Columbia Property Trust (CXP) 10-Q 30 Jul 15 2015 Q2 Quarterly report Financial data

Document Entity Information

Document Entity Information - shares	6 Months Ended
	Jun. 30, 2015	Jul. 30, 2015
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	Jun. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		125,079,946

Consolidated Balance Sheets (un

Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Assets:
Land	$ 849,042	$ 785,101
Buildings and improvements, less accumulated depreciation of $616,274 and $660,098, as of June 30, 2015 and December 31, 2014, respectively	3,071,335	3,026,431
Intangible lease assets, less accumulated amortization of $264,564 and $313,822, as of June 30, 2015 and December 31, 2014, respectively	265,735	247,068
Construction in progress	39,777	17,962
Real estate assets held for sale, less accumulated depreciation and amortization of $139,820, as of June 30, 2015	372,484	0
Total real estate assets	4,598,373	4,076,562
Cash and cash equivalents	33,742	149,790
Tenant receivables, net of allowance for doubtful accounts of $0 and $3 as of June 30, 2015 and December 31, 2014	8,551	6,945
Straight-line rent receivable	107,727	116,489
Prepaid expenses and other assets	28,910	52,143
Deferred financing costs, less accumulated amortization of $16,695 and $15,205, as of June 30, 2015 and December 31, 2014, respectively	9,811	8,426
Intangible lease origination costs, less accumulated amortization of $179,438 and $219,626, as of June 30, 2015 and December 31, 2014, respectively	84,407	105,528
Deferred lease costs, less accumulated amortization of $37,166 and $36,589, as of June 30, 2015 and December 31, 2014, respectively	97,834	102,995
Investment in development authority bonds	120,000	120,000
Other assets held for sale, less accumulated amortization of $42,181, as of June 30, 2015	36,878	0
Total assets	5,126,233	4,738,878
Liabilities:
Line of credit and notes payable	1,517,696	1,430,884
Bonds payable, net of discounts of $1,171 and $818, as of June 30, 2015 and December 31, 2014, respectively	598,829	249,182
Accounts payable, accrued expenses, and accrued capital expenditures	93,144	106,276
Deferred income	22,304	24,753
Intangible lease liabilities, less accumulated amortization of $79,607 and $84,935, as of June 30, 2015 and December 31, 2014, respectively	71,387	74,305
Obligations under capital leases	120,000	120,000
Liabilities held for sale, less accumulated amortization of $3,662, as of June 30, 2015	28,239	0
Total liabilities	2,451,599	2,005,400
Commitments and Contingencies (Note 6)	0	0
Equity:
Common stock, $0.01 par value, 225,000,000 shares authorized, 125,075,802 and 124,973,304 shares issued and outstanding as of June 30, 2015 and December 31, 2014, respectively	1,250	1,249
Additional paid-in capital	4,603,107	4,601,808
Cumulative distributions in excess of earnings	(1,928,350)	(1,867,611)
Cumulative other comprehensive loss	(1,373)	(1,968)
Total equity	2,674,634	2,733,478
Total liabilities and equity	$ 5,126,233	$ 4,738,878

Consolidated Balance Sheets Par

Consolidated Balance Sheets Parentheticals (unaudited) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Buildings and improvements - accumulated depreciation	$ 616,274	$ 660,098
Intangible lease assets - accumulated amortization	264,564	313,822
Real estate assets held for sale, accumulated amortization	139,820	0
Allowance for doubtful accounts	0	3
Deferred financing costs, accumulated amortization	16,695	15,205
Intangible lease origination costs, accumulated amortization	179,438	219,626
Deferred lease costs, accumulated amortization	37,166	36,589
Other assets held for sale, accumulated amortization	42,181	0
Bonds payable, discount	1,171	818
Intangible lease liabilities, accumulated amortization	79,607	84,935
Liabilities held for sale, accumulated amortization	$ 3,662	$ 0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	225,000,000	225,000,000
Common stock, shares issued	125,075,082	124,973,304
Common stock, shares outstanding	125,075,082	124,973,304

Consolidated Statements of Oper

Consolidated Statements of Operations (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues:
Rental income	$ 112,916	$ 103,821	$ 225,725	$ 204,388
Tenant reimbursements	26,519	22,934	54,768	46,667
Hotel income	6,964	6,505	11,957	10,566
Other property income	1,725	3,497	3,217	4,304
Revenues	148,124	136,757	295,667	265,925
Expenses:
Property operating costs	48,083	38,832	97,837	77,812
Hotel operating costs	5,147	4,689	9,738	8,830
Asset and property management fees	503	675	900	964
Depreciation	33,813	30,169	67,820	57,473
Amortization	23,738	20,221	46,957	38,742
Impairment loss on real estate assets	0	1,432	0	14,982
General and administrative	7,080	8,412	15,124	15,358
Acquisition expenses	0	6,102	1,995	6,102
Costs and expenses	118,364	110,532	240,371	220,263
Real estate operating income	29,760	26,225	55,296	45,662
Other income (expense):
Interest expense	(22,765)	(18,860)	(44,249)	(36,770)
Interest and other income	1,807	1,802	3,640	3,612
Loss on interest rate swaps	(2)	(105)	(8)	(335)
Loss on early extinguishment of debt	0	0	(477)	0
Nonoperating income (expense)	(20,960)	(17,163)	(41,094)	(33,493)
Income before income tax benefit (expense)	8,800	9,062	14,202	12,169
Income tax benefit (expense)	(91)	(351)	105	(7)
Income from continuing operations	8,709	8,711	14,307	12,162
Discontinued operations:
Operating income (loss) from discontinued operations	0	(40)	0	237
Loss on disposition of discontinued operations	0	(650)	0	(978)
Loss from discontinued operations	0	(690)	0	(741)
Net income	$ 8,709	$ 8,021	$ 14,307	$ 11,421
Per-share information – basic:
Income from continuing operations - basic (dollars per share)	$ 0.07	$ 0.07	$ 0.11	$ 0.10
Loss from discontinued operations - basic (dollars per share)	0	(0.01)	0	(0.01)
Net income - basic (dollars per share)	$ 0.07	$ 0.06	$ 0.11	$ 0.09
Weighted-average common shares outstanding – basic	124,925	124,860	124,914	124,855
Per-share information – diluted:
Income from continuing operations - diluted (dollars per share)	$ 0.07	$ 0.07	$ 0.11	$ 0.10
Loss from discontinued operations - diluted (dollars per share)	0	(0.01)	0	(0.01)
Net income - diluted (dollars per share)	$ 0.07	$ 0.06	$ 0.11	$ 0.09
Weighted-average common shares outstanding – diluted	125,017	124,919	124,981	124,901
Dividends per share (dollars per share)	$ 0.30	$ 0.30	$ 0.60	$ 0.60

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 8,709	$ 8,021	$ 14,307	$ 11,421
Market value adjustment to interest rate swap	436	(43)	595	211
Comprehensive income	$ 9,145	$ 7,978	$ 14,902	$ 11,632

Consolidated Statements of Equi

Consolidated Statements of Equity (unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Cumulative Distributions in Excess of Earnings	Cumulative Other Comprehensive Income (Loss)
Balance, shares at beginning of period at Dec. 31, 2013		124,830,000
Balance, value at beginning of period at Dec. 31, 2013	$ 2,787,823	$ 1,248	$ 4,600,166	$ (1,810,284)	$ (3,307)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued to employees and directors, and amortized (net of amounts withheld for income taxes), shares		136,000
Common stock issued to employees and directors, and amortized (net of amounts withheld for income taxes)	709	$ 1	708
Distributions to common stockholders	(74,979)			(74,979)
Net income	11,421			11,421
Market value adjustment to interest rate swap	211				211
Balance, shares at end of period at Jun. 30, 2014		124,966,000
Balance, value at end of period at Jun. 30, 2014	$ 2,725,185	$ 1,249	4,600,874	(1,873,842)	(3,096)
Balance, shares at beginning of period at Dec. 31, 2014	124,973,304	124,973,000
Balance, value at beginning of period at Dec. 31, 2014	$ 2,733,478	$ 1,249	4,601,808	(1,867,611)	(1,968)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued to employees and directors, and amortized (net of amounts withheld for income taxes), shares		102,000
Common stock issued to employees and directors, and amortized (net of amounts withheld for income taxes)	1,300	$ 1	1,299
Distributions to common stockholders	(75,046)			(75,046)
Net income	14,307			14,307
Market value adjustment to interest rate swap	$ 595				595
Balance, shares at end of period at Jun. 30, 2015	125,075,082	125,075,000
Balance, value at end of period at Jun. 30, 2015	$ 2,674,634	$ 1,250	$ 4,603,107	$ (1,928,350)	$ (1,373)

Consolidated Statements of Equ7

Consolidated Statements of Equity Parentheticals (unaudited) - $ / shares	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Distributions to common stockholders per share (dollars per share)	$ 0.60	$ 0.60
Common Stock
Distributions to common stockholders per share (dollars per share)	$ 0.6	$ 0.6

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash Flows from Operating Activities:
Net income	$ 14,307	$ 11,421
Adjustments to reconcile net income to net cash provided by operating activities:
Straight-line rental income	(5,884)	(4,623)
Depreciation	67,820	57,473
Amortization	42,005	37,542
Impairment loss on real estate assets	0	14,982
Noncash interest expense	1,986	1,512
Loss on early extinguishment of debt	477	0
Gain on interest rate swaps	(2,633)	(2,324)
Loss on sale of real estate	0	978
Stock-based compensation expense	2,029	1,023
Changes in assets and liabilities, net of acquisitions:
Increase in tenant receivables, net	(2,526)	(455)
Decrease (increase) in prepaid expenses and other assets	(1,231)	650
Decrease in accounts payable and accrued expenses	(6,019)	(7,957)
Increase (decrease) in deferred income	(1,393)	2,761
Net cash provided by operating activities	108,938	112,983
Cash Flows from Investing Activities:
Net proceeds from the sale of real estate	0	27,131
Real estate acquisitions	(551,277)	0
Earnest money paid	0	(155,203)
Capital improvements	(41,653)	(18,868)
Deferred lease costs paid	(9,892)	(14,487)
Net cash used in investing activities	(602,822)	(161,427)
Cash Flows from Financing Activities:
Financing costs paid	(4,025)	(798)
Proceeds from lines of credit and notes payable	710,000	130,000
Repayments of lines of credit and notes payable	(601,878)	(56,300)
Proceeds from issuance of bonds payable	349,507	0
Distributions paid to stockholders	(75,046)	(74,979)
Shares redeemed to fund income tax withholdings on stock compensation	(722)	0
Net cash provided by (used in) financing activities	377,836	(2,077)
Net decrease in cash and cash equivalents	(116,048)	(50,521)
Cash and cash equivalents, beginning of period	149,790	99,855
Cash and cash equivalents, end of period	$ 33,742	$ 49,334

Organization

Organization	6 Months Ended
	Jun. 30, 2015
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 joint ventures. 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, and consolidated joint ventures. Columbia Property Trust typically invests in high-quality, income-generating office properties. As of June 30, 2015 , Columbia Property Trust owned 38 office properties and one hotel, which includes 55 operational buildings comprising approximately 16.6 million square feet of commercial space, located in 12 states and the District of Columbia. All of the office properties are wholly owned except for one property, which is owned through a consolidated subsidiary. As of June 30, 2015 , the office properties were approximately 92.1% leased. On July 1, 2015, Columbia Property Trust sold 11 of its office properties. The terms of this transaction are described in Note 3, Real Estate Transactions .

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2015
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 these 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. 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, 2014 (the " 2014 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 ("ASC") 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. 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 and 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. Columbia Property Trust considers the period of future benefit of the asset to determine the appropriate useful lives. These assessments have a direct impact on net income. The estimated useful lives of its assets by class are as follows: Buildings 40 years Building and site improvements 5-25 years Tenant improvements Shorter of economic life or lease term Intangible lease assets Lease term 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, in which Columbia Property Trust has an ownership interest, either directly or through investments in joint ventures, 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 operating 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 information, in order of preference, 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 salvage value. Certain of Columbia Property Trust's assets may be carried at more than an amount that could be realized in a current disposition transaction. Columbia Property Trust has determined that there is no additional impairment in the carrying values of our real estate assets and related intangible assets for the six months ended June 30, 2015 . 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. The subjectivity of assumptions used in the future cash flow analysis, including discount rates, could result in an incorrect assessment of the property's fair value and could result in the misstatement of the carrying value of Columbia Property Trust's real estate assets and related intangible assets and liabilities and net income. In the first quarter of 2014, Columbia Property Trust revised its investment strategy for the 160 Park Avenue Building in Florham Park, New Jersey, to sell the property to a user in the near term. As a result, management reduced its intended holding period for the building and reevaluated the property's carrying value as of March 31, 2014, pursuant to the accounting policy outlined above. Columbia Property Trust concluded that the 160 Park Avenue Building was not recoverable and reduced its carrying value to reflect its fair value, estimated based on recently quoted market prices (Level 2), by recording an impairment loss of approximately $13.6 million in the first quarter of 2014. The sale of the 160 Park Avenue Building closed on June 4, 2014, for $10.2 million , exclusive of transaction costs. In the second quarter of 2014, Columbia Property Trust decided to pursue a near-term sale of the 200 South Orange Building in Orlando, Florida, in connection with exiting this market. As a result, management reduced its intended holding period for the building and reevaluated the property's carrying value in the second quarter of 2014. In connection with negotiating the terms of the sale, Columbia Property Trust reduced the carrying value of the 200 South Orange Building to reflect fair value, estimated based on an approximate net contract price of $18.4 million (Level 1), by recording an impairment loss of $1.4 million in the second quarter of 2014. The sale of the 200 South Orange Building closed on June 30, 2014, for $18.4 million , net of transaction costs. Assets Held for Sale Columbia Property Trust classifies assets as held for sale according to ASC 360, Accounting for the Impairment or Disposal of Long-Lived Assets ("ASC 360"). According to ASC 360, assets 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 sale of the property is probable, and transfer of the property is expected to qualify for recognition as a completed sale, within one year. • 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. At such time that a property is determined to be held for sale, its carrying amount is reduced to the lower of its depreciated book value or its estimated fair value, less costs to sell, and depreciation is no longer recognized. As of June 30, 2015 , the properties included in the 11 Property Sale, as defined and described in Note 3, Real Estate Transactions , are 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 Upon the acquisition of real properties, Columbia Property Trust allocates the purchase price of 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). When calculating the intangible assets and liabilities for above-market and below-market tenant and ground leases where we are either the lessor or the lessee, the difference between the contractual rental rates and our estimate of market rental rates is measured over a period equal to the remaining non cancelable term of the leases, including significantly below market renewal options for which exercise of the renewal option appears to be reasonably assured. The remaining term of leases with renewal options at terms significantly below market reflect the assumed exercise of such below market renewal options and assume the amortization period would coincide with the extended lease term. As of June 30, 2015 and December 31, 2014 , Columbia Property Trust had the following gross intangible in-place lease assets and liabilities, including assets and liabilities 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 June 30, 2015 Gross $ 69,903 $ 367,037 $ 315,667 $ 156,131 Accumulated Amortization (53,664 ) (231,112 ) (218,160 ) (83,269 ) Net $ 16,239 $ 135,925 $ 97,507 $ 72,862 December 31, 2014 Gross $ 79,805 $ 370,412 $ 325,154 $ 159,240 Accumulated Amortization (61,619 ) (237,084 ) (219,626 ) (84,935 ) Net $ 18,186 $ 133,328 $ 105,528 $ 74,305 For the three and six months ended June 30, 2015 and 2014 , 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 June 30, 2015 $ 1,388 $ 12,436 $ 8,121 $ 5,145 For the three months ended June 30, 2014 $ 1,350 $ 9,178 $ 8,440 $ 3,778 For the six months ended June 30, 2015 $ 2,755 $ 24,798 $ 16,278 $ 10,556 For the six months ended June 30, 2014 $ 2,706 $ 17,251 $ 16,873 $ 6,859 The remaining net intangible assets and liabilities, including amounts held for sale, as of June 30, 2015 , 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 six months ending December 31, 2015 $ 2,186 $ 21,398 $ 14,204 $ 9,174 For the years ending December 31: 2016 4,039 32,271 23,446 14,612 2017 1,920 19,838 15,952 9,558 2018 1,081 13,497 11,051 7,441 2019 1,035 12,041 9,943 6,737 2020 996 10,126 8,433 5,543 Thereafter 4,982 26,754 14,478 19,797 $ 16,239 $ 135,925 $ 97,507 $ 72,862 Intangible Assets and Liabilities Arising from In-Place Leases where Columbia Property Trust Is the Lessee In-place ground leases where Columbia Property Trust is the lessee may have value associated with effective contractual rental rates that are above or below market rates at the time of execution or assumption. Such values are calculated based on the present value (using a discount rate that reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to the in-place lease and (ii) management's estimate of fair market lease rates for the corresponding in-place lease at the time of execution or assumption, measured over a period equal to the remaining non-cancelable terms of the leases, including significantly below-market options for which exercise of the renewal option appears to be reasonably assured. The capitalized 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 and $110.7 million as of June 30, 2015 and December 31, 2014 , respectively, and recognized amortization of these assets of approximately $0.6 million and $0.5 million for the three months ended June 30, 2015 and 2014 , respectively, and approximately $1.3 million and $1.0 million for the six months ended June 30, 2015 and 2014 , respectively. As of June 30, 2015 , the remaining net below-market lease assets will be amortized as follows (in thousands): For the six months ending December 31, 2015 $ 1,274 For the years ending December 31: 2016 2,549 2017 2,549 2018 2,549 2019 2,549 2020 2,549 Thereafter 110,502 $ 124,521 Prepaid Expenses and Other Assets Prepaid expenses and other assets primarily include earnest money deposits, escrow accounts held by lenders to pay future real estate taxes, insurance and tenant improvements, notes receivable, non-tenant receivables, prepaid taxes, insurance and operating costs, certain corporate assets, hotel inventory, and deferred tax assets. Prepaid expenses and other assets will be expensed as incurred. As of December 31, 2014, prepaid expenses and other assets included $27.0 million of earnest money deposits paid in 2014 for the January 2015 property acquisitions described in Note 3, Real Estate Transactions . These deposits were applied to the purchase prices at closing. 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, is 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 (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 (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 June 30, December 31, Derivatives designated as hedging instruments: Interest rate contracts Accounts payable $ (1,373 ) $ (1,968 ) Derivatives not designated as hedging instruments: Interest rate contracts Accounts payable $ — $ (2,633 ) 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. The fair value of Columbia Property Trust's interest rate swaps was $(1.4) million and $(4.6) million at June 30, 2015 and December 31, 2014 , respectively. Three Months Ended Six Months Ended 2015 2014 2015 2014 Market value adjustment to interest rate swaps designated as hedging instruments and included in other comprehensive income $ 436 $ (43 ) $ 595 $ 211 Loss on interest rate swap recognized through earnings $ (2 ) $ (105 ) $ (8 ) $ (335 ) During the periods presented, there was no hedge ineffectiveness required to be recognized into earnings on the interest rate swaps that qualified for hedge accounting treatment. Income Taxes Columbia Property Trust has elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended (the "Code"), and has operated as such beginning with its taxable year ended December 31, 2003. To qualify as a REIT, Columbia Property Trust must meet certain organizational and operational requirements, including a requirement to distribute at least 90% of its REIT taxable income, as defined by the Code, to its stockholders. As a REIT, Columbia Property Trust generally is not subject to income tax on income it distributes to stockholders. Columbia Property Trust's stockholder distributions typically exceed its taxable income due to the inclusion of noncash expenses, such as depreciation, in taxable income. As a result, Columbia Property Trust typically does not incur federal income taxes other than as described in the following paragraph. Columbia Property Trust is, however, subject to certain state and local taxes related to the operations of properties in certain locations, which have been provided for in the accompanying consolidated financial statements. Columbia Property Trust TRS, LLC ("Columbia Property Trust TRS"), Columbia KCP TRS, LLC ("Columbia KCP TRS"), and Columbia Energy TRS, LLC ("Columbia Energy TRS") (collectively, the "TRS Entities") are wholly owned subsidiaries of Columbia Property Trust, are organized as Delaware limited liability companies, and operate, among other things, office properties that Columbia Property Trust does not intend to hold long term and a full-service hotel. 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. Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update 2014-09, Revenue from Contracts with Customers ("ASU 2014-09"), which establishes a comprehensive model to account for revenue 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, including 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. ASU 2014-09 will be effective retrospectively for Columbia Property Trust beginning on January 1, 2018, and early adoption is permitted beginning January 1, 2017. We do not believe that ASU 2014-09 will have a material impact on our financial statements and disclosures. In August 2014, the FASB issued Accounting Standards Update 2014-15, Presentation of Financial Statements – Going Concern ("ASU 2014-15"), which provides guidance about the responsibility of management to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern and to provide related footnote disclosures if necessary. ASU 2014-15 will be effective prospectively for Columbia Property Trust beginning on January 1, 2017, and early adoption is permitted. Columbia Property Trust does not expect the adoption of ASU 2014-15 to have a material impact on its financial statements and disclosures. In February 2015, the FASB issued Accounting Standards Update 2015-02, Amendments to the Consolidation Analysis ("ASU 2015-02"), which requires the reevaluation of certain legal entities for consolidation, including limited partnerships, variable interest entities ("VIEs"), and reporting entities that are involved with VIEs. ASU 2015-02 will be effective retrospectively for Columbia Property Trust beginning on January 1, 2017, and early adoption is permitted. Columbia Property Trust does not expect the adoption of ASU 2015-02 to have a material impact on its financial statements and disclosures. In April 2015, the FASB issued Accounting Standards Update 2015-03, Simplifying the Presentation of Debt Issuance Costs ("ASU 2015-03"), which requires that deferred financing costs be presented on the balance sheet as a direct deduction of the carrying amount of the related debt. ASU 2015-03 will be effective retrospectively for Columbia Property Trust beginning on January 1, 2016, and early adoption is permitted. Columbia Property Trust is currently in the process of evaluating additional potential impacts of ASU 2015-03 will have on its financial statements and disclosures.

Real Estate Transactions

Real Estate Transactions	6 Months Ended
	Jun. 30, 2015
Real Estate [Abstract]
Real Estate Transactions	Real Estate Transactions During the six months ended June 30, 2015 and 2014 , Columbia Property Trust acquired the following properties (in thousands): 315 Park Avenue South Building 1881 Campus Commons Building 116 Huntington 221 Main Street Building Location New York, NY Reston, VA Boston, MA San Francisco, CA Date Acquired January 7, 2015 January 7, 2015 January 8, 2015 April 22, 2014 Purchase price: Land $ 119,633 $ 7,179 $ — $ 60,509 Building and improvements 232,598 49,273 108,383 — Intangible lease assets 16,912 4,643 7,907 161,853 Intangible below market ground lease assets — — 30,244 12,776 Intangible lease origination costs 4,148 1,603 2,669 3,475 Intangible below market lease liability (7,487 ) (97 ) (1,878 ) (10,323 ) Total purchase price $ 365,804 $ 62,601 $ 147,325 $ 228,290 Note 2, Summary of Significant Accounting Policies , provides a discussion of the estimated useful life for each asset class. 2015 Acquisitions The January 2015 acquisitions of the 315 Park Avenue South Building, the 1881 Campus Commons Building, and the 116 Huntington Avenue Building were funded with proceeds from the issuance of $350.0 million of bonds payable due in 2025, proceeds from the JPMorgan Chase Credit Facility, and cash on hand. Portfolio Acquisition - 315 Park Avenue South Building & 1881 Campus Commons Building On January 7, 2015, Columbia Property Trust acquired a portfolio of two assets, which included 315 Park Avenue South, a 327,000 -square-foot office building in New York, New York (the "315 Park Avenue South Building") and 1881 Campus Commons, a 245,000 -square-foot office building in Reston, Virginia (the "1881 Campus Commons Building"). This portfolio was acquired for $436.0 million , exclusive of transaction costs and purchase price adjustments. As of the acquisition date, the 315 Park Avenue South Building was 94.9% leased to nine tenants, including Credit Suisse ( 74% ). For the period from January 7, 2015 to June 30, 2015 , Columbia Property Trust recognized revenues of $12.9 million and a net loss of $2.6 million from the 315 Park Avenue South Building. The net loss includes acquisition expenses of $1.2 million . As of the acquisition date, the 1881 Campus Commons Building was 78.0% leased to 15 tenants, including SOS International ( 15% ) and Siemens ( 12% ). For the period from January 7, 2015 to June 30, 2015 , Columbia Property Trust recognized revenues of $3.0 million and a net loss of $1.1 million from the 1881 Campus Commons Building. The net loss includes acquisition expenses of $0.5 million . 116 Huntington Avenue Building On January 8, 2015, Columbia Property Trust acquired a 271,000 -square-foot office building in Boston, Massachusetts (the "116 Huntington Avenue Building"), for $152.0 million , inclusive of capital credits. As of the acquisition date, the 116 Huntington Avenue Building was 78.0% leased to 17 tenants, including American Tower ( 21% ), GE Healthcare ( 13% ), and Brigham and Women's ( 12% ). For the period from January 8, 2015 to June 30, 2015 , Columbia Property Trust recognized revenues of $5.6 million and a net loss of $0.4 million from the 116 Huntington Avenue Building. The net loss includes acquisition expenses of $0.3 million . 2014 Acquisition On April 22, 2014, Columbia Property Trust acquired the 221 Main Street Building, a 375,000 -square-foot office building in San Francisco, California, for $228.8 million , exclusive of closing costs. The acquisition was funded with a $73.0 million assumed mortgage note, $116.0 million of borrowings on the JPMorgan Chase Credit Facility, and cash on hand. As of the acquisition date, the 221 Main Street Building was 82.8% leased to 40 tenants, including DocuSign, Inc. ( 15.7% ). No other tenants lease more than 10% of the building based on annualized lease revenue. Columbia Property Trust recognized revenues of $3.4 million and a net loss of $7.5 million from the 221 Main Street Building acquisition for the period from April 22, 2014 to June 30, 2014 . The net loss includes acquisition-related expenses of $6.1 million . Proforma Financial Information The following unaudited pro forma statements of operations presented for the three and six months ended June 30, 2015 and 2014 , have been prepared for Columbia Property Trust to give effect to the acquisitions of the 315 Park Avenue South Building, the 1881 Campus Commons Building, the 116 Huntington Avenue Building, and the 221 Main Street Building as if the acquisitions occurred on January 1, 2014. The following unaudited pro forma financial results for Columbia Property Trust have been prepared for informational purposes only and are not necessarily indicative of future results or of actual results that would have been achieved had these acquisitions been consummated as of January 1, 2014 (in thousands). Three Months Ended Six Months Ended 2015 2014 2015 2014 Revenues $ 148,124 $ 147,348 $ 296,382 $ 289,145 Net income (loss) $ 8,709 $ 11,595 $ 16,194 $ (4,561 ) Net income (loss) per share - basic $ 0.07 $ 0.09 $ 0.13 $ (0.04 ) Net income (loss) per share - diluted $ 0.07 $ 0.09 $ 0.13 $ (0.04 ) 2015 Dispositions On July 1, 2015, Columbia Property Trust announced the sale of 11 properties to an unaffiliated third party for $433.3 million , exclusive of closing costs (the "11 Property Sale"). Proceeds from 10 of the properties were available on July 1, 2015, and the remaining proceeds are expected to be available in early August. Columbia Property Trust anticipates recognizing a gain of approximately $20 million from the 11 Property Sale in the third quarter of 2015. The following properties comprise the 11 Property Sale: 170 Park Avenue Bannockburn Lake III Acxiom 180 Park Avenue 544 Lakeview 215 Diehl Road Robbins Road Highland Landmark III 1580 West Nursery 550 King Street The Corridors III 2014 Dispositions During the six months ended June 30, 2014 , Columbia Property Trust disposed of the following properties: 160 Park Avenue Building On June 4, 2014, Columbia Property Trust closed on the sale of the 160 Park Avenue Building in Florham Park, New Jersey, for $10.2 million , exclusive of transaction costs. Columbia Property Trust recognized an impairment loss of $13.6 million related to this building in the first quarter of 2014, as further described in Note 2, Significant Accounting Policies . 200 South Orange Building On June 30, 2014, Columbia Property Trust closed on the sale of the 200 South Orange Building in Orlando, Florida, for $18.8 million , exclusive of transaction costs. This transaction resulted in a $1.4 million impairment loss (see Note 2, Summary of Significant Accounting Policies , for additional details).

Line of Credit, Term Loan, and

Line of Credit, Term Loan, and Notes Payable	6 Months Ended
	Jun. 30, 2015
Debt Disclosure [Abstract]
Line of Credit, Term Loan, and Notes Payable	Line of Credit, Term Loan, and Notes Payable As of June 30, 2015 and December 31, 2014 , Columbia Property Trust had the following line of credit, term loan, and notes payable indebtedness, including liabilities held for sale (excluding bonds payable; see Note 5, Bonds Payable ) in thousands: Facility June 30, December 31, $450 Million Term Loan $ 450,000 $ 450,000 Market Square Buildings mortgage note 325,000 325,000 JPMorgan Chase Credit Facility 316,000 — 650 California Street Building mortgage note 130,000 130,000 100 East Pratt Street Building mortgage note 105,000 105,000 221 Main Street Building mortgage note 73,000 73,000 263 Shuman Boulevard Building mortgage note 49,000 49,000 SanTan Corporate Center mortgage notes 39,000 39,000 One Glenlake Building mortgage note 30,696 32,074 215 Diehl Road Building mortgage note 21,000 21,000 333 Market Street Building mortgage note — 206,810 Total indebtedness $ 1,538,696 $ 1,430,884 Term Loans On July 30, 2015, Columbia Property Trust replaced its $450 Million Term Loan, which had a maturity date of February 2016, with two separate term loans. Columbia Property Trust entered into a $300 million unsecured, single-draw term loan (the "$300 Million Term Loan") with a syndicate of banks with J.P. Morgan Securities, LLC and PNC Capital Markets LLC serving as joint lead arrangers and joint book runners. The $300 Million Term Loan matures on July 31, 2020. Columbia Property Trust also entered into a $150 million unsecured, single-draw term loan (the "$150 Million Term Loan") with a syndicate of banks with Wells Fargo Securities LLC, U.S. Bank National Association and Regions Capital Markets serving as joint lead arrangers and joint bookrunners. The $150 Million Term Loan matures on July 30, 2022. The $300 Million Term Loan bears interest, at Columbia Property Trust's option, at LIBOR, plus an applicable margin ranging from 0.90% to 1.75% for LIBOR Loans, or an alternate base rate, plus an applicable margin ranging from 0.00% to 0.75% for base rate loans, based on Columbia Property Trust’s applicable credit rating. The $300 Million Term Loan and the JPMorgan Chase Credit Facility, as described below, provide for four accordion options for an aggregate amount of up to $400 million , subject to certain conditions. The $150 Million Term Loan bears interest, at Columbia Property Trust's option, at LIBOR, plus an applicable margin ranging from 1.40% to 2.35% for LIBOR Loans, or an alternate base rate, plus an applicable margin ranging from 0.40% to 1.35% for base rate loans, based on Columbia Property Trust’s applicable credit rating. The interest rate on the $150 Million Term Loan has been effectively fixed at 3.52% with an interest rate swap agreement. The $150 Million Term Loan provides for four accordion options for an aggregate amount of $300 million , subject to certain conditions. These new term loans contain revised restrictive covenants. The $450 Million Term Loan bore interest at LIBOR, plus an applicable margin ranging from 1.15% to 1.95% for LIBOR Loans, or an alternate base rate, plus an applicable margin ranging from 0.15% to 0.95% for base rate loans, based on Columbia Property Trust's applicable credit rating. The interest rate on the $450 Million Term Loan was effectively fixed at 2.07% with an interest rate swap agreement, which was designated as a cash flow hedge. JPMorgan Chase Credit Facility On July 30, 2015, Columbia Property Trust also replaced its revolving credit facility (the "JPMorgan Chase Credit Facility") with J.P. Morgan Securities, LLC and PNC Capital Markets LLC serving as joint lead arrangers and joint book runners, to, among other things: (i) change the margins on the interest rate under the facility, as described below; (ii) extend the maturity date from August 2017 to July 2019 with two, six-month extension options; (iii) enable Columbia Property Trust to increase the JPMorgan Chase Credit Facility and the $300 Million Term Loan, as described above, by an aggregate amount of up to $400 million on four occasions; and (iv) revise certain covenants under the facility. The JPMorgan Chase Credit Facility, as entered into on July 30, 2015, bears interest, at Columbia Property Trust's option, at LIBOR, plus an applicable margin ranging from 0.875% to 1.55% for LIBOR based borrowings, or an alternate base rate, plus an applicable margin ranging from 0.00% to 0.55% for base rate borrowings, based on Columbia Property Trust's applicable credit rating. Previously, the applicable margin was a range from 1.00% to 1.70% for LIBOR based borrowings or a range from 0.00% to 0.70% for base rate borrowings. Additionally, the per annum facility fee on the aggregate revolving commitment (used or unused) now ranges from 0.125% to 0.30% , also based on Columbia Property Trust's applicable credit rating. Prior to amendment, the per annum facility fee ranged from 0.15% to 0.35% . Fair Value of Debt The estimated fair value of Columbia Property Trust's line of credit and notes payable as of June 30, 2015 and December 31, 2014 , was approximately $1,568.8 million and $1,465.2 million , respectively. Columbia Property Trust estimated the fair value of its JPMorgan Chase Credit Facility (the "JPMorgan Chase 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 six months ended June 30, 2015 and 2014 , Columbia Property Trust made interest payments totaling approximately $30.7 million and $27.2 million , respectively, of which approximately $0.2 million was capitalized during the six months ended June 30, 2015 , and no interest was capitalized during the six months ended June 30, 2014 . As of June 30, 2015 , Columbia Property Trust believes it was in compliance with the restrictive financial covenants on its $450 Million Term Loan (the "$450 Million Term Loan"), JPMorgan Chase Credit Facility, and notes payable obligations. Debt Repayments On March 12, 2015, Columbia Property Trust fully repaid a $300.0 million six -month, unsecured loan (the "Bridge Loan") with proceeds from the 2025 Bonds Payable, as described in Note 5, Bonds Payable . The Bridge Loan was set to mature on July 6, 2015. Columbia Property Trust recognized a loss on early extinguishment of debt of $0.5 million as a result of writing off the unamortized deferred financing costs relating to the Bridge Loan. On June 1, 2015 , Columbia Property Trust repaid the mortgage note for the 333 Market Street Building for $206.5 million and the related interest rate swap agreement matured. The maturity date for the 333 Market Street Building mortgage note was July 1, 2015 . On July 1, 2015 , in connection with the 11 Property Sale, Columbia Property Trust repaid the mortgage note for the 215 Diehl Road Building, one of the properties included in the 11 Property Sale, for $21.0 million . The maturity date for the 215 Diehl Road Building mortgage note was July 1, 2017 . On July 13, 2015 , Columbia Property Trust repaid the mortgage note for the 100 East Pratt Street Building for $105.0 million . The maturity date for the 100 East Pratt Street Building mortgage note was June 11, 2017 .

Bonds Payable

Bonds Payable	6 Months Ended
	Jun. 30, 2015
Debt Disclosure [Abstract]
Bonds Payable	Bonds Payable In March 2015, Columbia Property Trust OP issued $350.0 million of ten -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 will be 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 . In 2011, Columbia Property Trust OP issued $250.0 million of seven -year, unsecured 5.875% senior notes at 99.295% of their face value (the "2018 Bonds Payable"), which are guaranteed by Columbia Property Trust. Columbia Property Trust OP received proceeds from the 2018 Bonds Payable, net of fees, of $246.7 million . The 2018 Bonds Payable require semi-annual interest payments in April and October based on a contractual annual interest rate of 5.875% , which is subject to adjustment in certain circumstances. In the accompanying consolidated balance sheets, the 2018 Bonds Payable are shown net of the initial issuance discount of approximately $1.8 million , which is amortized to interest expense over the term of the 2018 Bonds Payable using the effective interest method. The principal amount of the 2018 Bonds Payable is due and payable on the maturity date, April 1, 2018 . Interest payments of $7.3 million were made on the 2018 Bonds Payable during the six months ended June 30, 2015 and 2014 , respectively. The first interest payment on the 2025 Bonds Payable will be made in October 2015. Columbia Property Trust is subject to substantially similar covenants under the 2025 Bonds Payable and the 2018 Bonds Payable. As of June 30, 2015 , Columbia Property Trust believes it was in compliance with the restrictive covenants on the 2025 Bonds Payable and the 2018 Bonds Payable. The estimated fair value of the 2025 Bonds Payable and the 2018 Bonds Payable as of June 30, 2015 , was approximately $602.5 million , and the estimated fair value of the 2018 Bonds Payable as of December 31, 2014 , was $250.6 million . The fair value of the 2025 Bonds Payable and the 2018 Bonds Payable was estimated based on discounted cash flow analyses using the current incremental borrowing rates for similar types of borrowings as the 2025 Bonds Payable and the 2018 Bonds Payable arrangements as of the respective reporting dates (Level 2). The discounted cash flow method of assessing fair value results in a general approximation of value, and such value may never actually be realized.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2015
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 June 30, 2015 , no such options have been exercised that have not been materially satisfied. 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.

Stockholder's Equity

Stockholder's Equity	6 Months Ended
	Jun. 30, 2015
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity Long-Term Incentive Plan Columbia Property Trust maintains a long-term incentive plan that provides for grants of stock to be made to certain employees and independent directors of Columbia Property Trust (the "LTIP"). Columbia Property Trust's shareholders approved the LTIP in July 2013, and a total of 2,000,000 shares are authorized and reserved for issuance under the LTIP. On January 21, 2015, Columbia Property Trust granted 123,187 shares of common stock to employees, net of 11,368 shares withheld to settle the related tax liability, under the LTIP (the "2014 LTIP Employee Grant"), of which 25% vested upon grant, and the remaining shares will vest ratably, with the passage of time, on January 31, 2016, 2017, and 2018. Employees will 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 six months ended June 30, 2015 and 2014 , follows: For the Six Months Ended Shares (in thousands) Weighted-Average Grant-Date Fair Value (1) Unvested shares - beginning of period 104 $ 24.82 Granted 123 $ 24.40 Vested (74 ) $ 24.60 Forfeited (2 ) $ 24.56 Unvested shares - end of period (2) 151 $ 24.59 (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 June 30, 2015 , we expect approximately 143,000 of the 151,000 unvested shares to ultimately vest, assuming a forfeiture rate of 5.0% , which was determined based on peer company data, adjusted for the specifics of the LTIP. During the six months ended June 30, 2015 and 2014 , Columbia Property Trust paid quarterly installments of the independent directors' annual equity retainers by granting shares to the independent directors, which vested at the time of grant. A summary of these grants, made under the LTIP, follows: Date of Grant Shares Grant-Date Fair Value 2015 Director Grants: January 2, 2015 5,850 $ 25.75 April 1, 2015 4,995 $ 27.16 July 1, 2015 4,144 $ 24.84 2014 Director Grants: January 21, 2014 3,344 $ 24.82 April 1, 2014 2,968 $ 27.22 July 1, 2014 3,016 $ 25.78 For the three and six months ended June 30, 2015 and 2014 , Columbia Property Trust incurred the stock-based compensation expense related to the following events (in thousands): Three Months Ended Six Months Ended 2015 2014 2015 2014 Amortization of unvested LTIP awards $ 364 $ 212 $ 927 $ 460 Future employee awards (1) 516 223 816 399 Issuance of shares to independent directors 135 81 286 164 Total stock-based compensation expense $ 1,015 $ 516 $ 2,029 $ 1,023 (1) These future employee awards relate to service during the period, to be granted in January of the subsequent year, with 25% vesting on the date of grant, and the remaining 75% vesting ratably on January 31st of each of the following three years. These expenses are included in general and administrative expenses in the accompanying consolidated statements of operations. As of June 30, 2015 and December 31, 2014 , there was $2.8 million and $1.7 million , respectively, of unrecognized compensation costs related to unvested awards under the LTIP. This amount will be amortized over the respective vesting period, ranging from one to three years at the time of grant.

Supplemental Disclosures of Non

Supplemental Disclosures of Noncash Investing and Financing Activities	6 Months Ended
	Jun. 30, 2015
Supplemental Cash Flow Information [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 six months ended June 30, 2015 and 2014 (in thousands): Six Months Ended 2015 2014 Investments in real estate funded with other assets $ 27,000 $ 3,807 Other assets assumed at acquisition $ 6,119 $ 501 Other liabilities assumed at acquisition $ 3,572 $ 589 Notes payable assumed at acquisition $ — $ 73,000 Discount on issuance of bonds payable $ 494 $ — Amortization of net (premiums) discounts on debt $ (169 ) $ 178 Market value adjustment to interest rate swaps that qualify for hedge accounting treatment $ 595 $ 211 Accrued capital expenditures and deferred lease costs $ 15,218 $ 18,431 Accrued deferred financing costs $ 19 $ 31 Common stock issued to employees and directors, and amortized (net of amounts withheld for income taxes) $ 1,300 $ 708

Held for Sale and Discontinued

Held for Sale and Discontinued Operations	6 Months Ended
	Jun. 30, 2015
Discontinued Operation, Additional Disclosures [Abstract]
Held for Sale and Discontinued Operations	Held for Sale and Discontinued Operations Held for Sale In accordance with GAAP, assets and liabilities that meet certain criteria for disposal are required to be classified as held for sale. As of June 30, 2015 , the properties included in the 11 Property Sale were subject to a firm sales contract and, thus, are classified as held for sale in the accompanying consolidated balance sheet as of that date. This transaction closed in the third quarter of 2015 (see Note 3, Real Estate Transactions ). The major classes of assets and liabilities classified as held for sale as of June 30, 2015 , are provided below (in thousands): June 30, 2015 Real estate assets held for sale: Real estate assets, at cost: Land $ 62,874 Buildings and improvements, less accumulated depreciation of $103,214 298,415 Intangible lease assets, less accumulated amortization of $36,606 10,951 Construction in progress 244 Total real estate assets held for sale, net $ 372,484 Other assets held for sale: Tenant receivables $ 1,196 Straight-line rent receivable 13,737 Prepaid expenses and other assets 715 Deferred financing costs, less accumulated amortization of $111 28 Intangible lease origination costs, less accumulated amortization of $38,722 13,100 Deferred lease costs, less accumulated amortization of $3,348 8,102 Total other assets held for sale, net $ 36,878 Liabilities held for sale: Mortgage note payable $ 21,000 Accounts payable, accrued expenses, and accrued capital expenditures 4,708 Deferred income 1,056 Intangible lease liabilities, less accumulated amortization of $3,662 1,475 Total liabilities held for sale, net $ 28,239 Discontinued Operations As a result of implementing Accounting Standards Update 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components on an Entity ("ASU 2014-08") effective April 1, 2014, beginning in the second quarter of 2014, the operating results for properties sold are included in continuing operations. Properties sold prior to implementing ASU 2014-08 are included in discontinued operations in the accompanying consolidated statements of operations for all periods presented. Columbia Property Trust sold 18 properties for $521.5 million in November 2013, resulting in a net loss of $0.4 million (the "18 Property Sale"). The activity reflected in 2014 relates to post-closing adjustments and true ups related to this 18 Property Sale. For the Three Months Ended June 30, 2014 For the Six Months Ended June 30, 2014 Revenues: Rental income $ 1 $ 4 Tenant reimbursements 151 100 152 104 Expenses: Property operating costs 82 (265 ) Asset and property management fees — 7 General and administrative 110 128 Total expenses 192 (130 ) Operating income (loss) (40 ) 234 Other income (expense): Interest and other income — 3 Income (loss) from discontinued operations (40 ) 237 Loss on disposition of discontinued operations (650 ) (978 ) Loss from discontinued operations $ (690 ) $ (741 )

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2015
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share For the three and six months ended June 30, 2015 and 2014 , the basic and diluted earnings per-share computations, net income, and income from continuing operations have been reduced for the dividends paid on unvested shares related to unvested awards under the LTIP and future employee awards, which relate to service in the current period and will be granted in January of the subsequent year. The following table reconciles the numerator for the basic and diluted earnings per share computations shown on the consolidated statements of income for the three and six months ended June 30, 2015 and 2014 , respectively (in thousands): Three Months Ended Six Months Ended 2015 2014 2015 2014 Net income $ 8,709 $ 8,021 $ 14,307 $ 11,421 Distributions paid on unvested shares (45 ) (32 ) (94 ) (64 ) Net income used to calculate basic and diluted earnings per share $ 8,664 $ 7,989 $ 14,213 $ 11,357 The following table reconciles the denominator for the basic and diluted earnings per-share computations shown on the consolidated statements of income for the three and six months ended June 30, 2015 and 2014 , respectively (in thousands): Three Months Ended Six Months Ended 2015 2014 2015 2014 Weighted-average common shares - basic 124,925 124,860 124,914 124,855 Plus incremental weighted-average shares from time-vested conversions, less assumed share repurchases: Previously granted LTIP awards, unvested 37 27 26 25 Future LTIP awards for 2015 55 32 41 21 Weighted-average common shares - diluted 125,017 124,919 124,981 124,901

Financial Information for Paren

Financial Information for Parent Guarantor, Other Guarantor Subsidiaries and Non-Guarantor Subsidiaries	6 Months Ended
	Jun. 30, 2015
Financial Information for Parent Guarantor, Other Guarantor Subsidiaries and Non Guarantor Subsidiaries [Abstract]
Financial Information for Parent Guarantor, Issuer Subsidiary and Non-Guarantor Subsidiaries	Financial Information for Parent Guarantor, Issuer Subsidiary, and Non-Guarantor Subsidiaries The 2025 Bonds Payable and the 2018 Bonds Payable (see Note 5, 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 2025 Bonds Payable or the 2018 Bonds Payable. Columbia Property Trust uses the equity method with respect to its investment in subsidiaries included in its condensed consolidating financial statements. Set forth below are Columbia Property Trust's condensed consolidating balance sheets as of June 30, 2015 and December 31, 2014 (in thousands), as well as its condensed consolidating statements of operations and its condensed consolidating statements of comprehensive income for the three and six months ended June 30, 2015 and 2014 (in thousands); and its condensed consolidating statements of cash flows for the six months ended June 30, 2015 and 2014 (in thousands). Condensed Consolidating Balance Sheets (in thousands) As of June 30, 2015 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating adjustments Columbia Property Trust Assets: Real estate assets, at cost: Land $ — $ 6,241 $ 842,801 $ — $ 849,042 Buildings and improvements, net — 29,887 3,041,448 — 3,071,335 Intangible lease assets, net — — 265,735 — 265,735 Construction in progress — 160 39,617 — 39,777 Real estate assets held for sale, net — — 372,484 — 372,484 Total real estate assets — 36,288 4,562,085 — 4,598,373 Cash and cash equivalents 673 11,908 21,161 — 33,742 Investment in subsidiaries 2,353,776 1,956,722 — (4,310,498 ) — Tenant receivables, net of allowance — 22 8,529 — 8,551 Straight-line rent receivable — 1,194 106,533 — 107,727 Prepaid expenses and other assets 320,186 147,131 23,547 (461,954 ) 28,910 Deferred financing costs, net — 7,773 2,038 — 9,811 Intangible lease origination costs, net — — 84,407 — 84,407 Deferred lease costs, net — 1,545 96,289 — 97,834 Investment in development authority bonds — — 120,000 — 120,000 Other assets held for sale, net — — 36,878 — 36,878 Total assets $ 2,674,635 $ 2,162,583 $ 5,061,467 $ (4,772,452 ) $ 5,126,233 Liabilities: Line of credit and notes payable $ — $ 766,000 $ 1,208,624 $ (456,928 ) $ 1,517,696 Bonds payable, net — 598,829 — — 598,829 Accounts payable, accrued expenses, and accrued capital expenditures 1 13,169 79,974 — 93,144 Due to affiliates — 33 4,651 (4,684 ) — Deferred income — 388 21,916 — 22,304 Intangible lease liabilities, net — — 71,387 — 71,387 Obligations under capital leases — — 120,000 — 120,000 Liabilities held for sale, net — — 28,581 (342 ) 28,239 Total liabilities 1 1,378,419 1,535,133 (461,954 ) 2,451,599 Equity: Total equity 2,674,634 784,164 3,526,334 (4,310,498 ) 2,674,634 Total liabilities and equity $ 2,674,635 $ 2,162,583 $ 5,061,467 $ (4,772,452 ) $ 5,126,233 Condensed Consolidating Balance Sheets (in thousands) As of December 31, 2014 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating adjustments Columbia Property Trust Assets: Real estate assets, at cost: Land $ — $ 6,241 $ 778,860 $ — $ 785,101 Building and improvements, net — 29,899 2,996,532 — 3,026,431 Intangible lease assets, net — — 247,068 — 247,068 Construction in progress — 433 17,529 — 17,962 Total real estate assets — 36,573 4,039,989 — 4,076,562 Cash and cash equivalents 119,488 10,504 19,798 — 149,790 Investment in subsidiaries 2,409,941 2,120,018 — (4,529,959 ) — Tenant receivables, net of allowance — 246 6,699 — 6,945 Straight-line rent receivable — 781 115,708 — 116,489 Prepaid expenses and other assets 204,079 148,226 19,734 (319,896 ) 52,143 Deferred financing costs, net — 6,020 2,406 — 8,426 Intangible lease origination costs, net — — 105,528 — 105,528 Deferred lease costs, net — 1,658 101,337 — 102,995 Investment in development authority bonds — — 120,000 — 120,000 Total assets $ 2,733,508 $ 2,324,026 $ 4,531,199 $ (4,849,855 ) $ 4,738,878 Liabilities: Lines of credit and notes payable $ — $ 450,000 $ 1,299,232 $ (318,348 ) $ 1,430,884 Bonds payable, net — 249,182 — — 249,182 Accounts payable, accrued expenses, and accrued capital expenditures 30 9,749 96,497 — 106,276 Due to affiliates — 24 1,524 (1,548 ) — Deferred income — 171 24,582 — 24,753 Intangible lease liabilities, net — — 74,305 — 74,305 Obligations under capital leases — — 120,000 — 120,000 Total liabilities 30 709,126 1,616,140 (319,896 ) 2,005,400 Equity: Total equity 2,733,478 1,614,900 2,915,059 (4,529,959 ) 2,733,478 Total liabilities and equity $ 2,733,508 $ 2,324,026 $ 4,531,199 $ (4,849,855 ) $ 4,738,878 Consolidating Statements of Operations (in thousands) For the Three Months Ended June 30, 2015 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating adjustments Columbia Property Trust Revenues: Rental income $ — $ 622 $ 112,384 $ (90 ) $ 112,916 Tenant reimbursements — 286 26,233 — 26,519 Hotel income — — 6,964 — 6,964 Other property income — — 1,814 (89 ) 1,725 — 908 147,395 (179 ) 148,124 Expenses: Property operating costs — 720 47,453 (90 ) 48,083 Hotel operating costs — — 5,147 — 5,147 Asset and property management fees: Related-party — 26 — (26 ) — Other — — 503 — 503 Depreciation — 632 33,181 — 33,813 Amortization — 57 23,681 — 23,738 General and administrative 36 2,193 4,914 (63 ) 7,080 Acquisition expenses — 11 (11 ) — — 36 3,639 114,868 (179 ) 118,364 Real estate operating income (loss) (36 ) (2,731 ) 32,527 — 29,760 Other income (expense): Interest expense — (11,242 ) (19,296 ) 7,773 (22,765 ) Interest and other income 5,127 2,646 1,807 (7,773 ) 1,807 Loss on interest rate swaps — — (2 ) — (2 ) Income from equity investment 3,618 13,114 — (16,732 ) — 8,745 4,518 (17,491 ) (16,732 ) (20,960 ) Income before income tax expense 8,709 1,787 15,036 (16,732 ) 8,800 Income tax expense — (6 ) (85 ) — (91 ) Net income $ 8,709 $ 1,781 $ 14,951 $ (16,732 ) $ 8,709 Consolidating Statements of Operations (in thousands) For the Three Months Ended June 30, 2014 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating adjustments Columbia Property Trust Revenues: Rental income $ — $ 110 $ 103,802 $ (91 ) $ 103,821 Tenant reimbursements — 43 22,891 — 22,934 Hotel income — — 6,505 — 6,505 Other property income — — 3,555 (58 ) 3,497 — 153 136,753 (149 ) 136,757 Expenses: Property operating costs — 634 38,289 (91 ) 38,832 Hotel operating costs — — 4,689 — 4,689 Asset and property management fees: Related-party — 4 — (4 ) — Other — — 675 — 675 Depreciation — 405 29,764 — 30,169 Amortization — 13 20,208 — 20,221 Impairment loss on real estate assets — — 1,432 — 1,432 General and administrative 47 2,597 5,822 (54 ) 8,412 Acquisition expenses — — 6,102 — 6,102 47 3,653 106,981 (149 ) 110,532 Real estate operating income (loss) (47 ) (3,500 ) 29,772 — 26,225 Other income (expense): Interest expense — (7,779 ) (15,753 ) 4,672 (18,860 ) Interest and other income 1,988 2,686 1,800 (4,672 ) 1,802 Loss on interest rate swaps — — (105 ) — (105 ) Income from equity investment 6,080 12,848 — (18,928 ) — 8,068 7,755 (14,058 ) (18,928 ) (17,163 ) Income before income tax expense 8,021 4,255 15,714 (18,928 ) 9,062 Income tax expense — (1 ) (350 ) — (351 ) Income from continuing operations 8,021 4,254 15,364 (18,928 ) 8,711 Discontinued operations: Operating loss from discontinued operations — — (40 ) — (40 ) Loss on disposition of discontinued operations — — (650 ) — (650 ) Loss from discontinued operations — — (690 ) — (690 ) Net income $ 8,021 $ 4,254 $ 14,674 $ (18,928 ) $ 8,021 Consolidating Statements of Operations (in thousands) For the Six Months Ended June 30, 2015 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating adjustments Columbia Property Trust Revenues: Rental income $ — $ 1,218 $ 224,691 $ (184 ) $ 225,725 Tenant reimbursements — 514 54,254 — 54,768 Hotel income — — 11,957 — 11,957 Other property income — — 3,377 (160 ) 3,217 — 1,732 294,279 (344 ) 295,667 Expenses: Property operating costs — 1,509 96,512 (184 ) 97,837 Hotel operating costs — — 9,738 — 9,738 Asset and property management fees: Related-party — 40 — (40 ) — Other — — 900 — 900 Depreciation — 1,256 66,564 — 67,820 Amortization — 113 46,844 — 46,957 General and administrative 75 4,151 11,018 (120 ) 15,124 Acquisition expenses — 11 1,984 — 1,995 75 7,080 233,560 (344 ) 240,371 Real estate operating income (loss) (75 ) (5,348 ) 60,719 — 55,296 Other income (expense): Interest expense — (20,467 ) (36,196 ) 12,414 (44,249 ) Interest and other income 7,118 5,303 3,633 (12,414 ) 3,640 Loss on interest rate swaps — — (8 ) — (8 ) Loss on early extinguishment of debt — (477 ) — — (477 ) Income from equity investment 7,264 25,895 — (33,159 ) — 14,382 10,254 (32,571 ) (33,159 ) (41,094 ) Income before income tax benefit (expense) 14,307 4,906 28,148 (33,159 ) 14,202 Income tax benefit (expense) — (11 ) 116 — 105 Net income $ 14,307 $ 4,895 $ 28,264 $ (33,159 ) $ 14,307 Consolidating Statements of Operations (in thousands) For the Six Months Ended June 30, 2014 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating adjustments Columbia Property Trust Revenues: Rental income $ — $ 219 $ 204,349 $ (180 ) $ 204,388 Tenant reimbursements — 89 46,578 — 46,667 Hotel income — — 10,566 — 10,566 Other property income — — 4,399 (95 ) 4,304 — 308 265,892 (275 ) 265,925 Expenses: Property operating costs — 1,244 76,748 (180 ) 77,812 Hotel operating costs — — 8,830 — 8,830 Asset and property management fees: Related-party — 8 — (8 ) — Other — — 964 — 964 Depreciation — 786 56,687 — 57,473 Amortization — 22 38,720 — 38,742 Impairment loss on real estate assets — — 14,982 — 14,982 General and administrative 76 5,214 10,155 (87 ) 15,358 Acquisition expenses — — 6,102 — 6,102 76 7,274 213,188 (275 ) 220,263 Real estate operating income (loss) (76 ) (6,966 ) 52,704 — 45,662 Other income (expense): Interest expense — (15,213 ) (30,911 ) 9,354 (36,770 ) Interest and other income 3,976 5,381 3,609 (9,354 ) 3,612 Loss on interest rate swaps — — (335 ) — (335 ) Income from equity investment 7,521 21,454 — (28,975 ) — 11,497 11,622 (27,637 ) (28,975 ) (33,493 ) Income before income tax expense 11,421 4,656 25,067 (28,975 ) 12,169 Income tax expense — (2 ) (5 ) — (7 ) Income from continuing operations 11,421 4,654 25,062 (28,975 ) 12,162 Discontinued operations: Operating income from discontinued operations — — 237 — 237 Loss on disposition of discontinued operations — — (978 ) — (978 ) Loss from discontinued operations — — (741 ) — (741 ) Net income $ 11,421 $ 4,654 $ 24,321 $ (28,975 ) $ 11,421 Consolidating Statements of Comprehensive Income (in thousands) For the Three Months Ended June 30, 2015 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating adjustments Columbia Property Trust Net income $ 8,709 $ 1,781 $ 14,951 $ (16,732 ) $ 8,709 Market value adjustment to interest rate swap 436 436 — (436 ) 436 Comprehensive income $ 9,145 $ 2,217 $ 14,951 $ (17,168 ) $ 9,145 For the Three Months Ended June 30, 2014 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating adjustments Columbia Property Trust Net income $ 8,021 $ 4,254 $ 14,674 $ (18,928 ) $ 8,021 Market value adjustment to interest rate swap (43 ) (43 ) — 43 (43 ) Comprehensive income $ 7,978 $ 4,211 $ 14,674 $ (18,885 ) $ 7,978 For the Six Months Ended June 30, 2015 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating adjustments Columbia Property Trust Net income $ 14,307 $ 4,895 $ 28,264 $ (33,159 ) $ 14,307 Market value adjustment to interest rate swap 595 595 — (595 ) 595 Comprehensive income $ 14,902 $ 5,490 $ 28,264 $ (33,754 ) $ 14,902 For the Six Months Ended June 30, 2014 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating adjustments Columbia Property Trust Net income $ 11,421 $ 4,654 $ 24,321 $ (28,975 ) $ 11,421 Market value adjustment to interest rate swap 211 211 — (211 ) 211 Comprehensive income $ 11,632 $ 4,865 $ 24,321 $ (29,186 ) $ 11,632 Consolidating Statements of Cash Flows (in thousands) For the Six Months Ended June 30, 2015 Columbia Property Trust (Guarantor) Columbia Property Trust OP (the Issuer) Non- Guarantors Eliminations Columbia Property Trust Cash flows from operating activities $ (69 ) $ (22,854 ) $ 131,861 $ — $ 108,938 Cash flows from investing activities: Net proceeds from sale of real estate — — — — — Investment in real estate and related assets (57,198 ) (495,298 ) (50,326 ) — (602,822 ) Investments in subsidiaries (553,272 ) — — 553,272 — Net cash used in investing activities (610,470 ) (495,298 ) (50,326 ) 553,272 (602,822 ) Cash flows from financing activities: Borrowings, net of fees — 1,055,482 — — 1,055,482 Repayments of notes payable — (394,000 ) (207,878 ) — (601,878 ) Distributions (75,046 ) — — — (75,046 ) Shares redeemed to fund income tax withholdings on stock compensation (722 ) — — — (722 ) Intercompany contributions (distributions) 567,492 (141,926 ) 127,706 (553,272 ) — Net cash provided by (used in) financing activities 491,724 519,556 (80,172 ) (553,272 ) 377,836 Net decrease in cash and cash equivalents (118,815 ) 1,404 1,363 — (116,048 ) Cash and cash equivalents, beginning of period 119,488 10,504 19,798 — 149,790 Cash and cash equivalents, end of period $ 673 $ 11,908 $ 21,161 $ — $ 33,742 For the Six Months Ended June 30, 2014 Columbia Property Trust (Guarantor) Columbia Property Trust OP (the Issuer) Non- Guarantors Eliminations Columbia Property Trust Cash flows from operating activities $ (73 ) $ (19,585 ) $ 132,641 $ — $ 112,983 Cash flows from investing activities: Net proceeds from sale of real estate — 27,131 — — 27,131 Investment in real estate and related assets — (157,776 ) (30,782 ) — (188,558 ) Intercompany contributions (distributions) (133,515 ) — — 133,515 — Net cash used in investing activities (133,515 ) (130,645 ) (30,782 ) 133,515 (161,427 ) Cash flows from financing activities: Borrowings, net of fees — 129,807 (605 ) — 129,202 Repayments of line of credit and notes payable — (55,000 ) (1,300 ) — (56,300 ) Distributions (74,979 ) — — — (74,979 ) Intercompany transfers, net 179,565 59,837 (105,887 ) (133,515 ) — Net cash provided by (used in) financing activities 104,586 134,644 (107,792 ) (133,515 ) (2,077 ) Net increase (decrease) in cash and cash equivalents (29,002 ) (15,586 ) (5,933 ) — (50,521 ) Cash and cash equivalents, beginning of period 53,322 20,708 25,825 — 99,855 Cash and cash equivalents, end of period $ 24,320 $ 5,122 $ 19,892 $ — $ 49,334

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2015
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: 11 Property Sale On July 1, 2015, Columbia Property Trust announced the sale of 11 properties, as described in Note 3, Real Estate Transactions . 229 West 43rd Street Purchase Agreement On July 20, 2015, Columbia Property Trust entered an agreement to purchase the office portion, approximately 481,000 square feet, of a 16 -story, 732,000 -square-foot building in Midtown Manhattan (the "229 West 43rd Street Building") for a gross sales price of $516 million . Columbia Property Trust anticipates funding this acquisition with a $300.0 million , six -month bridge loan and additional borrowings under the JPMorgan Chase Credit Facility, and closing on this transaction in August 2015. Loan Repayment On July 13, 2015, Columbia Property Trust repaid the 100 East Pratt Street Building mortgage note, as described in Note 4, Line of Credit, Term Loan, and Notes Payable . Term Loan & JPMorgan Chase Credit Facility On July 30, 2015, Columbia Property Trust closed on two term loans and the replacement of the JPMorgan Chase Credit Facility, as described in Note 4, Line of Credit, Term Loan, and Notes Payable .

Summary of Significant Accoun21

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2015
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 these 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. 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 ("ASC") 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. 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 and 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. Columbia Property Trust considers the period of future benefit of the asset to determine the appropriate useful lives. These assessments have a direct impact on net income. The estimated useful lives of its assets by class are as follows: Buildings 40 years Building and site improvements 5-25 years Tenant improvements Shorter of economic life or lease term Intangible lease assets Lease term
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, in which Columbia Property Trust has an ownership interest, either directly or through investments in joint ventures, 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 operating 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 information, in order of preference, 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 salvage value. Certain of Columbia Property Trust's assets may be carried at more than an amount that could be realized in a current disposition transaction. Columbia Property Trust has determined that there is no additional impairment in the carrying values of our real estate assets and related intangible assets for the six months ended June 30, 2015 . 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. The subjectivity of assumptions used in the future cash flow analysis, including discount rates, could result in an incorrect assessment of the property's fair value and could result in the misstatement of the carrying value of Columbia Property Trust's real estate assets and related intangible assets and liabilities and net income.
Assets Held for Sale	Assets Held for Sale Columbia Property Trust classifies assets as held for sale according to ASC 360, Accounting for the Impairment or Disposal of Long-Lived Assets ("ASC 360"). According to ASC 360, assets 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 sale of the property is probable, and transfer of the property is expected to qualify for recognition as a completed sale, within one year. • 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. At such time that a property is determined to be held for sale, its carrying amount is reduced to the lower of its depreciated book value or its estimated fair value, less costs to sell, and depreciation is no longer recognized.
Intangible Assets and Liabilities Arising from In-Place Leases	Intangible Assets and Liabilities Arising from In-Place Leases where Columbia Property Trust Is the Lessee In-place ground leases where Columbia Property Trust is the lessee may have value associated with effective contractual rental rates that are above or below market rates at the time of execution or assumption. Such values are calculated based on the present value (using a discount rate that reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to the in-place lease and (ii) management's estimate of fair market lease rates for the corresponding in-place lease at the time of execution or assumption, measured over a period equal to the remaining non-cancelable terms of the leases, including significantly below-market options for which exercise of the renewal option appears to be reasonably assured. The capitalized 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. 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 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). When calculating the intangible assets and liabilities for above-market and below-market tenant and ground leases where we are either the lessor or the lessee, the difference between the contractual rental rates and our estimate of market rental rates is measured over a period equal to the remaining non cancelable term of the leases, including significantly below market renewal options for which exercise of the renewal option appears to be reasonably assured. The remaining term of leases with renewal options at terms significantly below market reflect the assumed exercise of such below market renewal options and assume the amortization period would coincide with the extended lease term.
Prepaid Expenses and Other Assets	Prepaid Expenses and Other Assets Prepaid expenses and other assets primarily include earnest money deposits, escrow accounts held by lenders to pay future real estate taxes, insurance and tenant improvements, notes receivable, non-tenant receivables, prepaid taxes, insurance and operating costs, certain corporate assets, hotel inventory, and deferred tax assets. Prepaid expenses and other assets will be expensed as incurred.
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, is 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 (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 (loss) on interest rate swaps for contracts that do not qualify for hedge accounting treatment.
Income Taxes	Income Taxes Columbia Property Trust has elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended (the "Code"), and has operated as such beginning with its taxable year ended December 31, 2003. To qualify as a REIT, Columbia Property Trust must meet certain organizational and operational requirements, including a requirement to distribute at least 90% of its REIT taxable income, as defined by the Code, to its stockholders. As a REIT, Columbia Property Trust generally is not subject to income tax on income it distributes to stockholders. Columbia Property Trust's stockholder distributions typically exceed its taxable income due to the inclusion of noncash expenses, such as depreciation, in taxable income. As a result, Columbia Property Trust typically does not incur federal income taxes other than as described in the following paragraph. Columbia Property Trust is, however, subject to certain state and local taxes related to the operations of properties in certain locations, which have been provided for in the accompanying consolidated financial statements. Columbia Property Trust TRS, LLC ("Columbia Property Trust TRS"), Columbia KCP TRS, LLC ("Columbia KCP TRS"), and Columbia Energy TRS, LLC ("Columbia Energy TRS") (collectively, the "TRS Entities") are wholly owned subsidiaries of Columbia Property Trust, are organized as Delaware limited liability companies, and operate, among other things, office properties that Columbia Property Trust does not intend to hold long term and a full-service hotel. 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.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update 2014-09, Revenue from Contracts with Customers ("ASU 2014-09"), which establishes a comprehensive model to account for revenue 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, including 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. ASU 2014-09 will be effective retrospectively for Columbia Property Trust beginning on January 1, 2018, and early adoption is permitted beginning January 1, 2017. We do not believe that ASU 2014-09 will have a material impact on our financial statements and disclosures. In August 2014, the FASB issued Accounting Standards Update 2014-15, Presentation of Financial Statements – Going Concern ("ASU 2014-15"), which provides guidance about the responsibility of management to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern and to provide related footnote disclosures if necessary. ASU 2014-15 will be effective prospectively for Columbia Property Trust beginning on January 1, 2017, and early adoption is permitted. Columbia Property Trust does not expect the adoption of ASU 2014-15 to have a material impact on its financial statements and disclosures. In February 2015, the FASB issued Accounting Standards Update 2015-02, Amendments to the Consolidation Analysis ("ASU 2015-02"), which requires the reevaluation of certain legal entities for consolidation, including limited partnerships, variable interest entities ("VIEs"), and reporting entities that are involved with VIEs. ASU 2015-02 will be effective retrospectively for Columbia Property Trust beginning on January 1, 2017, and early adoption is permitted. Columbia Property Trust does not expect the adoption of ASU 2015-02 to have a material impact on its financial statements and disclosures. In April 2015, the FASB issued Accounting Standards Update 2015-03, Simplifying the Presentation of Debt Issuance Costs ("ASU 2015-03"), which requires that deferred financing costs be presented on the balance sheet as a direct deduction of the carrying amount of the related debt. ASU 2015-03 will be effective retrospectively for Columbia Property Trust beginning on January 1, 2016, and early adoption is permitted. Columbia Property Trust is currently in the process of evaluating additional potential impacts of ASU 2015-03 will have on its financial statements and disclosures.

Summary of Significant Accoun22

Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2015
Accounting Policies [Abstract]
Schedule of Estimated Useful Lives for Real Estate Assets	The estimated useful lives of its assets by class are as follows: Buildings 40 years Building and site improvements 5-25 years Tenant improvements Shorter of economic life or lease term Intangible lease assets Lease term
Schedule of Intangible Assets and Liabilities	As of June 30, 2015 and December 31, 2014 , Columbia Property Trust had the following gross intangible in-place lease assets and liabilities, including assets and liabilities 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 June 30, 2015 Gross $ 69,903 $ 367,037 $ 315,667 $ 156,131 Accumulated Amortization (53,664 ) (231,112 ) (218,160 ) (83,269 ) Net $ 16,239 $ 135,925 $ 97,507 $ 72,862 December 31, 2014 Gross $ 79,805 $ 370,412 $ 325,154 $ 159,240 Accumulated Amortization (61,619 ) (237,084 ) (219,626 ) (84,935 ) Net $ 18,186 $ 133,328 $ 105,528 $ 74,305 For the three and six months ended June 30, 2015 and 2014 , 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 June 30, 2015 $ 1,388 $ 12,436 $ 8,121 $ 5,145 For the three months ended June 30, 2014 $ 1,350 $ 9,178 $ 8,440 $ 3,778 For the six months ended June 30, 2015 $ 2,755 $ 24,798 $ 16,278 $ 10,556 For the six months ended June 30, 2014 $ 2,706 $ 17,251 $ 16,873 $ 6,859 The remaining net intangible assets and liabilities, including amounts held for sale, as of June 30, 2015 , 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 six months ending December 31, 2015 $ 2,186 $ 21,398 $ 14,204 $ 9,174 For the years ending December 31: 2016 4,039 32,271 23,446 14,612 2017 1,920 19,838 15,952 9,558 2018 1,081 13,497 11,051 7,441 2019 1,035 12,041 9,943 6,737 2020 996 10,126 8,433 5,543 Thereafter 4,982 26,754 14,478 19,797 $ 16,239 $ 135,925 $ 97,507 $ 72,862
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	As of June 30, 2015 , the remaining net below-market lease assets will be amortized as follows (in thousands): For the six months ending December 31, 2015 $ 1,274 For the years ending December 31: 2016 2,549 2017 2,549 2018 2,549 2019 2,549 2020 2,549 Thereafter 110,502 $ 124,521
Schedule of Interest Rate Derivatives	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 June 30, December 31, Derivatives designated as hedging instruments: Interest rate contracts Accounts payable $ (1,373 ) $ (1,968 ) Derivatives not designated as hedging instruments: Interest rate contracts Accounts payable $ — $ (2,633 )
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position	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. The fair value of Columbia Property Trust's interest rate swaps was $(1.4) million and $(4.6) million at June 30, 2015 and December 31, 2014 , respectively. Three Months Ended Six Months Ended 2015 2014 2015 2014 Market value adjustment to interest rate swaps designated as hedging instruments and included in other comprehensive income $ 436 $ (43 ) $ 595 $ 211 Loss on interest rate swap recognized through earnings $ (2 ) $ (105 ) $ (8 ) $ (335 )

Real Estate Transactions (Table

Real Estate Transactions (Tables)	6 Months Ended
	Jun. 30, 2015
Real Estate [Abstract]
Schedule of Real Estate Property Acquired	During the six months ended June 30, 2015 and 2014 , Columbia Property Trust acquired the following properties (in thousands): 315 Park Avenue South Building 1881 Campus Commons Building 116 Huntington 221 Main Street Building Location New York, NY Reston, VA Boston, MA San Francisco, CA Date Acquired January 7, 2015 January 7, 2015 January 8, 2015 April 22, 2014 Purchase price: Land $ 119,633 $ 7,179 $ — $ 60,509 Building and improvements 232,598 49,273 108,383 — Intangible lease assets 16,912 4,643 7,907 161,853 Intangible below market ground lease assets — — 30,244 12,776 Intangible lease origination costs 4,148 1,603 2,669 3,475 Intangible below market lease liability (7,487 ) (97 ) (1,878 ) (10,323 ) Total purchase price $ 365,804 $ 62,601 $ 147,325 $ 228,290
Business Acquisition, Pro Forma Information	The following unaudited pro forma financial results for Columbia Property Trust have been prepared for informational purposes only and are not necessarily indicative of future results or of actual results that would have been achieved had these acquisitions been consummated as of January 1, 2014 (in thousands). Three Months Ended Six Months Ended 2015 2014 2015 2014 Revenues $ 148,124 $ 147,348 $ 296,382 $ 289,145 Net income (loss) $ 8,709 $ 11,595 $ 16,194 $ (4,561 ) Net income (loss) per share - basic $ 0.07 $ 0.09 $ 0.13 $ (0.04 ) Net income (loss) per share - diluted $ 0.07 $ 0.09 $ 0.13 $ (0.04 )

Line of Credit, Term Loan, an24

Line of Credit, Term Loan, and Notes Payable (Tables)	6 Months Ended
	Jun. 30, 2015
Debt Disclosure [Abstract]
Schedule of line of credit and notes payable indebtedness outstanding	As of June 30, 2015 and December 31, 2014 , Columbia Property Trust had the following line of credit, term loan, and notes payable indebtedness, including liabilities held for sale (excluding bonds payable; see Note 5, Bonds Payable ) in thousands: Facility June 30, December 31, $450 Million Term Loan $ 450,000 $ 450,000 Market Square Buildings mortgage note 325,000 325,000 JPMorgan Chase Credit Facility 316,000 — 650 California Street Building mortgage note 130,000 130,000 100 East Pratt Street Building mortgage note 105,000 105,000 221 Main Street Building mortgage note 73,000 73,000 263 Shuman Boulevard Building mortgage note 49,000 49,000 SanTan Corporate Center mortgage notes 39,000 39,000 One Glenlake Building mortgage note 30,696 32,074 215 Diehl Road Building mortgage note 21,000 21,000 333 Market Street Building mortgage note — 206,810 Total indebtedness $ 1,538,696 $ 1,430,884

Stockholder's Equity (Tables)

Stockholder's Equity (Tables)	6 Months Ended
	Jun. 30, 2015
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 six months ended June 30, 2015 and 2014 , follows: For the Six Months Ended Shares (in thousands) Weighted-Average Grant-Date Fair Value (1) Unvested shares - beginning of period 104 $ 24.82 Granted 123 $ 24.40 Vested (74 ) $ 24.60 Forfeited (2 ) $ 24.56 Unvested shares - end of period (2) 151 $ 24.59 (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 June 30, 2015 , we expect approximately 143,000 of the 151,000 unvested shares to ultimately vest, assuming a forfeiture rate of 5.0% , which was determined based on peer company data, adjusted for the specifics of the LTIP.
Summary of Shares Granted to Independent Directors	A summary of these grants, made under the LTIP, follows: Date of Grant Shares Grant-Date Fair Value 2015 Director Grants: January 2, 2015 5,850 $ 25.75 April 1, 2015 4,995 $ 27.16 July 1, 2015 4,144 $ 24.84 2014 Director Grants: January 21, 2014 3,344 $ 24.82 April 1, 2014 2,968 $ 27.22 July 1, 2014 3,016 $ 25.78
Schedule of stock-based compensation expense incurred	For the three and six months ended June 30, 2015 and 2014 , Columbia Property Trust incurred the stock-based compensation expense related to the following events (in thousands): Three Months Ended Six Months Ended 2015 2014 2015 2014 Amortization of unvested LTIP awards $ 364 $ 212 $ 927 $ 460 Future employee awards (1) 516 223 816 399 Issuance of shares to independent directors 135 81 286 164 Total stock-based compensation expense $ 1,015 $ 516 $ 2,029 $ 1,023 (1) These future employee awards relate to service during the period, to be granted in January of the subsequent year, with 25% vesting on the date of grant, and the remaining 75% vesting ratably on January 31st of each of the following three years.

Supplemental Disclosures of N26

Supplemental Disclosures of Noncash Investing and Financing Activities (Tables)	6 Months Ended
	Jun. 30, 2015
Supplemental Cash Flow Information [Abstract]
Schedule of Other Significant Noncash Transactions	Outlined below are significant noncash investing and financing activities for the six months ended June 30, 2015 and 2014 (in thousands): Six Months Ended 2015 2014 Investments in real estate funded with other assets $ 27,000 $ 3,807 Other assets assumed at acquisition $ 6,119 $ 501 Other liabilities assumed at acquisition $ 3,572 $ 589 Notes payable assumed at acquisition $ — $ 73,000 Discount on issuance of bonds payable $ 494 $ — Amortization of net (premiums) discounts on debt $ (169 ) $ 178 Market value adjustment to interest rate swaps that qualify for hedge accounting treatment $ 595 $ 211 Accrued capital expenditures and deferred lease costs $ 15,218 $ 18,431 Accrued deferred financing costs $ 19 $ 31 Common stock issued to employees and directors, and amortized (net of amounts withheld for income taxes) $ 1,300 $ 708

Held for Sale and Discontinue27

Held for Sale and Discontinued Operations (Tables)	6 Months Ended
	Jun. 30, 2015
Discontinued Operation, Additional Disclosures [Abstract]
Major classes of assets and liabilities classified as held for sale	The major classes of assets and liabilities classified as held for sale as of June 30, 2015 , are provided below (in thousands): June 30, 2015 Real estate assets held for sale: Real estate assets, at cost: Land $ 62,874 Buildings and improvements, less accumulated depreciation of $103,214 298,415 Intangible lease assets, less accumulated amortization of $36,606 10,951 Construction in progress 244 Total real estate assets held for sale, net $ 372,484 Other assets held for sale: Tenant receivables $ 1,196 Straight-line rent receivable 13,737 Prepaid expenses and other assets 715 Deferred financing costs, less accumulated amortization of $111 28 Intangible lease origination costs, less accumulated amortization of $38,722 13,100 Deferred lease costs, less accumulated amortization of $3,348 8,102 Total other assets held for sale, net $ 36,878 Liabilities held for sale: Mortgage note payable $ 21,000 Accounts payable, accrued expenses, and accrued capital expenditures 4,708 Deferred income 1,056 Intangible lease liabilities, less accumulated amortization of $3,662 1,475 Total liabilities held for sale, net $ 28,239
Schedule of revenues and expenses of the above-described discontinued operations	The activity reflected in 2014 relates to post-closing adjustments and true ups related to this 18 Property Sale. For the Three Months Ended June 30, 2014 For the Six Months Ended June 30, 2014 Revenues: Rental income $ 1 $ 4 Tenant reimbursements 151 100 152 104 Expenses: Property operating costs 82 (265 ) Asset and property management fees — 7 General and administrative 110 128 Total expenses 192 (130 ) Operating income (loss) (40 ) 234 Other income (expense): Interest and other income — 3 Income (loss) from discontinued operations (40 ) 237 Loss on disposition of discontinued operations (650 ) (978 ) Loss from discontinued operations $ (690 ) $ (741 )

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2015
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 income for the three and six months ended June 30, 2015 and 2014 , respectively (in thousands): Three Months Ended Six Months Ended 2015 2014 2015 2014 Net income $ 8,709 $ 8,021 $ 14,307 $ 11,421 Distributions paid on unvested shares (45 ) (32 ) (94 ) (64 ) Net income used to calculate basic and diluted earnings per share $ 8,664 $ 7,989 $ 14,213 $ 11,357 The following table reconciles the denominator for the basic and diluted earnings per-share computations shown on the consolidated statements of income for the three and six months ended June 30, 2015 and 2014 , respectively (in thousands): Three Months Ended Six Months Ended 2015 2014 2015 2014 Weighted-average common shares - basic 124,925 124,860 124,914 124,855 Plus incremental weighted-average shares from time-vested conversions, less assumed share repurchases: Previously granted LTIP awards, unvested 37 27 26 25 Future LTIP awards for 2015 55 32 41 21 Weighted-average common shares - diluted 125,017 124,919 124,981 124,901

Financial Information for Par29

Financial Information for Parent Guarantor, Other Guarantor Subsidiaries and Non-Guarantor Subsidiaries (Tables)	6 Months Ended
	Jun. 30, 2015
Financial Information for Parent Guarantor, Other Guarantor Subsidiaries and Non Guarantor Subsidiaries [Abstract]
Condensed Consolidating Balance Sheets	Condensed Consolidating Balance Sheets (in thousands) As of June 30, 2015 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating adjustments Columbia Property Trust Assets: Real estate assets, at cost: Land $ — $ 6,241 $ 842,801 $ — $ 849,042 Buildings and improvements, net — 29,887 3,041,448 — 3,071,335 Intangible lease assets, net — — 265,735 — 265,735 Construction in progress — 160 39,617 — 39,777 Real estate assets held for sale, net — — 372,484 — 372,484 Total real estate assets — 36,288 4,562,085 — 4,598,373 Cash and cash equivalents 673 11,908 21,161 — 33,742 Investment in subsidiaries 2,353,776 1,956,722 — (4,310,498 ) — Tenant receivables, net of allowance — 22 8,529 — 8,551 Straight-line rent receivable — 1,194 106,533 — 107,727 Prepaid expenses and other assets 320,186 147,131 23,547 (461,954 ) 28,910 Deferred financing costs, net — 7,773 2,038 — 9,811 Intangible lease origination costs, net — — 84,407 — 84,407 Deferred lease costs, net — 1,545 96,289 — 97,834 Investment in development authority bonds — — 120,000 — 120,000 Other assets held for sale, net — — 36,878 — 36,878 Total assets $ 2,674,635 $ 2,162,583 $ 5,061,467 $ (4,772,452 ) $ 5,126,233 Liabilities: Line of credit and notes payable $ — $ 766,000 $ 1,208,624 $ (456,928 ) $ 1,517,696 Bonds payable, net — 598,829 — — 598,829 Accounts payable, accrued expenses, and accrued capital expenditures 1 13,169 79,974 — 93,144 Due to affiliates — 33 4,651 (4,684 ) — Deferred income — 388 21,916 — 22,304 Intangible lease liabilities, net — — 71,387 — 71,387 Obligations under capital leases — — 120,000 — 120,000 Liabilities held for sale, net — — 28,581 (342 ) 28,239 Total liabilities 1 1,378,419 1,535,133 (461,954 ) 2,451,599 Equity: Total equity 2,674,634 784,164 3,526,334 (4,310,498 ) 2,674,634 Total liabilities and equity $ 2,674,635 $ 2,162,583 $ 5,061,467 $ (4,772,452 ) $ 5,126,233 Condensed Consolidating Balance Sheets (in thousands) As of December 31, 2014 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating adjustments Columbia Property Trust Assets: Real estate assets, at cost: Land $ — $ 6,241 $ 778,860 $ — $ 785,101 Building and improvements, net — 29,899 2,996,532 — 3,026,431 Intangible lease assets, net — — 247,068 — 247,068 Construction in progress — 433 17,529 — 17,962 Total real estate assets — 36,573 4,039,989 — 4,076,562 Cash and cash equivalents 119,488 10,504 19,798 — 149,790 Investment in subsidiaries 2,409,941 2,120,018 — (4,529,959 ) — Tenant receivables, net of allowance — 246 6,699 — 6,945 Straight-line rent receivable — 781 115,708 — 116,489 Prepaid expenses and other assets 204,079 148,226 19,734 (319,896 ) 52,143 Deferred financing costs, net — 6,020 2,406 — 8,426 Intangible lease origination costs, net — — 105,528 — 105,528 Deferred lease costs, net — 1,658 101,337 — 102,995 Investment in development authority bonds — — 120,000 — 120,000 Total assets $ 2,733,508 $ 2,324,026 $ 4,531,199 $ (4,849,855 ) $ 4,738,878 Liabilities: Lines of credit and notes payable $ — $ 450,000 $ 1,299,232 $ (318,348 ) $ 1,430,884 Bonds payable, net — 249,182 — — 249,182 Accounts payable, accrued expenses, and accrued capital expenditures 30 9,749 96,497 — 106,276 Due to affiliates — 24 1,524 (1,548 ) — Deferred income — 171 24,582 — 24,753 Intangible lease liabilities, net — — 74,305 — 74,305 Obligations under capital leases — — 120,000 — 120,000 Total liabilities 30 709,126 1,616,140 (319,896 ) 2,005,400 Equity: Total equity 2,733,478 1,614,900 2,915,059 (4,529,959 ) 2,733,478 Total liabilities and equity $ 2,733,508 $ 2,324,026 $ 4,531,199 $ (4,849,855 ) $ 4,738,878
Consolidating Statements of Operations	Consolidating Statements of Operations (in thousands) For the Three Months Ended June 30, 2015 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating adjustments Columbia Property Trust Revenues: Rental income $ — $ 622 $ 112,384 $ (90 ) $ 112,916 Tenant reimbursements — 286 26,233 — 26,519 Hotel income — — 6,964 — 6,964 Other property income — — 1,814 (89 ) 1,725 — 908 147,395 (179 ) 148,124 Expenses: Property operating costs — 720 47,453 (90 ) 48,083 Hotel operating costs — — 5,147 — 5,147 Asset and property management fees: Related-party — 26 — (26 ) — Other — — 503 — 503 Depreciation — 632 33,181 — 33,813 Amortization — 57 23,681 — 23,738 General and administrative 36 2,193 4,914 (63 ) 7,080 Acquisition expenses — 11 (11 ) — — 36 3,639 114,868 (179 ) 118,364 Real estate operating income (loss) (36 ) (2,731 ) 32,527 — 29,760 Other income (expense): Interest expense — (11,242 ) (19,296 ) 7,773 (22,765 ) Interest and other income 5,127 2,646 1,807 (7,773 ) 1,807 Loss on interest rate swaps — — (2 ) — (2 ) Income from equity investment 3,618 13,114 — (16,732 ) — 8,745 4,518 (17,491 ) (16,732 ) (20,960 ) Income before income tax expense 8,709 1,787 15,036 (16,732 ) 8,800 Income tax expense — (6 ) (85 ) — (91 ) Net income $ 8,709 $ 1,781 $ 14,951 $ (16,732 ) $ 8,709 Consolidating Statements of Operations (in thousands) For the Three Months Ended June 30, 2014 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating adjustments Columbia Property Trust Revenues: Rental income $ — $ 110 $ 103,802 $ (91 ) $ 103,821 Tenant reimbursements — 43 22,891 — 22,934 Hotel income — — 6,505 — 6,505 Other property income — — 3,555 (58 ) 3,497 — 153 136,753 (149 ) 136,757 Expenses: Property operating costs — 634 38,289 (91 ) 38,832 Hotel operating costs — — 4,689 — 4,689 Asset and property management fees: Related-party — 4 — (4 ) — Other — — 675 — 675 Depreciation — 405 29,764 — 30,169 Amortization — 13 20,208 — 20,221 Impairment loss on real estate assets — — 1,432 — 1,432 General and administrative 47 2,597 5,822 (54 ) 8,412 Acquisition expenses — — 6,102 — 6,102 47 3,653 106,981 (149 ) 110,532 Real estate operating income (loss) (47 ) (3,500 ) 29,772 — 26,225 Other income (expense): Interest expense — (7,779 ) (15,753 ) 4,672 (18,860 ) Interest and other income 1,988 2,686 1,800 (4,672 ) 1,802 Loss on interest rate swaps — — (105 ) — (105 ) Income from equity investment 6,080 12,848 — (18,928 ) — 8,068 7,755 (14,058 ) (18,928 ) (17,163 ) Income before income tax expense 8,021 4,255 15,714 (18,928 ) 9,062 Income tax expense — (1 ) (350 ) — (351 ) Income from continuing operations 8,021 4,254 15,364 (18,928 ) 8,711 Discontinued operations: Operating loss from discontinued operations — — (40 ) — (40 ) Loss on disposition of discontinued operations — — (650 ) — (650 ) Loss from discontinued operations — — (690 ) — (690 ) Net income $ 8,021 $ 4,254 $ 14,674 $ (18,928 ) $ 8,021 Consolidating Statements of Operations (in thousands) For the Six Months Ended June 30, 2015 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating adjustments Columbia Property Trust Revenues: Rental income $ — $ 1,218 $ 224,691 $ (184 ) $ 225,725 Tenant reimbursements — 514 54,254 — 54,768 Hotel income — — 11,957 — 11,957 Other property income — — 3,377 (160 ) 3,217 — 1,732 294,279 (344 ) 295,667 Expenses: Property operating costs — 1,509 96,512 (184 ) 97,837 Hotel operating costs — — 9,738 — 9,738 Asset and property management fees: Related-party — 40 — (40 ) — Other — — 900 — 900 Depreciation — 1,256 66,564 — 67,820 Amortization — 113 46,844 — 46,957 General and administrative 75 4,151 11,018 (120 ) 15,124 Acquisition expenses — 11 1,984 — 1,995 75 7,080 233,560 (344 ) 240,371 Real estate operating income (loss) (75 ) (5,348 ) 60,719 — 55,296 Other income (expense): Interest expense — (20,467 ) (36,196 ) 12,414 (44,249 ) Interest and other income 7,118 5,303 3,633 (12,414 ) 3,640 Loss on interest rate swaps — — (8 ) — (8 ) Loss on early extinguishment of debt — (477 ) — — (477 ) Income from equity investment 7,264 25,895 — (33,159 ) — 14,382 10,254 (32,571 ) (33,159 ) (41,094 ) Income before income tax benefit (expense) 14,307 4,906 28,148 (33,159 ) 14,202 Income tax benefit (expense) — (11 ) 116 — 105 Net income $ 14,307 $ 4,895 $ 28,264 $ (33,159 ) $ 14,307 Consolidating Statements of Operations (in thousands) For the Six Months Ended June 30, 2014 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating adjustments Columbia Property Trust Revenues: Rental income $ — $ 219 $ 204,349 $ (180 ) $ 204,388 Tenant reimbursements — 89 46,578 — 46,667 Hotel income — — 10,566 — 10,566 Other property income — — 4,399 (95 ) 4,304 — 308 265,892 (275 ) 265,925 Expenses: Property operating costs — 1,244 76,748 (180 ) 77,812 Hotel operating costs — — 8,830 — 8,830 Asset and property management fees: Related-party — 8 — (8 ) — Other — — 964 — 964 Depreciation — 786 56,687 — 57,473 Amortization — 22 38,720 — 38,742 Impairment loss on real estate assets — — 14,982 — 14,982 General and administrative 76 5,214 10,155 (87 ) 15,358 Acquisition expenses — — 6,102 — 6,102 76 7,274 213,188 (275 ) 220,263 Real estate operating income (loss) (76 ) (6,966 ) 52,704 — 45,662 Other income (expense): Interest expense — (15,213 ) (30,911 ) 9,354 (36,770 ) Interest and other income 3,976 5,381 3,609 (9,354 ) 3,612 Loss on interest rate swaps — — (335 ) — (335 ) Income from equity investment 7,521 21,454 — (28,975 ) — 11,497 11,622 (27,637 ) (28,975 ) (33,493 ) Income before income tax expense 11,421 4,656 25,067 (28,975 ) 12,169 Income tax expense — (2 ) (5 ) — (7 ) Income from continuing operations 11,421 4,654 25,062 (28,975 ) 12,162 Discontinued operations: Operating income from discontinued operations — — 237 — 237 Loss on disposition of discontinued operations — — (978 ) — (978 ) Loss from discontinued operations — — (741 ) — (741 ) Net income $ 11,421 $ 4,654 $ 24,321 $ (28,975 ) $ 11,421
Consolidating Statements of Comprehensive Income	Consolidating Statements of Comprehensive Income (in thousands) For the Three Months Ended June 30, 2015 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating adjustments Columbia Property Trust Net income $ 8,709 $ 1,781 $ 14,951 $ (16,732 ) $ 8,709 Market value adjustment to interest rate swap 436 436 — (436 ) 436 Comprehensive income $ 9,145 $ 2,217 $ 14,951 $ (17,168 ) $ 9,145 For the Three Months Ended June 30, 2014 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating adjustments Columbia Property Trust Net income $ 8,021 $ 4,254 $ 14,674 $ (18,928 ) $ 8,021 Market value adjustment to interest rate swap (43 ) (43 ) — 43 (43 ) Comprehensive income $ 7,978 $ 4,211 $ 14,674 $ (18,885 ) $ 7,978 For the Six Months Ended June 30, 2015 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating adjustments Columbia Property Trust Net income $ 14,307 $ 4,895 $ 28,264 $ (33,159 ) $ 14,307 Market value adjustment to interest rate swap 595 595 — (595 ) 595 Comprehensive income $ 14,902 $ 5,490 $ 28,264 $ (33,754 ) $ 14,902 For the Six Months Ended June 30, 2014 Columbia Property Trust (Guarantor) Columbia Property Trust OP Non- Guarantors Consolidating adjustments Columbia Property Trust Net income $ 11,421 $ 4,654 $ 24,321 $ (28,975 ) $ 11,421 Market value adjustment to interest rate swap 211 211 — (211 ) 211 Comprehensive income $ 11,632 $ 4,865 $ 24,321 $ (29,186 ) $ 11,632
Consolidating Statements of Cash Flows	Consolidating Statements of Cash Flows (in thousands) For the Six Months Ended June 30, 2015 Columbia Property Trust (Guarantor) Columbia Property Trust OP (the Issuer) Non- Guarantors Eliminations Columbia Property Trust Cash flows from operating activities $ (69 ) $ (22,854 ) $ 131,861 $ — $ 108,938 Cash flows from investing activities: Net proceeds from sale of real estate — — — — — Investment in real estate and related assets (57,198 ) (495,298 ) (50,326 ) — (602,822 ) Investments in subsidiaries (553,272 ) — — 553,272 — Net cash used in investing activities (610,470 ) (495,298 ) (50,326 ) 553,272 (602,822 ) Cash flows from financing activities: Borrowings, net of fees — 1,055,482 — — 1,055,482 Repayments of notes payable — (394,000 ) (207,878 ) — (601,878 ) Distributions (75,046 ) — — — (75,046 ) Shares redeemed to fund income tax withholdings on stock compensation (722 ) — — — (722 ) Intercompany contributions (distributions) 567,492 (141,926 ) 127,706 (553,272 ) — Net cash provided by (used in) financing activities 491,724 519,556 (80,172 ) (553,272 ) 377,836 Net decrease in cash and cash equivalents (118,815 ) 1,404 1,363 — (116,048 ) Cash and cash equivalents, beginning of period 119,488 10,504 19,798 — 149,790 Cash and cash equivalents, end of period $ 673 $ 11,908 $ 21,161 $ — $ 33,742 For the Six Months Ended June 30, 2014 Columbia Property Trust (Guarantor) Columbia Property Trust OP (the Issuer) Non- Guarantors Eliminations Columbia Property Trust Cash flows from operating activities $ (73 ) $ (19,585 ) $ 132,641 $ — $ 112,983 Cash flows from investing activities: Net proceeds from sale of real estate — 27,131 — — 27,131 Investment in real estate and related assets — (157,776 ) (30,782 ) — (188,558 ) Intercompany contributions (distributions) (133,515 ) — — 133,515 — Net cash used in investing activities (133,515 ) (130,645 ) (30,782 ) 133,515 (161,427 ) Cash flows from financing activities: Borrowings, net of fees — 129,807 (605 ) — 129,202 Repayments of line of credit and notes payable — (55,000 ) (1,300 ) — (56,300 ) Distributions (74,979 ) — — — (74,979 ) Intercompany transfers, net 179,565 59,837 (105,887 ) (133,515 ) — Net cash provided by (used in) financing activities 104,586 134,644 (107,792 ) (133,515 ) (2,077 ) Net increase (decrease) in cash and cash equivalents (29,002 ) (15,586 ) (5,933 ) — (50,521 ) Cash and cash equivalents, beginning of period 53,322 20,708 25,825 — 99,855 Cash and cash equivalents, end of period $ 24,320 $ 5,122 $ 19,892 $ — $ 49,334

Organization (Details)

Organization (Details) ft² in Millions	Jul. 01, 2015Properties	Jun. 30, 2015ft²StatesPropertiesBuildings
Real Estate
Number of operational buildings | Buildings		55
Square feet of real estate | ft²		16.6
Number of states with properties | States		12
Percent of leased office space of owned properties		92.10%
Office Building
Real Estate
Number of real estate properties		38
Hotel
Real Estate
Number of real estate properties		1
Disposed of by Sale | Eleven Property Sale | Subsequent Event
Real Estate
Number of real estate properties	11

Summary of Significant Accoun31

Summary of Significant Accounting Policies (Narratives) (Details) $ in Thousands	Jun. 04, 2014USD ($)	Jun. 30, 2015USD ($)Properties	Jun. 30, 2014USD ($)	Mar. 31, 2014USD ($)	Jun. 30, 2015USD ($)Properties	Jun. 30, 2014USD ($)	Dec. 31, 2014USD ($)
Significant Accounting Policies [Line Items]
Impairment loss on real estate assets		$ 0	$ 1,432		$ 0	$ 14,982
Amortization of intangible assets					42,005	37,542
Earnest money deposits included in prepaid expenses and other assets							$ 27,000
Fair value of interest rate swaps		$ (1,400)			$ (1,400)		(4,600)
Requirement to distribute taxable income (percent)		90.00%			90.00%
Limit on investments in taxable real estate investment trusts (percent)		25.00%			25.00%
Building
Significant Accounting Policies [Line Items]
Estimated useful life of real estate assets					40 years
Intangible below market lease assets
Significant Accounting Policies [Line Items]
Gross intangible assets		$ 140,900			$ 140,900		$ 110,700
Amortization of intangible assets		$ 600	500		$ 1,300	1,000
Minimum | Building Improvements
Significant Accounting Policies [Line Items]
Estimated useful life of real estate assets					5 years
Maximum | Building Improvements
Significant Accounting Policies [Line Items]
Estimated useful life of real estate assets					25 years
160 Park Avenue
Significant Accounting Policies [Line Items]
Net proceeds from the sale of real estate	$ 10,200
160 Park Avenue | Fair Value, Inputs, Level 2
Significant Accounting Policies [Line Items]
Impairment loss on real estate assets				$ 13,600
200 South Orange Building
Significant Accounting Policies [Line Items]
Net proceeds from the sale of real estate			18,400
Fair value of property			18,400			$ 18,400
200 South Orange Building | Fair Value, Inputs, Level 1
Significant Accounting Policies [Line Items]
Impairment loss on real estate assets			$ 1,400
Held-for-sale | Eleven Property Sale
Significant Accounting Policies [Line Items]
Number of real estate properties | Properties		11			11

Summary of Significant Accoun32

Summary of Significant Accounting Policies (Schedule of Intangible Assets & Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Gross Intangible In-Place Lease Assets and Liabilities [Abstract]
Intangible Lease Assets, Accumulated Amortization	$ (264,564)	$ (313,822)
Intangible lease assets, net	265,735	247,068
Intangible Lease Origination Costs, Accumulated Amortization	(179,438)	(219,626)
Intangible Lease Origination Costs, Net	84,407	105,528
Below Market Lease, Gross	156,131	159,240
Below Market Lease, Accumulated Amortization	(83,269)	(84,935)
Below Market Lease, Net	72,862	74,305
Above-Market In-Place Lease Assets
Gross Intangible In-Place Lease Assets and Liabilities [Abstract]
Intangible Lease Assets, Gross	69,903	79,805
Intangible Lease Assets, Accumulated Amortization	(53,664)	(61,619)
Intangible lease assets, net	16,239	18,186
Absorption Period Costs
Gross Intangible In-Place Lease Assets and Liabilities [Abstract]
Intangible Lease Assets, Gross	367,037	370,412
Intangible Lease Assets, Accumulated Amortization	(231,112)	(237,084)
Intangible lease assets, net	135,925	133,328
Intangible lease origination costs
Gross Intangible In-Place Lease Assets and Liabilities [Abstract]
Intangible Lease Origination Costs, Gross	315,667	325,154
Intangible Lease Origination Costs, Accumulated Amortization	(218,160)	(219,626)
Intangible Lease Origination Costs, Net	$ 97,507	$ 105,528

Summary of Significant Accoun33

Summary of Significant Accounting Policies (Schedule of Recognized Amortization) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 23,738	$ 20,221	$ 46,957	$ 38,742
Amortization of Below Market Lease	5,145	3,778	10,556	6,859
Above-Market In-Place Lease Assets
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	1,388	1,350	2,755	2,706
Absorption Period Costs
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	12,436	9,178	24,798	17,251
Intangible lease origination costs
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 8,121	$ 8,440	$ 16,278	$ 16,873

Summary of Significant Accoun34

Summary of Significant Accounting Policies (Schedule of Future Amortization by Intangible Asset Class) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets, Net [Abstract]
Intangible lease assets, net	$ 265,735	$ 247,068
Intangible Lease Origination Costs, Net	84,407	105,528
Below Market Lease [Abstract]
For the six months ending December 31, 2015	9,174
2,016	14,612
2,017	9,558
2,018	7,441
2,019	6,737
2,020	5,543
Thereafter	19,797
Below Market Lease, Net	72,862	74,305
Above-Market In-Place Lease Assets
Finite-Lived Intangible Assets, Net [Abstract]
For the six months ending December 31, 2015	2,186
2,016	4,039
2,017	1,920
2,018	1,081
2,019	1,035
2,020	996
Thereafter	4,982
Intangible lease assets, net	16,239	18,186
Absorption Period Costs
Finite-Lived Intangible Assets, Net [Abstract]
For the six months ending December 31, 2015	21,398
2,016	32,271
2,017	19,838
2,018	13,497
2,019	12,041
2,020	10,126
Thereafter	26,754
Intangible lease assets, net	135,925	133,328
Intangible lease origination costs
Finite-Lived Intangible Assets, Net [Abstract]
For the six months ending December 31, 2015	14,204
2,016	23,446
2,017	15,952
2,018	11,051
2,019	9,943
2,020	8,433
Thereafter	14,478
Intangible Lease Origination Costs, Net	$ 97,507	$ 105,528

Summary of Significant Accoun35

Summary of Significant Accounting Policies (Schedule of Future Amortization for Below-Market Lease Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
For the years ending December 31:
Intangible lease assets, net	$ 265,735	$ 247,068
Intangible below market lease assets
Finite-Lived Intangible Assets [Line Items]
For the six months ending December 31, 2015	1,274
For the years ending December 31:
2,016	2,549
2,017	2,549
2,018	2,549
2,019	2,549
2,020	2,549
Thereafter	110,502
Intangible lease assets, net	$ 124,521

Summary of Significant Accoun36

Summary of Significant Accounting Policies (Interest Rate Swaps) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
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	$ 436	$ (43)	$ 595	$ 211
Loss on interest rate swap recognized through earnings	(2)	$ (105)	(8)	$ (335)
Interest Rate Contract | Accounts Payable
Derivative, Fair Value, Net [Abstract]
Derivative designated as hedging instruments	(1,373)		(1,373)		$ (1,968)
Derivatives not designated as hedging instruments	$ 0		$ 0		$ (2,633)

Real Estate Transactions (Sched

Real Estate Transactions (Schedule of Properties Acquired) (Details) - USD ($) $ in Thousands	Jan. 08, 2015	Jan. 07, 2015	Apr. 22, 2014
315 Park Avenue South Building
Business Acquisition [Line Items]
Land		$ 119,633
Buildings and Improvements		232,598
Intangible below market lease liability		(7,487)
Total Purchase Price		365,804
1881 Campus Commons Building
Business Acquisition [Line Items]
Land		7,179
Buildings and Improvements		49,273
Intangible below market lease liability		(97)
Total Purchase Price		62,601
116 Huntington Avenue Building
Business Acquisition [Line Items]
Land	$ 0
Buildings and Improvements	108,383
Intangible below market lease liability	(1,878)
Total Purchase Price	147,325
221 Main Street Building
Business Acquisition [Line Items]
Land			$ 60,509
Buildings and Improvements			0
Intangible below market lease liability			(10,323)
Total Purchase Price			228,290
Intangible lease assets | 315 Park Avenue South Building
Business Acquisition [Line Items]
Intangible Lease Assets		16,912
Intangible lease assets | 1881 Campus Commons Building
Business Acquisition [Line Items]
Intangible Lease Assets		4,643
Intangible lease assets | 116 Huntington Avenue Building
Business Acquisition [Line Items]
Intangible Lease Assets	7,907
Intangible lease assets | 221 Main Street Building
Business Acquisition [Line Items]
Intangible Lease Assets			161,853
Intangible below market ground lease assets | 315 Park Avenue South Building
Business Acquisition [Line Items]
Intangible Lease Assets		0
Intangible below market ground lease assets | 1881 Campus Commons Building
Business Acquisition [Line Items]
Intangible Lease Assets		0
Intangible below market ground lease assets | 116 Huntington Avenue Building
Business Acquisition [Line Items]
Intangible Lease Assets	30,244
Intangible below market ground lease assets | 221 Main Street Building
Business Acquisition [Line Items]
Intangible Lease Assets			12,776
Intangible lease origination costs | 315 Park Avenue South Building
Business Acquisition [Line Items]
Intangible Lease Assets		4,148
Intangible lease origination costs | 1881 Campus Commons Building
Business Acquisition [Line Items]
Intangible Lease Assets		$ 1,603
Intangible lease origination costs | 116 Huntington Avenue Building
Business Acquisition [Line Items]
Intangible Lease Assets	$ 2,669
Intangible lease origination costs | 221 Main Street Building
Business Acquisition [Line Items]
Intangible Lease Assets			$ 3,475

Real Estate Transactions (Acqui

Real Estate Transactions (Acquisitions) (Details) ft² in Thousands	Jan. 08, 2015USD ($)ft²Tenant	Jan. 07, 2015USD ($)ft²PropertiesTenant	Apr. 22, 2014USD ($)ft²Tenant	Jun. 30, 2014USD ($)	Jun. 30, 2015USD ($)ft²Properties	Jun. 30, 2014USD ($)	Jun. 30, 2015USD ($)ft²Properties	Jun. 30, 2015USD ($)ft²Properties	Jun. 30, 2015USD ($)ft²Properties	Jun. 30, 2014USD ($)	Mar. 31, 2015USD ($)
Business Acquisition [Line Items]
Square feet of real estate | ft²					16,600		16,600	16,600	16,600
Real estate acquisitions								$ 551,277,000		$ 0
Percent of leased office space of owned properties					92.10%		92.10%	92.10%	92.10%
Acquisition expenses					$ 0	$ 6,102,000		$ 1,995,000		$ 6,102,000
315 Park Avenue South Building
Business Acquisition [Line Items]
Revenue recognized since acquisition date							$ 12,900,000
Net loss recognized since acquisition date							2,600,000
Acquisition expenses							1,200,000
1881 Campus Commons Building
Business Acquisition [Line Items]
Revenue recognized since acquisition date							3,000,000
Net loss recognized since acquisition date							1,100,000
Acquisition expenses							$ 500,000
116 Huntington Avenue Building
Business Acquisition [Line Items]
Revenue recognized since acquisition date									$ 5,600,000
Net loss recognized since acquisition date									400,000
Acquisition expenses									$ 300,000
221 Main Street Building
Business Acquisition [Line Items]
Revenue recognized since acquisition date				$ 3,400,000
Net loss recognized since acquisition date				7,500,000
Acquisition expenses				$ 6,100,000
Customer Concentration Risk | Credit Suisse | 315 Park Avenue South Building
Business Acquisition [Line Items]
Concentration risk percentage		74.00%
Customer Concentration Risk | SOS International | 1881 Campus Commons Building
Business Acquisition [Line Items]
Concentration risk percentage		15.00%
Customer Concentration Risk | Siemens | 1881 Campus Commons Building
Business Acquisition [Line Items]
Concentration risk percentage		12.00%
Customer Concentration Risk | American Tower | 116 Huntington Avenue Building
Business Acquisition [Line Items]
Concentration risk percentage	21.00%
Customer Concentration Risk | GE Healthcare | 116 Huntington Avenue Building
Business Acquisition [Line Items]
Concentration risk percentage	13.00%
Customer Concentration Risk | Brigham and Women's | 116 Huntington Avenue Building
Business Acquisition [Line Items]
Concentration risk percentage	12.00%
Customer Concentration Risk | DocuSign, Inc | 221 Main Street Building
Business Acquisition [Line Items]
Concentration risk percentage			15.70%
Office Building
Business Acquisition [Line Items]
Number of real estate properties | Properties					38		38	38	38
Office Building | 315 Park Avenue South Building
Business Acquisition [Line Items]
Square feet of real estate | ft²		327
Percent of leased office space of owned properties		94.90%
Number of customers | Tenant		9
Office Building | 1881 Campus Commons Building
Business Acquisition [Line Items]
Square feet of real estate | ft²		245
Percent of leased office space of owned properties		78.00%
Number of customers | Tenant		15
Office Building | 116 Huntington Avenue Building
Business Acquisition [Line Items]
Square feet of real estate | ft²	271
Real estate acquisitions	$ 152,000,000
Percent of leased office space of owned properties	78.00%
Number of customers | Tenant	17
Office Building | 315 Park Avenue South and 1881 Campus Commons Building
Business Acquisition [Line Items]
Number of real estate properties | Properties		2
Real estate acquisitions		$ 436,000,000
Office Building | 221 Main Street Building
Business Acquisition [Line Items]
Square feet of real estate | ft²			375
Real estate acquisitions			$ 228,800,000
Percent of leased office space of owned properties			82.80%
Number of customers | Tenant			40
Liabilities assumed from business acquisition			$ 73,000,000
Unsecured Debt | 2025 Bonds Payable
Business Acquisition [Line Items]
Debt face amount					$ 350,000,000		$ 350,000,000	$ 350,000,000	$ 350,000,000		$ 350,000,000
JPMorgan Chase Credit Facility
Business Acquisition [Line Items]
Proceeds from lines of credit			$ 116,000,000

Real Estate Transactions (Pro F

Real Estate Transactions (Pro Forma) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Real Estate [Abstract]
Revenues	$ 148,124	$ 147,348	$ 296,382	$ 289,145
Net income (loss)	$ 8,709	$ 11,595	$ 16,194	$ (4,561)
Net income (loss) per share - basic (in dollars per share)	$ 0.07	$ 0.09	$ 0.13	$ (0.04)
Net income (loss) per share - diluted (in dollars per share)	$ 0.07	$ 0.09	$ 0.13	$ (0.04)

Real Estate Transactions (Dispo

Real Estate Transactions (Dispositions) (Details) $ in Thousands	Jul. 01, 2015USD ($)Properties	Jun. 30, 2014USD ($)	Jun. 04, 2014USD ($)	Jun. 30, 2015USD ($)	Jun. 30, 2014USD ($)	Mar. 31, 2014USD ($)	Jun. 30, 2015USD ($)	Jun. 30, 2014USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment loss on real estate assets				$ 0	$ 1,432		$ 0	$ 14,982
Disposed of by Sale | 160 Park Avenue
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from the sale of real estate			$ 10,200
Impairment loss on real estate assets						$ 13,600
Disposed of by Sale | 200 South Orange Building
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from the sale of real estate		$ 18,800
Impairment loss on real estate assets		$ 1,400
Subsequent Event | Disposed of by Sale | Eleven Property Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties | Properties	11
Net proceeds from the sale of real estate	$ 433,300
Gain on sale of real estates	$ 20,000

Line of Credit, Term Loan, an41

Line of Credit, Term Loan, and Notes Payable (Schedule of Long-Term Debt (excluding Bonds Payable)) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Total indebtedness	$ 1,538,696	$ 1,430,884
Term Loans | $450 Million Term Loan
Debt Instrument [Line Items]
Total indebtedness	450,000	450,000
Mortgage Notes | Market Square Buildings mortgage note
Debt Instrument [Line Items]
Total indebtedness	325,000	325,000
Mortgage Notes | 650 California Street Building mortgage note
Debt Instrument [Line Items]
Total indebtedness	130,000	130,000
Mortgage Notes | 100 East Pratt Street Building mortgage note
Debt Instrument [Line Items]
Total indebtedness	105,000	105,000
Mortgage Notes | 221 Main Street Building mortgage note
Debt Instrument [Line Items]
Total indebtedness	73,000	73,000
Mortgage Notes | 263 Shuman Boulevard Building mortgage note
Debt Instrument [Line Items]
Total indebtedness	49,000	49,000
Mortgage Notes | SanTan Corporate Center mortgage notes
Debt Instrument [Line Items]
Total indebtedness	39,000	39,000
Mortgage Notes | One Glenlake Building mortgage note
Debt Instrument [Line Items]
Total indebtedness	30,696	32,074
Mortgage Notes | 215 Diehl Road Building mortgage note
Debt Instrument [Line Items]
Total indebtedness	21,000	21,000
Mortgage Notes | 333 Market Street Building mortgage note
Debt Instrument [Line Items]
Total indebtedness	0	206,810
Credit Facilities | JPMorgan Chase Credit Facility
Debt Instrument [Line Items]
Total indebtedness	$ 316,000	$ 0

Line of Credit, Term Loan, an42

Line of Credit, Term Loan, and Notes Payable (Details)

Jul. 30, 2015USD ($)Accordionloan

Jul. 13, 2015USD ($)

Jul. 01, 2015USD ($)

Jun. 01, 2015USD ($)

Mar. 12, 2015USD ($)

Jan. 06, 2015USD ($)

Jun. 30, 2015USD ($)

Jun. 30, 2014USD ($)

Jun. 30, 2015USD ($)

Jun. 30, 2014USD ($)

Dec. 31, 2011

Dec. 31, 2014USD ($)

Debt Instrument [Line Items]

Line of credit and notes payable

$ 1,517,696,000

$ 1,517,696,000

$ 1,430,884,000

Loss on early extinguishment of debt

0

$ 0

477,000

$ 0

$450 Million Term Loan Amended

Debt Instrument [Line Items]

Debt face amount

450,000,000

450,000,000

Unsecured Debt

Debt Instrument [Line Items]

Maturity of debt instrument

7 years

Unsecured Debt | JPMorgan Chase Term Loan

Debt Instrument [Line Items]

Debt face amount

$ 300,000,000

Maturity of debt instrument

6 months

Loss on early extinguishment of debt

$ 500,000

Term Loans | $450 Million Term Loan

Debt Instrument [Line Items]

Line of credit and notes payable

$ 450,000,000

$ 450,000,000

Effective fixed interest rate

2.07%

2.07%

Loans Payable

Debt Instrument [Line Items]

Estimated fair value of line of credit and notes payable

$ 1,568,800,000

$ 1,568,800,000

$ 1,465,200,000

Interest payments

30,700,000

27,200,000

Interest capitalized

$ 200,000

$ 0

Mortgage Notes | 333 Market Street Building mortgage note

Debt Instrument [Line Items]

Repayments of debt

$ 206,500,000

Subsequent Event | Unsecured Debt

Debt Instrument [Line Items]

Number of term loans | loan

2

Subsequent Event | Unsecured Debt | $300 Million Term Loan

Debt Instrument [Line Items]

Line of credit and notes payable

$ 300,000,000

Number of accordion options | Accordion

4

Maximum borrowing capacity

$ 400,000,000

Subsequent Event | Unsecured Debt | $150 Million Term Loan

Debt Instrument [Line Items]

Line of credit and notes payable

$ 150,000,000

Number of accordion options | Accordion

4

Maximum borrowing capacity

$ 300,000,000

Effective fixed interest rate

3.52%

Subsequent Event | Credit Facilities | Amended JPMorgan Chase Credit Facility

Debt Instrument [Line Items]

Number of accordion options | Accordion

4

Maximum borrowing capacity

$ 400,000,000

Subsequent Event | Mortgage Notes | 215 Diehl Road Building mortgage note

Debt Instrument [Line Items]

Repayments of debt

$ 21,000,000

Subsequent Event | Mortgage Notes | 100 East Pratt Street Building mortgage note

Debt Instrument [Line Items]

Repayments of debt

$ 105,000,000

Minimum | Credit Facilities | JPMorgan Chase Credit Facility

Debt Instrument [Line Items]

Commitment fee on revolving credit facility

0.15%

Minimum | Subsequent Event | Credit Facilities | Amended JPMorgan Chase Credit Facility

Debt Instrument [Line Items]

Commitment fee on revolving credit facility

0.125%

Maximum | Credit Facilities | JPMorgan Chase Credit Facility

Debt Instrument [Line Items]

Commitment fee on revolving credit facility

0.35%

Maximum | Subsequent Event | Credit Facilities | Amended JPMorgan Chase Credit Facility

Debt Instrument [Line Items]

Commitment fee on revolving credit facility

0.30%

LIBOR | Minimum | Credit Facilities | JPMorgan Chase Credit Facility

Debt Instrument [Line Items]

Margin spread on variable rate

1.00%

LIBOR | Minimum | Term Loans | $450 Million Term Loan

Debt Instrument [Line Items]

Margin spread on variable rate

1.15%

LIBOR | Minimum | Subsequent Event | Unsecured Debt | $300 Million Term Loan

Debt Instrument [Line Items]

Margin spread on variable rate

0.90%

LIBOR | Minimum | Subsequent Event | Unsecured Debt | $150 Million Term Loan

Debt Instrument [Line Items]

Margin spread on variable rate

1.40%

LIBOR | Minimum | Subsequent Event | Credit Facilities | Amended JPMorgan Chase Credit Facility

Debt Instrument [Line Items]

Margin spread on variable rate

0.875%

LIBOR | Maximum | Credit Facilities | JPMorgan Chase Credit Facility

Debt Instrument [Line Items]

Margin spread on variable rate

1.70%

LIBOR | Maximum | Term Loans | $450 Million Term Loan

Debt Instrument [Line Items]

Margin spread on variable rate

1.95%

LIBOR | Maximum | Subsequent Event | Unsecured Debt | $300 Million Term Loan

Debt Instrument [Line Items]

Margin spread on variable rate

1.75%

LIBOR | Maximum | Subsequent Event | Unsecured Debt | $150 Million Term Loan

Debt Instrument [Line Items]

Margin spread on variable rate

2.35%

LIBOR | Maximum | Subsequent Event | Credit Facilities | Amended JPMorgan Chase Credit Facility

Debt Instrument [Line Items]

Margin spread on variable rate

1.55%

Base Rate | Minimum | Credit Facilities | JPMorgan Chase Credit Facility

Debt Instrument [Line Items]

Margin spread on variable rate

0.00%

Base Rate | Minimum | Term Loans | $450 Million Term Loan

Debt Instrument [Line Items]

Margin spread on variable rate

0.15%

Base Rate | Minimum | Subsequent Event | Unsecured Debt | $300 Million Term Loan

Debt Instrument [Line Items]

Margin spread on variable rate

0.00%

Base Rate | Minimum | Subsequent Event | Unsecured Debt | $150 Million Term Loan

Debt Instrument [Line Items]

Margin spread on variable rate

0.40%

Base Rate | Minimum | Subsequent Event | Credit Facilities | Amended JPMorgan Chase Credit Facility

Debt Instrument [Line Items]

Margin spread on variable rate

0.00%

Base Rate | Maximum | Credit Facilities | JPMorgan Chase Credit Facility

Debt Instrument [Line Items]

Margin spread on variable rate

0.70%

Base Rate | Maximum | Term Loans | $450 Million Term Loan

Debt Instrument [Line Items]

Margin spread on variable rate

0.95%

Base Rate | Maximum | Subsequent Event | Unsecured Debt | $300 Million Term Loan

Debt Instrument [Line Items]

Margin spread on variable rate

0.75%

Base Rate | Maximum | Subsequent Event | Unsecured Debt | $150 Million Term Loan

Debt Instrument [Line Items]

Margin spread on variable rate

1.35%

Base Rate | Maximum | Subsequent Event | Credit Facilities | Amended JPMorgan Chase Credit Facility

Debt Instrument [Line Items]

Margin spread on variable rate

0.55%

Bonds Payable (Narratives) (Det

Bonds Payable (Narratives) (Details) - USD ($)	1 Months Ended	6 Months Ended		12 Months Ended
	Mar. 31, 2015	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2011	Dec. 31, 2014
Debt Instrument [Line Items]
Proceeds from issuance of bonds payable		$ 349,507,000	$ 0
Initial issuance discount of bonds payable		1,171,000			$ 818,000
Unsecured Debt
Debt Instrument [Line Items]
Maturity of debt instrument				7 years
Unsecured Debt | 2025 Bonds Payable
Debt Instrument [Line Items]
Face amount of issued debt instrument	$ 350,000,000	$ 350,000,000
Maturity of debt instrument	10 years
Interest rate for debt instrument (percent)	4.15%
Discount rate of face value of issued debt instrument (in percent)	99.859%
Proceeds from issuance of bonds payable	$ 347,200,000
Frequency of payments	semi-annual
Initial issuance discount of bonds payable	$ 500,000
Maturity date	Apr. 1, 2025
Unsecured Debt | 2018 Bonds Payable
Debt Instrument [Line Items]
Face amount of issued debt instrument				$ 250,000,000
Interest rate for debt instrument (percent)				5.875%
Discount rate of face value of issued debt instrument (in percent)				99.295%
Proceeds from issuance of bonds payable				$ 246,700,000
Frequency of payments				semi-annual
Initial issuance discount of bonds payable				$ 1,800,000
Maturity date		Apr. 1, 2018
Interest payments		$ 7,300,000	$ 7,300,000
Fair Value, Inputs, Level 2 | Unsecured Debt | 2025 and 2018 Bonds Payable
Debt Instrument [Line Items]
Estimated fair value of debt instrument		$ 602,500,000
Fair Value, Inputs, Level 2 | Unsecured Debt | 2018 Bonds Payable
Debt Instrument [Line Items]
Estimated fair value of debt instrument					$ 250,600,000

Stockholder's Equity (Details)

Stockholder's Equity (Details) - Relationship to Entity [Domain] - USD ($) $ in Millions	Jan. 21, 2015	Jun. 30, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock granted to employees		123,000
Unrecognized compensation costs related to unvested awards		$ 2.8	$ 1.7
2013 Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share authorized		2,000,000
2014 Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock granted to employees	123,187
Shares withheld to settle tax liability	11,368
Grant Date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights (in percent)		25.00%
Grant Date | 2014 Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights (in percent)	25.00%
January 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights (in percent)	25.00%
January 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights (in percent)	25.00%
January 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights (in percent)	25.00%
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)		3 years

Stockholder's Equity (Unvested

Stockholder's Equity (Unvested Activity Rollforward) (Details) - $ / shares shares in Thousands		6 Months Ended
		Jun. 30, 2015
Shares Rollforward
Unvested shares as of		104
Granted		123
Vested		(74)
Forfeited		(2)
Unvested shares as of	[1]	151
Weighted-Average, Grant-Date Fair Value Rollforward
Unvested shares as of	[2]	$ 24.82
Granted	[2]	24.40
Vested	[2]	24.60
Forfeited	[2]	24.56
Unvested shares as of	[2]	$ 24.59
Shares expected to ultimately vest		143
Expected forfeiture rate		5.00%
[1]	As of June 30, 2015, we expect approximately 143,000 of the 151,000 unvested shares to ultimately vest, assuming a forfeiture rate of 5.0%, which was determined based on peer company data, adjusted for the specifics of the LTIP.
[2]	Columbia Property Trust determined the weighted-average grant-date fair value using the market closing price on the date of the respective grants.

Stockholder's Equity (Summary o

Stockholder's Equity (Summary of Shares Granted to Independent Directors) (Details) - $ / shares		Jul. 01, 2015	Apr. 01, 2015	Jan. 02, 2015	Jul. 01, 2014	Apr. 01, 2014	Jan. 21, 2014	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock granted to employees								123,000
Weighted average grant date fair value of shares granted	[1]							$ 24.40
Director | January 02, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock granted to employees				5,850
Weighted average grant date fair value of shares granted				$ 25.75
Director | April 1, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock granted to employees			4,995
Weighted average grant date fair value of shares granted			$ 27.16
Director | January 21, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock granted to employees							3,344
Weighted average grant date fair value of shares granted							$ 24.82
Director | April 1, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock granted to employees						2,968
Weighted average grant date fair value of shares granted						$ 27.22
Director | July 1, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock granted to employees					3,016
Weighted average grant date fair value of shares granted					$ 25.78
Subsequent Event | Director | July 1, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock granted to employees		4,144
Weighted average grant date fair value of shares granted		$ 24.84
[1]	Columbia Property Trust determined the weighted-average grant-date fair value using the market closing price on the date of the respective grants.

Stockholder's Equity (Stock-bas

Stockholder's Equity (Stock-based Compensation Expenses) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense		$ 1,015	$ 516	$ 2,029	$ 1,023
Stock-based compensation expense related to future employee awards	[1]	516	223	816	399
Employees
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense		364	212	927	460
Director
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense		$ 135	$ 81	$ 286	$ 164
Grant Date
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Award vesting rights (in percent)				25.00%
Annually over Three Years
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Award vesting rights (in percent)				75.00%
[1]	These future employee awards relate to service during the period, to be granted in January of the subsequent year, with 25% vesting on the date of grant, and the remaining 75% vesting ratably on January 31st of each of the following three years.

Supplemental Disclosures of N48

Supplemental Disclosures of Noncash Investing and Financing Activities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Supplemental Cash Flow Information [Abstract]
Investments in real estate funded with other assets	$ 27,000	$ 3,807
Other assets assumed at acquisition	6,119	501
Other liabilities assumed at acquisition	3,572	589
Notes payable assumed at acquisition	0	73,000
Discount on issuance of bonds payable	494	0
Amortization of net (premiums) discounts on debt	(169)	178
Market value adjustment to interest rate swaps that qualify for hedge accounting treatment	595	211
Accrued capital expenditures and deferred lease costs	15,218	18,431
Accrued deferred financing costs	19	31
Common stock issued to employees and directors, and amortized (net of amounts withheld for income taxes)	$ 1,300	$ 708

Held for Sale and Discontinue49

Held for Sale and Discontinued Operations (Narratives) (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Nov. 30, 2013USD ($)	Jun. 30, 2015USD ($)Properties	Jun. 30, 2014USD ($)	Jun. 30, 2015USD ($)Properties	Jun. 30, 2014USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from the sale of real estate				$ 0	$ 27,131
Loss on disposition of discontinued operations		$ 0	$ (650)	$ 0	(978)
Held-for-sale | Eleven Property Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties | Properties		11		11
Disposed of by Sale | 18 Property Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from the sale of real estate	$ 521,500
Loss on disposition of discontinued operations	$ (400)		$ (650)		$ (978)

Held for Sale and Discontinue50

Held for Sale and Discontinued Operations (Balance Sheet Disclosures of Assets Held for Sale) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Real estate assets, at cost:
Total other assets held for sale, net	$ 36,878	$ 0
Liabilities held for sale:
Total liabilities held for sale, net	28,239	$ 0
Eleven Property Sale | Held-for-sale
Real estate assets, at cost:
Land	62,874
Buildings and improvements, less accumulated depreciation of $103,214	298,415
Intangible lease assets, less accumulated amortization of $36,606	10,951
Construction in progress	244
Total real estate assets held for sale, net	372,484
Tenant receivables	1,196
Straight-line rent receivable	13,737
Prepaid expenses and other assets	715
Deferred financing costs, less accumulated amortization of $111	28
Intangible lease origination costs, less accumulated amortization of $38,722	13,100
Deferred lease costs, less accumulated amortization of $3,348	8,102
Total other assets held for sale, net	36,878
Liabilities held for sale:
Mortgage note payable	21,000
Accounts payable, accrued expenses, and accrued capital expenditures	4,708
Deferred income	1,056
Intangible lease liabilities, less accumulated amortization of $3,662	1,475
Total liabilities held for sale, net	28,239
Parenthetical
Accumulated depreciation of buildings and improvements	103,214
Accumulated amortization of intangible lease assets	36,606
Deferred financing costs, accumulated amortization	111
Accumulated amortization of intangible lease origination costs	38,722
Accumulated amortization of deferred lease costs	3,348
Accumulated amortization of intangible lease liabilities	$ 3,662

Held for Sale and Discontinue51

Held for Sale and Discontinued Operations (Schedule of Revenue and Expenses from Discontinued Operations) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Nov. 30, 2013	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Other income (expense):
Income (loss) from discontinued operations		$ 0	$ (40)	$ 0	$ 237
Loss on disposition of discontinued operations		0	(650)	0	(978)
Loss from discontinued operations		$ 0	(690)	$ 0	(741)
18 Property Sale | Disposed of by Sale
Revenues:
Rental income			1		4
Tenant reimbursements			151		100
Revenues			152		104
Expenses:
Property operating costs			82		(265)
Asset and property management fees			0		7
General and administrative			110		128
Total expenses			192		(130)
Operating income (loss)			(40)		234
Other income (expense):
Interest and other income			0		3
Income (loss) from discontinued operations			(40)		237
Loss on disposition of discontinued operations	$ (400)		(650)		(978)
Loss from discontinued operations			$ (690)		$ (741)

Earnings Per Share (Basic and D

Earnings Per Share (Basic and Diluted EPS Computations) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 8,709	$ 8,021	$ 14,307	$ 11,421
Distributions paid on unvested shares	(45)	(32)	(94)	(64)
Net income used to calculate basic and diluted earnings per share	$ 8,664	$ 7,989	$ 14,213	$ 11,357
Weighted-average common shares - basic	124,925	124,860	124,914	124,855
Weighted-average common shares - diluted	125,017	124,919	124,981	124,901
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:	37	27	26	25
Future LTIP awards for 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Plus incremental weighted-average shares from time-vested conversions, less assumed share repurchases:	55	32	41	21

Financial Information for Par53

Financial Information for Parent Guarantor, Other Guarantor Subsidiaries and Non-Guarantor Subsidiaries (Narratives) (Details)	Jun. 30, 2015
Financial Information for Parent Guarantor, Other Guarantor Subsidiaries and Non Guarantor Subsidiaries [Abstract]
Ownership percentage of wholly owned subsidiary	100.00%

Financial Information for Par54

Financial Information for Parent Guarantor, Other Guarantor Subsidiaries and Non-Guarantor Subsidiaries (Condensed Consolidating Balance Sheets) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Assets:
Land	$ 849,042	$ 785,101
Buildings and improvements, net	3,071,335	3,026,431
Intangible lease assets, net	265,735	247,068
Construction in progress	39,777	17,962
Real estate assets held for sale, net	372,484	0
Total real estate assets	4,598,373	4,076,562
Cash and cash equivalents	33,742	149,790	$ 49,334	$ 99,855
Investment in subsidiaries	0	0
Tenant receivables, net of allowance	8,551	6,945
Straight-line rent receivable	107,727	116,489
Prepaid expenses and other assets	28,910	52,143
Deferred financing costs, net	9,811	8,426
Intangible lease origination costs, net	84,407	105,528
Deferred lease costs, net	97,834	102,995
Investment in development authority bonds	120,000	120,000
Other assets held for sale, net	36,878
Total assets	5,126,233	4,738,878
Liabilities:
Line of credit and notes payable	1,517,696	1,430,884
Bonds payable, net	598,829	249,182
Accounts payable, accrued expenses, and accrued capital expenditures	93,144	106,276
Due to affiliates	0	0
Deferred income	22,304	24,753
Intangible lease liabilities, net	71,387	74,305
Obligations under capital leases	120,000	120,000
Liabilities held for sale, net	28,239	0
Total liabilities	2,451,599	2,005,400
Equity:
Total equity	2,674,634	2,733,478	2,725,185	2,787,823
Total liabilities and equity	5,126,233	4,738,878
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
Cash and cash equivalents	673	119,488	24,320	53,322
Investment in subsidiaries	2,353,776	2,409,941
Tenant receivables, net of allowance	0	0
Straight-line rent receivable	0	0
Prepaid expenses and other assets	320,186	204,079
Deferred financing costs, net	0	0
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, net	0
Total assets	2,674,635	2,733,508
Liabilities:
Line of credit and notes payable	0	0
Bonds payable, net	0	0
Accounts payable, accrued expenses, and accrued capital expenditures	1	30
Due to affiliates	0	0
Deferred income	0	0
Intangible lease liabilities, net	0	0
Obligations under capital leases	0	0
Liabilities held for sale, net	0
Total liabilities	1	30
Equity:
Total equity	2,674,634	2,733,478
Total liabilities and equity	2,674,635	2,733,508
Reportable Legal Entities | Columbia Property Trust OP (the Issuer)
Assets:
Land	6,241	6,241
Buildings and improvements, net	29,887	29,899
Intangible lease assets, net	0	0
Construction in progress	160	433
Real estate assets held for sale, net	0
Total real estate assets	36,288	36,573
Cash and cash equivalents	11,908	10,504	5,122	20,708
Investment in subsidiaries	1,956,722	2,120,018
Tenant receivables, net of allowance	22	246
Straight-line rent receivable	1,194	781
Prepaid expenses and other assets	147,131	148,226
Deferred financing costs, net	7,773	6,020
Intangible lease origination costs, net	0	0
Deferred lease costs, net	1,545	1,658
Investment in development authority bonds	0	0
Other assets held for sale, net	0
Total assets	2,162,583	2,324,026
Liabilities:
Line of credit and notes payable	766,000	450,000
Bonds payable, net	598,829	249,182
Accounts payable, accrued expenses, and accrued capital expenditures	13,169	9,749
Due to affiliates	33	24
Deferred income	388	171
Intangible lease liabilities, net	0	0
Obligations under capital leases	0	0
Liabilities held for sale, net	0
Total liabilities	1,378,419	709,126
Equity:
Total equity	784,164	1,614,900
Total liabilities and equity	2,162,583	2,324,026
Reportable Legal Entities | Non- Guarantors
Assets:
Land	842,801	778,860
Buildings and improvements, net	3,041,448	2,996,532
Intangible lease assets, net	265,735	247,068
Construction in progress	39,617	17,529
Real estate assets held for sale, net	372,484
Total real estate assets	4,562,085	4,039,989
Cash and cash equivalents	21,161	19,798	19,892	25,825
Investment in subsidiaries	0	0
Tenant receivables, net of allowance	8,529	6,699
Straight-line rent receivable	106,533	115,708
Prepaid expenses and other assets	23,547	19,734
Deferred financing costs, net	2,038	2,406
Intangible lease origination costs, net	84,407	105,528
Deferred lease costs, net	96,289	101,337
Investment in development authority bonds	120,000	120,000
Other assets held for sale, net	36,878
Total assets	5,061,467	4,531,199
Liabilities:
Line of credit and notes payable	1,208,624	1,299,232
Bonds payable, net	0	0
Accounts payable, accrued expenses, and accrued capital expenditures	79,974	96,497
Due to affiliates	4,651	1,524
Deferred income	21,916	24,582
Intangible lease liabilities, net	71,387	74,305
Obligations under capital leases	120,000	120,000
Liabilities held for sale, net	28,581
Total liabilities	1,535,133	1,616,140
Equity:
Total equity	3,526,334	2,915,059
Total liabilities and equity	5,061,467	4,531,199
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
Cash and cash equivalents	0	0	$ 0	$ 0
Investment in subsidiaries	(4,310,498)	(4,529,959)
Tenant receivables, net of allowance	0	0
Straight-line rent receivable	0	0
Prepaid expenses and other assets	(461,954)	(319,896)
Deferred financing costs, net	0	0
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, net	0
Total assets	(4,772,452)	(4,849,855)
Liabilities:
Line of credit and notes payable	(456,928)	(318,348)
Bonds payable, net	0	0
Accounts payable, accrued expenses, and accrued capital expenditures	0	0
Due to affiliates	(4,684)	(1,548)
Deferred income	0	0
Intangible lease liabilities, net	0	0
Obligations under capital leases	0	0
Liabilities held for sale, net	(342)
Total liabilities	(461,954)	(319,896)
Equity:
Total equity	(4,310,498)	(4,529,959)
Total liabilities and equity	$ (4,772,452)	$ (4,849,855)

Financial Information for Par55

Financial Information for Parent Guarantor, Other Guarantor Subsidiaries and Non-Guarantor Subsidiaries (Consolidating Statements of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues:
Rental income	$ 112,916	$ 103,821	$ 225,725	$ 204,388
Tenant reimbursements	26,519	22,934	54,768	46,667
Hotel income	6,964	6,505	11,957	10,566
Other property income	1,725	3,497	3,217	4,304
Revenues	148,124	136,757	295,667	265,925
Expenses:
Property operating costs	48,083	38,832	97,837	77,812
Hotel operating costs	5,147	4,689	9,738	8,830
Asset and property management fees - Related-party	0	0	0	0
Asset and property management fees - Other	503	675	900	964
Depreciation	33,813	30,169	67,820	57,473
Amortization	23,738	20,221	46,957	38,742
Impairment loss on real estate assets	0	1,432	0	14,982
General and administrative	7,080	8,412	15,124	15,358
Acquisition expenses	0	6,102	1,995	6,102
Costs and expenses	118,364	110,532	240,371	220,263
Real estate operating income	29,760	26,225	55,296	45,662
Other income (expense):
Interest expense	(22,765)	(18,860)	(44,249)	(36,770)
Interest and other income	1,807	1,802	3,640	3,612
Loss on interest rate swaps	(2)	(105)	(8)	(335)
Loss on early extinguishment of debt	0	0	(477)	0
Income from equity investment	0	0	0	0
Nonoperating income (expense)	(20,960)	(17,163)	(41,094)	(33,493)
Income before income tax benefit (expense)	8,800	9,062	14,202	12,169
Income tax benefit (expense)	(91)	(351)	105	(7)
Income from continuing operations	8,709	8,711	14,307	12,162
Discontinued operations:
Operating income (loss) from discontinued operations	0	(40)	0	237
Loss on disposition of discontinued operations	0	(650)	0	(978)
Loss from discontinued operations	0	(690)	0	(741)
Net income	8,709	8,021	14,307	11,421
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	0
Other property income	0	0	0	0
Revenues	0	0	0	0
Expenses:
Property operating costs	0	0	0	0
Hotel operating costs	0	0	0	0
Asset and property management fees - Related-party	0	0	0	0
Asset and property management fees - Other	0	0	0	0
Depreciation	0	0	0	0
Amortization	0	0	0	0
Impairment loss on real estate assets		0		0
General and administrative	36	47	75	76
Acquisition expenses	0	0	0	0
Costs and expenses	36	47	75	76
Real estate operating income	(36)	(47)	(75)	(76)
Other income (expense):
Interest expense	0	0	0	0
Interest and other income	5,127	1,988	7,118	3,976
Loss on interest rate swaps	0	0	0	0
Loss on early extinguishment of debt			0
Income from equity investment	3,618	6,080	7,264	7,521
Nonoperating income (expense)	8,745	8,068	14,382	11,497
Income before income tax benefit (expense)	8,709	8,021	14,307	11,421
Income tax benefit (expense)	0	0	0	0
Income from continuing operations		8,021		11,421
Discontinued operations:
Operating income (loss) from discontinued operations		0		0
Loss on disposition of discontinued operations		0		0
Loss from discontinued operations		0		0
Net income	8,709	8,021	14,307	11,421
Reportable Legal Entities | Columbia Property Trust OP (the Issuer)
Revenues:
Rental income	622	110	1,218	219
Tenant reimbursements	286	43	514	89
Hotel income	0	0	0	0
Other property income	0	0	0	0
Revenues	908	153	1,732	308
Expenses:
Property operating costs	720	634	1,509	1,244
Hotel operating costs	0	0	0	0
Asset and property management fees - Related-party	26	4	40	8
Asset and property management fees - Other	0	0	0	0
Depreciation	632	405	1,256	786
Amortization	57	13	113	22
Impairment loss on real estate assets		0		0
General and administrative	2,193	2,597	4,151	5,214
Acquisition expenses	11	0	11	0
Costs and expenses	3,639	3,653	7,080	7,274
Real estate operating income	(2,731)	(3,500)	(5,348)	(6,966)
Other income (expense):
Interest expense	(11,242)	(7,779)	(20,467)	(15,213)
Interest and other income	2,646	2,686	5,303	5,381
Loss on interest rate swaps	0	0	0	0
Loss on early extinguishment of debt			(477)
Income from equity investment	13,114	12,848	25,895	21,454
Nonoperating income (expense)	4,518	7,755	10,254	11,622
Income before income tax benefit (expense)	1,787	4,255	4,906	4,656
Income tax benefit (expense)	(6)	(1)	(11)	(2)
Income from continuing operations		4,254		4,654
Discontinued operations:
Operating income (loss) from discontinued operations		0		0
Loss on disposition of discontinued operations		0		0
Loss from discontinued operations		0		0
Net income	1,781	4,254	4,895	4,654
Reportable Legal Entities | Non- Guarantors
Revenues:
Rental income	112,384	103,802	224,691	204,349
Tenant reimbursements	26,233	22,891	54,254	46,578
Hotel income	6,964	6,505	11,957	10,566
Other property income	1,814	3,555	3,377	4,399
Revenues	147,395	136,753	294,279	265,892
Expenses:
Property operating costs	47,453	38,289	96,512	76,748
Hotel operating costs	5,147	4,689	9,738	8,830
Asset and property management fees - Related-party	0	0	0	0
Asset and property management fees - Other	503	675	900	964
Depreciation	33,181	29,764	66,564	56,687
Amortization	23,681	20,208	46,844	38,720
Impairment loss on real estate assets		1,432		14,982
General and administrative	4,914	5,822	11,018	10,155
Acquisition expenses	(11)	6,102	1,984	6,102
Costs and expenses	114,868	106,981	233,560	213,188
Real estate operating income	32,527	29,772	60,719	52,704
Other income (expense):
Interest expense	(19,296)	(15,753)	(36,196)	(30,911)
Interest and other income	1,807	1,800	3,633	3,609
Loss on interest rate swaps	(2)	(105)	(8)	(335)
Loss on early extinguishment of debt			0
Income from equity investment	0	0	0	0
Nonoperating income (expense)	(17,491)	(14,058)	(32,571)	(27,637)
Income before income tax benefit (expense)	15,036	15,714	28,148	25,067
Income tax benefit (expense)	(85)	(350)	116	(5)
Income from continuing operations		15,364		25,062
Discontinued operations:
Operating income (loss) from discontinued operations		(40)		237
Loss on disposition of discontinued operations		(650)		(978)
Loss from discontinued operations		(690)		(741)
Net income	14,951	14,674	28,264	24,321
Consolidating adjustments
Revenues:
Rental income	(90)	(91)	(184)	(180)
Tenant reimbursements	0	0	0	0
Hotel income	0	0	0	0
Other property income	(89)	(58)	(160)	(95)
Revenues	(179)	(149)	(344)	(275)
Expenses:
Property operating costs	(90)	(91)	(184)	(180)
Hotel operating costs	0	0	0	0
Asset and property management fees - Related-party	(26)	(4)	(40)	(8)
Asset and property management fees - Other	0	0	0	0
Depreciation	0	0	0	0
Amortization	0	0	0	0
Impairment loss on real estate assets		0		0
General and administrative	(63)	(54)	(120)	(87)
Acquisition expenses	0	0	0	0
Costs and expenses	(179)	(149)	(344)	(275)
Real estate operating income	0	0	0	0
Other income (expense):
Interest expense	7,773	4,672	12,414	9,354
Interest and other income	(7,773)	(4,672)	(12,414)	(9,354)
Loss on interest rate swaps	0	0	0	0
Loss on early extinguishment of debt			0
Income from equity investment	(16,732)	(18,928)	(33,159)	(28,975)
Nonoperating income (expense)	(16,732)	(18,928)	(33,159)	(28,975)
Income before income tax benefit (expense)	(16,732)	(18,928)	(33,159)	(28,975)
Income tax benefit (expense)	0	0	0	0
Income from continuing operations		(18,928)		(28,975)
Discontinued operations:
Operating income (loss) from discontinued operations		0		0
Loss on disposition of discontinued operations		0		0
Loss from discontinued operations		0		0
Net income	$ (16,732)	$ (18,928)	$ (33,159)	$ (28,975)

Financial Information for Par56

Financial Information for Parent Guarantor, Other Guarantor Subsidiaries and Non-Guarantor Subsidiaries (Consolidating Statements of Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Condensed Financial Statements, Captions [Line Items]
Net income	$ 8,709	$ 8,021	$ 14,307	$ 11,421
Market value adjustment to interest rate swap	436	(43)	595	211
Comprehensive income (loss)	9,145	7,978	14,902	11,632
Reportable Legal Entities | Columbia Property Trust (Parent) (Guarantor)
Condensed Financial Statements, Captions [Line Items]
Net income	8,709	8,021	14,307	11,421
Market value adjustment to interest rate swap	436	(43)	595	211
Comprehensive income (loss)	9,145	7,978	14,902	11,632
Reportable Legal Entities | Columbia Property Trust OP (the Issuer)
Condensed Financial Statements, Captions [Line Items]
Net income	1,781	4,254	4,895	4,654
Market value adjustment to interest rate swap	436	(43)	595	211
Comprehensive income (loss)	2,217	4,211	5,490	4,865
Reportable Legal Entities | Non- Guarantors
Condensed Financial Statements, Captions [Line Items]
Net income	14,951	14,674	28,264	24,321
Market value adjustment to interest rate swap	0	0	0	0
Comprehensive income (loss)	14,951	14,674	28,264	24,321
Consolidating adjustments
Condensed Financial Statements, Captions [Line Items]
Net income	(16,732)	(18,928)	(33,159)	(28,975)
Market value adjustment to interest rate swap	(436)	43	(595)	(211)
Comprehensive income (loss)	$ (17,168)	$ (18,885)	$ (33,754)	$ (29,186)

Financial Information for Par57

Financial Information for Parent Guarantor, Other Guarantor Subsidiaries and Non-Guarantor Subsidiaries (Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	$ 108,938	$ 112,983
Cash flows from investing activities:
Net proceeds from sale of real estate	0	27,131
Investment in real estate and related assets	(602,822)	(188,558)
Intercompany contributions (distributions)		0
Investments in subsidiaries	0
Net cash used in investing activities	(602,822)	(161,427)
Cash flows from financing activities:
Borrowings, net of fees	1,055,482	129,202
Repayments of line of credit and notes payable	(601,878)	(56,300)
Distributions	(75,046)	(74,979)
Shares redeemed to fund income tax withholdings on stock compensation	(722)
Intercompany contributions (distributions)	0
Intercompany transfers, net		0
Net cash provided by (used in) financing activities	377,836	(2,077)
Net increase (decrease) in cash and cash equivalents	(116,048)	(50,521)
Cash and cash equivalents, beginning of period	149,790	99,855
Cash and cash equivalents, end of period	33,742	49,334
Reportable Legal Entities | Columbia Property Trust (Parent) (Guarantor)
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	(69)	(73)
Cash flows from investing activities:
Net proceeds from sale of real estate	0	0
Investment in real estate and related assets	(57,198)	0
Intercompany contributions (distributions)		(133,515)
Investments in subsidiaries	(553,272)
Net cash used in investing activities	(610,470)	(133,515)
Cash flows from financing activities:
Borrowings, net of fees	0	0
Repayments of line of credit and notes payable	0	0
Distributions	(75,046)	(74,979)
Shares redeemed to fund income tax withholdings on stock compensation	(722)
Intercompany contributions (distributions)	567,492
Intercompany transfers, net		179,565
Net cash provided by (used in) financing activities	491,724	104,586
Net increase (decrease) in cash and cash equivalents	(118,815)	(29,002)
Cash and cash equivalents, beginning of period	119,488	53,322
Cash and cash equivalents, end of period	673	24,320
Reportable Legal Entities | Columbia Property Trust OP (the Issuer)
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	(22,854)	(19,585)
Cash flows from investing activities:
Net proceeds from sale of real estate	0	27,131
Investment in real estate and related assets	(495,298)	(157,776)
Intercompany contributions (distributions)		0
Investments in subsidiaries	0
Net cash used in investing activities	(495,298)	(130,645)
Cash flows from financing activities:
Borrowings, net of fees	1,055,482	129,807
Repayments of line of credit and notes payable	(394,000)	(55,000)
Distributions	0	0
Shares redeemed to fund income tax withholdings on stock compensation	0
Intercompany contributions (distributions)	(141,926)
Intercompany transfers, net		59,837
Net cash provided by (used in) financing activities	519,556	134,644
Net increase (decrease) in cash and cash equivalents	1,404	(15,586)
Cash and cash equivalents, beginning of period	10,504	20,708
Cash and cash equivalents, end of period	11,908	5,122
Reportable Legal Entities | Non- Guarantors
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	131,861	132,641
Cash flows from investing activities:
Net proceeds from sale of real estate	0	0
Investment in real estate and related assets	(50,326)	(30,782)
Intercompany contributions (distributions)		0
Investments in subsidiaries	0
Net cash used in investing activities	(50,326)	(30,782)
Cash flows from financing activities:
Borrowings, net of fees	0	(605)
Repayments of line of credit and notes payable	(207,878)	(1,300)
Distributions	0	0
Shares redeemed to fund income tax withholdings on stock compensation	0
Intercompany contributions (distributions)	127,706
Intercompany transfers, net		(105,887)
Net cash provided by (used in) financing activities	(80,172)	(107,792)
Net increase (decrease) in cash and cash equivalents	1,363	(5,933)
Cash and cash equivalents, beginning of period	19,798	25,825
Cash and cash equivalents, end of period	21,161	19,892
Eliminations
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	0	0
Cash flows from investing activities:
Net proceeds from sale of real estate	0	0
Investment in real estate and related assets	0	0
Intercompany contributions (distributions)		133,515
Investments in subsidiaries	553,272
Net cash used in investing activities	553,272	133,515
Cash flows from financing activities:
Borrowings, net of fees	0	0
Repayments of line of credit and notes payable	0	0
Distributions	0	0
Shares redeemed to fund income tax withholdings on stock compensation	0
Intercompany contributions (distributions)	(553,272)
Intercompany transfers, net		(133,515)
Net cash provided by (used in) financing activities	(553,272)	(133,515)
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

Subsequent Events (Details)

Subsequent Events (Details) ft² in Thousands, $ in Thousands	Jul. 20, 2015USD ($)ft²	Jun. 30, 2015USD ($)ft²Properties	Jun. 30, 2014USD ($)	Dec. 31, 2011	Jul. 30, 2015loan	Jul. 01, 2015Properties
Subsequent Event [Line Items]
Square feet of real estate		16,600
Real estate acquisitions | $		$ 551,277	$ 0
Subsequent Event
Subsequent Event [Line Items]
Bridge loan | $	$ 300,000
Office Building
Subsequent Event [Line Items]
Number of real estate properties | Properties		38
Office Building | 229 West 43rd Street Building | Subsequent Event
Subsequent Event [Line Items]
Square feet of real estate	481
Real estate acquisitions | $	$ 516,000
Bridge Loan | Subsequent Event
Subsequent Event [Line Items]
Maturity of debt instrument	6 months
Disposed of by Sale | Eleven Property Sale | Subsequent Event
Subsequent Event [Line Items]
Number of real estate properties | Properties						11
Bonds Payable
Subsequent Event [Line Items]
Maturity of debt instrument				7 years
Bonds Payable | Subsequent Event
Subsequent Event [Line Items]
Number of term loans | loan					2
229 West 43rd Street Building | Subsequent Event
Subsequent Event [Line Items]
Square feet of real estate	732