 — (94,562 ) — Loss from unconsolidated joint venture — (1,937 ) — — (1,937 ) Income (loss) before sale of real estate assets: 36,898 29,656 14,494 (94,562 ) (13,514 ) Gain on sale of real estate assets — — 50,412 — 50,412 Net income $ 36,898 $ 29,656 $ 64,906 $ (94,562 ) $ 36,898 Consolidating Statements of Operations (in thousands) For the Nine Months Ended September 30, 2017 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Revenues: Rental income $ — $ 51 $ 193,551 $ (293 ) $ 193,309 Tenant reimbursements — (59 ) 18,668 — 18,609 Hotel income — — 1,339 — 1,339 Asset and property management fee income 1,059 — 1,067 — 2,126 Other property income — — 2,010 (18 ) 1,992 1,059 (8 ) 216,635 (311 ) 217,375 Expenses: Property operating costs — 241 64,555 (293 ) 64,503 Hotel operating costs — — 2,085 — 2,085 Asset and property management fee expenses: Related-party — 3 — (3 ) — Other — — 717 — 717 Depreciation — 544 59,985 — 60,529 Amortization — 5 24,513 — 24,518 General and administrative - corporate 135 7,013 17,870 (15 ) 25,003 General and administrative - unconsolidated joint ventures — — 713 — 713 135 7,806 170,438 (311 ) 178,068 Real estate operating income (loss) 924 (7,814 ) 46,197 — 39,307 Other income (expense): Interest expense — (31,554 ) (27,935 ) 15,181 (44,308 ) Interest and other income 12,923 4,517 5,409 (15,181 ) 7,668 Loss on early extinguishment of debt — — (325 ) — (325 ) 12,923 (27,037 ) (22,851 ) — (36,965 ) Income (loss) before income taxes, unconsolidated entities, and sales of 13,847 (34,851 ) 23,346 — 2,342 Income tax benefit (expense) — (1 ) 379 — 378 Income (loss) from unconsolidated entities 163,542 188,832 — (353,223 ) (849 ) Income before sales of real estate assets: 177,389 153,980 23,725 (353,223 ) 1,871 Gains on sales of real estate assets — 11,050 164,468 — 175,518 Net income $ 177,389 $ 165,030 $ 188,193 $ (353,223 ) $ 177,389 For the Nine Months Ended September 30, 2016 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Revenues: Rental income $ — $ 2,669 $ 278,330 $ (285 ) $ 280,714 Tenant reimbursements — 1,421 54,130 — 55,551 Hotel income — — 17,484 — 17,484 Asset and property management fee income 735 — 920 — 1,655 Other property income — — 12,651 (280 ) 12,371 735 4,090 363,515 (565 ) 367,775 Expenses: Property operating costs — 2,360 118,604 (285 ) 120,679 Hotel operating costs — — 14,315 — 14,315 Asset and property management fee expenses: Related-party — 112 — (112 ) — Other — — 1,058 — 1,058 Depreciation — 2,166 82,351 — 84,517 Amortization — 239 42,663 — 42,902 General and administrative - corporate 116 6,575 19,195 (168 ) 25,718 116 11,452 278,186 (565 ) 289,189 Real estate operating income (loss) 619 (7,362 ) 85,329 — 78,586 Other income (expense): Interest expense — (36,479 ) (38,071 ) 22,135 (52,415 ) Interest and other income 10,680 11,471 5,436 (22,135 ) 5,452 Loss on early extinguishment of debt — (18,987 ) (10 ) — (18,997 ) 10,680 (43,995 ) (32,645 ) — (65,960 ) Income (loss) before income taxes, unconsolidated entities, and sales of 11,299 (51,357 ) 52,684 — 12,626 Income tax expense — (12 ) (375 ) — (387 ) Income from unconsolidated entities 45,582 89,972 — (135,554 ) — Loss from unconsolidated joint venture — (5,441 ) — — (5,441 ) Income before sales of real estate assets: 56,881 33,162 52,309 (135,554 ) 6,798 Gain on sales of real estate assets — — 50,083 — 50,083 Net income $ 56,881 $ 33,162 $ 102,392 $ (135,554 ) $ 56,881
Consolidating Statements of Comprehensive Income	Consolidating Statements of Comprehensive Income (in thousands) For the Three Months Ended September 30, 2017 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Net income $ 101,534 $ 97,973 $ 105,214 $ (203,187 ) $ 101,534 Market value adjustments to interest rate swaps 148 148 — (148 ) 148 Comprehensive income $ 101,682 $ 98,121 $ 105,214 $ (203,335 ) $ 101,682 For the Three Months Ended September 30, 2016 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Net income $ 36,898 $ 29,656 $ 64,906 $ (94,562 ) $ 36,898 Market value adjustments to interest rate swaps 1,250 1,250 — (1,250 ) 1,250 Comprehensive income $ 38,148 $ 30,906 $ 64,906 $ (95,812 ) $ 38,148 For the Nine Months Ended September 30, 2017 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Net income $ 177,389 $ 165,030 $ 188,193 $ (353,223 ) $ 177,389 Market value adjustments to interest rate swaps 146 146 — (146 ) 146 Comprehensive income $ 177,535 $ 165,176 $ 188,193 $ (353,369 ) $ 177,535 For the Nine Months Ended September 30, 2016 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating Adjustments Columbia Property Trust Net income $ 56,881 $ 33,162 $ 102,392 $ (135,554 ) $ 56,881 Market value adjustments to interest rate swaps (5,629 ) (5,629 ) — 5,629 (5,629 ) Comprehensive income (loss) $ 51,252 $ 27,533 $ 102,392 $ (129,925 ) $ 51,252
Consolidating Statements of Cash Flows	Consolidating Statements of Cash Flows (in thousands) For the Nine Months Ended September 30, 2017 Columbia Property Trust (Guarantor) Columbia Property Trust OP (the Issuer) Non- Guarantors Eliminations Columbia Property Trust Cash flows from operating activities $ 168,209 $ 151,932 $ 80,195 $ (353,221 ) $ 47,115 Cash flows from investing activities: Net proceeds from sale of real estate — 49,531 688,100 — 737,631 Investment in real estate and related assets (52,000 ) (630 ) (72,829 ) — (125,459 ) Investment in unconsolidated joint ventures — (123,149 ) — — (123,149 ) Distributions from unconsolidated joint ventures — 1,411 — — 1,411 Distributions from subsidiaries 237,835 330,939 — (568,774 ) — Net cash provided by investing activities 185,835 258,102 615,271 (568,774 ) 490,434 Cash flows from financing activities: Borrowings, net of fees — (628 ) — — (628 ) Repayments — — (201,625 ) — (201,625 ) Distributions (109,561 ) (409,115 ) (512,880 ) 921,995 (109,561 ) Repurchases of common stock (59,090 ) — — — (59,090 ) Net cash used in financing activities (168,651 ) (409,743 ) (714,505 ) 921,995 (370,904 ) Net increase (decrease) in cash and cash equivalents 185,393 291 (19,039 ) — 166,645 Cash and cash equivalents, beginning of period 174,420 16,509 25,156 — 216,085 Cash and cash equivalents, end of period $ 359,813 $ 16,800 $ 6,117 $ — $ 382,730 For the Nine Months Ended September 30, 2016 Columbia Property Trust (Guarantor) Columbia Property Trust OP (the Issuer) Non- Guarantors Eliminations Columbia Property Trust Cash flows from operating activities $ 33,797 $ 63,440 $ 188,021 $ (135,554 ) $ 149,704 Cash flows from investing activities: Net proceeds from sales of real estate (1) — — 482,089 — 482,089 Investment in real estate and related assets — (1,552 ) (52,608 ) — (54,160 ) Investment in unconsolidated joint ventures — (12,351 ) — — (12,351 ) Distributions from subsidiaries (2) 309,308 464,171 — (773,479 ) — Net cash provided by investing activities 309,308 450,268 429,481 (773,479 ) 415,578 Cash flows from financing activities: Debt prepayment and interest rate swap settlement costs paid (3) — (17,921 ) — — (17,921 ) Borrowings, net of fees (4) — 780,580 — — 780,580 Repayments (5) — (952,000 ) (43,070 ) — (995,070 ) Distributions (6) (148,474 ) (329,993 ) (579,040 ) 909,033 (148,474 ) Repurchases of common stock (26,186 ) — — — (26,186 ) Net cash used in financing activities (174,660 ) (519,334 ) (622,110 ) 909,033 (407,071 ) Net increase (decrease) in cash and cash equivalents 168,445 (5,626 ) (4,608 ) — 158,211 Cash and cash equivalents, beginning of period 989 14,969 16,687 — 32,645 Cash and cash equivalents, end of period $ 169,434 $ 9,343 $ 12,079 $ — $ 190,856 (1) Net proceeds from sales of real estate increased (decreased) by $(482.1) million and $482.1 million for the parent and non-guarantors, respectively. (2) Distributions from subsidiaries increased (decreased) by $309.3 million , $464.2 million , and $(773.5) million for the parent, issuer, and eliminations, respectively. (3) Debt prepayments and interest rate swap settlement costs paid increased (decreased) by $17.9 million and $(17.9) million for the parent and issuer, respectively. (4) Borrowings, net of fees increased (decreased) by $(348.7) million and $348.7 million for the parent and issuer, respectively. (5) Repayments increased (decreased) by $250.0 million and $(250.0) million for the parent and issuer, respectively. (6) Distributions (increased) decreased by $(330.0) million , $(579.0) million , and $909.0 million , for the 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	Oct. 26, 2017property	Sep. 30, 2017ft²property
Real Estate Properties [Line Items]
Square feet of real estate | ft²		8.2
Percent of leased office space of owned properties		95.10%
Office Building
Real Estate Properties [Line Items]
Number of real estate properties		16
Wholly Owned Properties | Office Building
Real Estate Properties [Line Items]
Number of real estate properties		12
Unconsolidated Properties | Office Building
Real Estate Properties [Line Items]
Number of real estate properties		4
Subsequent Event | Corporate Joint Venture
Real Estate Properties [Line Items]
Ownership percentage	55.00%
Subsequent Event | Wholly Owned Properties | Office Building
Real Estate Properties [Line Items]
Number of real estate properties	2

Summary of Significant Accoun33

Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 26, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Amortization of intangible assets				$ 24,115,000	$ 39,271,000
Hedge ineffectiveness recognized in earnings		$ 0	$ 0	$ 0	0
Requirement to distribute taxable income (at least)		90.00%		90.00%
Limit on investments in taxable real estate investment trusts (percent)		25.00%		25.00%
Intangible Below Market Lease Assets
Property, Plant and Equipment [Line Items]
Gross intangible assets		$ 140,900,000		$ 140,900,000		$ 140,900,000
Amortization of intangible assets		600,000	$ 600,000	$ 1,900,000	$ 1,900,000
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
Prepaid expenses and other assets
Property, Plant and Equipment [Line Items]
Earnest money deposits		$ 52,000,000		$ 52,000,000
Subsequent Event | Prepaid expenses and other assets
Property, Plant and Equipment [Line Items]
Earnest money deposits applied to purchase price transactions	$ 40,000,000

Summary of Significant Accoun34

Summary of Significant Accounting Policies (Major Classes of Assets and Liabilities Classified as Held For Sale) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Other assets held for sale:
Total other assets held for sale, net	$ 0	$ 45,529
Liabilities held for sale:
Total liabilities held for sale, net	$ 0	41,763
5 Houston Center, Energy Center I, 515 Post Oak, Key Center Tower and Key Center Marriott | Held-for-Sale
Real estate assets, at cost:
Land		30,243
Buildings and improvements, less accumulated depreciation of $152,246		366,126
Intangible lease assets, less accumulated amortization of $28,545		13,365
Construction in progress		2,772
Total real estate assets held for sale, net		412,506
Other assets held for sale:
Tenant receivables, net of allowance for doubtful accounts		1,722
Straight-line rent receivable		20,221
Prepaid expenses and other assets		3,184
Intangible lease origination costs, less accumulated amortization of $22,949		1,815
Deferred lease costs, less accumulated amortization of $11,203		18,587
Total other assets held for sale, net		45,529
Liabilities held for sale:
Accounts payable, accrued expenses, and accrued capital expenditures		34,812
Deferred income		4,214
Intangible lease liabilities, less accumulated amortization of $1,239		2,737
Total liabilities held for sale, net		41,763
Buildings and improvements, accumulated depreciation		152,246
Intangible lease assets, accumulated amortization		28,545
Intangible lease origination costs, accumulated amortization		22,949
Deferred lease costs, accumulated amortization		11,203
Intangible lease liabilities, accumulated amortization		$ 1,239

Summary of Significant Accoun35

Summary of Significant Accounting Policies (Schedule of Intangible Assets & Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Gross Intangible In-Place Lease Assets and Liabilities [Abstract]
Intangible Lease Assets, Accumulated Amortization	$ (89,950)	$ (112,777)
Intangible lease assets, net	164,699	193,311
Intangible Lease Origination Costs, Accumulated Amortization	(55,532)	(74,578)
Intangible Lease Origination Costs, Net	28,067	54,279
Below Market Lease, Gross	29,328	77,939
Below Market Lease, Accumulated Amortization	(19,437)	(44,564)
Below Market Lease, Net	9,891	33,375
Above-Market In-Place Lease Assets
Gross Intangible In-Place Lease Assets and Liabilities [Abstract]
Intangible Lease Assets, Gross	1,588	10,589
Intangible Lease Assets, Accumulated Amortization	(784)	(9,305)
Intangible lease assets, net	804	1,284
Absorption Period Costs
Gross Intangible In-Place Lease Assets and Liabilities [Abstract]
Intangible Lease Assets, Gross	112,145	154,582
Intangible Lease Assets, Accumulated Amortization	(67,035)	(83,254)
Intangible lease assets, net	45,110	71,328
Intangible Lease Origination Costs
Gross Intangible In-Place Lease Assets and Liabilities [Abstract]
Intangible Lease Origination Costs, Gross	83,599	128,857
Intangible Lease Origination Costs, Accumulated Amortization	(55,532)	(74,578)
Intangible Lease Origination Costs, Net	$ 28,067	$ 54,279

Summary of Significant Accoun36

Summary of Significant Accounting Policies (Schedule of Recognized Amortization) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Lease Assets	$ 6,870	$ 11,895	$ 24,518	$ 42,902
Intangible Below-Market In-Place Lease Liabilities	1,006	2,768	5,322	10,206
Above-Market In-Place Lease Assets
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Lease Assets	22	594	471	2,014
Absorption Period Costs
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Lease Assets	3,268	6,133	12,525	22,602
Intangible Lease Origination Costs
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Lease Assets	$ 1,957	$ 3,757	$ 7,786	$ 13,811

Summary of Significant Accoun37

Summary of Significant Accounting Policies (Schedule of Future Amortization by Intangible Asset Class) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
For the years ending December 31:
Intangible lease assets, net	$ 164,699	$ 193,311
Intangible Lease Origination Costs, Net	28,067	54,279
Intangible Below-Market In-Place Lease Liabilities
For the remainder of 2017	898
For the years ending December 31:
2,018	3,278
2,019	3,128
2,020	1,992
2,021	327
2,022	94
Thereafter	174
Below Market Lease, Net	9,891	33,375
Above-Market In-Place Lease Assets
Finite-Lived Intangible Assets [Line Items]
For the remainder of 2017	22
For the years ending December 31:
2,018	89
2,019	89
2,020	89
2,021	89
2,022	89
Thereafter	337
Intangible lease assets, net	804	1,284
Absorption Period Costs
Finite-Lived Intangible Assets [Line Items]
For the remainder of 2017	2,936
For the years ending December 31:
2,018	11,083
2,019	9,800
2,020	7,880
2,021	4,043
2,022	2,664
Thereafter	6,704
Intangible lease assets, net	45,110	71,328
Intangible Lease Origination Costs
Finite-Lived Intangible Assets [Line Items]
For the remainder of 2017	1,875
For the years ending December 31:
2,018	7,315
2,019	7,024
2,020	5,979
2,021	2,057
2,022	1,079
Thereafter	2,738
Intangible Lease Origination Costs, Net	$ 28,067	$ 54,279

Summary of Significant Accoun38

Summary of Significant Accounting Policies (Schedule of Future Amortization for Below-Market Lease Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
For the years ending December 31:
Intangible lease assets, net	$ 164,699	$ 193,311
Intangible below market ground lease assets
Finite-Lived Intangible Assets [Line Items]
For the remainder of 2017	637
For the years ending December 31:
2,018	2,549
2,019	2,549
2,020	2,549
2,021	2,549
2,022	2,549
Thereafter	105,403
Intangible lease assets, net	$ 118,785

Summary of Significant Accoun39

Summary of Significant Accounting Policies (Interest Rate Swaps) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
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	$ 148	$ 1,250	$ 146	$ (5,629)
Interest rate contracts | Accounts payable
Derivatives designated as hedging instruments:
Interest rate contracts	$ (737)		$ (737)		$ (882)

Real Estate Transactions (Acqui

Real Estate Transactions (Acquisitions) (Details) ft² in Thousands, $ in Thousands	Oct. 11, 2017USD ($)ft²	Jul. 06, 2017USD ($)ft²	Sep. 30, 2017USD ($)ft²	Sep. 30, 2016USD ($)	Feb. 28, 2017USD ($)ft²
Business Acquisition [Line Items]
Payments to Acquire Interest in Joint Venture			$ 123,149	$ 12,351
Square feet of real estate | ft²			8,200
245 - 249 West 17th Street & 218 West 18th Street
Business Acquisition [Line Items]
Earnest money deposits			$ 25,000
149 Madison Avenue
Business Acquisition [Line Items]
Earnest money deposits					$ 12,000
Office Building | 149 Madison Avenue
Business Acquisition [Line Items]
Square feet of real estate | ft²					127
Subsequent Event | 245 - 249 West 17th Street & 218 West 18th Street
Business Acquisition [Line Items]
Ownership percentage	100.00%
Payments to acquire real estate	$ 514,100
Subsequent Event | Office Building | 245 - 249 West 17th Street
Business Acquisition [Line Items]
Square feet of real estate | ft²	281
Subsequent Event | Office Building | 218 West 18th Street
Business Acquisition [Line Items]
Square feet of real estate | ft²	166
Percentage of buildings leased	100.00%
Corporate Joint Venture | 1800 M Street
Business Acquisition [Line Items]
Earnest money deposits			$ 15,000
Corporate Joint Venture | 114 Fifth Avenue Joint Venture
Business Acquisition [Line Items]
Ownership percentage		49.50%
Payments to Acquire Interest in Joint Venture		$ 108,900
Square feet of real estate | ft²		352
Percentage of buildings leased		100.00%
Corporate Joint Venture | Subsequent Event | 1800 M Street
Business Acquisition [Line Items]
Ownership percentage	55.00%
Payments to Acquire Interest in Joint Venture	$ 231,550
Investments in unconsolidated joint ventures	$ 421,000
Square feet of real estate | ft²	581
Percentage of buildings leased	94.00%
Corporate Joint Venture | Allianz | 114 Fifth Avenue Joint Venture
Business Acquisition [Line Items]
Ownership percentage		49.50%
Corporate Joint Venture | Allianz | Subsequent Event | 1800 M Street
Business Acquisition [Line Items]
Ownership percentage	45.00%
Corporate Joint Venture | L & L Holding Company | 114 Fifth Avenue Joint Venture
Business Acquisition [Line Items]
Ownership percentage		1.00%

Real Estate Transactions (Dispo

Real Estate Transactions (Dispositions) (Details) - USD ($)

Jul. 06, 2018

Jul. 06, 2017

Jan. 31, 2017

Jan. 06, 2017

Jan. 06, 2017

Dec. 15, 2016

Nov. 30, 2016

Oct. 12, 2016

Sep. 30, 2016

Sep. 22, 2016

Jul. 08, 2016

Mar. 31, 2016

Jan. 31, 2017

Sep. 30, 2016

Oct. 11, 2017

San Francisco Joint Ventures | Corporate Joint Venture | Allianz

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Ownership percentage

22.50%

Additional ownership percentage to be acquired

22.50%

Proceeds from sale of ownership in joint venture

$ 234,000,000

Subsequent Event | 1800 M Street | Corporate Joint Venture

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Ownership percentage

55.00%

Subsequent Event | 1800 M Street | Corporate Joint Venture | Allianz

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Ownership percentage

45.00%

Forecast | San Francisco Joint Ventures | Corporate Joint Venture

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Ownership percentage

55.00%

Forecast | San Francisco Joint Ventures | Corporate Joint Venture | Allianz and Columbia Property Trust

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Required amount of assets to be invested in less than one year to acquire additional interest in joint venture

$ 600,000,000

Forecast | Subsequent Event | San Francisco Joint Ventures | Corporate Joint Venture | Allianz

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Proceeds from sale of ownership in joint venture

$ 234,000,000

Disposed of by Sale | University Circle & 333 Market Street

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Gain (Loss) on Sale

$ 102,365,000

Disposed of by Sale | University Circle Joint Venture

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Ownership percentage

22.50%

Disposed of by Sale | 333 Market Street

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Ownership percentage

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]

Sales Price

$ 267,500,000

$ 267,500,000

Gain (Loss) on Sale

9,500,000

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

Income (loss) from disposal group

$ (1,900,000)

$ 9,600,000

Disposed of by Sale | Houston Properties

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Sales Price

$ 272,000,000

$ 272,000,000

Gain (Loss) on Sale

$ 63,700,000

Income (loss) from disposal group

$ (14,900)

10,800,000

Disposed of by Sale | SanTan Corporate Center

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Sales Price

$ 58,500,000

Gain (Loss) on Sale

$ 9,800,000

Disposed of by Sale | Sterling Commerce

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Sales Price

$ 51,000,000

Gain (Loss) on Sale

$ 12,500,000

Disposed of by Sale | 9127 South Jamaica Street

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Sales Price

$ 19,500,000

Gain (Loss) on Sale

$ 0

Disposed of by Sale | 80 Park Plaza

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Sales Price

$ 174,500,000

$ 174,500,000

Gain (Loss) on Sale

$ 21,600,000

Disposed of by Sale | 9189, 9191 & 9193 South Jamaica Street

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Sales Price

$ 122,000,000

Gain (Loss) on Sale

$ 27,200,000

Disposed of by Sale | 800 North Fredrick

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Sales Price

$ 48,000,000

Gain (Loss) on Sale

$ 2,100,000

Disposed of by Sale | 100 East Pratt

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Sales Price

$ 187,000,000

Gain (Loss) on Sale

$ (300,000)

Unconsolidated Joint Ventures42

Unconsolidated Joint Ventures (Details) - USD ($) $ in Thousands	Jul. 06, 2018	Sep. 30, 2017	Jul. 06, 2017	Dec. 31, 2016
Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Carrying Value of Investment		$ 698,105		$ 127,346
Corporate Joint Venture | Market Square Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership Interest		51.00%
Carrying Value of Investment		$ 126,638		127,346
Corporate Joint Venture | University Circle Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership Interest		77.50%	77.50%
Carrying Value of Investment		$ 170,712		0
Corporate Joint Venture | 333 Market Street Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership Interest		77.50%
Carrying Value of Investment		$ 288,405		0
Corporate Joint Venture | 114 Fifth Avenue Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership Interest		49.50%
Carrying Value of Investment		$ 112,350		$ 0
Corporate Joint Venture | 114 Fifth Avenue Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership Interest			49.50%
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]
Ownership Interest			22.50%
Additional ownership percentage to be acquired			22.50%
Forecast | Corporate Joint Venture | San Francisco Joint Ventures
Schedule of Equity Method Investments [Line Items]
Ownership Interest	55.00%
Forecast | Corporate Joint Venture | Allianz and Columbia Property Trust | San Francisco Joint Ventures
Schedule of Equity Method Investments [Line Items]
Required amount of assets to be invested in less than one year to acquire additional interest in joint venture	$ 600,000

Unconsolidated Joint Ventures43

Unconsolidated Joint Ventures (Narrative) (Details) - Corporate Joint Venture - Blackstone Property Partners - USD ($)	Sep. 30, 2017	Dec. 31, 2016	Oct. 31, 2015
Related Party Transaction [Line Items]
Mortgage note transferred to joint venture	$ 325,000,000	$ 325,000,000
Mortgage note interest rate	5.07%	5.07%
Guaranty liability	$ 11,200,000	$ 16,100,000	$ 25,000,000

Unconsolidated Joint Ventures44

Unconsolidated Joint Ventures (Condensed Balance Sheet Information for Joint Ventures) (Details) - Corporate Joint Venture - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Total assets	$ 1,582,814	$ 587,344
Total debt	324,682	324,656
Total equity	999,768	242,802
Market Square Joint Venture
Schedule of Equity Method Investments [Line Items]
Total assets	582,664	587,344
Total debt	324,682	324,656
Total equity	239,207	242,802
University Circle Joint Venture
Schedule of Equity Method Investments [Line Items]
Total assets	225,434	0
Total debt	0	0
Total equity	217,138	0
333 Market Street Joint Venture
Schedule of Equity Method Investments [Line Items]
Total assets	385,930	0
Total debt	0	0
Total equity	369,177	0
114 Fifth Avenue Joint Venture
Schedule of Equity Method Investments [Line Items]
Total assets	388,786	0
Total debt	0	0
Total equity	174,246	$ 0
University Circle, 333 Market Street Joint Venture and 114 Fifth Avenue Joint Ventures
Schedule of Equity Method Investments [Line Items]
Aggregate basis difference	$ 30,800

Unconsolidated Joint Ventures45

Unconsolidated Joint Ventures (Condensed Income Statement Information for the Joint Ventures) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Schedule of Equity Method Investments [Line Items]
Columbia Property Trust's Share of Net Income (Loss)	$ 2,853	$ (1,937)	$ (849)	$ (5,441)
Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Total revenues	36,060	9,787	56,622	31,226
Net Income (Loss)	1,770	(3,799)	(5,489)	(10,669)
Columbia Property Trust's Share of Net Income (Loss)	2,853	(1,937)	(849)	(5,441)
Corporate Joint Venture | Market Square Joint Venture
Schedule of Equity Method Investments [Line Items]
Total revenues	10,474	9,787	31,036	31,226
Net Income (Loss)	(4,089)	(3,799)	(11,348)	(10,669)
Columbia Property Trust's Share of Net Income (Loss)	(2,086)	(1,937)	(5,788)	(5,441)
Corporate Joint Venture | University Circle Joint Venture
Schedule of Equity Method Investments [Line Items]
Total revenues	9,448	0	9,448	0
Net Income (Loss)	4,810	0	4,810	0
Columbia Property Trust's Share of Net Income (Loss)	3,701	0	3,701	0
Corporate Joint Venture | 333 Market Street Joint Venture
Schedule of Equity Method Investments [Line Items]
Total revenues	6,306	0	6,306	0
Net Income (Loss)	3,381	0	3,381	0
Columbia Property Trust's Share of Net Income (Loss)	2,593	0	2,593	0
Corporate Joint Venture | 114 Fifth Avenue Joint Venture
Schedule of Equity Method Investments [Line Items]
Total revenues	9,832	0	9,832	0
Net Income (Loss)	(2,332)	0	(2,332)	0
Columbia Property Trust's Share of Net Income (Loss)	$ (1,355)	$ 0	$ (1,355)	$ 0

Unconsolidated Joint Ventures46

Unconsolidated Joint Ventures (Property and Asset Management Fees) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Asset and property management fee income	$ 1,154	$ 511	$ 2,126	$ 1,655
Other property income | Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Reimbursement revenue	900	100	1,200	400
Prepaid expenses and other assets | Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Property management fee receivable	300		300		$ 100
Market Square Joint Venture | Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Asset and property management fee income	496	511	1,468	1,655
University Circle Joint Venture | Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Asset and property management fee income	480	0	480	0
333 Market Street Joint Venture | Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Asset and property management fee income	$ 178	$ 0	$ 178	$ 0

Line of Credit and Notes Paya47

Line of Credit and Notes Payable (Schedule of Long-Term Debt (excluding Bonds Payable)) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Debt Instrument [Line Items]
Lines of credit and notes payable, net	$ 520,367,000		$ 520,367,000		$ 721,466,000
Less: Deferred financing costs related to term loans and notes payable, net of accumulated amortization	(2,611,000)		(2,611,000)		(3,136,000)
Property operating costs	18,567,000	$ 39,101,000	64,503,000	$ 120,679,000
Term Loans
Debt Instrument [Line Items]
Less: Deferred financing costs related to term loans and notes payable, net of accumulated amortization	(2,611,000)		(2,611,000)		(3,136,000)
Term Loans | $300 Million Term Loan
Debt Instrument [Line Items]
Lines of credit and notes payable, net	300,000,000		300,000,000		300,000,000
Face amount of issued debt instrument	300,000,000		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		150,000,000
Face amount of issued debt instrument	150,000,000		150,000,000		150,000,000
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		49,000,000
Interest expense	$ 1,300,000
Default interest rate	10.55%
Property operating costs	$ 200,000
Mortgage Notes | One Glenlake building mortgage note
Debt Instrument [Line Items]
Lines of credit and notes payable, net	23,978,000		23,978,000		26,315,000
Mortgage Notes | 650 California Street building mortgage note
Debt Instrument [Line Items]
Lines of credit and notes payable, net	0		0		126,287,000
Mortgage Notes | 221 Main Street building mortgage note
Debt Instrument [Line Items]
Lines of credit and notes payable, net	0		0		73,000,000
Credit Facilities | Revolving Credit Facility
Debt Instrument [Line Items]
Lines of credit and notes payable, net	$ 0		$ 0		$ 0

Line of Credit and Notes Paya48

Line of Credit and Notes Payable (Narrative) (Details) - USD ($)	Aug. 17, 2017	Jul. 25, 2017	Jul. 24, 2017	Mar. 10, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Debt Instrument [Line Items]
Loss on early extinguishment of debt					$ 280,000	$ 18,905,000	$ 325,000	$ 18,997,000
Line of credit and notes payable, net of unamortized deferred financing costs of $2,611 and $3,136, as of September 30, 2017 and December 31, 2016, respectively					520,367,000		520,367,000		$ 721,466,000
Loans Payable
Debt Instrument [Line Items]
Estimated fair value of line of credit and notes payable					524,200,000		524,200,000		728,500,000
Carrying value of the line of credit and notes payable					523,000,000		523,000,000		724,600,000
Interest payments							15,600,000	21,700,000
Interest capitalized							400,000	$ 200,000
Term Loans | $300 Million Term Loan
Debt Instrument [Line Items]
Face amount of issued debt instrument					300,000,000		300,000,000		300,000,000
Line of credit and notes payable, net of unamortized deferred financing costs of $2,611 and $3,136, as of September 30, 2017 and December 31, 2016, respectively					300,000,000		300,000,000		300,000,000
Term Loans | $150 Million Term Loan
Debt Instrument [Line Items]
Face amount of issued debt instrument					150,000,000		150,000,000		150,000,000
Line of credit and notes payable, net of unamortized deferred financing costs of $2,611 and $3,136, as of September 30, 2017 and December 31, 2016, respectively					150,000,000		150,000,000		150,000,000
Effective interest rate		3.07%	3.52%
Mortgages | 650 California Street building mortgage note
Debt Instrument [Line Items]
Repayment of debt	$ 124,800,000
Loss on early extinguishment of debt	$ 300,000
Line of credit and notes payable, net of unamortized deferred financing costs of $2,611 and $3,136, as of September 30, 2017 and December 31, 2016, respectively					0		0		126,287,000
Mortgages | 221 Main Street building mortgage note
Debt Instrument [Line Items]
Repayment of debt				$ 73,000,000
Loss on early extinguishment of debt				$ 45,000
Line of credit and notes payable, net of unamortized deferred financing costs of $2,611 and $3,136, as of September 30, 2017 and December 31, 2016, respectively					$ 0		$ 0		$ 73,000,000
LIBOR | Minimum | Term Loans | $150 Million Term Loan
Debt Instrument [Line Items]
Basis spread on variable rate		0.90%	1.40%
LIBOR | Maximum | Term Loans | $150 Million Term Loan
Debt Instrument [Line Items]
Basis spread on variable rate		1.75%	2.35%

Bonds Payable (Details)

Bonds Payable (Details) - USD ($)	Aug. 12, 2016	Mar. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Debt Instrument [Line Items]
Proceeds from issuance of bonds payable			$ 0	$ 348,691,000
Initial issuance discount of bonds payable			1,529,000		$ 1,664,000
Bonds payable, net			693,562,000		692,972,000
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%
Proceeds from issuance of bonds payable	$ 346,400,000
Initial issuance discount of bonds payable	1,300,000
Bonds Payable | 2018 Bonds Payable
Debt Instrument [Line Items]
Face amount of issued debt instrument	$ 250,000,000
Maturity of debt instrument	7 years
Interest rate for debt instrument (percent)	5.875%
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%
Proceeds from issuance of bonds payable		$ 347,200,000
Initial issuance discount of bonds payable		$ 500,000
Bonds Payable | 2026 and 2025 Bonds Payable
Debt Instrument [Line Items]
Interest payments			20,100,000
Bonds Payable | 2026 and 2025 Bonds Payable | Level 2
Debt Instrument [Line Items]
Estimated fair value of debt instrument			702,900,000		703,100,000
Bonds payable, net			$ 698,500,000		$ 698,300,000
Bonds Payable | 2025 and 2018 Bonds Payable
Debt Instrument [Line Items]
Interest payments				$ 20,800,000

Commitments and Contingencies (

Commitments and Contingencies (Details)	Sep. 30, 2017USD ($)Tenant	Dec. 31, 2016USD ($)	Oct. 31, 2015USD ($)
Loss Contingencies [Line Items]
Number of tenants that have exercised the option to expand property | Tenant	0
Blackstone Property Partners | Corporate Joint Venture
Loss Contingencies [Line Items]
Guaranty liability | $	$ 11,200,000	$ 16,100,000	$ 25,000,000

Stockholders' Equity (Narrative

Stockholders' Equity (Narrative) (Details) - USD ($)	Jan. 20, 2017	Sep. 30, 2017	Sep. 30, 2017	Dec. 31, 2016	Sep. 04, 2017	Sep. 04, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, par value (dollars per share)		$ 0.01	$ 0.01	$ 0.01
Granted (shares)			664,000
Unrecognized compensation costs related to unvested awards		$ 9,900,000	$ 9,900,000	$ 3,200,000
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	4,800,000
Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)	193,535
Shares withheld to settle tax liability	17,938
Long Term Incentive Plan | Grant Date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights (percent)	25.00%
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 | 2013 Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)			139,825
Vesting period			4 years
Common Stock | 2015 and 2017 Stock Repurchase Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares repurchased (in shares)		1,400,000
Shares repurchased, average cost per share (dollars per share)		$ 21.02
Value of stock repurchased		$ 30,100,000
Common Stock | 2015 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)					5,600,000
Shares repurchased, average cost per share (dollars per share)					$ 21.85
Value of stock repurchased					$ 121,400,000
Common Stock | 2017 Stock Repurchase Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount					$ 200,000,000
Common stock, par value (dollars per share)					$ 0.01
Stock repurchase program, amount available for repurchase		$ 194,800,000	$ 194,800,000
Performance Shares | 2013 Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)			330,880
Performance period			3 years	1 year
Performance Shares | 2013 Long Term Incentive Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shareholder return as a percent			0.00%
Performance Shares | 2013 Long Term Incentive Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shareholder return as a percent			150.00%
Performance Shares | 2013 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%
Performance Shares | 2013 Long Term Incentive Plan | One Year Post Performance Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights (percent)			25.00%
Performance Shares | 2013 Long Term Incentive Plan | End of Performance Period, One Year Transitional Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period			1 year
Performance Shares | 2013 Long Term Incentive Plan | End of Performance Period, Two Year Transitional Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period			2 years

Stockholders' Equity (Unvested

Stockholders' Equity (Unvested Activity Rollforward) (Details)	9 Months Ended
	Sep. 30, 2017$ / sharesshares
Shares Rollforward
Unvested shares - beginning of period (shares)	256,000
Granted (shares)	664,000
Vested (shares)	(161,000)
Forfeited (shares)	(9,000)
Unvested shares - end of period (shares)	750,000
Weighted-Average, Grant-Date Fair Value Rollforward
Unvested shares - beginning of period (dollars per share) | $ / shares	$ 22.62
Granted (dollars per share) | $ / shares	20.20
Vested (dollars per share) | $ / shares	22.67
Forfeited (dollars per share) | $ / shares	21.12
Unvested shares - end of period (dollars per share) | $ / shares	$ 20.48
Shares expected to ultimately vest	694,928
Expected forfeiture rate	4.70%

Stockholders' Equity (Summary o

Stockholders' Equity (Summary of Shares Granted to Independent Directors) (Details) - $ / shares	May 02, 2017	Jan. 03, 2017	Jul. 01, 2016	Apr. 01, 2016	Jan. 04, 2016	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares						664,000
Grant-Date Fair Value (dollars per share)						$ 20.20
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
Director | May 2, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares	33,581
Grant-Date Fair Value (dollars per share)	$ 22.57
Director | January 4, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares					7,439
Grant-Date Fair Value (dollars per share)					$ 23
Director | April 1, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares				8,120
Grant-Date Fair Value (dollars per share)				$ 21.89
Director | July 1, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares			8,158
Grant-Date Fair Value (dollars per share)			$ 21.52

Stockholders' Equity (Stock-bas

Stockholders' Equity (Stock-based Compensation Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 1,556	$ 917	$ 5,509	$ 3,512
Future employee awards	639	91	1,851	797
Employees
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	917	650	2,721	2,190
Director
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 0	$ 176	$ 937	$ 525

Supplemental Disclosures of N55

Supplemental Disclosures of Noncash Investing and Financing Activities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Supplemental Cash Flow Elements [Abstract]
Investments in real estate funded with other assets	$ 311	$ 1,442
Real estate assets transferred to unconsolidated joint ventures	558,122	0
Other assets transferred to unconsolidated joint ventures	43,670	0
Other liabilities transferred to unconsolidated joint ventures	21,347	0
Discount on issuance of bonds payable	0	1,309
Deposits applied to sales of real estate	10,000	0
Amortization of net discounts on debt	135	222
Market value adjustments to interest rate swaps that qualify for hedge accounting treatment	146	(5,629)
Accrued capital expenditures and deferred lease costs	25,866	16,074
Accrued deferred financing costs	0	12
Common stock issued to employees and directors, and amortized (net of income tax withholdings)	$ 4,061	$ 2,339

Earnings Per Share (Basic and D

Earnings Per Share (Basic and Diluted EPS Computations) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 101,534	$ 36,898	$ 177,389	$ 56,881
Distributions paid on unvested shares	(84)	(77)	(253)	(237)
Net income used to calculate basic and diluted earnings per share	$ 101,450	$ 36,821	$ 177,136	$ 56,644
Weighted-average common shares – basic	120,293	123,215	121,270	123,271
Weighted-average common shares – diluted	120,529	123,350	121,458	123,348
Previously granted LTIP 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	116	82	89	46
Future LTIP 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	120	53	99	31

Segment Information (Operating

Segment Information (Operating Revenues by Geographic Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jul. 06, 2017	Jul. 05, 2017
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	$ 81,627	$ 117,747	$ 248,154	$ 382,046
Operating revenues	60,362	113,266	217,375	367,775
Asset and property management fee income	1,154	511	2,126	1,655
Operating Segments
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	81,125	111,356	246,682	363,911
Operating Segments | New York
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	30,488	23,996	83,598	89,683
Operating Segments | San Francisco
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	25,337	26,407	80,112	82,310
Operating Segments | Atlanta
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	9,401	9,192	28,239	27,625
Operating Segments | Washington, D.C.
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	8,494	7,689	23,622	25,602
Operating Segments | Boston
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	2,734	2,879	8,358	8,782
Operating Segments | Los Angeles
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	1,899	1,635	5,534	5,526
Operating Segments | All other office markets
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	2,772	39,558	17,219	124,383
Hotel
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	(24)	6,343	1,199	17,705
Asset and property management fee income	1,154	511	2,126	1,655
Corporate
Segment Reporting Information [Line Items]
Operating revenues including unconsolidated joint venture	526	48	273	430
Eliminations
Segment Reporting Information [Line Items]
Operating revenues	22,419	4,992	32,905	15,926
Asset and property management fee income	$ (1,154)	(511)	$ (2,126)	(1,655)
114 Fifth Avenue Joint Venture | Corporate Joint Venture
Segment Reporting Information [Line Items]
Ownership percentage	49.50%		49.50%
333 Market Street and University Circle | Corporate Joint Venture
Segment Reporting Information [Line Items]
Ownership percentage	77.50%		77.50%			100.00%
University Circle Joint Venture | Corporate Joint Venture
Segment Reporting Information [Line Items]
Ownership percentage	77.50%		77.50%		77.50%
Asset and property management fee income	$ 480	0	$ 480	0
Market Square Joint Venture | Corporate Joint Venture
Segment Reporting Information [Line Items]
Ownership percentage	51.00%		51.00%
Asset and property management fee income	$ 496	$ 511	$ 1,468	$ 1,655

Segment Information (Net Operat

Segment Information (Net Operating Income By Geographic Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jul. 05, 2017
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	$ 53,445	$ 70,640	$ 165,705	$ 237,713
Operating Segments
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	53,833	69,398	167,108	234,679
Operating Segments | New York
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	16,536	11,380	50,411	52,515
Operating Segments | San Francisco
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	18,166	20,095	57,733	60,547
Operating Segments | Atlanta
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	8,500	8,249	25,078	24,756
Operating Segments | Washington, D.C.
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	4,209	3,632	11,052	13,303
Operating Segments | Boston
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	1,196	1,425	3,797	4,111
Operating Segments | Los Angeles
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	1,155	894	3,439	3,336
Operating Segments | All other office markets
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	4,071	23,723	15,598	76,111
Hotel
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	(24)	1,301	(914)	3,171
Corporate
Segment Reporting Information [Line Items]
Net operating income (loss) including unconsolidated joint venture	$ (364)	$ (59)	$ (489)	$ (137)
114 Fifth Avenue Joint Venture | Corporate Joint Venture
Segment Reporting Information [Line Items]
Ownership percentage	49.50%		49.50%
333 Market Street and University Circle | Corporate Joint Venture
Segment Reporting Information [Line Items]
Ownership percentage	77.50%		77.50%		100.00%
Market Square Joint Venture | Corporate Joint Venture
Segment Reporting Information [Line Items]
Ownership percentage	51.00%		51.00%

Segment Information (Reconcilia

Segment Information (Reconciliation of GAAP Net Income to NOI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Net income	$ 101,534	$ 36,898	$ 177,389	$ 56,881
Depreciation	18,501	26,778	60,529	84,517
Amortization	6,870	11,895	24,518	42,902
General and administrative - corporate	7,034	7,467	25,003	25,718
General and administrative - unconsolidated joint ventures	713	0	713	0
Income tax expense (benefit)	3	65	(378)	387
Asset and property management fee income	(1,154)	(511)	(2,126)	(1,655)
Gain on sales of real estate assets	(102,365)	(50,412)	(175,518)	(50,083)
NOI	53,445	70,640	165,705	237,713
Segment Reconciling Items
Segment Reporting Information [Line Items]
Depreciation	18,501	26,778	60,529	84,517
Amortization	6,870	11,895	24,518	42,902
General and administrative - corporate	7,034	7,467	25,003	25,718
General and administrative - unconsolidated joint ventures	713	0	713	0
Net interest expense	13,690	17,116	42,040	52,380
Interest income from development authority bonds	(1,800)	(1,800)	(5,400)	(5,400)
Loss on early extinguishment of debt	280	18,905	325	18,997
Income tax expense (benefit)	3	65	(378)	387
Asset and property management fee income	(1,154)	(511)	(2,126)	(1,655)
Adjustments included in income (loss) from unconsolidated joint ventures	10,139	4,239	18,610	13,069
Gain on sales of real estate assets	$ (102,365)	$ (50,412)	$ (175,518)	$ (50,083)

Financial Information for Par60

Financial Information for Parent Guarantor, Issuer Subsidiary, and Non-Guarantor Subsidiaries (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
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	$ 47,115	$ 149,704
Increase (decrease) in investing cash flows	490,434	415,578
Increase (decrease) in financing cash flows	(370,904)	(407,071)
Reportable Legal Entities | Parent
Condensed Financial Statements, Captions [Line Items]
Increase in operating cash flows	168,209	33,797
Increase (decrease) in investing cash flows	185,835	309,308
Increase (decrease) in financing cash flows	(168,651)	(174,660)
Reportable Legal Entities | Issuer
Condensed Financial Statements, Captions [Line Items]
Increase in operating cash flows	151,932	63,440
Increase (decrease) in investing cash flows	258,102	450,268
Increase (decrease) in financing cash flows	(409,743)	(519,334)
Reportable Legal Entities | Non- Guarantors
Condensed Financial Statements, Captions [Line Items]
Increase in operating cash flows	80,195	188,021
Increase (decrease) in investing cash flows	615,271	429,481
Increase (decrease) in financing cash flows	$ (714,505)	(622,110)
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		33,200
Increase (decrease) in investing cash flows		(172,800)
Increase (decrease) in financing cash flows		139,600
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		102,400
Increase (decrease) in investing cash flows		464,200
Increase (decrease) in financing cash flows		(566,600)
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		482,100
Increase (decrease) in financing cash flows		$ (482,100)

Financial Information for Par61

Financial Information for Parent Guarantor, Issuer Subsidiary, and Non-Guarantor Subsidiaries (Condensed Consolidating Balance Sheets) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Assets:
Land	$ 609,110	$ 751,351
Buildings and improvements, net	1,704,630	2,121,150
Intangible lease assets, net	164,699	193,311
Construction in progress	49,255	36,188
Real estate assets held for sale, net	0	412,506
Total real estate assets	2,527,694	3,514,506
Investment in unconsolidated joint ventures	698,105	127,346
Cash and cash equivalents	382,730	216,085	$ 190,856	$ 32,645
Investment in subsidiaries	0	0
Tenant receivables, net of allowance	2,814	7,163
Straight-line rent receivable	80,128	64,811
Prepaid expenses and other assets	75,802	24,275
Intangible lease origination costs, net	28,067	54,279
Deferred lease costs, net	127,940	125,799
Investment in development authority bonds	120,000	120,000
Other assets held for sale	0	45,529
Total assets	4,043,280	4,299,793
Liabilities:
Lines of credit and notes payable, net	520,367	721,466
Bonds payable, net	693,562	692,972
Accounts payable, accrued expenses, and accrued capital expenditures	129,802	131,028
Dividends payable	0	36,727
Due to affiliates	0	0
Deferred income	15,756	19,694
Intangible lease liabilities, net	9,891	33,375
Obligations under capital lease	120,000	120,000
Liabilities held for sale	0	41,763
Total liabilities	1,489,378	1,797,025
Equity:
Total equity	2,553,902	2,502,768	2,531,665	2,614,194
Total liabilities and equity	4,043,280	4,299,793
Reportable Legal Entities | Columbia Property Trust (Parent) (Guarantor)
Assets:
Land	0	0
Buildings and improvements, net	0	0
Intangible lease assets, net	0	0
Construction in progress	0	0
Real estate assets held for sale, net		0
Total real estate assets	0	0
Investment in unconsolidated joint ventures	0	0
Cash and cash equivalents	359,813	174,420	169,434	989
Investment in subsidiaries	1,824,737	2,047,922
Tenant receivables, net of allowance	0	0
Straight-line rent receivable	0	0
Prepaid expenses and other assets	369,358	317,153
Intangible lease origination costs, net	0	0
Deferred lease costs, net	0	0
Investment in development authority bonds	0	0
Other assets held for sale		0
Total assets	2,553,908	2,539,495
Liabilities:
Lines of credit and notes payable, net	0	0
Bonds payable, net	0	0
Accounts payable, accrued expenses, and accrued capital expenditures	2	0
Dividends payable		36,727
Due to affiliates	0	0
Deferred income	4	0
Intangible lease liabilities, net	0	0
Obligations under capital lease	0	0
Liabilities held for sale		0
Total liabilities	6	36,727
Equity:
Total equity	2,553,902	2,502,768
Total liabilities and equity	2,553,908	2,539,495
Reportable Legal Entities | Columbia Property Trust OP (the Issuer)
Assets:
Land	0	0
Buildings and improvements, net	58	219
Intangible lease assets, net	0	0
Construction in progress	0	0
Real estate assets held for sale, net		34,956
Total real estate assets	58	35,175
Investment in unconsolidated joint ventures	698,105	127,346
Cash and cash equivalents	16,800	16,509	9,343	14,969
Investment in subsidiaries	1,007,852	1,782,752
Tenant receivables, net of allowance	31	0
Straight-line rent receivable	0	0
Prepaid expenses and other assets	123,064	262,216
Intangible lease origination costs, net	0	0
Deferred lease costs, net	0	0
Investment in development authority bonds	0	0
Other assets held for sale		3,767
Total assets	1,845,910	2,227,765
Liabilities:
Lines of credit and notes payable, net	447,588	447,643
Bonds payable, net	693,562	692,972
Accounts payable, accrued expenses, and accrued capital expenditures	11,049	10,395
Dividends payable		0
Due to affiliates	0	58
Deferred income	81	0
Intangible lease liabilities, net	0	0
Obligations under capital lease	0	0
Liabilities held for sale		2,651
Total liabilities	1,152,280	1,153,719
Equity:
Total equity	693,630	1,074,046
Total liabilities and equity	1,845,910	2,227,765
Reportable Legal Entities | Non- Guarantors
Assets:
Land	609,110	751,351
Buildings and improvements, net	1,704,572	2,120,931
Intangible lease assets, net	164,699	193,311
Construction in progress	49,255	36,188
Real estate assets held for sale, net		377,550
Total real estate assets	2,527,636	3,479,331
Investment in unconsolidated joint ventures	0	0
Cash and cash equivalents	6,117	25,156	12,079	16,687
Investment in subsidiaries	0	0
Tenant receivables, net of allowance	2,783	7,163
Straight-line rent receivable	80,128	64,811
Prepaid expenses and other assets	15,735	15,593
Intangible lease origination costs, net	28,067	54,279
Deferred lease costs, net	127,940	125,799
Investment in development authority bonds	120,000	120,000
Other assets held for sale		41,814
Total assets	2,908,406	3,933,946
Liabilities:
Lines of credit and notes payable, net	503,542	704,585
Bonds payable, net	0	0
Accounts payable, accrued expenses, and accrued capital expenditures	118,751	120,633
Dividends payable		0
Due to affiliates	1,592	1,534
Deferred income	15,671	19,694
Intangible lease liabilities, net	9,891	33,375
Obligations under capital lease	120,000	120,000
Liabilities held for sale		177,497
Total liabilities	769,447	1,177,318
Equity:
Total equity	2,138,959	2,756,628
Total liabilities and equity	2,908,406	3,933,946
Consolidating Adjustments
Assets:
Land	0	0
Buildings and improvements, net	0	0
Intangible lease assets, net	0	0
Construction in progress	0	0
Real estate assets held for sale, net		0
Total real estate assets	0	0
Investment in unconsolidated joint ventures	0	0
Cash and cash equivalents	0	0	$ 0	$ 0
Investment in subsidiaries	(2,832,589)	(3,830,674)
Tenant receivables, net of allowance	0	0
Straight-line rent receivable	0	0
Prepaid expenses and other assets	(432,355)	(570,687)
Intangible lease origination costs, net	0	0
Deferred lease costs, net	0	0
Investment in development authority bonds	0	0
Other assets held for sale		(52)
Total assets	(3,264,944)	(4,401,413)
Liabilities:
Lines of credit and notes payable, net	(430,763)	(430,762)
Bonds payable, net	0	0
Accounts payable, accrued expenses, and accrued capital expenditures	0	0
Dividends payable		0
Due to affiliates	(1,592)	(1,592)
Deferred income	0	0
Intangible lease liabilities, net	0	0
Obligations under capital lease	0	0
Liabilities held for sale		(138,385)
Total liabilities	(432,355)	(570,739)
Equity:
Total equity	(2,832,589)	(3,830,674)
Total liabilities and equity	$ (3,264,944)	$ (4,401,413)

Financial Information for Par62

Financial Information for Parent Guarantor, Issuer Subsidiary, and Non-Guarantor Subsidiaries (Consolidating Statements of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues:
Rental income	$ 55,015	$ 87,561	$ 193,309	$ 280,714
Tenant reimbursements	3,053	17,090	18,609	55,551
Hotel income	0	6,270	1,339	17,484
Asset and property management fee income	1,154	511	2,126	1,655
Other property income	1,140	1,834	1,992	12,371
Revenues	60,362	113,266	217,375	367,775
Expenses:
Property operating costs	18,567	39,101	64,503	120,679
Hotel operating costs	0	4,946	2,085	14,315
Asset and property management fees:
Related-party		0	0	0
Other	188	387	717	1,058
Depreciation	18,501	26,778	60,529	84,517
Amortization	6,870	11,895	24,518	42,902
General and administrative - corporate	7,034	7,467	25,003	25,718
General and administrative - unconsolidated joint ventures	713	0	713	0
Costs and expenses	51,873	90,574	178,068	289,189
Real estate operating income	8,489	22,692	39,307	78,586
Other income (expense):
Interest expense	(14,731)	(17,138)	(44,308)	(52,415)
Interest and other income	2,841	1,839	7,668	5,452
Loss on early extinguishment of debt	(280)	(18,905)	(325)	(18,997)
Nonoperating income (expense)	(12,170)	(34,204)	(36,965)	(65,960)
Income (loss) before income taxes, unconsolidated joint ventures, and sales of real estate:	(3,681)	(11,512)	2,342	12,626
Income tax benefit (expense)	(3)	(65)	378	(387)
Income (loss) from unconsolidated entities	2,853		(849)	0
Income (loss) from unconsolidated joint ventures	2,853	(1,937)	(849)	(5,441)
Income from subsidiaries		0
Income (loss) before sales of real estate:	(831)	(13,514)	1,871	6,798
Gain on sales of real estate assets	102,365	50,412	175,518	50,083
Net income	101,534	36,898	177,389	56,881
Reportable Legal Entities | Columbia Property Trust (Parent) (Guarantor)
Revenues:
Rental income	0	0	0	0
Tenant reimbursements	0	0	0	0
Hotel income		0	0	0
Asset and property management fee income	569	245	1,059	735
Other property income	0	0	0	0
Revenues	569	245	1,059	735
Expenses:
Property operating costs	0	0	0	0
Hotel operating costs		0	0	0
Asset and property management fees:
Related-party		0	0	0
Other	0	0	0	0
Depreciation	0	0	0	0
Amortization	0	0	0	0
General and administrative - corporate	39	38	135	116
General and administrative - unconsolidated joint ventures	0		0
Costs and expenses	39	38	135	116
Real estate operating income	530	207	924	619
Other income (expense):
Interest expense	0	0	0	0
Interest and other income	4,593	3,571	12,923	10,680
Loss on early extinguishment of debt	0	0	0	0
Nonoperating income (expense)	4,593	3,571	12,923	10,680
Income (loss) before income taxes, unconsolidated joint ventures, and sales of real estate:	5,123	3,778	13,847	11,299
Income tax benefit (expense)	0	0	0	0
Income (loss) from unconsolidated entities	96,411		163,542	45,582
Income (loss) from unconsolidated joint ventures		0		0
Income from subsidiaries		33,120
Income (loss) before sales of real estate:	101,534	36,898	177,389	56,881
Gain on sales of real estate assets	0	0	0	0
Net income	101,534	36,898	177,389	56,881
Reportable Legal Entities | Columbia Property Trust OP (the Issuer)
Revenues:
Rental income	0	956	51	2,669
Tenant reimbursements	7	564	(59)	1,421
Hotel income		0	0	0
Asset and property management fee income	0	0	0	0
Other property income	0	0	0	0
Revenues	7	1,520	(8)	4,090
Expenses:
Property operating costs	113	860	241	2,360
Hotel operating costs		0	0	0
Asset and property management fees:
Related-party		40	3	112
Other	0	0	0	0
Depreciation	310	745	544	2,166
Amortization	0	86	5	239
General and administrative - corporate	1,758	2,297	7,013	6,575
General and administrative - unconsolidated joint ventures	0		0
Costs and expenses	2,181	4,028	7,806	11,452
Real estate operating income	(2,174)	(2,508)	(7,814)	(7,362)
Other income (expense):
Interest expense	(10,702)	(12,249)	(31,554)	(36,479)
Interest and other income	1,220	3,813	4,517	11,471
Loss on early extinguishment of debt	0	(18,905)	0	(18,987)
Nonoperating income (expense)	(9,482)	(27,341)	(27,037)	(43,995)
Income (loss) before income taxes, unconsolidated joint ventures, and sales of real estate:	(11,656)	(29,849)	(34,851)	(51,357)
Income tax benefit (expense)	(1)	0	(1)	(12)
Income (loss) from unconsolidated entities	109,630		188,832	89,972
Income (loss) from unconsolidated joint ventures		(1,937)		(5,441)
Income from subsidiaries		61,442
Income (loss) before sales of real estate:	97,973	29,656	153,980	33,162
Gain on sales of real estate assets	0	0	11,050	0
Net income	97,973	29,656	165,030	33,162
Reportable Legal Entities | Non- Guarantors
Revenues:
Rental income	55,113	86,702	193,551	278,330
Tenant reimbursements	3,046	16,526	18,668	54,130
Hotel income		6,270	1,339	17,484
Asset and property management fee income	585	266	1,067	920
Other property income	1,140	1,930	2,010	12,651
Revenues	59,884	111,694	216,635	363,515
Expenses:
Property operating costs	18,552	38,338	64,555	118,604
Hotel operating costs		4,946	2,085	14,315
Asset and property management fees:
Related-party		0	0	0
Other	188	387	717	1,058
Depreciation	18,191	26,033	59,985	82,351
Amortization	6,870	11,809	24,513	42,663
General and administrative - corporate	5,237	5,188	17,870	19,195
General and administrative - unconsolidated joint ventures	713		713
Costs and expenses	49,751	86,701	170,438	278,186
Real estate operating income	10,133	24,993	46,197	85,329
Other income (expense):
Interest expense	(8,803)	(12,256)	(27,935)	(38,071)
Interest and other income	1,802	1,822	5,409	5,436
Loss on early extinguishment of debt	(280)	0	(325)	(10)
Nonoperating income (expense)	(7,281)	(10,434)	(22,851)	(32,645)
Income (loss) before income taxes, unconsolidated joint ventures, and sales of real estate:	2,852	14,559	23,346	52,684
Income tax benefit (expense)	(2)	(65)	379	(375)
Income (loss) from unconsolidated entities	(1)		0	0
Income (loss) from unconsolidated joint ventures		0		0
Income from subsidiaries		0
Income (loss) before sales of real estate:	2,849	14,494	23,725	52,309
Gain on sales of real estate assets	102,365	50,412	164,468	50,083
Net income	105,214	64,906	188,193	102,392
Consolidating Adjustments
Revenues:
Rental income	(98)	(97)	(293)	(285)
Tenant reimbursements	0	0	0	0
Hotel income		0	0	0
Asset and property management fee income	0	0	0	0
Other property income	0	(96)	(18)	(280)
Revenues	(98)	(193)	(311)	(565)
Expenses:
Property operating costs	(98)	(97)	(293)	(285)
Hotel operating costs		0	0	0
Asset and property management fees:
Related-party		(40)	(3)	(112)
Other	0	0	0	0
Depreciation	0	0	0	0
Amortization	0	0	0	0
General and administrative - corporate	0	(56)	(15)	(168)
General and administrative - unconsolidated joint ventures	0		0
Costs and expenses	(98)	(193)	(311)	(565)
Real estate operating income	0	0	0	0
Other income (expense):
Interest expense	4,774	7,367	15,181	22,135
Interest and other income	(4,774)	(7,367)	(15,181)	(22,135)
Loss on early extinguishment of debt	0	0	0	0
Nonoperating income (expense)	0	0	0	0
Income (loss) before income taxes, unconsolidated joint ventures, and sales of real estate:	0	0	0	0
Income tax benefit (expense)	0	0	0	0
Income (loss) from unconsolidated entities	(203,187)		(353,223)	(135,554)
Income (loss) from unconsolidated joint ventures		0		0
Income from subsidiaries		(94,562)
Income (loss) before sales of real estate:	(203,187)	(94,562)	(353,223)	(135,554)
Gain on sales of real estate assets	0	0	0	0
Net income	$ (203,187)	$ (94,562)	$ (353,223)	$ (135,554)

Financial Information for Par63

Financial Information for Parent Guarantor, Issuer Subsidiary, and Non-Guarantor Subsidiaries (Consolidating Statements of Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Condensed Financial Statements, Captions [Line Items]
Net income	$ 101,534	$ 36,898	$ 177,389	$ 56,881
Market value adjustment to interest rate swap	148	1,250	146	(5,629)
Comprehensive income	101,682	38,148	177,535	51,252
Reportable Legal Entities | Columbia Property Trust (Parent) (Guarantor)
Condensed Financial Statements, Captions [Line Items]
Net income	101,534	36,898	177,389	56,881
Market value adjustment to interest rate swap	148	1,250	146	(5,629)
Comprehensive income	101,682	38,148	177,535	51,252
Reportable Legal Entities | Columbia Property Trust OP (the Issuer)
Condensed Financial Statements, Captions [Line Items]
Net income	97,973	29,656	165,030	33,162
Market value adjustment to interest rate swap	148	1,250	146	(5,629)
Comprehensive income	98,121	30,906	165,176	27,533
Reportable Legal Entities | Non- Guarantors
Condensed Financial Statements, Captions [Line Items]
Net income	105,214	64,906	188,193	102,392
Market value adjustment to interest rate swap	0	0	0	0
Comprehensive income	105,214	64,906	188,193	102,392
Consolidating Adjustments
Condensed Financial Statements, Captions [Line Items]
Net income	(203,187)	(94,562)	(353,223)	(135,554)
Market value adjustment to interest rate swap	(148)	(1,250)	(146)	5,629
Comprehensive income	$ (203,335)	$ (95,812)	$ (353,369)	$ (129,925)

Financial Information for Par64

Financial Information for Parent Guarantor, Issuer Subsidiary, and Non-Guarantor Subsidiaries (Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	$ 47,115	$ 149,704
Cash flows from investing activities:
Net proceeds from the sales of real estate	737,631	482,089
Investment in real estate and related assets	(125,459)	(54,160)
Investments in unconsolidated joint ventures	(123,149)	(12,351)
Distributions from unconsolidated joint ventures	1,411	0
Distributions from subsidiaries	0	0
Net cash provided by investing activities	490,434	415,578
Cash flows from financing activities:
Debt prepayment and interest rate swap settlement costs paid	0	(17,921)
Borrowings, net of fees	(628)	780,580
Repayments	(201,625)	(995,070)
Distributions	(109,561)	(148,474)
Repurchases of common stock	(59,090)	(26,186)
Net cash used in financing activities	(370,904)	(407,071)
Net increase (decrease) in cash and cash equivalents	166,645	158,211
Cash and cash equivalents, beginning of period	216,085	32,645
Cash and cash equivalents, end of period	382,730	190,856
Reportable Legal Entities | Columbia Property Trust (Parent) (Guarantor)
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	168,209	33,797
Cash flows from investing activities:
Net proceeds from the sales of real estate	0	0
Investment in real estate and related assets	(52,000)	0
Investments in unconsolidated joint ventures	0	0
Distributions from unconsolidated joint ventures	0
Distributions from subsidiaries	237,835	309,308
Net cash provided by investing activities	185,835	309,308
Cash flows from financing activities:
Debt prepayment and interest rate swap settlement costs paid		0
Borrowings, net of fees	0	0
Repayments	0	0
Distributions	(109,561)	(148,474)
Repurchases of common stock	(59,090)	(26,186)
Net cash used in financing activities	(168,651)	(174,660)
Net increase (decrease) in cash and cash equivalents	185,393	168,445
Cash and cash equivalents, beginning of period	174,420	989
Cash and cash equivalents, end of period	359,813	169,434
Increase (decrease) in net proceeds from sales of real estate		(482,100)
Increase (decrease) in distributions from subsidiaries		309,300
Increase (decrease) in debt prepayments and interest rate swap settlement costs paid		17,900
Increase (decrease) in borrowings, net of fees		(348,700)
Increase (decrease) in repayments		250,000
Reportable Legal Entities | Columbia Property Trust OP (the Issuer)
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	151,932	63,440
Cash flows from investing activities:
Net proceeds from the sales of real estate	49,531	0
Investment in real estate and related assets	(630)	(1,552)
Investments in unconsolidated joint ventures	(123,149)	(12,351)
Distributions from unconsolidated joint ventures	1,411
Distributions from subsidiaries	330,939	464,171
Net cash provided by investing activities	258,102	450,268
Cash flows from financing activities:
Debt prepayment and interest rate swap settlement costs paid		(17,921)
Borrowings, net of fees	(628)	780,580
Repayments	0	(952,000)
Distributions	(409,115)	(329,993)
Repurchases of common stock	0	0
Net cash used in financing activities	(409,743)	(519,334)
Net increase (decrease) in cash and cash equivalents	291	(5,626)
Cash and cash equivalents, beginning of period	16,509	14,969
Cash and cash equivalents, end of period	16,800	9,343
Increase (decrease) in distributions from subsidiaries		464,200
Increase (decrease) in debt prepayments and interest rate swap settlement costs paid		(17,900)
Increase (decrease) in borrowings, net of fees		348,700
Increase (decrease) in repayments		(250,000)
Increase (decrease) in distributions		(330,000)
Reportable Legal Entities | Non- Guarantors
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	80,195	188,021
Cash flows from investing activities:
Net proceeds from the sales of real estate	688,100	482,089
Investment in real estate and related assets	(72,829)	(52,608)
Investments in unconsolidated joint ventures	0	0
Distributions from unconsolidated joint ventures	0
Distributions from subsidiaries	0	0
Net cash provided by investing activities	615,271	429,481
Cash flows from financing activities:
Debt prepayment and interest rate swap settlement costs paid		0
Borrowings, net of fees	0	0
Repayments	(201,625)	(43,070)
Distributions	(512,880)	(579,040)
Repurchases of common stock	0	0
Net cash used in financing activities	(714,505)	(622,110)
Net increase (decrease) in cash and cash equivalents	(19,039)	(4,608)
Cash and cash equivalents, beginning of period	25,156	16,687
Cash and cash equivalents, end of period	6,117	12,079
Increase (decrease) in net proceeds from sales of real estate		482,100
Increase (decrease) in distributions		(579,000)
Eliminations
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	(353,221)	(135,554)
Cash flows from investing activities:
Net proceeds from the sales of real estate	0	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	(568,774)	(773,479)
Net cash provided by investing activities	(568,774)	(773,479)
Cash flows from financing activities:
Debt prepayment and interest rate swap settlement costs paid		0
Borrowings, net of fees	0	0
Repayments	0	0
Distributions	921,995	909,033
Repurchases of common stock	0	0
Net cash used in financing activities	921,995	909,033
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		(773,500)
Increase (decrease) in distributions		$ 909,000