Gramercy Property Trust 10-Q 2 Aug 17 2017 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 31, 2017
Document Information [Line Items]
Entity Registrant Name	Gramercy Property Trust
Entity Central Index Key	1,297,587
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Trading Symbol	gpt
Document Type	10-Q
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		151,916,981
GPT Operating Partnership LP [Member]
Document Information [Line Items]
Entity Registrant Name	GPT Operating Partnership LP
Entity Central Index Key	1,708,204
Entity Filer Category	Non-accelerated Filer

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Real estate investments, at cost:
Land	$ 796,476	$ 805,264
Building and improvements	4,118,785	4,053,125
Less: accumulated depreciation	(259,826)	(201,525)
Total real estate investments, net	4,655,435	4,656,864
Cash and cash equivalents	163,509	67,529
Restricted cash	40,326	12,904
Investment in unconsolidated equity investments	114,880	101,807
Assets held for sale, net	14,741	0
Tenant and other receivables, net	65,976	72,795
Acquired lease assets, net of accumulated amortization of $174,792 and $133,710	563,231	618,680
Other assets	68,808	72,948
Total assets	5,686,906	5,603,527
Liabilities:
Senior unsecured revolving credit facility	70,955	65,837
Exchangeable senior notes, net	110,154	108,832
Mortgage notes payable, net	495,404	558,642
Total long-term debt, net	2,398,097	2,454,775
Accounts payable and accrued expenses	39,738	58,380
Dividends payable	57,597	53,074
Below market lease liabilities, net of accumulated amortization of $26,091 and $26,416	175,635	230,183
Liabilities related to assets held for sale	7,960	0
Other liabilities	43,748	46,081
Total liabilities	2,722,775	2,842,493
Commitments and contingencies
Noncontrolling interest in the Operating Partnership	6,412	8,643
Equity:
Common shares, par value $0.01, 151,889,880 and 140,647,971 issued and outstanding at June 30, 2017 and December 31, 2016, respectively	1,519	1,406
Additional paid-in-capital	4,187,431	3,887,793
Accumulated other comprehensive loss	(1,655)	(4,128)
Accumulated deficit	(1,313,607)	(1,216,753)
Total shareholders' equity	2,958,082	2,752,712
Noncontrolling interest in other partnerships	(363)	(321)
Total equity	2,957,719	2,752,391
Partners’ Capital:
Accumulated other comprehensive loss	(1,655)	(4,128)
Total liabilities and equity	5,686,906	5,603,527
Series A Preferred Stock [Member]
Equity:
Series A cumulative redeemable preferred shares, par value $0.01, liquidation preference $87,500, and 3,500,000 shares authorized, issued and outstanding at June 30, 2017 and December 31, 2016	84,394	84,394
Senior unsecured notes, net [Member]
Liabilities:
Unsecured debt	496,584	496,464
Senior unsecured term loans [Member]
Liabilities:
Unsecured debt	1,225,000	1,225,000
GPT Operating Partnership LP [Member]
Real estate investments, at cost:
Land	796,476	805,264
Building and improvements	4,118,785	4,053,125
Less: accumulated depreciation	(259,826)	(201,525)
Total real estate investments, net	4,655,435	4,656,864
Cash and cash equivalents	163,509	67,529
Restricted cash	40,326	12,904
Investment in unconsolidated equity investments	114,880	101,807
Assets held for sale, net	14,741	0
Tenant and other receivables, net	65,976	72,795
Acquired lease assets, net of accumulated amortization of $174,792 and $133,710	563,231	618,680
Other assets	68,808	72,948
Total assets	5,686,906	5,603,527
Liabilities:
Senior unsecured revolving credit facility	70,955	65,837
Exchangeable senior notes, net	110,154	108,832
Mortgage notes payable, net	495,404	558,642
Total long-term debt, net	2,398,097	2,454,775
Accounts payable and accrued expenses	39,738	58,380
Dividends payable	57,597	53,074
Below market lease liabilities, net of accumulated amortization of $26,091 and $26,416	175,635	230,183
Liabilities related to assets held for sale	7,960	0
Other liabilities	43,748	46,081
Total liabilities	2,722,775	2,842,493
Noncontrolling interest in the Operating Partnership	6,412	8,643
Equity:
Accumulated other comprehensive loss	(1,655)	(4,128)
Partners’ Capital:
Series A cumulative redeemable preferred units, liquidation preference $87,500, and 3,500,000 units issued and outstanding at June 30, 2017 and December 31, 2016	84,394	84,394
GPT partners’ capital (1,520,626 and 1,412,916 general partner common units and 149,996,382 and 139,235,055 limited partner common units outstanding at June 30, 2017 and December 31, 2016, respectively)	2,875,343	2,672,446
Accumulated other comprehensive loss	(1,655)	(4,128)
Total GPTOP partners' capital	2,958,082	2,752,712
Noncontrolling interest in other partnerships	(363)	(321)
Total partners’ capital	2,957,719	2,752,391
Total liabilities and equity	5,686,906	5,603,527
GPT Operating Partnership LP [Member] | Senior unsecured notes, net [Member]
Liabilities:
Unsecured debt	496,584	496,464
GPT Operating Partnership LP [Member] | Senior unsecured term loans [Member]
Liabilities:
Unsecured debt	$ 1,225,000	$ 1,225,000

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Acquired lease assets, accumulated amortization (in dollars)	$ 174,792	$ 133,710
Below market lease liabilities, accumulated amortization (in dollars)	$ 26,091	$ 26,416
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares issued	151,889,880	140,647,971
Common stock, shares outstanding	151,889,880	140,647,971
Cumulative redeemable preferred stock, shares authorized	10,000,000	10,000,000
Cumulative redeemable preferred stock, shares outstanding	3,500,000
Series A Preferred Stock [Member]
Cumulative redeemable preferred stock, par value (in usd per share)	$ 0.01	$ 0.01
Cumulative redeemable preferred stock, liquidation preference (in dollars)	$ 87,500	$ 87,500
Cumulative redeemable preferred stock, shares authorized	3,500,000	3,500,000
Cumulative redeemable preferred stock, shares issued	3,500,000	3,500,000
Cumulative redeemable preferred stock, shares outstanding	3,500,000	3,500,000
GPT Operating Partnership LP [Member]
Acquired lease assets, accumulated amortization (in dollars)	$ 174,792	$ 133,710
Below market lease liabilities, accumulated amortization (in dollars)	26,091	26,416
Series A cumulative redeemable preferred units, liquidation preference (in dollars)	$ 87,500	$ 87,500
Series A cumulative redeemable preferred units, units issued	3,500,000	3,500,000
Series A cumulative redeemable preferred units, units outstanding	3,500,000	3,500,000
General partners' capital, units issued	1,520,626	1,412,916
Limited partners' capital, units issued	149,996,382	139,235,055
General partners' capital, units outstanding	1,520,626	1,412,916
Limited partners' capital, units outstanding	149,996,382	139,235,055
Noncontrolling Interest [Member] | GPT Operating Partnership LP [Member]
Limited partners' capital, units outstanding	545,589	643,596

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues
Rental revenue	$ 108,261	$ 98,517	$ 211,543	$ 190,612
Third-party management fees	1,638	18,310	6,230	23,356
Operating expense reimbursements	19,628	21,905	39,996	44,487
Other income	1,838	693	3,590	1,515
Total revenues	131,365	139,425	261,359	259,970
Operating Expenses
Property operating expenses	23,219	23,510	46,405	47,679
Property management expenses	2,435	5,591	5,519	10,112
Depreciation and amortization	62,176	60,538	124,393	118,786
General and administrative expenses	9,100	8,005	17,856	15,727
Acquisition expenses	0	4,312	0	4,722
Total operating expenses	96,930	101,956	194,173	197,026
Operating Income	34,435	37,469	67,186	62,944
Other Expenses:
Interest expense	(23,239)	(16,909)	(46,295)	(38,862)
Other-than-temporary impairment	0	0	(4,081)	0
Portion of impairment recognized in other comprehensive loss	0	0	(809)	0
Net impairment recognized in earnings	0	0	(4,890)	0
Equity in net income (loss) of unconsolidated equity investments	248	(168)	154	(2,923)
Gain on dissolution of previously held U.S. unconsolidated equity investment interests	0	7,229	0	7,229
Gain (loss) on extinguishment of debt	268	(1,356)	60	(7,113)
Impairment of real estate investments	(5,580)		(18,351)
Income (loss) from continuing operations before provision for taxes	6,132	26,265	(2,136)	21,275
Provision for taxes	(147)	(2,700)	49	(3,403)
Income (loss) from continuing operations	5,985	23,565	(2,087)	17,872
Income (loss) from discontinued operations before gain on extinguishment of debt	(28)	58	(52)	2,768
Gain on extinguishment of debt	0	0	0	1,930
Income (loss) from discontinued operations	(28)	58	(52)	4,698
Net income (loss) before net gain on disposals	5,957	23,623	(2,139)	22,570
Net gain on disposals	2,002	0	19,379	0
Gain on sale of European unconsolidated equity investment interests held with a related party	0	5,341	0	5,341
Net income	7,959	28,964	17,240	27,911
Net (income) loss attributable to noncontrolling interest	113	(51)	(41)	69
Net income attributable to Gramercy Property Trust	8,072	28,913	17,199	27,980
Preferred share dividends	(1,558)	(1,558)	(3,117)	(3,117)
Net income available to common shareholders	$ 6,514	$ 27,355	$ 14,082	$ 24,863
Basic earnings per share:
Net income from continuing operations, after preferred dividends (in usd per share)	$ 0.04	$ 0.19	$ 0.09	$ 0.14
Net income (loss) from discontinued operations (in usd per share)	0	0	0	0.03
Net income available to common stockholders (in usd per share)	0.04	0.19	0.09	0.17
Diluted earnings per share:
Net income from continuing operations, after preferred dividends (in usd per share)	0.04	0.19	0.09	0.14
Net income (loss) from discontinued operations (in usd per share)	0	0	0	0.03
Net income available to common stockholders (in usd per share)	$ 0.04	$ 0.19	$ 0.09	$ 0.17
Basic weighted average common shares outstanding (in shares)	148,542,916	140,776,976	144,746,251	140,664,885
Diluted weighted average common shares and common share equivalents outstanding (in shares)	149,914,443	142,514,202	145,965,936	142,088,590
GPT Operating Partnership LP [Member]
Revenues
Rental revenue	$ 108,261	$ 98,517	$ 211,543	$ 190,612
Third-party management fees	1,638	18,310	6,230	23,356
Operating expense reimbursements	19,628	21,905	39,996	44,487
Other income	1,838	693	3,590	1,515
Total revenues	131,365	139,425	261,359	259,970
Operating Expenses
Property operating expenses	23,219	23,510	46,405	47,679
Property management expenses	2,435	5,591	5,519	10,112
Depreciation and amortization	62,176	60,538	124,393	118,786
General and administrative expenses	9,100	8,005	17,856	15,727
Acquisition expenses	0	4,312	0	4,722
Total operating expenses	96,930	101,956	194,173	197,026
Operating Income	34,435	37,469	67,186	62,944
Other Expenses:
Interest expense	(23,239)	(16,909)	(46,295)	(38,862)
Other-than-temporary impairment	0	0	(4,081)	0
Portion of impairment recognized in other comprehensive loss	0	0	(809)	0
Net impairment recognized in earnings	0	0	(4,890)	0
Equity in net income (loss) of unconsolidated equity investments	248	(168)	154	(2,923)
Gain on dissolution of previously held U.S. unconsolidated equity investment interests	0	7,229	0	7,229
Gain (loss) on extinguishment of debt	268	(1,356)	60	(7,113)
Impairment of real estate investments	(5,580)	0	(18,351)	0
Income (loss) from continuing operations before provision for taxes	6,132	26,265	(2,136)	21,275
Provision for taxes	(147)	(2,700)	49	(3,403)
Income (loss) from continuing operations	5,985	23,565	(2,087)	17,872
Income (loss) from discontinued operations before gain on extinguishment of debt	(28)	58	(52)	2,768
Gain on extinguishment of debt	0	0	0	1,930
Income (loss) from discontinued operations	(28)	58	(52)	4,698
Net income (loss) before net gain on disposals	5,957	23,623	(2,139)	22,570
Net gain on disposals	2,002	0	19,379	0
Gain on sale of European unconsolidated equity investment interests held with a related party	0	5,341	0	5,341
Net income	7,959	28,964	17,240	27,911
Net Income (Loss) Attributable to Noncontrolling Interest in Other Partnerships	(137)	(27)	(17)	(139)
Net income attributable to Gramercy Property Trust	8,096	28,991	17,257	28,050
Preferred share dividends	(1,558)	(1,558)	(3,117)	(3,117)
Net income available to common unitholders	$ 6,538	$ 27,433	$ 14,140	$ 24,933
Basic earnings per unit:
Net income from continuing operations, after preferred unit distributions basic (in usd per unit)	$ 0.04	$ 0.19	$ 0.09	$ 0.14
Net income (loss) from discontinued operations, basic (in usd per unit)	0	0	0	0.03
Net income available to common unitholders, basic (in usd per unit)	0.04	0.19	0.09	0.17
Diluted earnings per unit:
Net income from continuing operations, after preferred unit distributions, diluted (in usd per unit)	0.04	0.19	0.09	0.14
Net income (loss) from discontinued operations, diluted (in usd per unit)	0	0	0	0.03
Net income available to common unitholders, diluted (in usd per unit)	$ 0.04	$ 0.19	$ 0.09	$ 0.17
Basic weighted average common units outstanding (in units)	149,103,359	141,179,745	145,336,798	141,095,320
Diluted weighted average common units outstanding (in units)	150,474,886	142,514,202	146,556,483	142,088,590

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net income	$ 7,959	$ 28,964	$ 17,240	$ 27,911
Other comprehensive income (loss):
Unrealized gain (loss) on available for sale debt securities	1,251	33	(1,569)	967
Unrealized gain (loss) on derivative instruments	(2,692)	(11,460)	1,686	(33,649)
Reclassification of accumulated foreign currency translation adjustments due to disposal	0	(3,737)	0	(3,737)
Foreign currency translation adjustments	1,101	(8,686)	1,792	(2,567)
Reclassification of unrealized loss on terminated derivative instruments into earnings	271	271	539	631
Other comprehensive income (loss)	(69)	(23,579)	2,448	(38,355)
Comprehensive income (loss)	7,890	5,385	19,688	(10,444)
Net (income) loss attributable to noncontrolling interest	113	(51)	(41)	69
Other comprehensive (income) loss attributable to noncontrolling interest	25	(67)	14	(115)
Comprehensive income (loss) attributable to Gramercy Property Trust	8,028	5,267	19,661	(10,490)
GPT Operating Partnership LP [Member]
Net income	7,959	28,964	17,240	27,911
Other comprehensive income (loss):
Unrealized gain (loss) on available for sale debt securities	1,251	33	(1,569)	967
Unrealized gain (loss) on derivative instruments	(2,692)	(11,460)	1,686	(33,649)
Reclassification of accumulated foreign currency translation adjustments due to disposal	0	(3,737)	0	(3,737)
Foreign currency translation adjustments	1,101	(8,686)	1,792	(2,567)
Reclassification of unrealized loss on terminated derivative instruments into earnings	271	271	539	631
Other comprehensive income (loss)	(69)	(23,579)	2,448	(38,355)
Comprehensive income (loss)	7,890	5,385	19,688	(10,444)
Net loss attributable to noncontrolling interest in other partnerships	137	27	17	139
Other comprehensive (income) loss attributable to noncontrolling interest	25	0	25	0
Comprehensive income (loss) attributable to Gramercy Property Trust	$ 8,052	$ 5,412	$ 19,730	$ (10,305)

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Shareholders' Equity (Deficit) and Noncontrolling Interests - 6 months ended Jun. 30, 2017 - USD ($) $ in Thousands	Total	Total Gramercy Property Trust [Member]	Common Shares [Member]	Preferred Shares [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings/(Accumulated Deficit) [Member]	Noncontrolling Interest [Member]
Balance (in shares) at Dec. 31, 2016	140,647,971		140,647,971
Balance at Dec. 31, 2016	$ 2,752,391	$ 2,752,712	$ 1,406	$ 84,394	$ 3,887,793	$ (4,128)	$ (1,216,753)	$ (321)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	17,182	17,199					17,199	(17)
Change in net unrealized loss on derivative instruments	1,686	1,686				1,686
Change in net unrealized gain on debt securities	(1,569)	(1,569)				(1,569)
Reclassification of unrealized gain on terminated derivative instruments into earnings	539	539				539
Offering costs	(12,346)	(12,346)			(12,346)
Issuance of shares (in shares)			11,081,453
Issuance of shares	305,660	305,660	$ 111		305,549
Share based compensation - fair value (in shares)			58,645
Share based compensation - fair value	$ 4,213	4,213	$ 1		4,212
Dividend reinvestment program proceeds (in shares)	3,802		3,802
Dividend reinvestment program proceeds	$ 103	103			103
Conversion of OP Units to commons shares (in shares)			98,009
Conversion of OP Units to common shares	2,697	2,697	$ 1		2,696
Reallocation of noncontrolling interest in the Operating Partnership	(576)	(576)			(576)
Foreign currency translation adjustment	1,792	1,817				1,817		(25)
Dividends on preferred shares	(3,117)	(3,117)					(3,117)
Dividends on common shares	$ (110,936)	(110,936)					(110,936)
Balance (in shares) at Jun. 30, 2017	151,889,880		151,889,880
Balance at Jun. 30, 2017	$ 2,957,719	$ 2,958,082	$ 1,519	$ 84,394	$ 4,187,431	$ (1,655)	$ (1,313,607)	$ (363)

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Partners' Capital - 6 months ended Jun. 30, 2017 - USD ($) $ in Thousands	Total	GPT Operating Partnership LP [Member]	GPT Operating Partnership LP [Member]Total GPTOP [Member]	GPT Operating Partnership LP [Member]Partners' Interest [Member]	GPT Operating Partnership LP [Member]Series A Preferred Units [Member]	GPT Operating Partnership LP [Member]Accumulated Other Comprehensive Income (Loss) [Member]	GPT Operating Partnership LP [Member]Noncontrolling Interest [Member]
Beginning balance at Dec. 31, 2016		$ 2,752,391	$ 2,752,712	$ 2,672,446	$ 84,394	$ (4,128)	$ (321)
Beginning balance (in units) at Dec. 31, 2016				140,647,971			545,589
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	$ 17,182	17,182	17,199	$ 17,199			$ (17)
Change in net unrealized loss on derivative instruments	1,686	1,686	1,686			1,686
Change in net unrealized gain on debt securities	(1,569)	(1,569)	(1,569)			(1,569)
Reclassification of unrealized loss on terminated derivative instruments into earnings	539	539	539			539
Offering costs		(12,346)	(12,346)	$ (12,346)
Issuance of common units resulting from public issuance of common shares (in units)				11,081,453
Issuance of common units resulting from public issuance of common shares		305,660	305,660	$ 305,660
Share based compensation - fair value (in units)				58,645
Share based compensation - fair value		4,213	4,213	$ 4,213
Distribution reinvestment program proceeds (in units)				3,802
Distribution reinvestment program proceeds		103	103	$ 103
Conversion of OP Units to common unit (in units)				98,009
Conversion of OP Units to common units		2,697	2,697	$ 2,697
Reallocation of noncontrolling interest in the Operating Partnership	(576)	(576)	(576)	(576)
Foreign currency translation adjustment	$ 1,792	1,792	1,817			1,817	(25)
Distributions on preferred units		(3,117)	(3,117)	(3,117)
Distributions on common units		(110,936)	(110,936)	(110,936)
Ending balance at Jun. 30, 2017		$ 2,957,719	$ 2,958,082	$ 2,875,343	$ 84,394	$ (1,655)	$ (363)
Ending balance (in units) at Jun. 30, 2017		151,517,008		151,889,880

Condensed Consolidated Stateme8

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating Activities:
Net income	$ 17,240	$ 27,911
Adjustments to net cash provided by operating activities:
Depreciation and amortization	124,393	118,786
Amortization of acquired leases to rental revenue and expense	(5,400)	(5,773)
Amortization of deferred costs	1,274	679
Amortization of discounts and other fees	33	(2,102)
Amortization of lease inducement costs	173	173
Straight-line rent adjustment	(14,718)	(12,716)
Other-than-temporary impairment on retained bonds	4,890	0
Impairment of real estate investments	18,351	0
Net gain on disposals	(19,379)	0
Distributions received from unconsolidated equity investments	689	13,775
Equity in net (income) loss of unconsolidated equity investments	(154)	2,923
Gain on remeasurement of previously held unconsolidated equity investment interests	0	(7,229)
Gain from sale of unconsolidated equity investment interests held with a related party	0	(5,341)
(Gain) loss on extinguishment of debt	(60)	5,183
Amortization of share-based compensation	4,058	2,422
Other non-cash adjustments	0	150
Changes in operating assets and liabilities:
Restricted cash	(19)	716
Payment of capitalized leasing costs	(6,008)	(9,558)
Tenant and other receivables	20,031	(11,842)
Other assets	(3,125)	(7,480)
Accounts payable and accrued expenses	(14,331)	(27,056)
Other liabilities	(1,895)	(9,319)
Net cash provided by operating activities	126,043	74,302
Investing Activities:
Capital expenditures	(46,119)	(9,474)
Distributions from investing activities received from unconsolidated equity investments	0	47,408
Proceeds from sales of unconsolidated equity investment interests held with a related party	0	149,286
Proceeds from sale of real estate	207,553	528,870
Return of restricted cash held in escrow for 1031 exchange	(27,691)	(42,908)
Contributions to unconsolidated equity investments	(7,400)	(32,566)
Acquisition of real estate	(284,689)	(304,267)
Restricted cash for tenant improvements	1,168	3,304
Proceeds from servicing advances receivable	0	1,390
Net cash (used in) provided by investing activities	(157,178)	341,043
Financing Activities:
Proceeds from unsecured term loan and credit facility	155,000	173,160
Proceeds from senior unsecured notes	0	50,000
Repayment of unsecured term loans and credit facility	(155,000)	(300,000)
Proceeds from mortgage notes payable	2,582	9,550
Repayment of mortgage notes payable	(58,014)	(215,179)
Offering costs	(12,346)	0
Proceeds from sale of common shares	305,763	0
Payment of deferred financing costs	(213)	(1,734)
Payment of debt extinguishment costs	0	(15,836)
Preferred share dividends paid	(3,117)	(3,117)
Common share dividends paid	(106,377)	(55,175)
Proceeds from exercise of share options and purchases under the employee share purchase plan	0	167
Distribution to noncontrolling interest in the Operating Partnership	(205)	(177)
Change in restricted cash from financing activities	(880)	(25)
Net cash provided by (used in) financing activities	127,193	(358,366)
Net increase in cash and cash equivalents	96,058	56,979
Increase (decrease) in cash and cash equivalents related to foreign currency translation	(78)	131
Cash and cash equivalents at beginning of period	67,529	128,031
Cash and cash equivalents at end of period	163,509	185,141
GPT Operating Partnership LP [Member]
Operating Activities:
Net income	17,240	27,911
Adjustments to net cash provided by operating activities:
Depreciation and amortization	124,393	118,786
Amortization of acquired leases to rental revenue and expense	(5,400)	(5,773)
Amortization of deferred costs	1,274	679
Amortization of discounts and other fees	33	(2,102)
Amortization of lease inducement costs	173	173
Straight-line rent adjustment	(14,718)	(12,716)
Other-than-temporary impairment on retained bonds	4,890	0
Impairment of real estate investments	18,351	0
Net gain on disposals	(19,379)	0
Distributions received from unconsolidated equity investments	689	13,775
Equity in net (income) loss of unconsolidated equity investments	(154)	2,923
Gain on remeasurement of previously held unconsolidated equity investment interests	0	(7,229)
Gain from sale of unconsolidated equity investment interests held with a related party	0	(5,341)
(Gain) loss on extinguishment of debt	(60)	5,183
Amortization of share-based compensation	4,058	2,422
Other non-cash adjustments	0	150
Changes in operating assets and liabilities:
Restricted cash	(19)	716
Payment of capitalized leasing costs	(6,008)	(9,558)
Tenant and other receivables	20,031	(11,842)
Other assets	(3,125)	(7,480)
Accounts payable and accrued expenses	(14,331)	(27,056)
Other liabilities	(1,895)	(9,319)
Net cash provided by operating activities	126,043	74,302
Investing Activities:
Capital expenditures	(46,119)	(9,474)
Distributions from investing activities received from unconsolidated equity investments	0	47,408
Proceeds from sales of unconsolidated equity investment interests held with a related party	0	149,286
Proceeds from sale of real estate	207,553	528,870
Return of restricted cash held in escrow for 1031 exchange	(27,691)	(42,908)
Contributions to unconsolidated equity investments	(7,400)	(32,566)
Acquisition of real estate	(284,689)	(304,267)
Restricted cash for tenant improvements	1,168	3,304
Proceeds from servicing advances receivable	0	1,390
Net cash (used in) provided by investing activities	(157,178)	341,043
Financing Activities:
Proceeds from unsecured term loan and credit facility	155,000	173,160
Proceeds from senior unsecured notes	0	50,000
Repayment of unsecured term loans and credit facility	(155,000)	(300,000)
Proceeds from mortgage notes payable	2,582	9,550
Repayment of mortgage notes payable	(58,014)	(215,179)
Offering costs	(12,346)	0
Proceeds from sale of common shares	305,763	0
Payment of deferred financing costs	(213)	(1,734)
Payment of debt extinguishment costs	0	(15,836)
Preferred share dividends paid	(3,117)	(3,117)
Common share dividends paid	(106,377)	(55,175)
Proceeds from exercise of share options and purchases under the employee share purchase plan	0	167
Distribution to noncontrolling interest in the Operating Partnership	(205)	(177)
Change in restricted cash from financing activities	(880)	(25)
Net cash provided by (used in) financing activities	127,193	(358,366)
Net increase in cash and cash equivalents	96,058	56,979
Increase (decrease) in cash and cash equivalents related to foreign currency translation	(78)	131
Cash and cash equivalents at beginning of period	67,529	128,031
Cash and cash equivalents at end of period	$ 163,509	$ 185,141

Business and Organization

Business and Organization	6 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business and Organization	Business and Organization Gramercy Property Trust, or the Company or Gramercy, a Maryland real estate investment trust, or REIT, together with its subsidiary, GPT Operating Partnership LP, or the Operating Partnership, is a leading global investor and asset manager of commercial real estate. Gramercy specializes in acquiring and managing high quality, income producing commercial real estate leased to high quality tenants in major markets in the United States and Europe. Gramercy earns revenues primarily through rental revenues on properties that it owns in the United States and asset management revenues on properties owned by third parties in the United States and Europe. The Company also owns unconsolidated equity investments in the United States, Europe, and Asia. The Company's operations are conducted primarily through the Operating Partnership. As of June 30, 2017 , third-party holders of limited partnership interests owned approximately 0.36% of the Operating Partnership. These interests are referred to as the noncontrolling interests in the Operating Partnership. As of June 30, 2017 , the Company’s wholly-owned portfolio consists of 320 properties comprising 67,485,724 rentable square feet with 97.7% occupancy. As of June 30, 2017 , the Company has ownership interests in 52 industrial and office properties which are held in unconsolidated equity investments in the United States and Europe and two properties held through the investment in CBRE Strategic Partners Asia. As of June 30, 2017 , the Company manages approximately $1,341,000 of commercial real estate assets, primarily on behalf of its joint venture partners, including approximately $1,048,000 of assets in Europe. During the six months ended June 30, 2017 , the Company acquired 19 properties aggregating 4,750,354 square feet for a total purchase price of approximately $302,412 , including the acquisition of a previously consolidated variable interest entity, or VIE, for $29,605 , a vacant property for $2,400 , and two land parcels for $6,840 . Additionally, during the six months ended June 30, 2017 , the Company acquired two land parcels for an aggregate purchase price of $2,800 , on which it has committed to construct industrial facilities for an estimated $49,077 . During the six months ended June 30, 2017 , the Company sold 17 properties and two offices from another asset aggregating 2,227,753 square feet for total gross proceeds of approximately $234,985 . Prior to December 17, 2015, the Company was known as Chambers Street Properties, or Chambers. On December 17, 2015, Chambers completed a merger, or the Merger, with Gramercy Property Trust Inc., or Legacy Gramercy. While Chambers was the surviving legal entity, immediately following consummation of the Merger, the Company changed its name to “Gramercy Property Trust” and its New York Stock Exchange, or NYSE, trading symbol to “GPT.” Unless the context requires otherwise, all references to “Company,” “Gramercy,” "we," "our" and "us" mean Legacy Gramercy and its subsidiaries, including Legacy Gramercy’s operating partnership and its subsidiaries, for the periods prior to the Merger closing and Gramercy Property Trust and its subsidiaries, including the Operating Partnership and its consolidated subsidiaries, for periods following the Merger closing.

Significant Accounting Policies

Significant Accounting Policies	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Significant Accounting Policies	Significant Accounting Policies Basis of Quarterly Presentation The accompanying Condensed Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States, or GAAP, for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In management’s opinion, all adjustments (consisting of normal recurring accruals) considered necessary for fair presentation have been included. The 2017 operating results for the period presented are not necessarily indicative of the results that may be expected for the year ending December 31, 2017. These Condensed Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and accompanying notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 and in the Operating Partnership’s audited financial statements for the year ended December 31, 2016 filed as an exhibit to the Company’s Form 8-K filed on June 29, 2017. The Condensed Consolidated Balance Sheets at December 31, 2016 were derived from the audited Consolidated Financial Statements at that date. Reclassifications Certain prior year balances have been reclassified to conform with the current year presentation. These reclassifications had no effect on the previously reported net income. On the Condensed Consolidated Statements of Operations, the Company reclassified investment income of $503 and $946 for the three and six months ended June 30, 2016, respectively, into other income. Principles of Consolidation The Condensed Consolidated Financial Statements include the Company’s accounts and those of the Company’s subsidiaries which are wholly-owned or controlled by the Company, or entities which are VIEs in which the Company is the primary beneficiary. The primary beneficiary is the party that absorbs a majority of the VIE’s anticipated losses and/or a majority of the expected returns. The Company has evaluated its investments for potential classification as variable interests by evaluating the sufficiency of each entity’s equity investment at risk to absorb losses. Entities which the Company does not control and are considered VIEs, but where the Company is not the primary beneficiary, are accounted for under the equity method. All significant intercompany balances and transactions have been eliminated. The equity interests of other limited partners in the Company’s Operating Partnership are reflected as noncontrolling interests. See Note 13 for more information on the Company’s noncontrolling interests. Real Estate Investments Real Estate Acquisitions In January 2017, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update, or ASU, 2017-01, Amendments to Business Combinations, which clarifies the framework for determining whether an integrated set of assets and activities meets the definition of a business. The revised framework narrows the definition of a business, which is expected to result in fewer transactions being accounted for as business combinations. Acquisitions of integrated sets of assets and activities that do not meet the definition of a business are accounted for as asset acquisitions. Although the Company is not required to implement ASU 2017-01 until annual periods beginning after December 15, 2017, including interim periods within those periods, the Company early adopted the new standard in the first quarter of 2017. As a result, the Company evaluated its real estate acquisitions during the six months ended June 30, 2017 under the new framework and determined the properties acquired did not meet the definition of a business, thus the transactions were accounted for as asset acquisitions. Refer to the "Recently Issued Accounting Pronouncements" section below for more information on the new guidance and refer to Note 4 for more information on the transactions during the six months ended June 30, 2017 . The Company evaluates its acquisitions of real estate, including equity interests in entities that predominantly hold real estate assets, to determine if the acquired assets meet the definition of a business and need to be accounted for as a business combination, or alternatively, should be accounted for as an asset acquisition. An integrated set of assets and activities acquired does not meet the definition of a business if either (i) substantially all the fair value of the gross assets acquired is concentrated in either a single identifiable asset or a group of similar identifiable assets, or (ii) the asset and activities acquired do not contain at least an input and a substantive process that together significantly contribute to the ability to create outputs. The Company expects that its acquisitions of real estate will continue to not meet the revised definition of a business. Acquisitions of real estate that do not meet the definition of a business, including sale-leaseback transactions that have newly-originated leases and real estate investments under construction, or build-to-suit investments, are recorded as asset acquisitions. The accounting for asset acquisitions is similar to the accounting for business combinations, except that the acquisition consideration, including acquisition costs, is allocated to the individual assets acquired and liabilities assumed on a relative fair value basis. Based on this allocation methodology, asset acquisitions do not result in the recognition of goodwill or a bargain purchase. The Company incurs internal transaction costs, which are direct, incremental internal costs related to acquisitions, that are recorded within general and administrative expense. Additionally, for build-to-suit investments in which the Company may engage a developer to construct a property or provide funds to a tenant to develop a property, the Company capitalizes the funds provided to the developer/tenant and real estate taxes, if applicable, during the construction period. To determine the fair value of assets acquired and liabilities assumed in an acquisition, which generally include land, building, improvements, and intangibles, such as the value of above- and below-market leases and origination costs associated with the in-place leases at the acquisition date, the Company utilizes various estimates, processes and information to determine the as-if-vacant property value. Estimates of value are made using customary methods, including data from appraisals, comparable sales, and discounted cash flow analyses. Estimates of future cash flows are based on a number of factors including the historical operating results, known trends, and market/economic conditions that may affect the property. The Company assesses the fair value of leases assumed at acquisition based upon estimated cash flow projections that utilize appropriate discount rates and available market information. Refer to the policy section "Intangible Assets and Liabilities" for more information on the Company’s accounting for intangibles. Depreciation is computed using the straight-line method over the shorter of the estimated useful life at acquisition of the capitalized item or 40 years for buildings, five to ten years for building equipment and fixtures, and the lesser of the useful life or the remaining lease term for tenant improvements and leasehold interests. Maintenance and repair expenditures are charged to expense as incurred. For transactions that qualify as business combinations, the Company recognizes the assets acquired and liabilities assumed at fair value, including the value of intangible assets and liabilities, and any excess or deficit of the consideration transferred relative to the fair value of the net assets acquired is recorded as goodwill or a bargain purchase gain, as appropriate. Acquisition costs of business combinations are expensed as incurred. Capital Improvements In leasing space, the Company may provide funding to the lessee through a tenant allowance. Certain improvements are capitalized when they are determined to increase the useful life of the building. During construction of qualifying projects, the Company capitalizes project management fees as permitted to be charged under the lease, if incremental and identifiable. In accounting for tenant allowances, the Company determines whether the allowance represents funding for the construction of leasehold improvements and evaluates the ownership of such improvements. If the Company is considered the owner of the leasehold improvements, the Company capitalizes the amount of the tenant allowance and depreciates it over the shorter of the useful life of the leasehold improvements or the lease term. If the tenant allowance represents a payment for a purpose other than funding leasehold improvements, or in the event the Company is not considered the owner of the improvements for accounting purposes, the allowance is considered to be a lease incentive and is recognized over the lease term as a reduction of rental revenue. Factors considered during this evaluation usually include (i) who holds legal title to the improvements, (ii) evidentiary requirements concerning the spending of the tenant allowance, and (iii) other controlling rights provided by the lease agreement (e.g. unilateral control of the tenant space during the build-out process). Determination of the accounting for a tenant allowance is made on a case-by-case basis, considering the facts and circumstances of the individual tenant lease. Impairments The Company reviews the recoverability of a property’s carrying value when circumstances indicate a possible impairment of the value of a property, such as an adverse change in future expected occupancy or a significant decrease in the market price of an asset. The review of recoverability is based on an estimate of the future undiscounted cash flows, excluding interest charges, expected to result from the property’s use and eventual disposition. These estimates consider factors such as changes in strategy resulting in an increased or decreased holding period, expected future operating income, market and other applicable trends and residual value, as well as the effects of leasing demand, competition and other factors. If management determines impairment exists due to the inability to recover the carrying value of a property, for properties to be held and used, an impairment loss is recorded to the extent that the carrying value exceeds the estimated fair value of the property and for assets held for sale, an impairment loss is recorded to the extent that the carrying value exceeds the fair value less estimated cost of disposal. These assessments are recorded as an impairment loss in the Condensed Consolidated Statements of Operations in the period the determination is made. The estimated fair value of the asset becomes its new cost basis. For a depreciable long-lived asset to be held and used, the new cost basis will be depreciated or amortized over the remaining useful life of that asset. Cash and Cash Equivalents The Company considers all highly liquid investments with maturities of three months or less when purchased to be cash equivalents. Restricted Cash The Company had restricted cash of $40,326 and $12,904 at June 30, 2017 and December 31, 2016 , respectively, which primarily consisted of proceeds from property sales held by qualified intermediaries to be used for tax-deferred, like-kind exchanges under Internal Revenue Code, or IRC, Section 1031, reserves for certain capital improvements, leasing, interest and real estate tax and insurance payments as required by certain mortgage note obligations. Variable Interest Entities The Company had two and three consolidated VIEs as of June 30, 2017 and December 31, 2016 , respectively. The Company had three and four unconsolidated VIEs as of June 30, 2017 and December 31, 2016 , respectively. The following is a summary of the Company’s involvement with VIEs as of June 30, 2017 : Company carrying value-assets Company carrying value-liabilities Face value of assets held by the VIEs Face value of liabilities issued by the VIEs Consolidated VIEs: Operating Partnership $ 5,686,906 $ 2,722,775 $ 5,686,906 $ 2,722,775 Gramercy Europe Asset Management (European Fund Manager) $ 1,348 $ 25 $ 1,348 $ 2,073 Unconsolidated VIEs: Gramercy Europe Asset Management (European Fund Carry Co.) $ 5 $ — $ 18 $ — Retained CDO Bonds $ 6,345 $ — $ 135,640 $ 113,252 The following is a summary of the Company’s involvement with VIEs as of December 31, 2016 : Company carrying value-assets Company carrying value-liabilities Face value of assets held by the VIEs Face value of liabilities issued by the VIEs Consolidated VIEs: Operating Partnership $ 5,603,527 $ 2,842,493 $ 5,603,527 $ 2,842,493 Proportion Foods $ 22,836 $ 3,041 $ 22,836 $ 23,514 Gramercy Europe Asset Management (European Fund Manager) $ 1,100 $ 47 $ 1,100 $ 1,742 Unconsolidated VIEs: Gramercy Europe Asset Management (European Fund Carry Co.) $ 8 $ — $ 31 $ — Retained CDO Bonds $ 11,906 $ — $ 391,990 $ 592,414 Consolidated VIEs Operating Partnership The Operating Partnership is a consolidated VIE because the Company is its primary beneficiary due to its majority ownership and ability to exercise control over every aspect of the Operating Partnership’s operations. Gramercy Europe Asset Management (European Fund Manager) In connection with the Company’s December 2014 investment in the Gramercy European Property Fund, the Company acquired equity interests in the entity, hereinafter European Fund Manager, which provides investment and asset management services to the Gramercy European Property Fund. The Company determined that European Fund Manager is a VIE, as the equity holders of that entity do not have controlling financial interests and do not have the obligation to absorb losses. As Gramercy Europe Asset Management, through an investment advisory agreement with the VIE, controls the activities that most significantly affect the economic outcome of European Fund Manager, the Company concluded that it is the entity’s primary beneficiary and has consolidated the VIE. The Company receives net cash inflows from European Fund Manager in the form of management fees, and if the VIE’s cash inflows are not sufficient to cover its obligations, the Company may provide financial support for the VIE. Proportion Foods In December 2015, the Company entered into a non-recourse financing arrangement with Big Proportion Austin LLC, or BIG, for a build-to-suit industrial property in Round Rock, Texas, or Proportion Foods. Concurrently, the Company entered into a forward purchase agreement with BIG, pursuant to which the Company agreed to acquire the property, which is 100.0% leased to Proportion Foods, upon substantial completion of the facility’s development. The Company determined that Proportion Foods was a VIE, as the equity holders of the entity did not have controlling financial interests and were not obligated to absorb losses. The Company controlled the activities that most significantly affected the economic outcome of Proportion Foods through its financing arrangement to fund the property’s development and its forward purchase agreement with BIG. As such, the Company concluded it was the entity’s primary beneficiary and consolidated the VIE. The construction of the facility on the property was completed in March 2017, at which time the Company acquired the property. Following the acquisition, the property was wholly-owned by the Company and was no longer a consolidated VIE. Unconsolidated VIEs Gramercy Europe Asset Management (European Fund Carry Co.) In connection with the Company’s December 2014 investment in the Gramercy European Property Fund, the Company acquired equity interests in the entity, hereinafter European Fund Carry Co., entitled to receive certain preferential distributions, if any, made from time-to-time by the Gramercy European Property Fund. The Company determined that European Fund Carry Co. is a VIE, as the equity holders of that entity do not have controlling financial interests and do not have the obligation to absorb losses in excess of capital committed. Decisions that most significantly affect the economic performance of European Fund Carry Co. are decided by a majority vote of that VIE’s shareholders. As such, the Company does not have a controlling financial interest in the VIE and accounts for it as an equity investment. Investment in Retained CDO Bonds The Company has retained non-investment grade subordinate bonds, preferred shares and ordinary shares of three collateralized debt obligations, or CDOs, together the Retained CDO Bonds. The Company does not control the activities that most significantly impact the Retained CDO Bonds’ economic performance and is not obligated to provide any financial support to them, thus the Retained CDO Bonds have been determined to be unconsolidated VIEs, in which the Company’s interest is recorded at fair value within other assets on the Condensed Consolidated Balance Sheets. The Retained CDO Bonds may provide the potential for the Company to receive continuing cash flows in the future, however, there is no guarantee that the Company will realize any proceeds from the Retained CDO Bonds or what the timing of the proceeds may be. The Company’s maximum exposure to loss is limited to its interest in the Retained CDO Bonds. In April 2017, one of the CDOs, in which the Company’s retained interest has no value, commenced liquidation. The Company will not receive any proceeds from the liquidation. Thus, as of June 30, 2017, one of the Retained CDO Bonds is no longer considered a VIE of the Company. Tenant and Other Receivables Tenant and other receivables are derived from rental revenue, tenant reimbursements, and management fees. Rental revenue is recorded on a straight-line basis over the initial term of the lease. Since many leases provide for rental increases at specified intervals, straight-line basis accounting requires the Company to record a receivable, and include in revenues, unbilled rent receivables that will only be received if the tenant makes all rent payments required through the expiration of the initial term of the lease. Tenant and other receivables also include receivables related to tenant reimbursements for common area maintenance expenses and certain other recoverable expenses that are recognized as revenue in the period in which the related expenses are incurred. Tenant and other receivables are recorded net of the allowances for doubtful accounts, which as of June 30, 2017 and December 31, 2016 were $523 and $57 , respectively. The Company continually reviews receivables related to rent, tenant reimbursements, and management fees, including incentive fees, and determines collectability by taking into consideration the tenant or asset management clients’ payment history, the financial condition of the tenant or asset management client, business conditions in the industry in which the tenant or asset management client operates and economic conditions in the area in which the property or asset management client is located. In the event that the collectability of a receivable is in doubt, the Company increases the allowance for doubtful accounts or records a direct write-off of the receivable, as appropriate. Management fees, including incentive management fees, are recognized as earned in accordance with the terms of the management agreements. The management agreements may contain provisions for fees related to dispositions, administration of the assets including fees related to accounting, valuation and legal services, and management of capital improvements or projects on the underlying assets. Intangible Assets and Liabilities As discussed above in the policy section “Real Estate Acquisitions” the Company follows the acquisition method of accounting for its asset acquisitions and business combinations and thus allocates the purchase price of acquired properties to tangible and identifiable intangible assets acquired based on their respective fair values. Identifiable intangible assets include amounts allocated to acquired leases for above- and below- market lease rates and the value of in-place leases. Management also considers information obtained about each property as a result of its pre-acquisition due diligence. Above-market and below-market lease values for properties acquired are recorded based on the present value of the difference between the contractual amount to be paid pursuant to each in-place lease and management’s estimate of the fair market lease rate for each such in-place lease, measured over a period equal to the remaining non-cancelable term of the lease. The present value calculation utilizes a discount rate that reflects the risks associated with the leases acquired. The above-market and below-market lease values are amortized as a reduction of and increase to rental revenue, respectively, over the remaining non-cancelable terms of the respective leases. If a tenant terminates its lease prior to its contractual expiration and no future rental payments will be received, any unamortized balance of the market lease intangibles will be written off to rental revenue. The aggregate value of in-place leases represents the costs of leasing costs, other tenant related costs, and lost revenue that the Company did not have to incur by acquiring a property that is already occupied. Factors considered by management in its analysis of the in-place lease intangibles include an estimate of carrying costs during the expected lease-up period for each property taking into account current market conditions and costs to execute similar leases, including leasing commissions and other related expenses. In estimating carrying costs, management includes real estate taxes, insurance and other operating expenses and estimates of lost rentals at market rates during the anticipated lease-up period. The value of in-place leases is amortized to depreciation and amortization expense over the remaining non-cancelable term of the respective leases, but never over a term that exceeds the remaining depreciable life of the building. If a tenant terminates its lease prior to its contractual expiration and no future rental payments will be received, any unamortized balance of the in-place lease intangible will be written off to depreciation and amortization expense. Above-market and below-market ground rent intangibles are recorded for properties acquired in which the Company is the lessee pursuant to a ground lease assumed at acquisition. The above-market and below-market ground rent intangibles are valued similarly to above-market and below-market leases, except that, because the Company is the lessee as opposed to the lessor, the above-market and below-market ground lease values are amortized as a reduction of and increase to rent expense, respectively, over the remaining non-cancelable terms of the respective leases. Intangible assets and liabilities consist of the following: June 30, 2017 December 31, 2016 Intangible assets: In-place leases, net of accumulated amortization of $154,831 and $117,717 $ 506,094 $ 553,924 Above-market leases, net of accumulated amortization of $20,080 and $15,719 53,730 59,647 Below-market ground rent, net of accumulated amortization of $337 and $274 5,046 5,109 Amounts related to assets held for sale, net of accumulated amortization of $456 and $0 (1,639 ) — Total intangible assets $ 563,231 $ 618,680 Intangible liabilities: Below-market leases, net of accumulated amortization of $26,766 and $26,168 $ 176,453 $ 223,110 Above-market ground rent, net of accumulated amortization of $355 and $248 6,946 7,073 Amounts related to liabilities of assets held for sale, net of accumulated amortization of $1,030 and $0 (7,764 ) — Total intangible liabilities $ 175,635 $ 230,183 The following table provides the weighted-average amortization period as of June 30, 2017 for intangible assets and liabilities and the projected amortization expense for the next five years. Weighted-Average Amortization Period (years) July 1 to December 31, 2017 2018 2019 2020 2021 In-place leases 9.2 $ 45,302 $ 85,600 $ 71,830 $ 58,645 $ 50,813 Total to be included in depreciation and amortization expense $ 45,302 $ 85,600 $ 71,830 $ 58,645 $ 50,813 Above-market lease assets 7.2 $ 5,512 $ 10,574 $ 9,377 $ 7,255 $ 6,043 Below-market lease liabilities 18.7 (5,604 ) (11,122 ) (10,787 ) (10,464 ) (10,314 ) Total to be included in rental revenue $ (92 ) $ (548 ) $ (1,410 ) $ (3,209 ) $ (4,271 ) Below-market ground rent 40.9 $ 64 $ 127 $ 127 $ 127 $ 127 Above-market ground rent 32.7 (107 ) (214 ) (214 ) (214 ) (214 ) Total to be included in property operating expense $ (43 ) $ (87 ) $ (87 ) $ (87 ) $ (87 ) The Company recorded $24,167 and $29,615 of amortization of in-place lease intangible assets as part of depreciation and amortization for the three months ended June 30, 2017 and 2016 , respectively. The Company recorded $48,339 and $57,175 of amortization of in-place lease intangible assets as part of depreciation and amortization for the six months ended June 30, 2017 and 2016 , respectively. The Company recorded $4,756 and $5,629 of amortization of market lease intangible assets and liabilities as an increase to rental revenue for the three months ended June 30, 2017 and 2016 , respectively. The Company recorded $5,377 and $5,810 of amortization of market lease intangible assets and liabilities as an increase to rental revenue for the six months ended June 30, 2017 and 2016 , respectively. The Company recorded $(22) and $8 of amortization of ground rent intangible assets and liabilities as part of property operating expense for the three months ended June 30, 2017 and 2016 , respectively. The Company recorded $(43) and $17 of amortization of ground rent intangible assets and liabilities as part of property operating expense for the six months ended June 30, 2017 and 2016 , respectively. Revenue Recognition Real Estate Investments Rental revenue from leases on real estate investments is recognized on a straight-line basis over the term of the lease, regardless of when payments are contractually due. The excess of rental revenue recognized over the amounts contractually due according to the underlying leases are included in other liabilities on the Condensed Consolidated Balance Sheets. For leases on properties that are under construction at the time of acquisition, the Company begins recognition of rental revenue upon completion of construction of the leased asset and delivery of the leased asset to the tenant. The Company’s lease agreements with tenants also generally contain provisions that require tenants to reimburse the Company for real estate taxes, insurance costs, common area maintenance costs, and other property-related expenses. Under lease arrangements in which the Company is the primary obligor for these expenses, such amounts are recognized as both revenues and operating expenses for the Company. Under lease arrangements in which the tenant pays these expenses directly, such amounts are not included in revenues or expenses. These reimbursement amounts are recognized in the period in which the related expenses are incurred. The Company recognizes sales of real estate properties only upon closing. Payments received from purchasers prior to closing are recorded as deposits. Profit on real estate sold is recognized using the full accrual method upon closing when the collectability of the sale price is reasonably assured and the Company is not obligated to perform significant activities after the sale. Profit may be deferred in whole or part until the sale meets the requirements of profit recognition on sale of real estate. Third-Party Management Fees The Company’s asset and property management agreements may contain provisions for fees related to dispositions, administration of the assets including fees related to accounting, valuation and legal services, and management of capital improvements or projects on the underlying assets. The Company recognizes revenue for fees pursuant to its management agreements in the period in which they are earned. Deferred revenue from management fees received prior to the date earned is included in other liabilities on the Condensed Consolidated Balance Sheets. Certain of the Company’s asset management contracts and agreements with its unconsolidated equity investments include provisions that allow it to earn additional fees, generally described as incentive fees or promoted interests, based on the achievement of a targeted valuation or the achievement of a certain internal rate of return on the managed assets held by third parties or the equity investment. The Company recognizes incentive fees on its asset management contracts based upon the amount that would be due pursuant to the contract, if the contract were terminated at the reporting date. If the incentive fee is a fixed amount, only a proportionate share of revenue is recognized at the reporting date, with the remaining fees recognized on a straight-line basis over the measurement period. The Company recognizes promoted interest in the period in which it is determined to be appropriately earned pursuant to the terms of the specific agreement. The values of incentive management fees and promoted interest fees are periodically evaluated by management. For the three months ended June 30, 2017 , the Company did no t recognize any incentive fee revenue and for the six months ended June 30, 2017 , the Company recognized incentive fees of $1,449 . For the three and six months ended June 30, 2016 , the Company recognized incentive fees of $14,217 and $15,190 , respectively. Other Income Other income primarily consists of miscellaneous property related income, lease termination fees, income accretion on the Company’s Retained CDO Bonds, which are measured at fair value on a quarterly basis using a discounted cash flow model, realized foreign currency exchange gains (losses), and interest income. Foreign Currency Gramercy Europe Asset Management performs asset and property management services in the United Kingdom. The Company has unconsolidated equity investments in Europe and Asia and had two wholly-owned properties in Canada and one wholly-owned property in the United Kingdom until their dispositions in March 2017 and December 2016, respectively. The Company also has borrowings outstanding in euros and British pounds sterling under the multicurrency portion of its revolving credit facility. Refer to Note 5 for more information on the Company’s foreign unconsolidated equity investments. Foreign Currency Translation During the periods presented, the Company has had interests in Europe and Canada for which the functional currencies are the euro, the British pound sterling, and the Canadian dollar, respectively. The Company performs the translation from these foreign currencies to the U.S. dollar for assets and liabilities using the exchange rates in effect at the balance sheet date and for revenue and expense accounts using a weighted average exchange rate during the period. The Company reports the gains and losses resulting from such translation as a component of other comprehensive income. For the three and six months ended June 30, 2017 , the Company recorded net translation gains of $1,126 and $1,817 , respectively. For the three and six months ended June 30, 2016 , the Company recorded net translation losses of $8,686 and $2,567 , respectively. Translation gains and losses are reclassified to other income within earnings when the Company has substantially exited from the foreign currency denominated asset or liability. Foreign Currency Transactions A transaction gain or loss realized upon settlement of a foreign currency transaction will be included in earnings for the period in which the transaction is settled. Foreign currency intercompany transactions that are scheduled for settlement are included in the determination of net income. Intercompany foreign currency transactions of a long-term nature that do not have a planned or foreseeable future settlement date, in which the entities to the transactions are consolidated or accounted for by the equity method in the Company’s financial statements, are not included in net income but are reported as a component of other comprehensive income. For the three and six months ended June 30, 2017 , the Company recognized net realized foreign currency

Dispositions, Assets Held for S

Dispositions, Assets Held for Sale, and Discontinued Operations	6 Months Ended
	Jun. 30, 2017
Discontinued Operations and Disposal Groups [Abstract]
Dispositions, Assets Held for Sale, and Discontinued Operations	Dispositions, Assets Held for Sale, and Discontinued Operations Real Estate Dispositions and Impairments During the three and six months ended June 30, 2017 , the Company sold 10 and 17 properties, respectively, as well as two offices that are part of another asset. The property sales in 2017 comprised an aggregate 2,227,753 square feet and generated gross proceeds of $234,985 . During the three and six months ended June 30, 2017 , the Company recognized a net gain on disposals of $2,002 and $19,379 , respectively, related to eight and 15 properties sold during the periods, respectively, as well as two offices sold from another asset. During the three and six months ended June 30, 2017 , the Company recognized impairments of $5,580 and $18,351 , respectively, of which $5,052 is related to three properties held as of June 30, 2017 that were determined to have non-recoverable declines in value during the period, and the remainder is related to properties sold during the periods. Refer to Note 9 for more information on how the Company determined the non-recurring fair value of these properties. The Company sold four and 10 properties during the three and six months ended June 30, 2016 , respectively, and did not recognize a net gain on disposal or impairment loss related to these property sales. Of the properties sold during the six months ended June 30, 2017 , eight of the sales were structured as like-kind exchanges within the meaning of Section 1031 of the IRC. As a result of the sales, the Company deposited $170,202 of the total sale proceeds into an IRC Section 1031 exchange escrow account with a qualified intermediary. The Company then used $140,985 of these funds as consideration for nine property acquisitions during the six months ended June 30, 2017 . Assets Held for Sale The Company separately classifies properties held for sale in the Condensed Consolidated Financial Statements. The Company had four properties and one land parcel within another asset classified as held for sale as of June 30, 2017 with total net asset value of $6,781 and no assets classified as held for sale as of December 31, 2016 . In the normal course of business, the Company identifies non-strategic assets for sale. Real estate investments to be disposed of are reported at the lower of carrying amount or estimated fair value, less costs to sell. Once an asset is classified as held for sale, depreciation and amortization expense is no longer recorded. The following table summarizes the assets held for sale and liabilities related to the assets held for sale as of June 30, 2017 : Assets held for sale June 30, 2017 Real estate investments $ 13,018 Acquired lease assets, net 1,639 Other assets 84 Total assets $ 14,741 Liabilities related to assets held for sale Below-market lease liabilities, net 7,764 Other liabilities 196 Total liabilities $ 7,960 Net assets held for sale $ 6,781 Discontinued Operations The Company’s discontinued operations for the three and six months ended June 30, 2017 and 2016 were related to the assets that were assumed in the Merger and simultaneously designated as held for sale. The following operating results for the three and six months ended June 30, 2017 and 2016 are included in discontinued operations for all periods presented: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Revenues $ 3 $ 140 $ (3 ) $ 5,997 Operating expenses — (56 ) 6 (2,236 ) General and administrative expense (31 ) (26 ) (55 ) (38 ) Interest expense — — — (955 ) Gain on extinguishment of debt — — — 1,930 Net income (loss) from discontinued operations $ (28 ) $ 58 $ (52 ) $ 4,698 Discontinued operations have not been segregated in the Condensed Consolidated Statements of Cash Flows. The table below presents additional relevant information pertaining to results of discontinued operations for the six months ended June 30, 2017 and 2016 , including depreciation, amortization, capital expenditures, and significant operating and investing noncash items: Six Months Ended June 30, 2017 2016 Significant operating noncash items $ — $ (9,452 ) Increase in cash and cash equivalents related to foreign currency translation — 1,045 Total $ — $ (8,407 )

Real Estate Investments

Real Estate Investments	6 Months Ended
	Jun. 30, 2017
Real Estate [Abstract]
Real Estate Investments	Real Estate Investments Property Acquisitions During the six months ended June 30, 2017 , the Company acquired 19 properties comprising 4,750,354 square feet for an aggregate contract purchase price of approximately $302,412 , including the acquisition of a consolidated VIE for $29,605 , a vacant property for $2,400 , and two land parcels for $6,840 . Additionally, during the six months ended June 30, 2017 , the Company acquired two land parcels for an aggregate purchase price of $2,800 , on which it has committed to construct an industrial facility for an estimated $25,805 with projected completion in October 2017 and an industrial facility for an estimated $23,272 with projected completion in March 2018. Total value of the properties acquired during the six months ended June 30, 2017 was comprised of $277,979 of real estate assets, $29,892 of intangible assets, and $2,709 of intangible liabilities, including acquisition costs capitalized for the asset acquisitions. Property Purchase Price Allocations As described in Note 2 , during the first quarter of 2017 the Company adopted ASU 2017-01, Amendments to Business Combinations, which amends the definition of a business and provides a revised framework for the determination of whether an integrated set of assets and activities meets the definition of a business. The Company evaluated its real estate acquisitions during the six months ended June 30, 2017 under the new framework and, accordingly, accounted for the transactions as asset acquisitions. Prior to adoption of ASU 2017-01 in 2017, the majority of the Company’s acquisitions were accounted for as business combinations. Of the acquisitions prior to 2017, there were 21 properties acquired in 2016 that were accounted for as business combinations which had preliminary purchase price allocations recorded as of December 31, 2016. The Company finalized the purchase price allocations of these 21 properties during the first quarter of 2017. The aggregate changes recorded from the preliminary purchase price allocations to the finalized purchase price allocations, are shown in the table below and are reflected in earnings for the six months ended June 30, 2017 : Preliminary Allocations recorded Finalized Allocations recorded Real Estate Assets Intangible Assets Intangible Liabilities Real Estate Assets Intangible Assets Intangible Liabilities Decrease to Rental Revenue Increase to Depreciation and Amortization Expense $ 513,424 $ 61,178 $ 11,093 $ 513,087 $ 60,627 $ 10,205 $ 27 $ 16

Unconsolidated Equity Investmen

Unconsolidated Equity Investments	6 Months Ended
	Jun. 30, 2017
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]
Unconsolidated Equity Investments	Unconsolidated Equity Investments The Company accounts for substantially all of its unconsolidated equity investments under the equity method of accounting because it exercises significant influence, but does not unilaterally control the entities, and is not considered to be the primary beneficiary. In unconsolidated equity investments, the rights of the other investors are protective and participating. Unless the Company is determined to be the primary beneficiary, these rights preclude it from consolidating the investments. The investments are recorded initially at cost as unconsolidated equity investments, as applicable, and subsequently are adjusted for equity interest in net income and contributions and distributions. The amount of the investments on the Condensed Consolidated Balance Sheets is evaluated for impairment at each reporting period. None of the unconsolidated equity investment debt is recourse to the Company. Transactions with unconsolidated equity method entities are eliminated to the extent of the Company’s ownership in each such entity. Accordingly, the Company’s share of net income of these equity method entities is included in consolidated net income. As a result of the Merger in 2015, the Company acquired an interest in four unconsolidated entities, the Goodman Europe JV, the Goodman UK JV, the Duke JV, and CBRE Strategic Partners Asia. The Company’s equity investment in the entities was fair valued on the Merger closing date, and the difference between the historical carrying value of the net assets and the fair value was recorded as a basis difference, which is amortized to equity in net income from unconsolidated equity investments over the remaining weighted average useful life of the underlying assets of each entity. As of June 30, 2017 and December 31, 2016 , the Company owned properties through unconsolidated equity investments and had investment interests in these unconsolidated entities as follows: As of June 30, 2017 As of December 31, 2016 Investment Ownership % Voting Interest % Partner Investment in Unconsolidated Equity Investment 1 No. of Properties Investment in Unconsolidated Equity Investment 1 No. of Properties Gramercy European Property Fund 2 14.2 % 14.2 % Various $ 55,724 30 $ 50,367 26 Goodman Europe JV 3 5.1 % 5.1 % Gramercy European Property Fund 3,370 8 3,491 8 Strategic Office Partners 25.0 % 25.0 % TPG Real Estate 23,079 10 15,872 6 Goodman UK JV 80.0 % 50.0 % Goodman Group 26,086 2 25,309 2 CBRE Strategic Partners Asia 5.07 % 5.07 % Various 3,995 2 4,145 2 Philips JV 25.0 % 25.0 % Various — 1 — 1 Morristown JV 50.0 % 50.0 % 21 South Street 2,626 1 2,623 1 Total $ 114,880 54 $ 101,807 46 1. The amounts presented include basis differences of $2,406 and $4,025 , net of accumulated amortization, for the Goodman Europe JV and Goodman UK JV, respectively, as of June 30, 2017 . The amounts presented include basis differences of $2,286 and $3,941 , net of accumulated amortization, for the Goodman Europe JV and Goodman UK JV, respectively, as of December 31, 2016 . 2. Includes European Fund Carry Co., which has a carrying value of $5 and $8 for the Company’s 25.0% interest as of June 30, 2017 and December 31, 2016 , respectively. 3. As of June 30, 2017 , the Company has a 5.1% direct interest in the Goodman Europe JV as well as an indirect interest in the remaining 94.9% interest of Goodman Europe JV through its 14.2% interest in the Gramercy European Property Fund. In the table above, as of December 31, 2016, the Company’s 94.9% interest in Goodman Europe JV held through its 14.2% interest in the Gramercy European Property Fund is included in the amount shown for the Gramercy European Property Fund and the Company’s 5.1% direct interest in the Goodman Europe JV is presented separately as the amount shown for the Goodman Europe JV. The following is a summary of the Company’s unconsolidated equity investments for the six months ended June 30, 2017 : Unconsolidated Equity Investments Balance at January 1, 2017 $ 101,807 Contributions to unconsolidated equity investments 7,400 Equity in net income of unconsolidated equity investments, including adjustments for basis differences 154 Other comprehensive income of unconsolidated equity investments 6,208 Distributions from unconsolidated equity investments (689 ) Balance at June 30, 2017 $ 114,880 Gramercy European Property Fund In December 2014, the Company, along with several equity investment partners, formed the Gramercy European Property Fund, a private real estate investment fund that targets single-tenant industrial, office and specialty retail assets throughout Europe. In the second quarter of 2016, the Gramercy European Property Fund acquired the Goodman Group’s 20.0% interest in the Goodman Europe JV and 74.9% of the Company’s 80.0% interest in the Goodman Europe JV. As of June 30, 2017 and December 31, 2016 , the Company had a 14.2% interest in the Gramercy European Property Fund, which had a 94.9% ownership interest in the Goodman Europe JV. As of June 30, 2017 and December 31, 2016 , the Company had a 5.1% direct interest in the Goodman Europe JV, as well as an indirect interest in the remaining 94.9% interest held through the Company’s 14.2% interest in the Gramercy European Property Fund. In July 2017, the Gramercy European Property Fund sold 100.0% of its assets to a third party. Refer to Note 17 for more information on the sale transaction. Since inception, the equity investors, including the Company, have collectively funded $395,213 ( €352,500 ) in equity capital to the Gramercy European Property Fund. As of June 30, 2017 and December 31, 2016 , the Company's cumulative contributions to the Gramercy European Property Fund were $55,892 ( €50,000 ). As of June 30, 2017 , the remaining commitments of all equity investors to the Gramercy European Property Fund were $57,130 ( €50,000 ), including $14,283 ( €12,500 ) from the Company. During the three and six months ended June 30, 2017 , the Company received distributions of $337 and $689 , respectively, from the Goodman Europe JV. During the six months ended June 30, 2017 and the year ended December 31, 2016 , the Gramercy European Property Fund acquired four and 13 properties, respectively, and in 2016 also acquired the Company's 5.1% interest in one property located in Lille, France held by the Goodman Europe JV. Refer to Note 8 for additional information on the equity transactions related to the Gramercy European Property Fund and Goodman Europe JV. As of June 30, 2017 , there were 30 properties in the Gramercy European Property Fund and eight additional properties held in the Goodman Europe JV. Strategic Office Partners In August 2016, the Company partnered with TPG Real Estate, or TPG, to form Strategic Office Partners, an unconsolidated equity investment created for the purpose of acquiring, owning, operating, leasing and selling single-tenant office properties located in high-growth metropolitan areas in the United States. In September 2016, the Company contributed six properties to Strategic Office Partners and during the six months ended June 30, 2017 , Strategic Office Partners acquired four properties. The Company provides asset and property management, accounting, construction, and leasing services to Strategic Office Partners, for which it earns management fees and is entitled to a promoted interest. TPG and the Company have committed to fund an aggregate $400,000 to Strategic Office Partners, including $100,000 from the Company. During the three and six months ended June 30, 2017 , the Company contributed $4,750 and $7,400 , respectively, to Strategic Office Partners and as of June 30, 2017 , the Company's remaining commitment is $76,573 . During the three and six months ended June 30, 2017 , the Company received no distributions from the Strategic Office Partners. Goodman UK JV The Goodman UK JV invests in industrial properties in the United Kingdom. During the three and six months ended June 30, 2017 , the Company received no distributions from the Goodman UK JV. Duke JV The Duke JV invested in industrial and office properties located throughout the United States. In June 2016, the Company and Duke entered into a Dissolution and Liquidation Agreement, pursuant to which the Duke JV distributed seven of its properties to the Company and one of its properties to Duke on June 30, 2016, then was dissolved in July 2016 following the disposition of its remaining property and final distributions of cash to its members. CBRE Strategic Partners Asia CBRE Strategic Partners Asia is a real estate investment fund with investments in China. CBRE Strategic Partners Asia has an eight -year term, which began on January 31, 2008 and may be extended for up to two one -year periods with the approval of two-thirds of the limited partners. In March 2016, the limited partners approved a one-year extension. CBRE Strategic Partners Asia's commitment period has ended, however, it may call capital to fund operations, obligations and liabilities. During the three and six months ended June 30, 2017 , the Company did not receive any distributions from CBRE Strategic Partners Asia. In February 2017, the fund commenced liquidation and will wind up over the succeeding 24 months. Philips JV The Company has a 25.0% interest in 200 Franklin Square Drive, a 199,900 square foot building located in Somerset, New Jersey which is 100.0% net leased to Philips Holdings, USA Inc., a wholly-owned subsidiary of Royal Philips Electronics, through December 2021, or the Philips JV. During the three and six months ended June 30, 2017 , the Company received no distributions and recognized no revenue from the Philips JV. Morristown JV In October 2015, the Company contributed 50.0% of its interest in an office property located in Morristown, New Jersey to a joint venture the Company formed with 21 South Street, a subsidiary of Hampshire Partners Fund VIII LP, or the Morristown JV. Concurrent with the contribution, the Company sold the remaining 50.0% equity interest of the property to 21 South Street. The balance sheets for the Company’s unconsolidated equity investments at June 30, 2017 are as follows: Gramercy European Property Fund 1 Goodman Europe JV Gramercy European Property Fund 2 Total Strategic Office Partners Goodman UK JV CBRE Strategic Partners Asia Other 3 Assets: Real estate assets, net 4 $ 238,253 $ 612,357 $ 850,610 $ 242,396 $ 31,614 $ 85,653 $ 49,065 Other assets 29,136 70,248 99,384 50,557 1,921 11,518 3,121 Total assets $ 267,389 $ 682,605 $ 949,994 $ 292,953 $ 33,535 $ 97,171 $ 52,186 Liabilities and members’ equity: Mortgage notes payable $ 150,436 $ 330,514 $ 480,950 $ 187,791 $ — $ — $ 39,270 Other liabilities 6,963 55,511 62,474 10,767 735 14,371 3,377 Total liabilities 157,399 386,025 543,424 198,558 735 14,371 42,647 Gramercy Property Trust equity 12,290 46,799 59,089 23,079 26,086 3,995 2,631 Other members’ equity 97,700 249,781 347,481 71,316 6,714 78,805 6,908 Liabilities and members’ equity $ 267,389 $ 682,605 $ 949,994 $ 292,953 $ 33,535 $ 97,171 $ 52,186 1. As of June 30, 2017 , the Company has a 5.1% direct interest in the Goodman Europe JV as well as an indirect interest in the remaining 94.9% i nterest that is held through the Company’s 14.2% interest in the Gramercy European Property Fund. In the table above, the Company’s equity interest in the Goodman Europe JV includes both its direct 5.1% interest as well as its indirect interest that is held through its 14.2% interest in the Gramercy European Property Fund, and the Company’s equity interest in the Gramercy European Property Fund represents its interest in all of the properties owned by the Gramercy European Property Fund except for the properties in the Goodman Europe JV. 2. Excludes the Gramercy European Property Fund’s 94.9% interest in the Goodman Europe JV. 3. Includes the Philips JV, the Morristown JV, and European Fund Carry Co. 4. Includes basis adjustments that were recorded by the Company to adjust the unconsolidated equity investments to fair value upon closing of the Merger. The balance sheets for the Company’s unconsolidated equity investments at December 31, 2016 are as follows: Gramercy European Property Fund 1 Goodman Europe JV Gramercy European Property Fund 2 Total Strategic Office Partners Goodman UK JV CBRE Strategic Partners Asia Other 3 Assets: Real estate assets, net 4 $ 285,087 $ 347,069 $ 632,156 $ 149,484 $ 25,128 $ 87,852 $ 49,580 Other assets 86,273 63,523 149,796 42,323 6,650 12,247 3,020 Total assets $ 371,360 $ 410,592 $ 781,952 $ 191,807 $ 31,778 $ 100,099 $ 52,600 Liabilities and members' equity: Mortgage notes payable $ 174,269 $ 215,980 $ 390,249 $ 121,894 $ — $ — $ 39,730 Other liabilities 7,778 19,940 27,718 4,347 934 14,383 3,259 Total liabilities 182,047 235,920 417,967 126,241 934 14,383 42,989 Gramercy Property Trust equity 12,734 41,116 53,850 15,872 25,309 4,145 2,631 Other members' equity 176,579 133,556 310,135 49,694 5,535 81,571 6,980 Liabilities and members' equity $ 371,360 $ 410,592 $ 781,952 $ 191,807 $ 31,778 $ 100,099 $ 52,600 1. As of December 31, 2016 , the Company has a 5.1% direct interest in the Goodman Europe JV as well as an indirect interest in the remaining 94.9% interest that is held through the Company’s 14.2% interest in the Gramercy European Property Fund. In the table above, the Company’s equity interest in the Goodman Europe JV includes both its direct 5.1% interest as well as its indirect interest that is held through its 14.2% interest in the Gramercy European Property Fund, and the Company’s equity interest in the Gramercy European Property Fund represents its interest in all of the properties owned by the Gramercy European Property Fund except for the properties in the Goodman Europe JV. 2. Excludes the Gramercy European Property Fund’s 94.9% interest in the Goodman Europe JV. 3. Includes the Philips JV, the Morristown JV, and European Fund Carry Co. 4. Includes basis adjustments that were recorded by the Company to adjust the unconsolidated equity investments to fair value upon closing of the Merger. Certain real estate assets in the Company’s unconsolidated equity investments are subject to mortgage notes. The following is a summary of the secured financing arrangements within the Company’s unconsolidated equity investments as of June 30, 2017 : Outstanding Balance 2 Property Unconsolidated Equity Investment Economic Ownership Interest Rate 1 Maturity Date June 30, 2017 December 31, 2016 Strategic Office Partners portfolio 3 Strategic Office Partners 25.0% 4.08% 10/7/2019 $ 191,600 $ 125,000 Durrholz, Germany Gramercy European Property Fund 14.2% 1.52% 3/31/2020 13,197 12,289 Venray, Germany Gramercy European Property Fund 14.2% 3.32% 12/2/2020 14,068 13,015 Lille, France Gramercy European Property Fund 14.2% 3.13% 12/17/2020 29,422 27,081 Carlisle, United Kingdom Gramercy European Property Fund 14.2% 3.32% 2/19/2021 11,022 10,443 Saint Martin, France Gramercy European Property Fund 14.2% 2.67% 4/25/2021 15,608 — Castelnau, France Gramercy European Property Fund 14.2% 2.67% 4/25/2021 11,243 — Oud Beijerland, Netherlands Gramercy European Property Fund 14.2% 2.09% 12/30/2022 8,704 8,077 Zaandam, Netherlands Gramercy European Property Fund 14.2% 2.08% 12/30/2022 12,551 11,647 Kerkrade, Netherlands Gramercy European Property Fund 14.2% 2.08% 12/30/2022 10,369 9,622 Friedrichspark, Germany Gramercy European Property Fund 14.2% 2.08% 12/30/2022 9,370 8,694 Fredersdorf, Germany Gramercy European Property Fund 14.2% 2.08% 12/30/2022 12,120 11,247 Breda, Netherlands Gramercy European Property Fund 14.2% 1.90% 12/30/2022 10,721 9,948 Juechen, Germany Gramercy European Property Fund 14.2% 1.89% 12/30/2022 20,316 18,852 Piaseczno, Poland Gramercy European Property Fund 14.2% 1.98% 12/30/2022 8,773 8,141 Strykow, Poland Gramercy European Property Fund 14.2% 1.98% 12/30/2022 20,657 19,167 Uden, Netherlands Gramercy European Property Fund 14.2% 1.98% 12/30/2022 9,606 8,913 Rotterdam, Netherlands Gramercy European Property Fund 14.2% 1.89% 12/30/2022 8,227 7,633 Frechen, Germany Gramercy European Property Fund 14.2% 1.49% 12/30/2022 6,518 6,043 Meerane, Germany Gramercy European Property Fund 14.2% 1.35% 12/30/2022 10,945 10,138 Amsterdam, Netherlands Gramercy European Property Fund 14.2% 1.59% 12/30/2022 3,339 3,093 Tiel, Netherlands Gramercy European Property Fund 14.2% 1.59% 12/30/2022 9,904 9,174 Netherlands portfolio 4 Gramercy European Property Fund 14.2% 3.02% 6/28/2023 14,568 13,409 Kutno, Poland Gramercy European Property Fund 14.2% 1.91% 7/21/2023 6,399 5,890 European Facility 5 Goodman Europe JV 18.6% 6 0.90% 11/16/2023 34,277 31,551 European Facility 5 Goodman Europe JV 18.6% 6 1.75% 11/16/2023 116,159 106,917 Utrecht, Netherlands Gramercy European Property Fund 14.2% 1.95% 1/16/2024 39,277 — Worksop, United Kingdom Gramercy European Property Fund 14.2% 3.94% 10/20/2026 11,006 10,551 Somerset, NJ Philips JV 25.0% 6.90% 9/11/2035 39,270 39,730 Total mortgage notes payable $ 709,236 $ 546,265 Net deferred financing costs and net debt premium (1,225 ) 5,608 Total mortgage notes payable, net $ 708,011 $ 551,873 1. Represents the current effective rate as of June 30, 2017 , including the swapped interest rate for mortgage notes that have interest rate swaps. The current interest rate is not adjusted to include the amortization of fair market value premiums or discounts. 2. Mortgage notes are presented at 100.0% of the amount held by the unconsolidated equity investment. 3. There are ten properties under this mortgage note. 4. There are five properties under this mortgage note. 5. There are eight properties under this mortgage facility. 6. Represents the Company’s economic ownership in the Goodman Europe JV, which includes both its 5.1% direct interest in the Goodman Europe JV as well as an indirect interest in the remaining 94.9% interest that is held through the Company’s 14.2% interest in the Gramercy European Property Fund. The statements of operations for the Company’s unconsolidated equity investments for the three months ended June 30, 2017 are as follows: Gramercy European Property Fund 1 Goodman Europe JV Gramercy European Property Fund 2 Total Strategic Office Partners Goodman UK JV CBRE Strategic Partners Asia Other 3 Revenues $ 5,323 $ 11,479 $ 16,802 $ 7,174 $ 293 $ 230 $ 1,094 Operating expenses 945 2,802 3,747 2,316 225 283 116 Interest expense 614 1,798 2,412 2,055 — — 700 Depreciation and amortization 2,024 5,322 7,346 2,852 261 — 333 Total expenses 3,583 9,922 13,505 7,223 486 283 1,149 Net income (loss) from operations 1,740 1,557 3,297 (49 ) (193 ) (53 ) (55 ) Gain (loss) on derivatives — 1,049 1,049 (413 ) — — — Provision for taxes (15 ) (424 ) (439 ) — (20 ) — — Net income (loss) $ 1,725 $ 2,182 $ 3,907 $ (462 ) $ (213 ) $ (53 ) $ (55 ) Company's share in net income (loss) $ 88 $ 439 $ 527 $ (36 ) $ (171 ) $ (4 ) $ 9 Adjustments for REIT basis (37 ) — (37 ) — (40 ) — — Company's equity in net income (loss) within continuing operations $ 51 $ 439 $ 490 $ (36 ) $ (211 ) $ (4 ) $ 9 1. As of and for the three months ended June 30, 2017 , the Company had a 5.1% direct interest in the Goodman Europe JV as well as an indirect interest in the remaining 94.9% interest that is held through the Company’s 14.2% interest in the Gramercy European Property Fund. For the three months ended June 30, 2017 , the Company’s equity in net income (loss) of the entities is based on these ownership interest percentages during the period. 2. Excludes the results of the Gramercy European Property Fund’s 94.9% interest in the Goodman Europe JV, as the Goodman Europe JV is separately presented. 3. Includes the Philips JV, the Morristown JV, and European Fund Carry Co. The statements of operations for the Company’s unconsolidated equity investments for the six months ended June 30, 2017 are as follows: Gramercy European Property Fund 1 Goodman Europe JV Gramercy European Property Fund 2 Total Strategic Office Partners Goodman UK JV CBRE Strategic Partners Asia Other 3 Revenues $ 10,278 $ 21,597 $ 31,875 $ 12,700 $ 588 $ (2,215 ) $ 2,208 Operating expenses 1,867 5,753 7,620 3,790 527 701 274 Interest expense 1,286 3,272 4,558 3,565 — — 1,341 Depreciation and amortization 4,045 9,795 13,840 5,355 636 — 666 Total expenses 7,198 18,820 26,018 12,710 1,163 701 2,281 Net income (loss) from operations 3,080 2,777 5,857 (10 ) (575 ) (2,916 ) (73 ) Gain (loss) on derivatives — 2,270 2,270 (762 ) — — — Provision for taxes (32 ) (278 ) (310 ) — (28 ) — — Net income (loss) $ 3,048 $ 4,769 $ 7,817 $ (772 ) $ (603 ) $ (2,916 ) $ (73 ) Company's share in net income (loss) $ 155 $ 885 $ 1,040 $ (51 ) $ (483 ) $ (150 ) $ — Adjustments for REIT basis (73 ) — (73 ) — (129 ) — — Company's equity in net income (loss) within continuing operations $ 82 $ 885 $ 967 $ (51 ) $ (612 ) $ (150 ) $ — 1. As of and for the six months ended June 30, 2017 , the Company had a 5.1% direct interest in the Goodman Europe JV as well as an indirect interest in the remaining 94.9% interest that is held through the Company’s 14.2% interest in the Gramercy European Property Fund. For the six months ended June 30, 2017 , the Company’s equity in net income (loss) of the entities is based on these ownership interest percentages during the period. 2. Excludes the results of the Gramercy European Property Fund’s 94.9% interest in the Goodman Europe JV, as the Goodman Europe JV is separately presented. 3. Includes the Philips JV, the Morristown JV, and European Fund Carry Co. The statements of operations for the Company’s unconsolidated equity investments for the three months ended June 30, 2016 are as follows: Gramercy European Property Fund 1 Goodman Europe JV Gramercy European Property Fund Total Goodman UK JV Duke JV CBRE Strategic Partners Asia Other 2 Revenues $ 6,073 $ 5,884 $ 11,957 $ 636 $ 8,860 $ 1,024 $ 1,083 Operating expenses 833 1,068 1,901 186 2,128 288 85 Acquisition expenses 4,960 1,871 6,831 — — — 23 Interest expense 944 967 1,911 — 167 — 704 Depreciation and amortization 2,342 2,487 4,829 371 3,424 — 333 Total expenses 9,079 6,393 15,472 557 5,719 288 1,145 Net income (loss) from operations (3,006 ) (509 ) (3,515 ) 79 3,141 736 (62 ) Loss on derivatives — (1,489 ) (1,489 ) — — — — Provision for taxes — (276 ) (276 ) — — — — Net income (loss) $ (3,006 ) $ (2,274 ) $ (5,280 ) $ 79 $ 3,141 $ 736 $ (62 ) Company's share in net income (loss) $ (2,405 ) $ (438 ) $ (2,843 ) $ 63 $ 2,513 $ 36 $ 11 Adjustments for REIT basis 931 — 931 (7 ) (872 ) — — Company's equity in net income (loss) within continuing operations $ (1,474 ) $ (438 ) $ (1,912 ) $ 56 $ 1,641 $ 36 $ 11 1. As of June 30, 2016 , the Company has a 5.1% direct interest in the Goodman Europe JV as well as an indirect interest in the remaining 94.9% interest that is held through the Company’s 14.2% interest in the Gramercy European Property Fund. For the three months ended June 30, 2016 , the Company recorded its equity in net income (loss) from the Goodman Europe JV and the Gramercy European Property Fund based upon its day-weighted equity interest in the entities throughout the three months, which was 80.0% for Goodman Europe JV and 19.3% for the Gramercy European Property Fund. 2. Includes the Philips JV, the Morristown JV, and European Fund Carry Co. The statements of operations for the Company’s unconsolidated equity investments for the six months ended June 30, 2016 are as follows: Gramercy European Property Fund 1 Goodman Europe JV Gramercy European Property Fund Total Goodman UK JV Duke JV CBRE Strategic Partners Asia Other 2 Revenues $ 12,194 $ 10,941 $ 23,135 $ 4,920 $ 19,395 $ 242 $ 2,164 Operating expenses 1,696 1,569 3,265 473 5,118 867 213 Acquisition expenses 4,960 2,537 7,497 — — — 27 Interest expense 1,866 1,894 3,760 — 602 — 1,432 Depreciation and amortization 4,631 4,833 9,464 1,121 7,152 — 666 Total expenses 13,153 10,833 23,986 1,594 12,872 867 2,338 Net income (loss) from operations (959 ) 108 (851 ) 3,326 6,523 (625 ) (174 ) Loss on derivatives — (5,303 ) (5,303 ) — — — — Loss on extinguishment of debt — — — — (7,962 ) — — Net gain on disposals — — — — 38,535 — — Provision for taxes — (591 ) (591 ) — — — — Net income (loss) $ (959 ) $ (5,786 ) $ (6,745 ) $ 3,326 $ 37,096 $ (625 ) $ (174 ) Company's share in net income (loss) $ (768 ) $ (1,133 ) $ (1,901 ) $ 2,661 $ 29,675 $ (36 ) $ 4 Adjustments for REIT basis 445 — 445 (278 ) (33,493 ) — — Company's equity in net income (loss) within continuing operations $ (323 ) $ (1,133 ) $ (1,456 ) $ 2,383 $ (3,818 ) $ (36 ) $ 4 1. As of June 30, 2016, the Company has a 5.1% direct interest in the Goodman Europe JV as well as an indirect interest in the remaining 94.9% interest that is held through the Company’s 14.2% interest in the Gramercy European Property Fund. For the six months ended June 30, 2016, the Company recorded its equity in net income (loss) from the Goodman Europe JV and the Gramercy European Property Fund based upon its day-weighted equity interest in the entities throughout the six months, which was 80.0% for Goodman Europe JV and 19.6% for the Gramercy European Property Fund. 2. Includes the Philips JV, the Morristown JV, and European Fund Carry Co.

Debt Obligations

Debt Obligations	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Debt Obligations	Debt Obligations Secured Debt Mortgage Notes Certain real estate assets are subject to mortgage notes. During the six months ended June 30, 2017 , the Company assumed $3,680 of non-recourse mortgages in connection with one real estate acquisition. During the year ended December 31, 2016, the Company assumed $244,188 of non-recourse mortgages in connection with 27 real estate acquisitions. During the three and six months ended June 30, 2017 , the Company paid off the mortgage notes on two properties. During the six months ended June 30, 2017 , the Company refinanced the debt on two properties encumbered by a mortgage loan for $10,456 and subsequently transferred the mortgage on these two properties to the buyer of the properties. During the three and six months ended June 30, 2017 , the Company recorded a net gain on the early extinguishment of debt of $268 and $60 , respectively. During the three and six months ended June 30, 2016, the Company paid off the mortgage notes on two and eight properties, respectively, and during the six months ended June 30, 2016, the Company transferred one property encumbered by a mortgage note. As a result of the loan payoffs and transfer, for the three and six months ended June 30, 2016, the Company recorded a net gain (loss) on early extinguishment of debt of $(1,356) and $(7,113) , including net gains on extinguishment of debt of $0 and $1,930 within discontinued operations, respectively. The Company’s gains and losses recorded for extinguishments of debt are related to unamortized deferred financing costs and mortgage premiums and discounts that were immediately expensed upon termination as well as early termination fees incurred. The Company’s mortgage notes include a series of financial and other covenants with which the Company must comply in order to borrow under them. The Company was in compliance with the covenants under the mortgage note facilities as of June 30, 2017 . The following is a summary of the Company’s secured financing arrangements as of June 30, 2017 and December 31, 2016 : Property Interest Rate 1 Maturity Date Outstanding Balance June 30, 2017 December 31, 2016 Logistics Portfolio - Pool 2 2 4.48% 1/1/2018 $ 35,926 $ 36,279 Dallas, TX 3 3.05% 3/1/2018 9,429 9,540 Cincinnati, KY 3 3.29% 3/1/2018 6,552 6,628 Jacksonville, FL 3 3.05% 3/1/2018 6,773 6,852 Phoenix, AZ 3 3.05% 3/1/2018 4,073 4,120 Minneapolis, MN 3 3.05% 3/1/2018 5,932 6,001 Ames, IA 5.05% 5/1/2018 16,191 16,436 Columbus, OH 4.01% 5/31/2018 19,240 19,708 Greenwood, IN 3.59% 6/15/2018 7,347 7,436 Greenfield, IN 3.63% 6/15/2018 5,938 6,010 Logistics Portfolio - Pool 3 2 3.96% 8/1/2018 43,300 43,300 Philadelphia, PA 4.99% 1/1/2019 12,137 12,328 Columbus, OH 3.94% 1/31/2019 5,815 5,908 Bridgeview, IL 3.90% 5/1/2019 5,928 6,014 Spartanburg, SC 3.20% 6/1/2019 831 1,025 Charleston, SC 3.11% 8/1/2019 725 986 Lawrence, IN 5.02% 1/1/2020 20,385 20,703 Charlotte, NC 3.28% 1/1/2020 1,882 2,217 Hawthorne, CA 3.52% 8/1/2020 17,402 17,638 Charleston, SC 2.97% 10/1/2020 866 984 Charleston, SC 3.37% 10/1/2020 866 984 Charleston, SC 3.32% 10/1/2020 881 1,001 Charlotte, NC 3.38% 10/1/2020 751 853 Des Plaines, IL 5.54% 10/31/2020 2,425 2,463 Waco, TX 4.75% 12/19/2020 15,038 15,187 Deerfield, IL 3.71% 1/1/2021 10,628 10,804 Winston-Salem, NC 3.41% 6/1/2021 3,782 4,199 Winston-Salem, NC 3.42% 7/1/2021 1,253 1,388 Logistics Portfolio - Pool 1 2 4.27% 1/1/2022 38,600 39,002 CCC Portfolio 2 4.24% 10/6/2022 23,048 23,280 Logistics Portfolio - Pool 4 2 4.36% 12/5/2022 79,500 79,500 KIK USA Portfolio 2 4.31% 7/6/2023 7,303 7,450 Yuma, AZ 5.27% 12/6/2023 11,959 12,058 Allentown, PA 5.16% 1/6/2024 22,885 23,078 Spartanburg, SC 3.72% 2/1/2024 6,003 6,360 Durham, NC 4.02% 9/6/2024 3,664 — Charleston, SC 3.80% 2/1/2025 6,334 6,658 Hackettstown, NJ 5.49% 3/6/2026 9,519 9,550 Hutchins, TX 5.41% 6/1/2029 22,182 22,764 Buford, GA 4.67% 7/1/2017 — 15,512 Woodcliff Lake, NJ 3.04% 9/15/2017 — 35,366 KIK Canada Portfolio 2 3.57% 5/5/2019 — 7,914 Total mortgage notes payable $ 493,293 $ 555,484 Net deferred financing costs and net debt premium 2,111 3,158 Total mortgage notes payable, net $ 495,404 $ 558,642 1. Represents the interest rate as of June 30, 2017 or date of extinguishment if the mortgage note was extinguished during the period, that was recorded for financial reporting purposes, which reflects the effect of interest rate swaps and amortization of financing costs and fair market value premiums or discounts. 2. There are five properties under the Logistics Portfolio - Pool 2 mortgage, two properties under the Logistics Portfolio - Pool 3 mortgage, three properties under the Logistics Portfolio - Pool 1 mortgage, five properties under the CCC Portfolio mortgage, six properties under the Logistics Portfolio - Pool 4 mortgage, three properties under the KIK USA Portfolio mortgage, and two properties under the KIK Canada Portfolio mortgage. 3. These five mortgage notes are cross-collateralized. Unsecured Debt 2015 Credit Facility and Term Loans In December 2015, the Company entered into an agreement, or the Credit Agreement, for a new $1,900,000 credit facility, or the 2015 Credit Facility, consisting of an $850,000 senior unsecured revolving credit facility, or the 2015 Revolving Credit Facility, and $1,050,000 term loan facility with JPMorgan Securities LLC and Merrill Lynch, Pierce, Fenner and Smith Incorporated and terminated Legacy Gramercy's 2014 Credit Facility. The 2015 Revolving Credit Facility consists of a $750,000 U.S. dollar revolving credit facility and a $100,000 multicurrency revolving credit facility. The 2015 Revolving Credit Facility matures in January 2020, but may be extended for two additional six month periods upon the payment of applicable fees and satisfaction of certain customary conditions. The term loan facility, or the 2015 Term Loan, consists of a $300,000 term loan facility that matures in January 2019 with one 12-month extension option, or the 3-Year Term Loan, and a $750,000 term loan facility that matures in January 2021, or the 5-Year Term Loan. Outstanding borrowings under the 2015 Revolving Credit Facility incur interest at a floating rate based upon, at the Company’s option, either (i) adjusted London Interbank Offered Rate, or LIBOR, plus an applicable margin ranging from 0.875% to 1.55% , depending on the Company’s credit ratings, or (ii) the alternate base rate plus an applicable margin ranging from 0.00% to 0.55% , depending on the Company’s credit ratings. The Company is also required to pay quarterly in arrears a 0.125% to 0.30% facility fee, depending on the Company's credit ratings, on the total commitments under the 2015 Revolving Credit Facility. Outstanding borrowings under the 2015 Term Loan incur interest at a floating rate based upon, at the Company’s option, either (i) adjusted LIBOR plus an applicable margin ranging from 0.90% to 1.75% , depending on the Company’s credit ratings, or (ii) the alternate base rate plus an applicable margin ranging from 0.00% to 0.75% , depending on the Company’s credit ratings. The alternate base rate is the greater of (x) the prime rate announced by JPMorgan Chase Bank, N.A., (y) 0.50% above the Federal Funds Effective Rate and (z) the adjusted LIBOR for a one-month interest period plus 1.00% . In December 2015, the Company also entered into a new $175,000 seven-year unsecured term loan with Capital One, N.A., or the 7-Year Term Loan, which matures in January 2023. Outstanding borrowings under the 7-Year Term Loan incur interest at a floating rate based upon, at the Company’s option, either (i) adjusted LIBOR plus an applicable margin ranging from 1.30% to 2.10% , depending on the Company’s credit ratings, or (iii) the alternate base rate plus an applicable margin ranging from 0.30% to 1.10% , depending on the Company’s credit ratings. The alternate base rate is the greatest of (x) the prime rate announced by Capital One, (y) 0.50% above the Federal Funds Effective Rate, and (z) the adjusted LIBOR for a one-month interest period plus 1.00% . The Company’s unsecured borrowing facilities include a series of financial and other covenants that the Company has to comply with in order to borrow under the facilities. The Company was in compliance with the covenants under the facilities as of June 30, 2017 . Refer to the table at the end of Note 6 for specific terms and the Company’s outstanding borrowings under the facilities. Senior Unsecured Notes During 2015 and 2016, the Company issued and sold an aggregate $500,000 principal amount of senior unsecured notes payable in private placements, which have maturities ranging from 2022 through 2026 and bear interest semiannually at rates ranging from 3.89% to 4.97% . Refer to the table later in Note 6 for specific terms of the Company's Senior Unsecured Notes. Exchangeable Senior Notes On March 18, 2014, the Company issued $115,000 of 3.75% Exchangeable Senior Notes. The Exchangeable Senior Notes are senior unsecured obligations of a subsidiary of the Operating Partnership and are guaranteed by the Company on a senior unsecured basis. The Exchangeable Senior Notes mature on March 15, 2019, unless redeemed, repurchased or exchanged in accordance with their terms prior to such date and will be exchangeable, under certain circumstances, for cash, for common shares or for a combination of cash and common shares, at the election of the Operating Partnership. The Exchangeable Senior Notes will also be exchangeable prior to the close of business on the second scheduled trading day immediately preceding the stated maturity date, at any time beginning on December 15, 2018, and also upon the occurrence of certain events. On or after March 20, 2017, in certain circumstances, the Operating Partnership may redeem all or part of the Exchangeable Senior Notes for cash at a price equal to 100.0% of the principal amount of the Exchangeable Senior Notes to be redeemed, plus accrued and unpaid interest up to, but excluding, the redemption date. During June 2017, the Exchangeable Senior Notes became convertible at the option of the Company. As of July 1, 2017, the Exchangeable Senior Notes are exchangeable at the option of the holders during the period from July 1, 2017 through September 30, 2017, after which the exchange right is subject to continuation based upon the prevailing exchange rate and the Company’s share prices during the exchange windows. As of June 30, 2017, if the Exchangeable Senior Notes were redeemed, they would be eligible for conversion into 5,258,428 of the Company’s common shares, representing a value of $156,228 based upon the Company’s closing share price of $29.71 . As of June 30, 2017, there have been no exchanges or conversions of the Exchangeable Senior Notes. As of June 30, 2017 , the Exchangeable Senior Notes have a current exchange rate of 14.3349 units of Merger consideration, where one unit of Merger consideration represents 3.1898 of the Company's common shares, or approximately 45.7255 of the Company's common shares for each $1.0 principal amount of the Exchangeable Senior Notes, representing an exchange price of $21.87 per common share of the Company. The fair value of the Exchangeable Senior Notes was determined at issuance to be $106,689 . The discount is being amortized to interest expense over the expected life of the Exchangeable Senior Notes. As of June 30, 2017 and December 31, 2016 , the Exchangeable Senior Notes were recorded as a liability at carrying value of $110,154 and $108,832 , respectively, net of unamortized discount and deferred financing costs of $4,846 and $6,168 , respectively. The fair value of the Exchangeable Senior Notes’ embedded exchange option of $11,726 was recorded in additional paid-in-capital within shareholders’ equity as of June 30, 2017 and December 31, 2016. The terms of the Company’s unsecured debt obligations and outstanding balances as of June 30, 2017 and December 31, 2016 are set forth in the table below: Stated Interest Rate Effective Interest Rate 1 Maturity Date Outstanding Balance June 30, 2017 December 31, 2016 2015 Revolving Credit Facility - Multicurrency tranche 1.02 % 1.02 % 1/8/2020 $ 70,955 $ 65,837 3-Year Term Loan 2.35 % 2.33 % 1/8/2019 300,000 300,000 5-Year Term Loan 2.35 % 2.70 % 1/8/2021 750,000 750,000 7-Year Term Loan 2.59 % 3.34 % 1/9/2023 175,000 175,000 2015 Senior Unsecured Notes 4.97 % 5.07 % 12/17/2024 150,000 150,000 2016 Senior Unsecured Notes 3.89 % 4.00 % 12/15/2022 150,000 150,000 2016 Senior Unsecured Notes 4.26 % 4.38 % 12/15/2025 100,000 100,000 2016 Senior Unsecured Notes 4.32 % 4.43 % 12/15/2026 100,000 100,000 Exchangeable Senior Notes 2 3.75 % 6.36 % 3/15/2019 115,000 115,000 Total unsecured debt 1,910,955 1,905,837 Net deferred financing costs and net debt discount (8,262 ) (9,704 ) Total unsecured debt, net $ 1,902,693 $ 1,896,133 1. Represents the rate at which interest expense is recorded for financial reporting purposes as of June 30, 2017 , which reflects the effect of interest rate swaps and amortization of financing costs and fair market value premiums or discounts. 2. During June 2017, the Exchangeable Senior Notes became convertible at the option of the Company and as of July 1, 2017, the Exchangeable Senior Notes are exchangeable at the option of the holders during the period from July 1, 2017 through September 30, 2017, after which their exchange right is subject to continuation based upon the prevailing exchange rate and the Company’s share prices during the exchange windows. Combined aggregate principal maturities of the Company’s unsecured debt obligations, non-recourse mortgages, and Exchangeable Senior Notes, in addition to associated interest payments, as of June 30, 2017 are as follows: July 1 to December 31, 2017 2018 2019 2020 2021 Thereafter Above market interest Total 2015 Revolving Credit Facility $ — $ — $ — $ 70,955 $ — $ — $ — $ 70,955 Term Loans — — 300,000 — 750,000 175,000 — 1,225,000 Mortgage Notes Payable 1 7,375 170,819 33,672 60,103 16,364 204,960 — 493,293 Senior Unsecured Notes — — — — — 500,000 — 500,000 Exchangeable Senior Notes 2 — — 115,000 — — — — 115,000 Interest Payments 3 40,357 79,689 68,482 63,968 39,247 88,910 (6,151 ) 374,502 Total $ 47,732 $ 250,508 $ 517,154 $ 195,026 $ 805,611 $ 968,870 $ (6,151 ) $ 2,778,750 1. Mortgage note payments reflect accelerated repayment dates, when applicable, pursuant to related loan agreement. 2. During June 2017, the Exchangeable Senior Notes became convertible at the option of the Company and as of July 1, 2017, the Exchangeable Senior Notes are exchangeable at the option of the holders during the period from July 1, 2017 through September 30, 2017, after which their exchange right is subject to continuation based upon the prevailing exchange rate and the Company’s share prices during the exchange windows. 3. Interest payments do not reflect the effect of interest rate swaps.

Leasing Agreements

Leasing Agreements	6 Months Ended
	Jun. 30, 2017
Leases, Operating [Abstract]
Leasing Agreements	Leasing Agreements The Company’s properties are leased to tenants under operating leases with expiration dates extending through the year 2039 . These leases generally contain rent increases and renewal options. Future minimum rental revenues under non-cancelable leases excluding reimbursements for operating expenses as of June 30, 2017 are as follows: July 1 to December 31, 2017 2018 2019 2020 2021 Thereafter Total minimum lease rental income Operating Leases $ 194,693 $ 389,118 $ 361,797 $ 332,521 $ 306,634 $ 1,581,109 $ 3,165,872

Transactions with Trustee Relat

Transactions with Trustee Related Entities and Related Parties	6 Months Ended
	Jun. 30, 2017
Related Party Transactions [Abstract]
Transactions with Trustee Related Entities and Related Parties	Transactions with Trustee Related Entities and Related Parties In December 2016, the Company sold its 5.1% interest in one property located in Lille, France held by the Goodman Europe JV to the Gramercy European Property Fund, in which the Company had a 14.2% ownership interest, for gross proceeds of $2,662 ( €2,563 ). In July 2017 , the Gramercy European Property Fund sold 100.0% of its assets to an unrelated third party. Refer to Note 17 for more information on the sale transaction. On June 30, 2016, the Company sold 74.9% of its outstanding 80.0% interest in the Goodman Europe JV to the Gramercy European Property Fund, in which the Company had a 14.2% interest as of June 30, 2017 . The Company made cumulative contributions of $55,892 ( €50,000 ) to the Gramercy European Property Fund and had a remaining funding commitment of $14,283 ( €12,500 ) as of June 30, 2017 . The Company’s CEO, who was on the board of directors, also had capital commitments to the investment, as noted below. The Company sold 74.9% of its interest in the Goodman Europe JV to the Gramercy European Property Fund for gross proceeds of $148,884 ( €134,336 ), based on third-party valuations for the underlying properties. The Company’s sale of 74.9% of its interest in the Goodman Europe JV resulted in the Company recording a gain of $5,341 during the period, primarily related to depreciation and amortization recorded since Merger closing date. Following the sale transaction, the Company had a 5.1% continuing direct interest in the Goodman Europe JV. The transaction was entered into in order to achieve efficiencies from the combination of the two European platforms. The Company’s CEO, Gordon F. DuGan, was on the board of directors of the Gramercy European Property Fund prior to its sale in July 2017 and committed and fully funded approximately $1,388 ( €1,250 ) in capital to the Gramercy European Property Fund. The two Managing Directors of Gramercy Europe Asset Management collectively committed and fully funded approximately $1,388 ( €1,250 ) in capital to the Gramercy European Property Fund. One of the properties acquired in December 2015 as part of the Merger was partially leased to Duke Realty, the Company’s partner in the Duke JV. Duke Realty acted as the managing member of the Duke JV, which was dissolved in July 2016 as described in Note 5, and as such provided asset management, construction, development, leasing and property management services, for which it was entitled to fees as well as a promoted interest. From the date of the Merger through lease expiration in May 2016, Duke Realty leased 30,777 square feet of one of the Company’s office properties located in Minnesota which had an aggregate 322,551 rentable square feet. Duke Realty paid the Company $156 and $333 under the lease for the three and six months ended June 30, 2016 , respectively. See Note 5 for more information on the Company’s transactions with the Duke JV.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements ASC 820-10, “Fair Value Measurements and Disclosures,” among other things, establishes a hierarchical disclosure framework associated with the level of pricing observability utilized in measuring financial instruments and other assets and liabilities at fair value. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date, or an exit price. The Company discloses fair value information, whether or not recognized in the financial statements, for which it is practicable to estimate that value. In cases where quoted market prices are not available, fair values are based upon the application of discount rates to estimated future cash flows based upon market yields or by using other valuation methodologies. Considerable judgment is necessary to interpret market data and develop estimated fair value. Accordingly, fair values are not necessarily indicative of the amounts the Company could realize on disposition of the financial instruments and other assets and liabilities measured at fair value. The use of different market assumptions and/or estimation methodologies may have a material effect on estimated fair value amounts. The level of pricing observability generally correlates to the degree of judgment utilized in measuring the fair value of financial instruments and other assets and liabilities. The three broad levels defined are as follows: Level I - This level is comprised of financial instruments and other assets and liabilities that have quoted prices that are available in liquid markets for identical assets or liabilities. Level II - This level is comprised of financial instruments and other assets and liabilities for which quoted prices are available but which are traded less frequently and instruments that are measured at fair value using management’s judgment, where the inputs into the determination of fair value can be directly observed. Level III - This level is comprised of financial instruments and other assets and liabilities that have little to no pricing observability as of the reported date. These financial instruments do not have active markets and are measured using management’s best estimate of fair value, where the inputs into the determination of fair value require significant management judgment and assumptions. The following table presents the carrying value in the financial statements and approximate fair value of assets and liabilities measured on a recurring and nonrecurring basis at June 30, 2017 and December 31, 2016 : June 30, 2017 December 31, 2016 Carrying Value Fair Value Carrying Value Fair Value Financial assets: Interest rate swaps $ 5,319 $ 5,319 $ 3,769 $ 3,769 Retained CDO Bonds $ 6,345 $ 6,345 $ 11,906 $ 11,906 Marketable securities 1 $ 100,114 $ 100,114 $ — $ — Investment in CBRE Strategic Partners Asia $ 3,995 $ 3,995 $ 4,145 $ 4,145 Real estate investments 2 $ 2,510 $ 2,510 $ 2,413 $ 2,413 Financial liabilities: Interest rate swaps $ 518 $ 518 $ 700 $ 700 Long-term debt 2015 Revolving Credit Facility 3 $ 70,955 $ 70,876 $ 65,837 $ 65,897 3-Year Term Loan 3 $ 300,000 $ 299,038 $ 300,000 $ 300,213 5-Year Term Loan 3 $ 750,000 $ 744,502 $ 750,000 $ 750,959 7-Year Term Loan 3 $ 175,000 $ 176,590 $ 175,000 $ 172,850 Mortgage notes payable 3 $ 495,404 $ 505,761 $ 558,642 $ 567,705 Senior Unsecured Notes 3 $ 496,584 $ 507,899 $ 496,464 $ 498,650 Exchangeable Senior Notes 3 $ 110,154 $ 117,879 $ 108,832 $ 115,625 1. Marketable securities represent the Company’s investment in U.S. treasury securities, which are classified in cash and cash equivalents on the Condensed Consolidated Balance Sheets. 2. Amounts as of June 30, 2017 and December 31, 2016 represent three and one real estate investments, respectively, that were impaired during the six months ended June 30, 2017 and the year ended December 31, 2016 , respectively, and were owned as of the end of the respective reporting periods. 3. Long-term debt instruments are classified as Level III due to the significance of unobservable inputs which are based upon management assumptions. The following methods and assumptions were used to estimate the fair value of each class of assets and liabilities for which it is practicable to estimate the value: Cash and cash equivalents, marketable securities, accrued interest, and accounts payable: These balances in the Condensed Consolidated Financial Statements reasonably approximate their fair values due to the short maturities of these items. Retained CDO Bonds: Non-investment grade, subordinate CDO bonds, preferred shares and ordinary shares are presented in other assets on the Condensed Consolidated Financial Statements at fair value, which is determined using an internally developed discounted cash flow model. CBRE Strategic Partners Asia: The investment manager of CBRE Strategic Partners Asia applies valuation techniques for the Company’s investment carried at fair value based upon the application of the income approach, the direct market comparison approach, the replacement cost approach or third-party appraisals to the underlying assets held in the unconsolidated entity in determining the net asset value attributable to the Company’s ownership interest therein. Refer to Note 5 for more information on this investment. Real estate investments: Real estate investments impaired during a period are reported at estimated fair value and real estate investments impaired during a period that are classified as held for sale as of the end of the period are reported at estimated fair value less costs to sell. Derivative instruments: The Company’s derivative instruments, which are comprised of interest rate swap agreements, are carried at fair value in the Condensed Consolidated Financial Statements based upon third-party valuations. Derivative fair values are presented within other assets or other liabilities, depending on the balance at the end of the period. Changes in fair value of derivative instruments that represent realized gains (losses) are recorded within interest expense on the Condensed Consolidated Statements of Operations. Refer to Note 10 for more information on the derivative instruments. Mortgage notes payable, unsecured term loans, unsecured revolving credit facilities and senior unsecured notes: These instruments are presented in the Condensed Consolidated Financial Statements at amortized cost and not at fair value. The fair value of each instrument is estimated by a discounted cash flows model, using discount rates that best reflect current market rates for financings with similar characteristics and credit quality. Mortgage premiums and discounts are amortized to interest expense on the Condensed Consolidated Statements of Operations using the effective interest method over the terms of the related notes. Refer to Note 6 for more information on these instruments. Exchangeable Senior Notes: The Exchangeable Senior Notes are presented at amortized cost on the Condensed Consolidated Financial Statements. The fair value is determined based upon a discounted cash-flow methodology using discount rates that best reflect current market rates for instruments with similar with characteristics and credit quality. Refer to Note 6 for more information on these instruments. Disclosure about fair value measurements is based on pertinent information available to the Company at the reporting date. Although the Company is not aware of any factors that would significantly affect the reasonable fair value amounts, such amounts have not been comprehensively revalued for the purpose of these financial statements since June 30, 2017 and December 31, 2016 , and current estimates of fair value may differ significantly from the amounts presented herein. The following discussion of fair value was determined by the Company using available market information and appropriate valuation methodologies. Considerable judgment is necessary to interpret market data and develop estimated fair value. Accordingly, fair values are not necessarily indicative of the amounts the Company could realize on disposition of the assets or liabilities. Determining which category an asset or liability falls within the hierarchy requires significant judgment and the Company evaluates its hierarchy disclosures each quarter. Assets and liabilities measured at fair value on a recurring basis and on a non-recurring basis are categorized in the table below based upon the lowest level of significant input to the valuations. At June 30, 2017 Total Level I Level II Level III Financial Assets: Retained CDO Bonds $ 6,345 $ — $ — $ 6,345 Marketable Securities 100,114 100,114 — — Real estate investments 2,510 — — 2,510 Investment in CBRE Strategic Partners Asia 3,995 — — 3,995 Interest rate swaps 5,319 — — 5,319 $ 118,283 $ 100,114 $ — $ 18,169 Financial Liabilities: Interest rate swaps $ (518 ) $ — $ — $ (518 ) $ (518 ) $ — $ — $ (518 ) At December 31, 2016 Total Level I Level II Level III Financial Assets: Retained CDO Bonds $ 11,906 $ — $ — $ 11,906 Real estate investments 2,413 — — 2,413 Investment in CBRE Strategic Partners Asia 4,145 — — 4,145 Interest rate swaps 3,769 — — 3,769 $ 22,233 $ — $ — $ 22,233 Financial Liabilities: Interest rate swaps $ (700 ) $ — $ — $ (700 ) $ (700 ) $ — $ — $ (700 ) Valuation of Level III Instruments Retained CDO Bonds: Retained CDO Bonds are valued on a recurring basis using an internally developed discounted cash flow model. Management estimates the timing and amount of cash flows expected to be collected and applies a discount rate equal to the yield that the Company would expect to pay for similar securities with similar risks at the valuation date. Future expected cash flows generated by management require significant assumptions and judgment regarding the expected resolution of the underlying collateral, which primarily consists of commercial mortgage backed securities. The resolution of the underlying collateral requires further management assumptions regarding timing of workouts and recoveries, loan loss severities and other factors. The models are most sensitive to the unobservable inputs such as the amount of the recoveries of the underlying securities. Significant increases (decreases) in any of those inputs in isolation as well as any change in the expected timing of those inputs would result in a significantly lower (higher) fair value measurement. Due to the inherent uncertainty in the determination of fair value, the Company has designated its Retained CDO Bonds as Level III. Investment in CBRE Strategic Partners Asia: The Company’s investment in CBRE Strategic Partners Asia is based on the Level III valuation inputs applied by the investment manager of CBRE Strategic Partners Asia, utilizing a mix of different approaches for valuing the underlying real estate related investments within the investment company. The approaches include the income approach, direct market comparison approach and the replacement cost approach for newer properties. For investments owned more than one year, except for investments under construction or incurring significant renovation, CBRE Strategic Partners Asia obtains a third-party appraisal. For investments in real estate under construction or incurring significant renovation, the valuation analysis is prepared by the investment manager of CBRE Strategic Partners Asia. The valuations are most sensitive to the unobservable inputs of discount rates, as well as capitalization rates an expected future cash flows, and significant increases (decreases) in these inputs would result in a significantly lower (higher) fair value measurement. The fund’s term ended in January 2017 and commencement of the fund's liquidation was filed in early February 2017. The fund will wind up over the succeeding 24 months. Real estate investments: Real estate investments impaired during a period are reported at estimated fair value and real estate investments impaired during a period that are classified as held for sale as of the end of the period are reported at estimated fair value less costs to sell. The fair value of real estate investments and their related lease intangibles is determined using third-party valuation support, including purchase-sale contracts and other available market information. Key assumptions in the valuations, to which the fair value determinations are most sensitive, include discount and capitalization rates as well as expected future cash flows. Significant increases (decreases) in these inputs would result in a significantly lower (higher) fair value measurement. As the inputs are unobservable, the Company determined the inputs used to value this liability falls within Level III for fair value reporting. Derivative instruments: Interest rate swaps are valued with the assistance of a third-party derivative specialist using a discounted cash flow model, which requires a combination of observable market-based inputs, such as interest rate curves, and unobservable inputs which require significant judgment such as the credit valuation adjustments due to the risk of nonperformance by both the Company and its counterparties. The most significant unobservable input in the fair valuation of derivative instruments is the credit valuation adjustment as it requires significant management judgment regarding changes in the credit risk of the Company or its counterparties, however the primary driver of the fair value of the interest rate swaps is the forward interest rate curve. Total unrealized gains (losses) from derivatives for the three and six months ended June 30, 2017 were $(2,692) and $1,686 , respectively, in accumulated other comprehensive income. Total unrealized losses from derivatives for the three and six months ended June 30, 2016 were $11,460 and $33,649 , respectively, in accumulated other comprehensive income. Fair Value on a Recurring Basis Quantitative information regarding the valuation techniques and the range of significant unobservable Level III inputs used to determine fair value measurements on a recurring basis as of June 30, 2017 are as follows: Financial Asset (Liability) Fair Value Valuation Technique Unobservable Inputs Range Non-investment grade, subordinate CDO bonds $ 6,345 Discounted cash flows Discount rate 16.5% Interest rate swaps 1 $ 4,801 Hypothetical derivative method Credit borrowing spread 135 to 210 basis points Investment in CBRE Strategic Partners Asia $ 3,995 Discounted cash flows Discount rate 20.0% 1. Fair value includes interest rate swap liabilities with an aggregate value of $(518) . The following rollforward table reconciles the beginning and ending balances of financial assets (liabilities) measured at fair value on a recurring basis using Level III inputs as of June 30, 2017 : Retained CDO Bonds Investment in CBRE Strategic Partners Asia Interest Rate Swaps Total Financial Assets (Liabilities) - Level III Balance at January 1, 2017 $ 11,906 $ 4,145 $ 3,069 $ 19,120 Amortization of discounts or premiums 898 — — 898 Adjustments to fair value: Ineffective portion of change in derivative instruments — — 46 46 Unrealized gain on derivatives — — 1,686 1,686 Unrealized loss in other comprehensive income from fair value adjustment (1,569 ) — — (1,569 ) Other-than-temporary impairments (4,890 ) — — (4,890 ) Total loss on fair value adjustments — (150 ) — (150 ) Balance at June 30, 2017 $ 6,345 $ 3,995 $ 4,801 $ 15,141 Fair Value on a Non-Recurring Basis The Company measured its real estate investments impaired during the period, including both assets classified as held for sale and assets held for investment, on a non-recurring basis as of June 30, 2017 and December 31, 2016 . The Company recorded impairment on these assets as a result of a change in intent to hold the real estate investments. Real estate investments impaired during the period are reported at estimated fair value and real estate investments impaired during the period that are classified as held for sale as of the end of the period are reported at estimated fair value less costs to sell. The Company measured three assets on a non-recurring basis as of June 30, 2017 , of which two were classified as held for investment with a total value of $2,138 and one was classified as held for sale with a value of $372 as of June 30, 2017 . The Company measured one asset on a non-recurring basis as of December 31, 2016 , which was classified as held for sale and recorded at $2,413 as of December 31, 2016 .

Derivatives and Non-Derivative

Derivatives and Non-Derivative Hedging Instruments	6 Months Ended
	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Non-Derivative Hedging Instruments	Derivatives and Non-Derivative Hedging Instruments In the normal course of business, the Company is exposed to the effect of interest rate changes and foreign exchange rate changes. The Company limits these risks by following established risk management policies and procedures including the use of derivatives and net investment hedges. The Company uses a variety of derivative instruments to manage, or hedge, interest rate risk. The Company enters into hedging and derivative instruments that will be maximally effective in reducing the interest rate risk and foreign currency exchange rate risk exposure that they are designated to hedge. This effectiveness is essential for qualifying for hedge accounting. Instruments that meet these hedging criteria are formally designated as hedges at the inception of the derivative contract. The Company uses a variety of commonly used derivative products that are considered “plain vanilla” derivatives. These derivatives typically include interest rate swaps, caps, collars and floors. The Company expressly prohibits the use of unconventional derivative instruments and using derivative instruments for trading or speculative purposes. Further, the Company has a policy of only entering into contracts with major financial institutions based upon their credit ratings and other factors. The Company recognizes all derivatives on the Condensed Consolidated Balance Sheets at fair value within other assets or other liabilities, depending on the balance at the end of the period. Derivatives that are not designated as hedges must be adjusted to fair value through income. If a derivative is a hedge, depending on the nature of the hedge, changes in the fair value of the derivative will either be offset against the change in fair value of the hedged asset, liability or firm commitment through earnings, or recognized in other comprehensive income until the hedged item is recognized in earnings. The ineffective portion of a derivative’s change in fair value will be immediately recognized in earnings. Derivative accounting may increase or decrease reported net income and shareholders’ equity prospectively, depending on future levels of the LIBOR swap spreads and other variables affecting the fair values of derivative instruments and hedged items, but will have no effect on cash flows, provided the contract is carried through to full term. Refer to Note 9 for additional information on the Company's derivative instruments, including the fair value measurement of these instruments. Borrowings on the Company’s multicurrency tranche of the 2015 Revolving Credit Facility, which are designated as non-derivative net investment hedges, are recognized at par value based on the exchange rate in effect on the date of the draw. Subsequent changes in the exchange rate of the Company’s non-derivative net investment hedge are recognized as part of the cumulative foreign currency translation adjustment within other comprehensive income. The Company’s derivatives and hedging instruments as of June 30, 2017 are as follows: Benchmark Rate Notional Value Strike Rate Effective Date Expiration Date Fair Value Interest Rate Swap - Waco 1 mo. USD-LIBOR-BBA 15,038 USD 4.55% 12/19/2013 12/19/2020 $ (358 ) Interest Rate Swap - Atrium I 1 mo. USD-LIBOR-BBA 19,240 USD 1.78% 8/16/2011 5/31/2018 (108 ) Interest Rate Swap - Easton III 1 mo. USD-LIBOR-BBA 5,815 USD 1.95% 8/16/2011 1/31/2019 (52 ) Interest Rate Swap - 3-Year Term Loan 1 mo. USD-LIBOR-BBA 100,000 USD 1.22% 12/19/2016 12/17/2018 366 Interest Rate Swap - 3-Year Term Loan 1 mo. USD-LIBOR-BBA 100,000 USD 1.23% 12/19/2016 12/17/2018 360 Interest Rate Swap - 3-Year Term Loan 1 mo. USD-LIBOR-BBA 100,000 USD 1.24% 12/19/2016 12/17/2018 344 Interest Rate Swap - 5-Year Term Loan 1 mo. USD-LIBOR-BBA 750,000 USD 1.60% 12/17/2015 12/17/2020 3,566 Interest Rate Swap - 7-Year Term Loan 1 mo. USD-LIBOR-BBA 175,000 USD 1.82% 12/17/2015 1/9/2023 683 Net Investment Hedge in EUR-denominated investments USD-EUR exchange rate 45,000 EUR N/A 9/28/2015 N/A — Net Investment Hedge in GBP-denominated investments USD-GBP exchange rate 15,000 GBP N/A 7/15/2016 N/A — Total hedging instruments $ 4,801 As of June 30, 2017 , the Company’s derivative instruments consist of interest rate swaps, which are cash flow hedges. Through its interest rate swaps, the Company is hedging exposure to variability in future interest payments on its debt facilities. At June 30, 2017 , the Company's interest rate swap derivative instruments were reported in other assets at fair value of $5,319 and in other liabilities at fair value of $(518) . Swap gain (loss) is recognized in interest expense in the Condensed Consolidated Statements of Operations and represents interest rate swap hedge ineffectiveness, or amounts excluded from ineffectiveness, which relates to the off-market financing element associated with certain derivatives. Swap gain of $0 and $46 was recognized for the three and six months ended June 30, 2017 , respectively, and swap gain of $2,564 and $734 was recognized for the three and six months ended June 30, 2016 , respectively. During the three and six months ended June 30, 2017 , the Company reclassified $271 and $539 , respectively, from accumulated other comprehensive income into interest expense related to a derivative terminated in 2015. During the three and six months ended June 30, 2016 , the Company reclassified $271 and $631 , respectively, from accumulated other comprehensive income into interest expense related to a derivative terminated in 2015. Over time, the realized and unrealized gains and losses held in accumulated other comprehensive income will be reclassified into earnings in the same periods in which the hedged interest payments affect earnings. During the next 12 months, the Company expects that $1,911 will be reclassified from other comprehensive income as an increase in interest expense for the Company’s interest rate swaps as of June 30, 2017 . Additionally, the Company will recognize $2,111 in interest expense on a straight-line basis over the remaining original term of terminated swaps through June 2019, representing amortization of the remaining accumulated other comprehensive income balance related to the swap, and of this amount $1,087 will be recognized in interest expense during the next 12 months. The Company hedges its investments based in foreign currencies using non-derivative net investment hedges in conjunction with borrowings under the multicurrency tranche of its 2015 Revolving Credit Facility. The Company’s non-derivative net investment hedge on its euro-denominated investments, which was entered into in September 2015, is used to hedge exposure to changes in the euro U.S. dollar exchange rate underlying its unconsolidated equity investments in the Gramercy European Property Fund and the Goodman Europe JV, both of which have euros as their functional currency. The Company’s non-derivative net investment hedge on its British pound sterling-denominated investments, which was entered into in July 2016, is used to hedge exposure to changes in the British pound sterling U.S. dollar exchange rate underlying its unconsolidated equity investment in the Goodman UK JV and its wholly-owned property in Coventry, UK until its disposition in December 2016, both of which have British pounds sterling as their functional currency. At June 30, 2017 , the non-derivative net investment hedge value is reported at carrying value as a net liability of $70,955 , which is included in the balance of the senior unsecured revolving credit facility on the Condensed Consolidated Balance Sheets. During the three and six months ended June 30, 2017 , the Company recorded a net loss of $4,196 and $5,119 , respectively, in other comprehensive income from the impact of exchange rates related to the non-derivative net investment hedges. During the three and six months ended June 30, 2016 , the Company recorded a net gain (loss) of $970 and $(66) , respectively, in other comprehensive income from the impact of exchange rates related to the non-derivative net investment hedges. When the non-derivative net investments being hedged are sold or substantially liquidated, the balance of the translation adjustment accumulated in other comprehensive income will be reclassified into earnings.

Shareholders' Equity (Deficit)

Shareholders' Equity (Deficit) of the Company	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Shareholders' Equity (Deficit) of the Company	Shareholders’ Equity (Deficit) of the Company As of June 30, 2017 and December 31, 2016 , the Company's authorized capital shares consists of 500,000,000 shares of beneficial interest, $0.01 par value per share, of which the Company is authorized to issue up to 490,000,000 common shares of beneficial interest, $0.01 par value per share, or common shares, and 10,000,000 preferred shares of beneficial interest, $0.01 par value per share, or preferred shares. As of June 30, 2017 , 151,889,880 common shares and 3,500,000 preferred shares were issued and outstanding. During the six months ended June 30, 2017 , the Company’s common dividends are as follows: Quarter Ended Record Date Payment Date Common dividend per share March 31, 2017 3/31/2017 4/14/2017 $0.375 June 30, 2017 6/30/2017 7/14/2017 $0.375 In April 2017, the Company completed an underwritten public offering of 10,350,000 common shares, which includes the exercise in full by the underwriters of their option to purchase 1,350,000 additional common shares. The common shares were issued at a public offering price of $27.60 per share and the net proceeds from the offering were approximately $274,234 . In December 2016, the Company's board of trustees approved a 1-for-3 reverse share split of its common shares and outstanding OP Units. The reverse share split was effective after the close of trading on December 30, 2016 and the Company's common shares began trading on a reverse-split-adjusted basis on the NYSE on January 3, 2017. Employee Stock Purchase Plan In June 2017, the Company’s shareholders approved an Employee Stock Purchase Plan, or ESPP, which enables the Company’s eligible employees to purchase the common shares through payroll deductions. The ESPP has a maximum of 250,000 common shares available for issuance and provides for eligible employees to purchase the common shares during defined offer periods at a purchase price determined at the discretion of the board of trustees equal to either (1) a fixed percentage (not less than 85.0% ) of the fair market value of the common shares on the exercise date or (2) the lesser of (A) a fixed percentage (not less than 85.0% ) of the fair market value of the common shares on the exercise date and (B) a fixed percentage (not less than 85.0% ) of the fair market value of the common shares on the first day of the offer period. Dividend Reinvestment Plan In June 2016, the Company adopted a dividend reinvestment plan, or DRIP, under which shareholders may use their dividends and optional cash payments to purchase additional common shares of the Company. In August 2016, the Company registered 3,333,333 common shares related to the DRIP. During the six months ended June 30, 2017 , 3,802 shares were issued under the DRIP and as of June 30, 2017 there were 3,328,834 shares available for issuance under the DRIP. Share Repurchase Program In February 2016, the Company’s board of trustees approved a share repurchase program authorizing the Company to repurchase up to $100,000 of the Company’s outstanding common shares. As of June 30, 2017 , the Company had not repurchased any shares under the share repurchase program. At-The-Market Equity Offering Program In July 2016, the Company’s board of trustees approved the establishment of an “at the market” equity issuance program, or ATM Program, pursuant to which the Company may offer and sell common shares with an aggregate gross sales price of up to $375,000 . During the three months ended June 30, 2017 , the Company did no t sell any common shares through the ATM Program and during the six months ended June 30, 2017 , the Company sold 731,453 common shares through the ATM Program for net proceeds of approximately $19,700 . Preferred Shares Holders of the Company's 7.125% Series A Preferred Shares, or Series A Preferred Shares, are entitled to receive annual dividends of $1.78125 per share on a quarterly basis and dividends are cumulative, subject to certain provisions. On or after August 15, 2019, the Company can, at its option, redeem the Series A Preferred Shares at par for cash. At June 30, 2017 , the Company had 3,500,000 of its Series A Preferred Shares outstanding with a mandatory liquidation preference of $25.00 per share. Equity Incentive Plans In June 2016, the Company instituted its 2016 Equity Incentive Plan, which was approved by the Company’s board of trustees and shareholders. As of June 30, 2017 , there were 3,336,525 shares available for grant under the 2016 Equity Incentive Plan. The Company accounts for share-based compensation awards using fair value recognition provisions and assumes an estimated forfeiture rate which impacts the amount of compensation cost recognized over the benefit period. Through June 30, 2017 , 908,985 restricted shares had been issued under the Company’s equity incentive plans, including the 2016 Equity Incentive Plan and the Company’s previous equity incentive plans, of which 73.1% have vested. As of June 30, 2017 and December 31, 2016 , the Company had 354,136 and 318,807 weighted average restricted shares outstanding, respectively. Compensation expense of $755 and $1,572 was recorded for the three and six months ended June 30, 2017 , respectively, related to the Company’s equity incentive plans. Compensation expense of $604 and $1,087 was recorded for the three and six months ended June 30, 2016 , respectively, related to the Company’s equity incentive plans. Compensation expense of $5,089 will be recorded over the course of the next 33 months representing the remaining weighted average vesting period of equity awards issued under the equity incentive plans as of June 30, 2017 . Compensation expense of $1,070 and $2,126 was recorded for the three and six months ended June 30, 2017 , respectively, for the Company's Outperformance Plans. Compensation expense of $488 and $976 was recorded for the three and six months ended June 30, 2016 , respectively, for the Company's Outperformance Plans. Compensation expense of $5,896 will be recorded over the course of the next 37 months , representing the remaining weighted average vesting period of the awards issued under the Outperformance Plans as of June 30, 2017 . Earnings per Share The Company presents both basic and diluted earnings per share, or EPS. Basic EPS is computed by dividing net income available to common shareholders, as adjusted for unallocated earnings attributable to certain participating securities, if any, by the weighted average number of common shares outstanding during the period. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common shares were exercised or converted into common shares, as long as their inclusion would not be anti-dilutive. The two-class method is an earnings allocation methodology that determines EPS for common shares and participating securities according to dividends declared or accumulated and participation rights in undistributed earnings. The Company has certain share-based payment awards that contain nonforfeitable rights to dividends, which are considered participating securities for the purposes of computing EPS pursuant to the two-class method, and therefore the Company applies the two-class method in its computation of EPS. Earnings per share for the three and six months ended June 30, 2017 and 2016 are computed as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Numerator – Income (loss): Net income (loss) from continuing operations $ 5,985 $ 23,565 $ (2,087 ) $ 17,872 Net income (loss) from discontinued operations (28 ) 58 (52 ) 4,698 Net income (loss) before net gain on disposals 5,957 23,623 (2,139 ) 22,570 Net gain on disposals 2,002 — 19,379 — Gain on sale of European unconsolidated equity investment interests held with a related party — 5,341 — 5,341 Net income 7,959 28,964 17,240 27,911 Less: Net (income) loss attributable to noncontrolling interest 113 (51 ) (41 ) 69 Less: Nonforfeitable dividends allocated to participating shareholders (337 ) (201 ) (635 ) (400 ) Less: Preferred share dividends (1,558 ) (1,558 ) (3,117 ) (3,117 ) Net income available to common shares outstanding $ 6,177 $ 27,154 $ 13,447 $ 24,463 Denominator – Weighted average shares 1 : Basic weighted average shares outstanding 148,542,916 140,776,976 144,746,251 140,664,885 Effect of dilutive securities: Unvested non-participating share based payment awards 86,452 604,464 79,552 604,464 Options 19,196 14,539 14,471 10,392 Outside interests in the Operating Partnership — 402,769 — 430,435 Exchangeable Senior Notes 1,265,879 715,454 1,125,662 378,414 Diluted weighted average shares outstanding 149,914,443 142,514,202 145,965,936 142,088,590 1. Share and per share amounts have been adjusted for the 1-for-3 reverse share split completed on December 30, 2016. The Company’s options and other share-based payment awards used in the computation of EPS were calculated using the treasury share method. The Company only includes the effect of the excess conversion premium in the calculation of Diluted EPS, as the Company has the intent and ability to settle the debt component of the Exchangeable Senior Notes in cash and the excess conversion premium in shares. The weighted average price of the Company’s common shares as of June 30, 2017 and 2016 was above the exchange price of the Exchangeable Senior Notes as of June 30, 2017 and 2016 , respectively, and the Company had net income available to common shares outstanding during the periods, therefore, the potential dilutive effect of the excess conversion premium was included in the calculation of Diluted EPS for the periods. For the three and six months ended June 30, 2017 , the net income (loss) attributable to the outside interests in the Operating Partnership has been excluded from the numerator and 560,443 and 590,547 , respectively, of weighted average shares related to the outside interests in the Operating Partnership has been excluded from the denominator for the purpose of calculating Diluted EPS as there would have been no effect had such amounts been included. Refer to Note 13 for more information on the outside interests in the Operating Partnership. Accumulated other comprehensive income (loss) Accumulated other comprehensive income (loss) as of June 30, 2017 and December 31, 2016 is comprised of the following: June 30, 2017 December 31, 2016 Net unrealized gain (loss) on derivative securities $ 1,246 $ (440 ) Net unrealized gain on debt instruments 2,130 3,699 Foreign currency translation adjustments: Net gain (loss) on non-derivative net investment hedges 1 (603 ) 4,516 Other foreign currency translation adjustments (6,109 ) (13,045 ) Reclassification of swap gain into interest expense 1,681 1,142 Total accumulated other comprehensive loss $ (1,655 ) $ (4,128 ) 1. The foreign currency translation adjustment associated with the Company’s non-derivative net investment hedges related to its European investments is included in other comprehensive income (loss). The balance reflects a $652 write-off on the Company’s non-derivative net investment hedge during the year ended December 31, 2016.

Partners' Capital of the Operat

Partners' Capital of the Operating Partnership	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Partners' Capital of the Operating Partnership	Partners’ Capital of the Operating Partnership The Company is the sole general partner of the Operating Partnership. As of June 30, 2017 , the Company owned 151,517,008 of the outstanding general and limited partnership interests, or 99.64% , of the Operating Partnership. The number of common units in the Operating Partnership is equivalent to the number of outstanding common shares of the Company, and the entitlement of all the Operating Partnership’s common units to quarterly distributions and payments in liquidation are substantially the same as those of the Company's common shareholders. Similarly, in the case of each series of preferred units in the Operating Partnership held by the Company, there is a series of preferred shares that is equivalent in number and carries substantially the same terms as such series of the Operating Partnership’s preferred units. Limited Partner Units As of June 30, 2017 , limited partners other than the Company owned 545,589 common units, or 0.36% , of the Operating Partnership. Earnings per Unit The Operating Partnership's earnings per unit for the three and six months ended June 30, 2017 and 2016 are computed as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Numerator – Income (loss): Net income (loss) from continuing operations $ 5,985 $ 23,565 $ (2,087 ) $ 17,872 Net income (loss) from discontinued operations (28 ) 58 (52 ) 4,698 Net income (loss) before net gain on disposals 5,957 23,623 (2,139 ) 22,570 Net gain on disposals 2,002 — 19,379 — Gain on sale of European unconsolidated equity investment interests held with a related party — 5,341 — 5,341 Net income 7,959 28,964 17,240 27,911 Less: Net loss attributable to noncontrolling interest in other partnerships 137 27 17 139 Less: Nonforfeitable dividends allocated to participating unitholders (337 ) (201 ) (635 ) (400 ) Less: Preferred unit distributions (1,558 ) (1,558 ) (3,117 ) (3,117 ) Net income available to common units outstanding $ 6,201 $ 27,232 $ 13,505 $ 24,533 Denominator – Weighted average units 1 : Basic weighted average units outstanding 149,103,359 141,179,745 145,336,798 141,095,320 Effect of dilutive securities: Unvested non-participating share based payment awards 86,452 604,464 79,552 604,464 Options 19,196 14,539 14,471 10,392 Exchangeable Senior Notes 1,265,879 715,454 1,125,662 378,414 Diluted weighted average units outstanding 150,474,886 142,514,202 146,556,483 142,088,590 1. Share and per share amounts have been adjusted for the 1-for-3 reverse unit split completed on December 30, 2016.

Noncontrolling Interests

Noncontrolling Interests	6 Months Ended
	Jun. 30, 2017
Noncontrolling Interest [Abstract]
Noncontrolling Interests	Noncontrolling Interests Noncontrolling interests represent the outside equity interests in the Operating Partnership as well as third-party equity interests in the Company’s other consolidated subsidiaries. Outside equity interests in Operating Partnership The outside equity interests in the Operating Partnership include common units of limited partnership interest in the Operating Partnership, or OP Units, and the earned and vested portion of limited partnership interests in the Operating Partnership granted by the Company pursuant to its share-based compensation plans, or LTIP Units, which are convertible on a one-for-one basis into OP Units. The aggregate outstanding noncontrolling interest in the Operating Partnership as of June 30, 2017 represented an interest of approximately 0.36% in the Operating Partnership. A portion of the Operating Partnership’s net income (loss) during each reporting period is attributed to noncontrolling interests based on the weighted average percentage ownership of both OP Unit holders and earned and vested LTIP Unit holders relative to the sum of the Company’s total outstanding common shares, OP Units, and earned and vested LTIP Units. OP Units As of June 30, 2017 , 215,830 OP Units were outstanding, which can be redeemed for 215,830 of the Company's shares. During the six months ended June 30, 2017 and the year ended December 31, 2016, 98,009 and 156,452 OP Units, respectively, were converted on a one-for-one basis into common shares of the Company. At June 30, 2017 , 215,830 common shares of the Company were reserved for issuance upon redemption of LTIP Units. OP Units are recorded at the greater of cost basis or fair market value based on the closing share price of the Company’s common shares at the end of the reporting period. As of June 30, 2017 , the value of the OP units was $6,412 . LTIP Units As of June 30, 2017 , noncontrolling interest owners held 329,759 earned and vested LTIP Units, which, upon conversion into OP Units, can be redeemed for 329,759 of the Company’s common shares. During the six months ended June 30, 2017 and year ended December 31, 2016, there were no earned and vested LTIP Units converted into OP Units or redeemed for common shares of the Company. At June 30, 2017 , 329,759 common shares of the Company were reserved for issuance upon conversion of the earned and vested LTIP Units into OP Units and their subsequent redemption for common shares. Below is the rollforward of the activity relating to the noncontrolling interests in the Operating Partnership as of June 30, 2017 : Noncontrolling Interest Balance at January 1, 2017 $ 8,643 Redemption of noncontrolling interests in the Operating Partnership (2,697 ) Net income attribution 58 Fair value adjustments 576 Dividends (168 ) Balance at June 30, 2017 $ 6,412 Interests in Other Operating Partnerships In connection with the Company’s December 2014 investment in the Gramercy European Property Fund, the Company acquired a 50.0% equity interest in European Fund Manager, which provides investment and asset management services to the Gramercy European Property Fund. European Fund Manager is a consolidated VIE of the Company and is consolidated into its Condensed Consolidated Financial Statements. Refer to Note 2 for further discussion of the VIE and consolidation considerations. As of June 30, 2017 and December 31, 2016 , the value of the Company’s interest in European Fund Manager was $(363) and $(321) , respectively. The Company’s interest in European Fund Manager is presented in the equity section of its Condensed Consolidated Balance Sheets.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Funding Commitments During March 2017, construction was completed on the Company’s build-to-suit property in Round Rock, Texas, which the Company acquired upon completion for $29,605 . As of June 30, 2017 , the Company is obligated to fund the development of three build-to-suit industrial properties, for which it has remaining cumulative future commitments of $57,199 . As of June 30, 2017 and December 31, 2016 , the Company made cumulative contributions to the Gramercy European Property Fund of $55,892 ( €50,000 ). As of June 30, 2017 , the Company’s remaining commitment to the Gramercy European Property Fund was $14,283 ( €12,500 ), however in July 2017, the Gramercy European Property Fund sold 100.0% of its assets to a third party. Foreign currency commitments have been converted into U.S. dollars based on (i) the foreign exchange rate at the closing date for completed transactions and (ii) the exchange rate that prevailed on June 30, 2017 , in the case of unfunded commitments. The Company has committed to fund $100,000 to Strategic Office Partners, of which $23,427 and $16,027 was funded as of June 30, 2017 and December 31, 2016, respectively. See Note 5 for further information on the Gramercy European Property Fund and Strategic Office Partners. Legal Proceedings The Company evaluates litigation contingencies based on information currently available, including the advice of counsel and the assessment of available insurance coverage. The Company will establish accruals for litigation and claims when a loss contingency is considered probable and the related amount is reasonably estimable. The Company will periodically review these contingencies which may be adjusted if circumstances change. The outcome of a litigation matter and the amount or range of potential losses at particular points may be difficult to ascertain. If a range of loss is estimated and an amount within such range appears to be a better estimate than any other amount within that range, then that amount is accrued. Legacy Gramercy, its board of directors, and Chambers were named as defendants in various putative class action lawsuits brought by purported Legacy Gramercy stockholders challenging the Merger. The lawsuits were consolidated into a New York state court action, or the New York Action, and a Maryland state court action, or the Maryland Action. On March 1, 2017, the court entered a Final Order and Judgment approving the settlement, awarding plaintiffs’ attorney fees and expenses, and dismissing the New York Action with prejudice. On March 22, 2017, pursuant to the stipulation of settlement, plaintiffs in the Maryland Action filed a notice of dismissal with prejudice with the Circuit Court for Baltimore County, Maryland, which the court entered on April 11, 2017. In connection with the Company’s property acquisitions and the Merger, the Company has determined that there is a risk it will have to pay future amounts to tenants related to continuing operating expense reimbursement audits. In 2017, the Company settled the majority of its operating expense reimbursement audits and paid $3,500 pursuant to the settlement in February 2017. As of June 30, 2017 , the Company has estimated a range of loss of $0 to $360 and determined that its best estimate of total loss is $360 , which is related to the Merger and has been accrued and recorded in other liabilities as of June 30, 2017 and December 31, 2016 . In addition, the Company and/or one or more of its subsidiaries is party to various litigation matters that are considered routine litigation incidental to its business, none of which are considered material. Office Leases The Company has several office locations, which are each subject to operating lease agreements. These office locations include the Company’s corporate office at 90 Park Avenue, New York, New York, and the Company’s seven regional offices located across the United States and Europe. Capital and Operating Ground Leases Certain properties acquired are subject to ground leases, which are accounted for as operating and capital leases, as applicable. The ground leases have varying ending dates, renewal options and rental rate escalations, with the latest lease extending to June 2053 . Future minimum rental payments to be made by the Company under these non-cancelable ground leases, excluding increases resulting from increases in the consumer price index, are as follows: July 1 to December 31, 2017 2018 2019 2020 2021 Thereafter Total Ground Leases - Operating $ 1,123 $ 2,262 $ 2,271 $ 2,263 $ 2,231 $ 61,857 $ 72,007 Ground Leases - Capital — 1 — — — 329 330 Total $ 1,123 $ 2,263 $ 2,271 $ 2,263 $ 2,231 $ 62,186 $ 72,337

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company has elected to be taxed as a REIT, under Sections 856 through 860 of the Internal Revenue Code beginning with its taxable year ended December 31, 2004. To qualify as a REIT, the Company must meet certain organizational and operational requirements, including a requirement to distribute annually at least 90.0% of its ordinary taxable income to its shareholders. As a REIT, the Company generally will not be subject to U.S. federal income tax on taxable income that it distributes to its shareholders. The Operating Partnership is a limited partnership and therefore is generally not liable for federal corporate income taxes as income is reported in the tax returns of its partners. The Operating Partnership may, however, be subject to certain state and local taxes. The Operating Partnership has in the past established taxable REIT subsidiaries, or TRSs, to effect various taxable transactions. Typical transactions that could cause these TRSs to be subject to federal, state and local taxes would include, but are not limited to, gains on property sales and management fee income. The asset management agreement with KBS expired on March 31, 2017 and, consequently, the tax expense from the Operating Partnership’s TRS for the three and six months ended June 30, 2017 was immaterial and the activity in the TRS will be immaterial going forward. Prior to 2017, income taxes, primarily related to TRSs, were accounted for under the asset and liability method. Deferred tax assets and liabilities were recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities recorded in accordance with GAAP and their respective tax basis and operating loss carryforwards. Deferred tax assets and liabilities were measured using enacted tax rates in effect for the year in which those temporary differences were expected to be recovered or settled. A valuation allowance was provided if the Company believed it was more likely than not that all or a portion of a deferred tax asset would not be realized. Any increase or decrease in a valuation allowance was included in the tax provision when such a change occurs. For the three and six months ended June 30, 2017 the Company recorded $147 and ( $49 ) of income tax expense (benefit), respectively. The Company’s policy for interest and penalties, if any, on material uncertain tax positions recognized in the financial statements is to classify these as interest expense and operating expense, respectively. As of June 30, 2017 and December 31, 2016, the Company did not incur any material interest or penalties.

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	6 Months Ended
	Jun. 30, 2017
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Information	Supplemental Cash Flow Information The following table represents supplemental cash flow disclosures for the six months ended June 30, 2017 and 2016 : Six Months Ended June 30, 2017 2016 Supplemental cash flow disclosures: Interest paid $ 44,441 $ 40,639 Income taxes paid $ 296 $ 743 Proceeds from 1031 exchanges from sale of real estate $ 170,210 $ 270,429 Use of funds from 1031 exchanges for acquisitions of real estate $ (140,987 ) $ (227,521 ) Non-cash activity: Fair value adjustment to noncontrolling interest in the Operating Partnership $ 576 $ 2,159 Debt assumed in acquisition of real estate $ 3,680 $ 45,958 Debt transferred in disposition of real estate $ (10,456 ) $ (101,432 ) Non-cash acquisition of consolidated VIE $ 24,930 $ — Dividend reinvestment plan proceeds $ 103 $ — Distribution of real estate assets from unconsolidated equity investment $ — $ 263,015 Redemption of units of noncontrolling interest in the Operating Partnership for common shares $ (2,697 ) $ (2,204 )

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events In July 2017, the Gramercy European Property Fund sold 100.0% of its assets to a third party. The transaction resulted in net distributions to the Company of approximately $103,802 ( €90,848 ), inclusive of a promoted interest distribution of approximately $8,987 ( €7,865 ). In August 2017, the Company declared a third quarter 2017 common dividend of $0.375 per share, payable on October 16, 2017 to shareholders of record as of September 29, 2017. In August 2017, the Company also declared a third quarter 2017 dividend on its 7.125% Series A Preferred Shares in the amount of $0.44531 per share, payable on October 2, 2017 to preferred shareholders of record as of the close of business on September 20, 2017. Subsequent to June 30, 2017, the Company closed on the acquisition of five industrial properties which comprise an aggregate 4,012,362 rentable square feet, including three covered land industrial parcels, which are 100.0% occupied and were acquired for an aggregate purchase price of approximately $148,765 . Subsequent to June 30, 2017, the Company closed on the disposition of five office properties and one industrial property which comprised an aggregate 95,026 rentable square feet for gross proceeds of approximately $16,355 .

Significant Accounting Polici26

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Reclassifications	Reclassifications Certain prior year balances have been reclassified to conform with the current year presentation. These reclassifications had no effect on the previously reported net income. On the Condensed Consolidated Statements of Operations, the Company reclassified investment income of $503 and $946 for the three and six months ended June 30, 2016, respectively, into other income.
Principles of Consolidation	Principles of Consolidation The Condensed Consolidated Financial Statements include the Company’s accounts and those of the Company’s subsidiaries which are wholly-owned or controlled by the Company, or entities which are VIEs in which the Company is the primary beneficiary. The primary beneficiary is the party that absorbs a majority of the VIE’s anticipated losses and/or a majority of the expected returns. The Company has evaluated its investments for potential classification as variable interests by evaluating the sufficiency of each entity’s equity investment at risk to absorb losses. Entities which the Company does not control and are considered VIEs, but where the Company is not the primary beneficiary, are accounted for under the equity method. All significant intercompany balances and transactions have been eliminated. The equity interests of other limited partners in the Company’s Operating Partnership are reflected as noncontrolling interests.
Real Estate Investments	Real Estate Investments Real Estate Acquisitions In January 2017, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update, or ASU, 2017-01, Amendments to Business Combinations, which clarifies the framework for determining whether an integrated set of assets and activities meets the definition of a business. The revised framework narrows the definition of a business, which is expected to result in fewer transactions being accounted for as business combinations. Acquisitions of integrated sets of assets and activities that do not meet the definition of a business are accounted for as asset acquisitions. Although the Company is not required to implement ASU 2017-01 until annual periods beginning after December 15, 2017, including interim periods within those periods, the Company early adopted the new standard in the first quarter of 2017. As a result, the Company evaluated its real estate acquisitions during the six months ended June 30, 2017 under the new framework and determined the properties acquired did not meet the definition of a business, thus the transactions were accounted for as asset acquisitions. Refer to the "Recently Issued Accounting Pronouncements" section below for more information on the new guidance and refer to Note 4 for more information on the transactions during the six months ended June 30, 2017 . The Company evaluates its acquisitions of real estate, including equity interests in entities that predominantly hold real estate assets, to determine if the acquired assets meet the definition of a business and need to be accounted for as a business combination, or alternatively, should be accounted for as an asset acquisition. An integrated set of assets and activities acquired does not meet the definition of a business if either (i) substantially all the fair value of the gross assets acquired is concentrated in either a single identifiable asset or a group of similar identifiable assets, or (ii) the asset and activities acquired do not contain at least an input and a substantive process that together significantly contribute to the ability to create outputs. The Company expects that its acquisitions of real estate will continue to not meet the revised definition of a business. Acquisitions of real estate that do not meet the definition of a business, including sale-leaseback transactions that have newly-originated leases and real estate investments under construction, or build-to-suit investments, are recorded as asset acquisitions. The accounting for asset acquisitions is similar to the accounting for business combinations, except that the acquisition consideration, including acquisition costs, is allocated to the individual assets acquired and liabilities assumed on a relative fair value basis. Based on this allocation methodology, asset acquisitions do not result in the recognition of goodwill or a bargain purchase. The Company incurs internal transaction costs, which are direct, incremental internal costs related to acquisitions, that are recorded within general and administrative expense. Additionally, for build-to-suit investments in which the Company may engage a developer to construct a property or provide funds to a tenant to develop a property, the Company capitalizes the funds provided to the developer/tenant and real estate taxes, if applicable, during the construction period. To determine the fair value of assets acquired and liabilities assumed in an acquisition, which generally include land, building, improvements, and intangibles, such as the value of above- and below-market leases and origination costs associated with the in-place leases at the acquisition date, the Company utilizes various estimates, processes and information to determine the as-if-vacant property value. Estimates of value are made using customary methods, including data from appraisals, comparable sales, and discounted cash flow analyses. Estimates of future cash flows are based on a number of factors including the historical operating results, known trends, and market/economic conditions that may affect the property. The Company assesses the fair value of leases assumed at acquisition based upon estimated cash flow projections that utilize appropriate discount rates and available market information. Refer to the policy section "Intangible Assets and Liabilities" for more information on the Company’s accounting for intangibles. Depreciation is computed using the straight-line method over the shorter of the estimated useful life at acquisition of the capitalized item or 40 years for buildings, five to ten years for building equipment and fixtures, and the lesser of the useful life or the remaining lease term for tenant improvements and leasehold interests. Maintenance and repair expenditures are charged to expense as incurred. For transactions that qualify as business combinations, the Company recognizes the assets acquired and liabilities assumed at fair value, including the value of intangible assets and liabilities, and any excess or deficit of the consideration transferred relative to the fair value of the net assets acquired is recorded as goodwill or a bargain purchase gain, as appropriate. Acquisition costs of business combinations are expensed as incurred. Capital Improvements In leasing space, the Company may provide funding to the lessee through a tenant allowance. Certain improvements are capitalized when they are determined to increase the useful life of the building. During construction of qualifying projects, the Company capitalizes project management fees as permitted to be charged under the lease, if incremental and identifiable. In accounting for tenant allowances, the Company determines whether the allowance represents funding for the construction of leasehold improvements and evaluates the ownership of such improvements. If the Company is considered the owner of the leasehold improvements, the Company capitalizes the amount of the tenant allowance and depreciates it over the shorter of the useful life of the leasehold improvements or the lease term. If the tenant allowance represents a payment for a purpose other than funding leasehold improvements, or in the event the Company is not considered the owner of the improvements for accounting purposes, the allowance is considered to be a lease incentive and is recognized over the lease term as a reduction of rental revenue. Factors considered during this evaluation usually include (i) who holds legal title to the improvements, (ii) evidentiary requirements concerning the spending of the tenant allowance, and (iii) other controlling rights provided by the lease agreement (e.g. unilateral control of the tenant space during the build-out process). Determination of the accounting for a tenant allowance is made on a case-by-case basis, considering the facts and circumstances of the individual tenant lease. Impairments The Company reviews the recoverability of a property’s carrying value when circumstances indicate a possible impairment of the value of a property, such as an adverse change in future expected occupancy or a significant decrease in the market price of an asset. The review of recoverability is based on an estimate of the future undiscounted cash flows, excluding interest charges, expected to result from the property’s use and eventual disposition. These estimates consider factors such as changes in strategy resulting in an increased or decreased holding period, expected future operating income, market and other applicable trends and residual value, as well as the effects of leasing demand, competition and other factors. If management determines impairment exists due to the inability to recover the carrying value of a property, for properties to be held and used, an impairment loss is recorded to the extent that the carrying value exceeds the estimated fair value of the property and for assets held for sale, an impairment loss is recorded to the extent that the carrying value exceeds the fair value less estimated cost of disposal. These assessments are recorded as an impairment loss in the Condensed Consolidated Statements of Operations in the period the determination is made. The estimated fair value of the asset becomes its new cost basis. For a depreciable long-lived asset to be held and used, the new cost basis will be depreciated or amortized over the remaining useful life of that asset.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers all highly liquid investments with maturities of three months or less when purchased to be cash equivalents.
Restricted Cash	Restricted Cash The Company had restricted cash of $40,326 and $12,904 at June 30, 2017 and December 31, 2016 , respectively, which primarily consisted of proceeds from property sales held by qualified intermediaries to be used for tax-deferred, like-kind exchanges under Internal Revenue Code, or IRC, Section 1031, reserves for certain capital improvements, leasing, interest and real estate tax and insurance payments as required by certain mortgage note obligations.
Variable Interest Entities, Consolidated and Unconsolidated	Consolidated VIEs Operating Partnership The Operating Partnership is a consolidated VIE because the Company is its primary beneficiary due to its majority ownership and ability to exercise control over every aspect of the Operating Partnership’s operations. Gramercy Europe Asset Management (European Fund Manager) In connection with the Company’s December 2014 investment in the Gramercy European Property Fund, the Company acquired equity interests in the entity, hereinafter European Fund Manager, which provides investment and asset management services to the Gramercy European Property Fund. The Company determined that European Fund Manager is a VIE, as the equity holders of that entity do not have controlling financial interests and do not have the obligation to absorb losses. As Gramercy Europe Asset Management, through an investment advisory agreement with the VIE, controls the activities that most significantly affect the economic outcome of European Fund Manager, the Company concluded that it is the entity’s primary beneficiary and has consolidated the VIE. The Company receives net cash inflows from European Fund Manager in the form of management fees, and if the VIE’s cash inflows are not sufficient to cover its obligations, the Company may provide financial support for the VIE. Proportion Foods In December 2015, the Company entered into a non-recourse financing arrangement with Big Proportion Austin LLC, or BIG, for a build-to-suit industrial property in Round Rock, Texas, or Proportion Foods. Concurrently, the Company entered into a forward purchase agreement with BIG, pursuant to which the Company agreed to acquire the property, which is 100.0% leased to Proportion Foods, upon substantial completion of the facility’s development. The Company determined that Proportion Foods was a VIE, as the equity holders of the entity did not have controlling financial interests and were not obligated to absorb losses. The Company controlled the activities that most significantly affected the economic outcome of Proportion Foods through its financing arrangement to fund the property’s development and its forward purchase agreement with BIG. As such, the Company concluded it was the entity’s primary beneficiary and consolidated the VIE. The construction of the facility on the property was completed in March 2017, at which time the Company acquired the property. Following the acquisition, the property was wholly-owned by the Company and was no longer a consolidated VIE. Unconsolidated VIEs Gramercy Europe Asset Management (European Fund Carry Co.) In connection with the Company’s December 2014 investment in the Gramercy European Property Fund, the Company acquired equity interests in the entity, hereinafter European Fund Carry Co., entitled to receive certain preferential distributions, if any, made from time-to-time by the Gramercy European Property Fund. The Company determined that European Fund Carry Co. is a VIE, as the equity holders of that entity do not have controlling financial interests and do not have the obligation to absorb losses in excess of capital committed. Decisions that most significantly affect the economic performance of European Fund Carry Co. are decided by a majority vote of that VIE’s shareholders. As such, the Company does not have a controlling financial interest in the VIE and accounts for it as an equity investment. Investment in Retained CDO Bonds The Company has retained non-investment grade subordinate bonds, preferred shares and ordinary shares of three collateralized debt obligations, or CDOs, together the Retained CDO Bonds. The Company does not control the activities that most significantly impact the Retained CDO Bonds’ economic performance and is not obligated to provide any financial support to them, thus the Retained CDO Bonds have been determined to be unconsolidated VIEs, in which the Company’s interest is recorded at fair value within other assets on the Condensed Consolidated Balance Sheets. The Retained CDO Bonds may provide the potential for the Company to receive continuing cash flows in the future, however, there is no guarantee that the Company will realize any proceeds from the Retained CDO Bonds or what the timing of the proceeds may be. The Company’s maximum exposure to loss is limited to its interest in the Retained CDO Bonds. In April 2017, one of the CDOs, in which the Company’s retained interest has no value, commenced liquidation. The Company will not receive any proceeds from the liquidation. Thus, as of June 30, 2017, one of the Retained CDO Bonds is no longer considered a VIE of the Company.
Tenant and Other Receivables	Tenant and Other Receivables Tenant and other receivables are derived from rental revenue, tenant reimbursements, and management fees. Rental revenue is recorded on a straight-line basis over the initial term of the lease. Since many leases provide for rental increases at specified intervals, straight-line basis accounting requires the Company to record a receivable, and include in revenues, unbilled rent receivables that will only be received if the tenant makes all rent payments required through the expiration of the initial term of the lease. Tenant and other receivables also include receivables related to tenant reimbursements for common area maintenance expenses and certain other recoverable expenses that are recognized as revenue in the period in which the related expenses are incurred. Tenant and other receivables are recorded net of the allowances for doubtful accounts, which as of June 30, 2017 and December 31, 2016 were $523 and $57 , respectively. The Company continually reviews receivables related to rent, tenant reimbursements, and management fees, including incentive fees, and determines collectability by taking into consideration the tenant or asset management clients’ payment history, the financial condition of the tenant or asset management client, business conditions in the industry in which the tenant or asset management client operates and economic conditions in the area in which the property or asset management client is located. In the event that the collectability of a receivable is in doubt, the Company increases the allowance for doubtful accounts or records a direct write-off of the receivable, as appropriate. Management fees, including incentive management fees, are recognized as earned in accordance with the terms of the management agreements. The management agreements may contain provisions for fees related to dispositions, administration of the assets including fees related to accounting, valuation and legal services, and management of capital improvements or projects on the underlying assets.
Intangible Assets and Liabilities	Intangible Assets and Liabilities As discussed above in the policy section “Real Estate Acquisitions” the Company follows the acquisition method of accounting for its asset acquisitions and business combinations and thus allocates the purchase price of acquired properties to tangible and identifiable intangible assets acquired based on their respective fair values. Identifiable intangible assets include amounts allocated to acquired leases for above- and below- market lease rates and the value of in-place leases. Management also considers information obtained about each property as a result of its pre-acquisition due diligence. Above-market and below-market lease values for properties acquired are recorded based on the present value of the difference between the contractual amount to be paid pursuant to each in-place lease and management’s estimate of the fair market lease rate for each such in-place lease, measured over a period equal to the remaining non-cancelable term of the lease. The present value calculation utilizes a discount rate that reflects the risks associated with the leases acquired. The above-market and below-market lease values are amortized as a reduction of and increase to rental revenue, respectively, over the remaining non-cancelable terms of the respective leases. If a tenant terminates its lease prior to its contractual expiration and no future rental payments will be received, any unamortized balance of the market lease intangibles will be written off to rental revenue. The aggregate value of in-place leases represents the costs of leasing costs, other tenant related costs, and lost revenue that the Company did not have to incur by acquiring a property that is already occupied. Factors considered by management in its analysis of the in-place lease intangibles include an estimate of carrying costs during the expected lease-up period for each property taking into account current market conditions and costs to execute similar leases, including leasing commissions and other related expenses. In estimating carrying costs, management includes real estate taxes, insurance and other operating expenses and estimates of lost rentals at market rates during the anticipated lease-up period. The value of in-place leases is amortized to depreciation and amortization expense over the remaining non-cancelable term of the respective leases, but never over a term that exceeds the remaining depreciable life of the building. If a tenant terminates its lease prior to its contractual expiration and no future rental payments will be received, any unamortized balance of the in-place lease intangible will be written off to depreciation and amortization expense. Above-market and below-market ground rent intangibles are recorded for properties acquired in which the Company is the lessee pursuant to a ground lease assumed at acquisition. The above-market and below-market ground rent intangibles are valued similarly to above-market and below-market leases, except that, because the Company is the lessee as opposed to the lessor, the above-market and below-market ground lease values are amortized as a reduction of and increase to rent expense, respectively, over the remaining non-cancelable terms of the respective leases.
Revenue Recognition	Revenue Recognition Real Estate Investments Rental revenue from leases on real estate investments is recognized on a straight-line basis over the term of the lease, regardless of when payments are contractually due. The excess of rental revenue recognized over the amounts contractually due according to the underlying leases are included in other liabilities on the Condensed Consolidated Balance Sheets. For leases on properties that are under construction at the time of acquisition, the Company begins recognition of rental revenue upon completion of construction of the leased asset and delivery of the leased asset to the tenant. The Company’s lease agreements with tenants also generally contain provisions that require tenants to reimburse the Company for real estate taxes, insurance costs, common area maintenance costs, and other property-related expenses. Under lease arrangements in which the Company is the primary obligor for these expenses, such amounts are recognized as both revenues and operating expenses for the Company. Under lease arrangements in which the tenant pays these expenses directly, such amounts are not included in revenues or expenses. These reimbursement amounts are recognized in the period in which the related expenses are incurred. The Company recognizes sales of real estate properties only upon closing. Payments received from purchasers prior to closing are recorded as deposits. Profit on real estate sold is recognized using the full accrual method upon closing when the collectability of the sale price is reasonably assured and the Company is not obligated to perform significant activities after the sale. Profit may be deferred in whole or part until the sale meets the requirements of profit recognition on sale of real estate. Third-Party Management Fees The Company’s asset and property management agreements may contain provisions for fees related to dispositions, administration of the assets including fees related to accounting, valuation and legal services, and management of capital improvements or projects on the underlying assets. The Company recognizes revenue for fees pursuant to its management agreements in the period in which they are earned. Deferred revenue from management fees received prior to the date earned is included in other liabilities on the Condensed Consolidated Balance Sheets. Certain of the Company’s asset management contracts and agreements with its unconsolidated equity investments include provisions that allow it to earn additional fees, generally described as incentive fees or promoted interests, based on the achievement of a targeted valuation or the achievement of a certain internal rate of return on the managed assets held by third parties or the equity investment. The Company recognizes incentive fees on its asset management contracts based upon the amount that would be due pursuant to the contract, if the contract were terminated at the reporting date. If the incentive fee is a fixed amount, only a proportionate share of revenue is recognized at the reporting date, with the remaining fees recognized on a straight-line basis over the measurement period. The Company recognizes promoted interest in the period in which it is determined to be appropriately earned pursuant to the terms of the specific agreement. The values of incentive management fees and promoted interest fees are periodically evaluated by management. For the three months ended June 30, 2017 , the Company did no t recognize any incentive fee revenue and for the six months ended June 30, 2017 , the Company recognized incentive fees of $1,449 . For the three and six months ended June 30, 2016 , the Company recognized incentive fees of $14,217 and $15,190 , respectively. Other Income Other income primarily consists of miscellaneous property related income, lease termination fees, income accretion on the Company’s Retained CDO Bonds, which are measured at fair value on a quarterly basis using a discounted cash flow model, realized foreign currency exchange gains (losses), and interest income.
Foreign Currency	Foreign Currency Gramercy Europe Asset Management performs asset and property management services in the United Kingdom. The Company has unconsolidated equity investments in Europe and Asia and had two wholly-owned properties in Canada and one wholly-owned property in the United Kingdom until their dispositions in March 2017 and December 2016, respectively. The Company also has borrowings outstanding in euros and British pounds sterling under the multicurrency portion of its revolving credit facility. Refer to Note 5 for more information on the Company’s foreign unconsolidated equity investments. Foreign Currency Translation During the periods presented, the Company has had interests in Europe and Canada for which the functional currencies are the euro, the British pound sterling, and the Canadian dollar, respectively. The Company performs the translation from these foreign currencies to the U.S. dollar for assets and liabilities using the exchange rates in effect at the balance sheet date and for revenue and expense accounts using a weighted average exchange rate during the period. The Company reports the gains and losses resulting from such translation as a component of other comprehensive income. For the three and six months ended June 30, 2017 , the Company recorded net translation gains of $1,126 and $1,817 , respectively. For the three and six months ended June 30, 2016 , the Company recorded net translation losses of $8,686 and $2,567 , respectively. Translation gains and losses are reclassified to other income within earnings when the Company has substantially exited from the foreign currency denominated asset or liability. Foreign Currency Transactions A transaction gain or loss realized upon settlement of a foreign currency transaction will be included in earnings for the period in which the transaction is settled. Foreign currency intercompany transactions that are scheduled for settlement are included in the determination of net income. Intercompany foreign currency transactions of a long-term nature that do not have a planned or foreseeable future settlement date, in which the entities to the transactions are consolidated or accounted for by the equity method in the Company’s financial statements, are not included in net income but are reported as a component of other comprehensive income.
Other Assets	Other Assets The Company includes prepaid expenses, capitalized software costs, contract intangible assets, deferred costs, goodwill, derivative assets, and Retained CDO Bonds in other assets.
Goodwill	Goodwill Goodwill represents the fair value of the collaboration expected to be achieved upon consummation of a business combination and is measured as the excess of consideration transferred over the net assets acquired at acquisition date. The Company recognized goodwill of $3,802 related to the acquisition of Gramercy Europe Limited, or Gramercy Europe Asset Management. The carrying value of goodwill has been adjusted each reporting period for the effect of foreign currency translation adjustments. The carrying value of goodwill at June 30, 2017 and December 31, 2016 was $3,100 and $2,988 , respectively. The Company’s goodwill has had an indeterminate life and has not been amortized, but has been tested for impairment on an annual basis, or more frequently if events or changes in circumstances indicate that the asset might be impaired. The Company takes a qualitative approach to consider whether an impairment of goodwill exists prior to quantitatively determining the fair value of the reporting unit in the impairment test. The Company did no t record any impairment on its goodwill during the three and six months ended June 30, 2017 .
Retained CDO Bonds	Retained CDO Bonds The Retained CDO Bonds are non-investment grade subordinate bonds, preferred shares and ordinary shares of three CDOs. Management estimated the timing and amount of cash flows expected to be collected and recognized an investment in the Retained CDO Bonds equal to the net present value of these discounted cash flows. There is no guarantee that the Company will realize any proceeds from this investment, or what the timing will be for the expected remaining life of the Retained CDO Bonds. The Company considers these investments to be not of high credit quality and does not expect a full recovery of interest and principal. Therefore, the Company has suspended interest income accruals on these investments. The Company classifies the Retained CDO Bonds as available for sale. On a quarterly basis, the Company evaluates the Retained CDO Bonds to determine whether significant changes in estimated cash flows or unrealized losses on these investments, if any, reflect a decline in value which is other-than-temporary. If there is a decrease in estimated cash flows and the investment is in an unrealized loss position, the Company will record an other-than-temporary impairment, or OTTI, in the Condensed Consolidated Statements of Operations. To determine the component of the OTTI related to expected credit losses, the Company compares the amortized cost basis of the Retained CDO Bonds to the present value of the revised expected cash flows, discounted using the pre-impairment effective yield. Conversely, if the security is in an unrealized gain position and there is a decrease or significant increase in expected cash flows, the Company will prospectively adjust the yield using the effective yield method. Refer to Note 9 for further discussion regarding the fair value measurement of the Retained CDO Bonds.
Concentrations of Credit Risk	Concentrations of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash investments, debt investments and accounts receivable. The Company places its cash investments in excess of insured amounts with high quality financial institutions. Concentrations of credit risk also arise when a number of the Company’s tenants or asset management clients are engaged in similar business activities or are subject to similar economic risks or conditions that could cause their inability to meet contractual obligations to the Company. The Company regularly monitors its portfolio to assess potential concentrations of credit risk. Management believes the current credit risk portfolio is reasonably well diversified.
Segment Reporting	Segment Reporting ASC 280, Segment Reporting, establishes standards for the manner in which public enterprises report information about operating segments. In prior periods, the Company has viewed and presented its operations as two segments, Investments/Corporate and Asset Management. However, based upon the significant reduction in the Company’s third-party asset management operations following the expiration of the KBS management contract, as of June 30, 2017, the Company views its operations as one segment, which consists of net leasing operations. The Company has no other reportable segments.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers, which is a comprehensive new revenue recognition model requiring a company to recognize revenue to depict the transfer of goods or services to customers in an amount reflecting the consideration it expects to receive in exchange for those goods or services. The guidance also requires enhanced disclosures related to the nature, amount, timing, and uncertainty of revenue that is recognized. In April 2016, the FASB issued ASU 2016-10, which amends the new revenue recognition guidance on identifying performance obligations. In February 2017, the FASB issued ASU 2017-05, which clarifies the scope of gains and losses from the derecognition of nonfinancial assets and provides guidance for the partial sales of nonfinancial assets in context of the new revenue standard. The new revenue recognition guidance is effective for the first interim period within annual reporting periods beginning after December 15, 2017, with early adoption permitted for the first interim period within annual reporting periods beginning after December 15, 2016. Companies may use either a full retrospective or a modified retrospective approach to adopt the new guidance. A substantial portion of the Company’s revenue consists of rental revenue from leasing arrangements, which is specifically excluded from the new revenue guidance, however the Company also generates revenue from operating expense reimbursements, management fees, incentive fees, and gains and impairments on disposals, which will be impacted by the new revenue standard. The Company does not believe the new revenue guidance will have a material impact on its recognition and disclosure of revenue, except as it pertains to revenue recognized for certain of its sales of unconsolidated equity investments. The Company currently expects to adopt the standard in the first quarter of 2018 using the modified retrospective approach. I n February 2016, the FASB issued ASU 2016-02, Leases, which amends the existing accounting standards for lease accounting, including requiring lessees to recognize most leases on their balance sheets and making targeted changes to lessor accounting. The update will be effective beginning in the first quarter of 2019 and early adoption is permitted. The new standard requires a modified retrospective transition approach for all leases existing at, or entered into after, the date of initial application, with an option to use certain transition relief. The Company’s accounting for leases in which it is a lessor, which represents most of its leasing arrangements, will be largely unchanged under ASU 2016-02, however the Company is a lessee in several operating and ground leases and the accounting for these arrangements is more significantly impacted by the new standard. Pursuant to the new guidance, lessees are required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. The Company is continuing to evaluate the impact of adopting the new leases standard on its Condensed Consolidated Financial Statements. In March 2016, the FASB issued ASU 2016-09, Compensation - Stock Compensation: Improvements to Employee Share-Based Payment Accounting. The update serves to simplify the accounting for share-based payment award transactions, including income tax consequences, classification of awards as either equity or liabilities, and classification of awards on the statement of cash flows. The guidance in the ASU is effective for fiscal years beginning after December 15, 2016. The Company adopted the new guidance in the first quarter of 2017. The adoption of this guidance did not have a material impact on the Company’s Condensed Consolidated Financial Statements. In January 2017, the FASB issued ASU 2017-01, Amendments to Business Combinations, which amends the current guidance to clarify the definition of a business in order to assist entities in evaluating whether transactions should be accounted for as acquisitions or disposals of assets or businesses. The guidance is effective for annual and interim periods beginning after December 15, 2017, with early adoption permitted under certain circumstances. The amendments must be applied prospectively as of the beginning of the period of adoption. The Company elected to early adopt ASU 2017-01 in the first quarter of 2017, as described in the “Real Estate Acquisitions” section above. In January 2017, the FASB issued ASU 2017-04, Intangibles- Goodwill and Other, which simplifies the accounting for goodwill impairments. Under the new guidance, an impairment charge is recorded based on the excess of the reporting unit’s carrying amount over its fair value. The guidance is effective for annual or interim goodwill impairment tests in fiscal years beginning after December 31, 2019 with early adoption permitted for impairment tests after January 1, 2017. The Company is currently evaluating the impact of this guidance on its Condensed Consolidated Financial Statements. In May 2017, the FASB issued ASU 2017-09, Compensation-Stock Compensation: Scope of Modification Accounting. The amendment provides guidance on determining which changes to the terms and conditions of share-based payment awards require an entity to apply modification accounting. The guidance is effective for annual and interim periods beginning after December 15, 2017, with early adoption permitted under certain circumstances. The Company is currently evaluating the impact of this guidance on its Condensed Consolidated Financial Statements.

Significant Accounting Polici27

Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Schedule of Variable Interest Entities	The following is a summary of the Company’s involvement with VIEs as of June 30, 2017 : Company carrying value-assets Company carrying value-liabilities Face value of assets held by the VIEs Face value of liabilities issued by the VIEs Consolidated VIEs: Operating Partnership $ 5,686,906 $ 2,722,775 $ 5,686,906 $ 2,722,775 Gramercy Europe Asset Management (European Fund Manager) $ 1,348 $ 25 $ 1,348 $ 2,073 Unconsolidated VIEs: Gramercy Europe Asset Management (European Fund Carry Co.) $ 5 $ — $ 18 $ — Retained CDO Bonds $ 6,345 $ — $ 135,640 $ 113,252 The following is a summary of the Company’s involvement with VIEs as of December 31, 2016 : Company carrying value-assets Company carrying value-liabilities Face value of assets held by the VIEs Face value of liabilities issued by the VIEs Consolidated VIEs: Operating Partnership $ 5,603,527 $ 2,842,493 $ 5,603,527 $ 2,842,493 Proportion Foods $ 22,836 $ 3,041 $ 22,836 $ 23,514 Gramercy Europe Asset Management (European Fund Manager) $ 1,100 $ 47 $ 1,100 $ 1,742 Unconsolidated VIEs: Gramercy Europe Asset Management (European Fund Carry Co.) $ 8 $ — $ 31 $ — Retained CDO Bonds $ 11,906 $ — $ 391,990 $ 592,414
Schedule of Intangible Assets and Acquired Lease Obligations	Intangible assets and liabilities consist of the following: June 30, 2017 December 31, 2016 Intangible assets: In-place leases, net of accumulated amortization of $154,831 and $117,717 $ 506,094 $ 553,924 Above-market leases, net of accumulated amortization of $20,080 and $15,719 53,730 59,647 Below-market ground rent, net of accumulated amortization of $337 and $274 5,046 5,109 Amounts related to assets held for sale, net of accumulated amortization of $456 and $0 (1,639 ) — Total intangible assets $ 563,231 $ 618,680 Intangible liabilities: Below-market leases, net of accumulated amortization of $26,766 and $26,168 $ 176,453 $ 223,110 Above-market ground rent, net of accumulated amortization of $355 and $248 6,946 7,073 Amounts related to liabilities of assets held for sale, net of accumulated amortization of $1,030 and $0 (7,764 ) — Total intangible liabilities $ 175,635 $ 230,183
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	The following table provides the weighted-average amortization period as of June 30, 2017 for intangible assets and liabilities and the projected amortization expense for the next five years. Weighted-Average Amortization Period (years) July 1 to December 31, 2017 2018 2019 2020 2021 In-place leases 9.2 $ 45,302 $ 85,600 $ 71,830 $ 58,645 $ 50,813 Total to be included in depreciation and amortization expense $ 45,302 $ 85,600 $ 71,830 $ 58,645 $ 50,813 Above-market lease assets 7.2 $ 5,512 $ 10,574 $ 9,377 $ 7,255 $ 6,043 Below-market lease liabilities 18.7 (5,604 ) (11,122 ) (10,787 ) (10,464 ) (10,314 ) Total to be included in rental revenue $ (92 ) $ (548 ) $ (1,410 ) $ (3,209 ) $ (4,271 ) Below-market ground rent 40.9 $ 64 $ 127 $ 127 $ 127 $ 127 Above-market ground rent 32.7 (107 ) (214 ) (214 ) (214 ) (214 ) Total to be included in property operating expense $ (43 ) $ (87 ) $ (87 ) $ (87 ) $ (87 )
Schedule of Retained Collateralized Debt Obligation Bonds	A summary of the Company’s Retained CDO Bonds as of June 30, 2017 is as follows: Number of Securities Face Value Amortized Cost Gross Unrealized Gain Other-than-temporary impairment Fair Value Weighted Average Expected Life (years) 6 $ 322,006 $ 4,215 $ 2,130 $ (4,890 ) $ 6,345 1.6
Other Than Temporary Impairment Credit Losses Recognized in Earnings	The following table summarizes the activity related to credit losses on the Retained CDO Bonds for the six months ended June 30, 2017 and for the year ended December 31, 2016 : 2017 2016 Balance as of January 1, 2017 and 2016, respectively, of credit losses on Retained CDO Bonds for which a portion of an OTTI was recognized in other comprehensive income (loss) $ (491 ) $ 3,196 Additions to credit losses: On Retained CDO Bonds for which an OTTI was not previously recognized — — On Retained CDO Bonds for which an OTTI was previously recognized and a portion of an OTTI was recognized in other comprehensive income (loss) 4,890 — On Retained CDO Bonds for which an OTTI was previously recognized without any portion of OTTI recognized in other comprehensive income (loss) — — Reduction for credit losses: — — On Retained CDO Bonds for which no OTTI was recognized in other — — On Retained CDO Bonds sold during the period — — On Retained CDO Bonds charged off during the period — — For increases in cash flows expected to be collected that are recognized over the remaining life of the Retained CDO Bonds (1,691 ) (3,687 ) Balance as of June 30, 2017 and December 31, 2016, respectively, of credit of losses on Retained CDO Bonds for which a portion of an OTTI was recognized in other comprehensive income (loss) $ 2,708 $ (491 )

Dispositions, Assets Held for28

Dispositions, Assets Held for Sale, and Discontinued Operations (Tables)	6 Months Ended
	Jun. 30, 2017
Discontinued Operations and Disposal Groups [Abstract]
Summary of Disposal Groups and Discontinued Operations	The following table summarizes the assets held for sale and liabilities related to the assets held for sale as of June 30, 2017 : Assets held for sale June 30, 2017 Real estate investments $ 13,018 Acquired lease assets, net 1,639 Other assets 84 Total assets $ 14,741 Liabilities related to assets held for sale Below-market lease liabilities, net 7,764 Other liabilities 196 Total liabilities $ 7,960 Net assets held for sale $ 6,781
Schedule Of Operating Results Of Assets Held For Sale Including In Discontinued Operations	The following operating results for the three and six months ended June 30, 2017 and 2016 are included in discontinued operations for all periods presented: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Revenues $ 3 $ 140 $ (3 ) $ 5,997 Operating expenses — (56 ) 6 (2,236 ) General and administrative expense (31 ) (26 ) (55 ) (38 ) Interest expense — — — (955 ) Gain on extinguishment of debt — — — 1,930 Net income (loss) from discontinued operations $ (28 ) $ 58 $ (52 ) $ 4,698
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Schedule of Supplemental Cash Flow Activities	The following table represents supplemental cash flow disclosures for the six months ended June 30, 2017 and 2016 : Six Months Ended June 30, 2017 2016 Supplemental cash flow disclosures: Interest paid $ 44,441 $ 40,639 Income taxes paid $ 296 $ 743 Proceeds from 1031 exchanges from sale of real estate $ 170,210 $ 270,429 Use of funds from 1031 exchanges for acquisitions of real estate $ (140,987 ) $ (227,521 ) Non-cash activity: Fair value adjustment to noncontrolling interest in the Operating Partnership $ 576 $ 2,159 Debt assumed in acquisition of real estate $ 3,680 $ 45,958 Debt transferred in disposition of real estate $ (10,456 ) $ (101,432 ) Non-cash acquisition of consolidated VIE $ 24,930 $ — Dividend reinvestment plan proceeds $ 103 $ — Distribution of real estate assets from unconsolidated equity investment $ — $ 263,015 Redemption of units of noncontrolling interest in the Operating Partnership for common shares $ (2,697 ) $ (2,204 )
Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Schedule of Supplemental Cash Flow Activities	The table below presents additional relevant information pertaining to results of discontinued operations for the six months ended June 30, 2017 and 2016 , including depreciation, amortization, capital expenditures, and significant operating and investing noncash items: Six Months Ended June 30, 2017 2016 Significant operating noncash items $ — $ (9,452 ) Increase in cash and cash equivalents related to foreign currency translation — 1,045 Total $ — $ (8,407 )

Real Estate Investments (Tables

Real Estate Investments (Tables)	6 Months Ended
	Jun. 30, 2017
Real Estate [Abstract]
Schedule of Business Acquisitions, by Acquisition	The aggregate changes recorded from the preliminary purchase price allocations to the finalized purchase price allocations, are shown in the table below and are reflected in earnings for the six months ended June 30, 2017 : Preliminary Allocations recorded Finalized Allocations recorded Real Estate Assets Intangible Assets Intangible Liabilities Real Estate Assets Intangible Assets Intangible Liabilities Decrease to Rental Revenue Increase to Depreciation and Amortization Expense $ 513,424 $ 61,178 $ 11,093 $ 513,087 $ 60,627 $ 10,205 $ 27 $ 16

Unconsolidated Equity Investm30

Unconsolidated Equity Investments (Tables)	6 Months Ended
	Jun. 30, 2017
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]
Equity Method Investments	As of June 30, 2017 and December 31, 2016 , the Company owned properties through unconsolidated equity investments and had investment interests in these unconsolidated entities as follows: As of June 30, 2017 As of December 31, 2016 Investment Ownership % Voting Interest % Partner Investment in Unconsolidated Equity Investment 1 No. of Properties Investment in Unconsolidated Equity Investment 1 No. of Properties Gramercy European Property Fund 2 14.2 % 14.2 % Various $ 55,724 30 $ 50,367 26 Goodman Europe JV 3 5.1 % 5.1 % Gramercy European Property Fund 3,370 8 3,491 8 Strategic Office Partners 25.0 % 25.0 % TPG Real Estate 23,079 10 15,872 6 Goodman UK JV 80.0 % 50.0 % Goodman Group 26,086 2 25,309 2 CBRE Strategic Partners Asia 5.07 % 5.07 % Various 3,995 2 4,145 2 Philips JV 25.0 % 25.0 % Various — 1 — 1 Morristown JV 50.0 % 50.0 % 21 South Street 2,626 1 2,623 1 Total $ 114,880 54 $ 101,807 46 1. The amounts presented include basis differences of $2,406 and $4,025 , net of accumulated amortization, for the Goodman Europe JV and Goodman UK JV, respectively, as of June 30, 2017 . The amounts presented include basis differences of $2,286 and $3,941 , net of accumulated amortization, for the Goodman Europe JV and Goodman UK JV, respectively, as of December 31, 2016 . 2. Includes European Fund Carry Co., which has a carrying value of $5 and $8 for the Company’s 25.0% interest as of June 30, 2017 and December 31, 2016 , respectively. 3. As of June 30, 2017 , the Company has a 5.1% direct interest in the Goodman Europe JV as well as an indirect interest in the remaining 94.9% interest of Goodman Europe JV through its 14.2% interest in the Gramercy European Property Fund. In the table above, as of December 31, 2016, the Company’s 94.9% interest in Goodman Europe JV held through its 14.2% interest in the Gramercy European Property Fund is included in the amount shown for the Gramercy European Property Fund and the Company’s 5.1% direct interest in the Goodman Europe JV is presented separately as the amount shown for the Goodman Europe JV.
Summary Investment Holdings	The following is a summary of the Company’s unconsolidated equity investments for the six months ended June 30, 2017 : Unconsolidated Equity Investments Balance at January 1, 2017 $ 101,807 Contributions to unconsolidated equity investments 7,400 Equity in net income of unconsolidated equity investments, including adjustments for basis differences 154 Other comprehensive income of unconsolidated equity investments 6,208 Distributions from unconsolidated equity investments (689 ) Balance at June 30, 2017 $ 114,880
Schedule of Combined Balance Sheet for the Company's Joint Venture	The balance sheets for the Company’s unconsolidated equity investments at June 30, 2017 are as follows: Gramercy European Property Fund 1 Goodman Europe JV Gramercy European Property Fund 2 Total Strategic Office Partners Goodman UK JV CBRE Strategic Partners Asia Other 3 Assets: Real estate assets, net 4 $ 238,253 $ 612,357 $ 850,610 $ 242,396 $ 31,614 $ 85,653 $ 49,065 Other assets 29,136 70,248 99,384 50,557 1,921 11,518 3,121 Total assets $ 267,389 $ 682,605 $ 949,994 $ 292,953 $ 33,535 $ 97,171 $ 52,186 Liabilities and members’ equity: Mortgage notes payable $ 150,436 $ 330,514 $ 480,950 $ 187,791 $ — $ — $ 39,270 Other liabilities 6,963 55,511 62,474 10,767 735 14,371 3,377 Total liabilities 157,399 386,025 543,424 198,558 735 14,371 42,647 Gramercy Property Trust equity 12,290 46,799 59,089 23,079 26,086 3,995 2,631 Other members’ equity 97,700 249,781 347,481 71,316 6,714 78,805 6,908 Liabilities and members’ equity $ 267,389 $ 682,605 $ 949,994 $ 292,953 $ 33,535 $ 97,171 $ 52,186 1. As of June 30, 2017 , the Company has a 5.1% direct interest in the Goodman Europe JV as well as an indirect interest in the remaining 94.9% i nterest that is held through the Company’s 14.2% interest in the Gramercy European Property Fund. In the table above, the Company’s equity interest in the Goodman Europe JV includes both its direct 5.1% interest as well as its indirect interest that is held through its 14.2% interest in the Gramercy European Property Fund, and the Company’s equity interest in the Gramercy European Property Fund represents its interest in all of the properties owned by the Gramercy European Property Fund except for the properties in the Goodman Europe JV. 2. Excludes the Gramercy European Property Fund’s 94.9% interest in the Goodman Europe JV. 3. Includes the Philips JV, the Morristown JV, and European Fund Carry Co. 4. Includes basis adjustments that were recorded by the Company to adjust the unconsolidated equity investments to fair value upon closing of the Merger. The balance sheets for the Company’s unconsolidated equity investments at December 31, 2016 are as follows: Gramercy European Property Fund 1 Goodman Europe JV Gramercy European Property Fund 2 Total Strategic Office Partners Goodman UK JV CBRE Strategic Partners Asia Other 3 Assets: Real estate assets, net 4 $ 285,087 $ 347,069 $ 632,156 $ 149,484 $ 25,128 $ 87,852 $ 49,580 Other assets 86,273 63,523 149,796 42,323 6,650 12,247 3,020 Total assets $ 371,360 $ 410,592 $ 781,952 $ 191,807 $ 31,778 $ 100,099 $ 52,600 Liabilities and members' equity: Mortgage notes payable $ 174,269 $ 215,980 $ 390,249 $ 121,894 $ — $ — $ 39,730 Other liabilities 7,778 19,940 27,718 4,347 934 14,383 3,259 Total liabilities 182,047 235,920 417,967 126,241 934 14,383 42,989 Gramercy Property Trust equity 12,734 41,116 53,850 15,872 25,309 4,145 2,631 Other members' equity 176,579 133,556 310,135 49,694 5,535 81,571 6,980 Liabilities and members' equity $ 371,360 $ 410,592 $ 781,952 $ 191,807 $ 31,778 $ 100,099 $ 52,600 1. As of December 31, 2016 , the Company has a 5.1% direct interest in the Goodman Europe JV as well as an indirect interest in the remaining 94.9% interest that is held through the Company’s 14.2% interest in the Gramercy European Property Fund. In the table above, the Company’s equity interest in the Goodman Europe JV includes both its direct 5.1% interest as well as its indirect interest that is held through its 14.2% interest in the Gramercy European Property Fund, and the Company’s equity interest in the Gramercy European Property Fund represents its interest in all of the properties owned by the Gramercy European Property Fund except for the properties in the Goodman Europe JV. 2. Excludes the Gramercy European Property Fund’s 94.9% interest in the Goodman Europe JV. 3. Includes the Philips JV, the Morristown JV, and European Fund Carry Co. 4. Includes basis adjustments that were recorded by the Company to adjust the unconsolidated equity investments to fair value upon closing of the Merger.
Schedule of Long-term Debt	The following is a summary of the secured financing arrangements within the Company’s unconsolidated equity investments as of June 30, 2017 : Outstanding Balance 2 Property Unconsolidated Equity Investment Economic Ownership Interest Rate 1 Maturity Date June 30, 2017 December 31, 2016 Strategic Office Partners portfolio 3 Strategic Office Partners 25.0% 4.08% 10/7/2019 $ 191,600 $ 125,000 Durrholz, Germany Gramercy European Property Fund 14.2% 1.52% 3/31/2020 13,197 12,289 Venray, Germany Gramercy European Property Fund 14.2% 3.32% 12/2/2020 14,068 13,015 Lille, France Gramercy European Property Fund 14.2% 3.13% 12/17/2020 29,422 27,081 Carlisle, United Kingdom Gramercy European Property Fund 14.2% 3.32% 2/19/2021 11,022 10,443 Saint Martin, France Gramercy European Property Fund 14.2% 2.67% 4/25/2021 15,608 — Castelnau, France Gramercy European Property Fund 14.2% 2.67% 4/25/2021 11,243 — Oud Beijerland, Netherlands Gramercy European Property Fund 14.2% 2.09% 12/30/2022 8,704 8,077 Zaandam, Netherlands Gramercy European Property Fund 14.2% 2.08% 12/30/2022 12,551 11,647 Kerkrade, Netherlands Gramercy European Property Fund 14.2% 2.08% 12/30/2022 10,369 9,622 Friedrichspark, Germany Gramercy European Property Fund 14.2% 2.08% 12/30/2022 9,370 8,694 Fredersdorf, Germany Gramercy European Property Fund 14.2% 2.08% 12/30/2022 12,120 11,247 Breda, Netherlands Gramercy European Property Fund 14.2% 1.90% 12/30/2022 10,721 9,948 Juechen, Germany Gramercy European Property Fund 14.2% 1.89% 12/30/2022 20,316 18,852 Piaseczno, Poland Gramercy European Property Fund 14.2% 1.98% 12/30/2022 8,773 8,141 Strykow, Poland Gramercy European Property Fund 14.2% 1.98% 12/30/2022 20,657 19,167 Uden, Netherlands Gramercy European Property Fund 14.2% 1.98% 12/30/2022 9,606 8,913 Rotterdam, Netherlands Gramercy European Property Fund 14.2% 1.89% 12/30/2022 8,227 7,633 Frechen, Germany Gramercy European Property Fund 14.2% 1.49% 12/30/2022 6,518 6,043 Meerane, Germany Gramercy European Property Fund 14.2% 1.35% 12/30/2022 10,945 10,138 Amsterdam, Netherlands Gramercy European Property Fund 14.2% 1.59% 12/30/2022 3,339 3,093 Tiel, Netherlands Gramercy European Property Fund 14.2% 1.59% 12/30/2022 9,904 9,174 Netherlands portfolio 4 Gramercy European Property Fund 14.2% 3.02% 6/28/2023 14,568 13,409 Kutno, Poland Gramercy European Property Fund 14.2% 1.91% 7/21/2023 6,399 5,890 European Facility 5 Goodman Europe JV 18.6% 6 0.90% 11/16/2023 34,277 31,551 European Facility 5 Goodman Europe JV 18.6% 6 1.75% 11/16/2023 116,159 106,917 Utrecht, Netherlands Gramercy European Property Fund 14.2% 1.95% 1/16/2024 39,277 — Worksop, United Kingdom Gramercy European Property Fund 14.2% 3.94% 10/20/2026 11,006 10,551 Somerset, NJ Philips JV 25.0% 6.90% 9/11/2035 39,270 39,730 Total mortgage notes payable $ 709,236 $ 546,265 Net deferred financing costs and net debt premium (1,225 ) 5,608 Total mortgage notes payable, net $ 708,011 $ 551,873 1. Represents the current effective rate as of June 30, 2017 , including the swapped interest rate for mortgage notes that have interest rate swaps. The current interest rate is not adjusted to include the amortization of fair market value premiums or discounts. 2. Mortgage notes are presented at 100.0% of the amount held by the unconsolidated equity investment. 3. There are ten properties under this mortgage note. 4. There are five properties under this mortgage note. 5. There are eight properties under this mortgage facility. 6. Represents the Company’s economic ownership in the Goodman Europe JV, which includes both its 5.1% direct interest in the Goodman Europe JV as well as an indirect interest in the remaining 94.9% interest that is held through the Company’s 14.2% interest in the Gramercy European Property Fund.
Schedule of Combined Income Statement for the Company's Joint Venture	The statements of operations for the Company’s unconsolidated equity investments for the three months ended June 30, 2017 are as follows: Gramercy European Property Fund 1 Goodman Europe JV Gramercy European Property Fund 2 Total Strategic Office Partners Goodman UK JV CBRE Strategic Partners Asia Other 3 Revenues $ 5,323 $ 11,479 $ 16,802 $ 7,174 $ 293 $ 230 $ 1,094 Operating expenses 945 2,802 3,747 2,316 225 283 116 Interest expense 614 1,798 2,412 2,055 — — 700 Depreciation and amortization 2,024 5,322 7,346 2,852 261 — 333 Total expenses 3,583 9,922 13,505 7,223 486 283 1,149 Net income (loss) from operations 1,740 1,557 3,297 (49 ) (193 ) (53 ) (55 ) Gain (loss) on derivatives — 1,049 1,049 (413 ) — — — Provision for taxes (15 ) (424 ) (439 ) — (20 ) — — Net income (loss) $ 1,725 $ 2,182 $ 3,907 $ (462 ) $ (213 ) $ (53 ) $ (55 ) Company's share in net income (loss) $ 88 $ 439 $ 527 $ (36 ) $ (171 ) $ (4 ) $ 9 Adjustments for REIT basis (37 ) — (37 ) — (40 ) — — Company's equity in net income (loss) within continuing operations $ 51 $ 439 $ 490 $ (36 ) $ (211 ) $ (4 ) $ 9 1. As of and for the three months ended June 30, 2017 , the Company had a 5.1% direct interest in the Goodman Europe JV as well as an indirect interest in the remaining 94.9% interest that is held through the Company’s 14.2% interest in the Gramercy European Property Fund. For the three months ended June 30, 2017 , the Company’s equity in net income (loss) of the entities is based on these ownership interest percentages during the period. 2. Excludes the results of the Gramercy European Property Fund’s 94.9% interest in the Goodman Europe JV, as the Goodman Europe JV is separately presented. 3. Includes the Philips JV, the Morristown JV, and European Fund Carry Co. The statements of operations for the Company’s unconsolidated equity investments for the six months ended June 30, 2017 are as follows: Gramercy European Property Fund 1 Goodman Europe JV Gramercy European Property Fund 2 Total Strategic Office Partners Goodman UK JV CBRE Strategic Partners Asia Other 3 Revenues $ 10,278 $ 21,597 $ 31,875 $ 12,700 $ 588 $ (2,215 ) $ 2,208 Operating expenses 1,867 5,753 7,620 3,790 527 701 274 Interest expense 1,286 3,272 4,558 3,565 — — 1,341 Depreciation and amortization 4,045 9,795 13,840 5,355 636 — 666 Total expenses 7,198 18,820 26,018 12,710 1,163 701 2,281 Net income (loss) from operations 3,080 2,777 5,857 (10 ) (575 ) (2,916 ) (73 ) Gain (loss) on derivatives — 2,270 2,270 (762 ) — — — Provision for taxes (32 ) (278 ) (310 ) — (28 ) — — Net income (loss) $ 3,048 $ 4,769 $ 7,817 $ (772 ) $ (603 ) $ (2,916 ) $ (73 ) Company's share in net income (loss) $ 155 $ 885 $ 1,040 $ (51 ) $ (483 ) $ (150 ) $ — Adjustments for REIT basis (73 ) — (73 ) — (129 ) — — Company's equity in net income (loss) within continuing operations $ 82 $ 885 $ 967 $ (51 ) $ (612 ) $ (150 ) $ — 1. As of and for the six months ended June 30, 2017 , the Company had a 5.1% direct interest in the Goodman Europe JV as well as an indirect interest in the remaining 94.9% interest that is held through the Company’s 14.2% interest in the Gramercy European Property Fund. For the six months ended June 30, 2017 , the Company’s equity in net income (loss) of the entities is based on these ownership interest percentages during the period. 2. Excludes the results of the Gramercy European Property Fund’s 94.9% interest in the Goodman Europe JV, as the Goodman Europe JV is separately presented. 3. Includes the Philips JV, the Morristown JV, and European Fund Carry Co. The statements of operations for the Company’s unconsolidated equity investments for the three months ended June 30, 2016 are as follows: Gramercy European Property Fund 1 Goodman Europe JV Gramercy European Property Fund Total Goodman UK JV Duke JV CBRE Strategic Partners Asia Other 2 Revenues $ 6,073 $ 5,884 $ 11,957 $ 636 $ 8,860 $ 1,024 $ 1,083 Operating expenses 833 1,068 1,901 186 2,128 288 85 Acquisition expenses 4,960 1,871 6,831 — — — 23 Interest expense 944 967 1,911 — 167 — 704 Depreciation and amortization 2,342 2,487 4,829 371 3,424 — 333 Total expenses 9,079 6,393 15,472 557 5,719 288 1,145 Net income (loss) from operations (3,006 ) (509 ) (3,515 ) 79 3,141 736 (62 ) Loss on derivatives — (1,489 ) (1,489 ) — — — — Provision for taxes — (276 ) (276 ) — — — — Net income (loss) $ (3,006 ) $ (2,274 ) $ (5,280 ) $ 79 $ 3,141 $ 736 $ (62 ) Company's share in net income (loss) $ (2,405 ) $ (438 ) $ (2,843 ) $ 63 $ 2,513 $ 36 $ 11 Adjustments for REIT basis 931 — 931 (7 ) (872 ) — — Company's equity in net income (loss) within continuing operations $ (1,474 ) $ (438 ) $ (1,912 ) $ 56 $ 1,641 $ 36 $ 11 1. As of June 30, 2016 , the Company has a 5.1% direct interest in the Goodman Europe JV as well as an indirect interest in the remaining 94.9% interest that is held through the Company’s 14.2% interest in the Gramercy European Property Fund. For the three months ended June 30, 2016 , the Company recorded its equity in net income (loss) from the Goodman Europe JV and the Gramercy European Property Fund based upon its day-weighted equity interest in the entities throughout the three months, which was 80.0% for Goodman Europe JV and 19.3% for the Gramercy European Property Fund. 2. Includes the Philips JV, the Morristown JV, and European Fund Carry Co. The statements of operations for the Company’s unconsolidated equity investments for the six months ended June 30, 2016 are as follows: Gramercy European Property Fund 1 Goodman Europe JV Gramercy European Property Fund Total Goodman UK JV Duke JV CBRE Strategic Partners Asia Other 2 Revenues $ 12,194 $ 10,941 $ 23,135 $ 4,920 $ 19,395 $ 242 $ 2,164 Operating expenses 1,696 1,569 3,265 473 5,118 867 213 Acquisition expenses 4,960 2,537 7,497 — — — 27 Interest expense 1,866 1,894 3,760 — 602 — 1,432 Depreciation and amortization 4,631 4,833 9,464 1,121 7,152 — 666 Total expenses 13,153 10,833 23,986 1,594 12,872 867 2,338 Net income (loss) from operations (959 ) 108 (851 ) 3,326 6,523 (625 ) (174 ) Loss on derivatives — (5,303 ) (5,303 ) — — — — Loss on extinguishment of debt — — — — (7,962 ) — — Net gain on disposals — — — — 38,535 — — Provision for taxes — (591 ) (591 ) — — — — Net income (loss) $ (959 ) $ (5,786 ) $ (6,745 ) $ 3,326 $ 37,096 $ (625 ) $ (174 ) Company's share in net income (loss) $ (768 ) $ (1,133 ) $ (1,901 ) $ 2,661 $ 29,675 $ (36 ) $ 4 Adjustments for REIT basis 445 — 445 (278 ) (33,493 ) — — Company's equity in net income (loss) within continuing operations $ (323 ) $ (1,133 ) $ (1,456 ) $ 2,383 $ (3,818 ) $ (36 ) $ 4 1. As of June 30, 2016, the Company has a 5.1% direct interest in the Goodman Europe JV as well as an indirect interest in the remaining 94.9% interest that is held through the Company’s 14.2% interest in the Gramercy European Property Fund. For the six months ended June 30, 2016, the Company recorded its equity in net income (loss) from the Goodman Europe JV and the Gramercy European Property Fund based upon its day-weighted equity interest in the entities throughout the six months, which was 80.0% for Goodman Europe JV and 19.6% for the Gramercy European Property Fund. 2. Includes the Philips JV, the Morristown JV, and European Fund Carry Co.

Debt Obligations (Tables)

Debt Obligations (Tables)	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Schedule of Mortgage Notes Payable	The following is a summary of the Company’s secured financing arrangements as of June 30, 2017 and December 31, 2016 : Property Interest Rate 1 Maturity Date Outstanding Balance June 30, 2017 December 31, 2016 Logistics Portfolio - Pool 2 2 4.48% 1/1/2018 $ 35,926 $ 36,279 Dallas, TX 3 3.05% 3/1/2018 9,429 9,540 Cincinnati, KY 3 3.29% 3/1/2018 6,552 6,628 Jacksonville, FL 3 3.05% 3/1/2018 6,773 6,852 Phoenix, AZ 3 3.05% 3/1/2018 4,073 4,120 Minneapolis, MN 3 3.05% 3/1/2018 5,932 6,001 Ames, IA 5.05% 5/1/2018 16,191 16,436 Columbus, OH 4.01% 5/31/2018 19,240 19,708 Greenwood, IN 3.59% 6/15/2018 7,347 7,436 Greenfield, IN 3.63% 6/15/2018 5,938 6,010 Logistics Portfolio - Pool 3 2 3.96% 8/1/2018 43,300 43,300 Philadelphia, PA 4.99% 1/1/2019 12,137 12,328 Columbus, OH 3.94% 1/31/2019 5,815 5,908 Bridgeview, IL 3.90% 5/1/2019 5,928 6,014 Spartanburg, SC 3.20% 6/1/2019 831 1,025 Charleston, SC 3.11% 8/1/2019 725 986 Lawrence, IN 5.02% 1/1/2020 20,385 20,703 Charlotte, NC 3.28% 1/1/2020 1,882 2,217 Hawthorne, CA 3.52% 8/1/2020 17,402 17,638 Charleston, SC 2.97% 10/1/2020 866 984 Charleston, SC 3.37% 10/1/2020 866 984 Charleston, SC 3.32% 10/1/2020 881 1,001 Charlotte, NC 3.38% 10/1/2020 751 853 Des Plaines, IL 5.54% 10/31/2020 2,425 2,463 Waco, TX 4.75% 12/19/2020 15,038 15,187 Deerfield, IL 3.71% 1/1/2021 10,628 10,804 Winston-Salem, NC 3.41% 6/1/2021 3,782 4,199 Winston-Salem, NC 3.42% 7/1/2021 1,253 1,388 Logistics Portfolio - Pool 1 2 4.27% 1/1/2022 38,600 39,002 CCC Portfolio 2 4.24% 10/6/2022 23,048 23,280 Logistics Portfolio - Pool 4 2 4.36% 12/5/2022 79,500 79,500 KIK USA Portfolio 2 4.31% 7/6/2023 7,303 7,450 Yuma, AZ 5.27% 12/6/2023 11,959 12,058 Allentown, PA 5.16% 1/6/2024 22,885 23,078 Spartanburg, SC 3.72% 2/1/2024 6,003 6,360 Durham, NC 4.02% 9/6/2024 3,664 — Charleston, SC 3.80% 2/1/2025 6,334 6,658 Hackettstown, NJ 5.49% 3/6/2026 9,519 9,550 Hutchins, TX 5.41% 6/1/2029 22,182 22,764 Buford, GA 4.67% 7/1/2017 — 15,512 Woodcliff Lake, NJ 3.04% 9/15/2017 — 35,366 KIK Canada Portfolio 2 3.57% 5/5/2019 — 7,914 Total mortgage notes payable $ 493,293 $ 555,484 Net deferred financing costs and net debt premium 2,111 3,158 Total mortgage notes payable, net $ 495,404 $ 558,642 1. Represents the interest rate as of June 30, 2017 or date of extinguishment if the mortgage note was extinguished during the period, that was recorded for financial reporting purposes, which reflects the effect of interest rate swaps and amortization of financing costs and fair market value premiums or discounts. 2. There are five properties under the Logistics Portfolio - Pool 2 mortgage, two properties under the Logistics Portfolio - Pool 3 mortgage, three properties under the Logistics Portfolio - Pool 1 mortgage, five properties under the CCC Portfolio mortgage, six properties under the Logistics Portfolio - Pool 4 mortgage, three properties under the KIK USA Portfolio mortgage, and two properties under the KIK Canada Portfolio mortgage. 3. These five mortgage notes are cross-collateralized.
Schedule of Line of Credit Facilities	The terms of the Company’s unsecured debt obligations and outstanding balances as of June 30, 2017 and December 31, 2016 are set forth in the table below: Stated Interest Rate Effective Interest Rate 1 Maturity Date Outstanding Balance June 30, 2017 December 31, 2016 2015 Revolving Credit Facility - Multicurrency tranche 1.02 % 1.02 % 1/8/2020 $ 70,955 $ 65,837 3-Year Term Loan 2.35 % 2.33 % 1/8/2019 300,000 300,000 5-Year Term Loan 2.35 % 2.70 % 1/8/2021 750,000 750,000 7-Year Term Loan 2.59 % 3.34 % 1/9/2023 175,000 175,000 2015 Senior Unsecured Notes 4.97 % 5.07 % 12/17/2024 150,000 150,000 2016 Senior Unsecured Notes 3.89 % 4.00 % 12/15/2022 150,000 150,000 2016 Senior Unsecured Notes 4.26 % 4.38 % 12/15/2025 100,000 100,000 2016 Senior Unsecured Notes 4.32 % 4.43 % 12/15/2026 100,000 100,000 Exchangeable Senior Notes 2 3.75 % 6.36 % 3/15/2019 115,000 115,000 Total unsecured debt 1,910,955 1,905,837 Net deferred financing costs and net debt discount (8,262 ) (9,704 ) Total unsecured debt, net $ 1,902,693 $ 1,896,133 1. Represents the rate at which interest expense is recorded for financial reporting purposes as of June 30, 2017 , which reflects the effect of interest rate swaps and amortization of financing costs and fair market value premiums or discounts. 2. During June 2017, the Exchangeable Senior Notes became convertible at the option of the Company and as of July 1, 2017, the Exchangeable Senior Notes are exchangeable at the option of the holders during the period from July 1, 2017 through September 30, 2017, after which their exchange right is subject to continuation based upon the prevailing exchange rate and the Company’s share prices during the exchange windows.
Schedule of Maturities of Long-term Debt	Combined aggregate principal maturities of the Company’s unsecured debt obligations, non-recourse mortgages, and Exchangeable Senior Notes, in addition to associated interest payments, as of June 30, 2017 are as follows: July 1 to December 31, 2017 2018 2019 2020 2021 Thereafter Above market interest Total 2015 Revolving Credit Facility $ — $ — $ — $ 70,955 $ — $ — $ — $ 70,955 Term Loans — — 300,000 — 750,000 175,000 — 1,225,000 Mortgage Notes Payable 1 7,375 170,819 33,672 60,103 16,364 204,960 — 493,293 Senior Unsecured Notes — — — — — 500,000 — 500,000 Exchangeable Senior Notes 2 — — 115,000 — — — — 115,000 Interest Payments 3 40,357 79,689 68,482 63,968 39,247 88,910 (6,151 ) 374,502 Total $ 47,732 $ 250,508 $ 517,154 $ 195,026 $ 805,611 $ 968,870 $ (6,151 ) $ 2,778,750 1. Mortgage note payments reflect accelerated repayment dates, when applicable, pursuant to related loan agreement. 2. During June 2017, the Exchangeable Senior Notes became convertible at the option of the Company and as of July 1, 2017, the Exchangeable Senior Notes are exchangeable at the option of the holders during the period from July 1, 2017 through September 30, 2017, after which their exchange right is subject to continuation based upon the prevailing exchange rate and the Company’s share prices during the exchange windows. 3. Interest payments do not reflect the effect of interest rate swaps.

Leasing Agreements (Tables)

Leasing Agreements (Tables)	6 Months Ended
	Jun. 30, 2017
Leases, Operating [Abstract]
Schedule of Future Minimum Rental Payments for Lease Agreements	Future minimum rental revenues under non-cancelable leases excluding reimbursements for operating expenses as of June 30, 2017 are as follows: July 1 to December 31, 2017 2018 2019 2020 2021 Thereafter Total minimum lease rental income Operating Leases $ 194,693 $ 389,118 $ 361,797 $ 332,521 $ 306,634 $ 1,581,109 $ 3,165,872

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Schedule of Carrying Value and Fair Value of Financial Instruments	The following table presents the carrying value in the financial statements and approximate fair value of assets and liabilities measured on a recurring and nonrecurring basis at June 30, 2017 and December 31, 2016 : June 30, 2017 December 31, 2016 Carrying Value Fair Value Carrying Value Fair Value Financial assets: Interest rate swaps $ 5,319 $ 5,319 $ 3,769 $ 3,769 Retained CDO Bonds $ 6,345 $ 6,345 $ 11,906 $ 11,906 Marketable securities 1 $ 100,114 $ 100,114 $ — $ — Investment in CBRE Strategic Partners Asia $ 3,995 $ 3,995 $ 4,145 $ 4,145 Real estate investments 2 $ 2,510 $ 2,510 $ 2,413 $ 2,413 Financial liabilities: Interest rate swaps $ 518 $ 518 $ 700 $ 700 Long-term debt 2015 Revolving Credit Facility 3 $ 70,955 $ 70,876 $ 65,837 $ 65,897 3-Year Term Loan 3 $ 300,000 $ 299,038 $ 300,000 $ 300,213 5-Year Term Loan 3 $ 750,000 $ 744,502 $ 750,000 $ 750,959 7-Year Term Loan 3 $ 175,000 $ 176,590 $ 175,000 $ 172,850 Mortgage notes payable 3 $ 495,404 $ 505,761 $ 558,642 $ 567,705 Senior Unsecured Notes 3 $ 496,584 $ 507,899 $ 496,464 $ 498,650 Exchangeable Senior Notes 3 $ 110,154 $ 117,879 $ 108,832 $ 115,625 1. Marketable securities represent the Company’s investment in U.S. treasury securities, which are classified in cash and cash equivalents on the Condensed Consolidated Balance Sheets. 2. Amounts as of June 30, 2017 and December 31, 2016 represent three and one real estate investments, respectively, that were impaired during the six months ended June 30, 2017 and the year ended December 31, 2016 , respectively, and were owned as of the end of the respective reporting periods. 3. Long-term debt instruments are classified as Level III due to the significance of unobservable inputs which are based upon management assumptions.
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	Assets and liabilities measured at fair value on a recurring basis and on a non-recurring basis are categorized in the table below based upon the lowest level of significant input to the valuations. At June 30, 2017 Total Level I Level II Level III Financial Assets: Retained CDO Bonds $ 6,345 $ — $ — $ 6,345 Marketable Securities 100,114 100,114 — — Real estate investments 2,510 — — 2,510 Investment in CBRE Strategic Partners Asia 3,995 — — 3,995 Interest rate swaps 5,319 — — 5,319 $ 118,283 $ 100,114 $ — $ 18,169 Financial Liabilities: Interest rate swaps $ (518 ) $ — $ — $ (518 ) $ (518 ) $ — $ — $ (518 ) At December 31, 2016 Total Level I Level II Level III Financial Assets: Retained CDO Bonds $ 11,906 $ — $ — $ 11,906 Real estate investments 2,413 — — 2,413 Investment in CBRE Strategic Partners Asia 4,145 — — 4,145 Interest rate swaps 3,769 — — 3,769 $ 22,233 $ — $ — $ 22,233 Financial Liabilities: Interest rate swaps $ (700 ) $ — $ — $ (700 ) $ (700 ) $ — $ — $ (700 )
Fair Value, Assets and Liabilities Measured on Recurring Basis, Valuation Techniques	Quantitative information regarding the valuation techniques and the range of significant unobservable Level III inputs used to determine fair value measurements on a recurring basis as of June 30, 2017 are as follows: Financial Asset (Liability) Fair Value Valuation Technique Unobservable Inputs Range Non-investment grade, subordinate CDO bonds $ 6,345 Discounted cash flows Discount rate 16.5% Interest rate swaps 1 $ 4,801 Hypothetical derivative method Credit borrowing spread 135 to 210 basis points Investment in CBRE Strategic Partners Asia $ 3,995 Discounted cash flows Discount rate 20.0% 1. Fair value includes interest rate swap liabilities with an aggregate value of $(518) .
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation	The following rollforward table reconciles the beginning and ending balances of financial assets (liabilities) measured at fair value on a recurring basis using Level III inputs as of June 30, 2017 : Retained CDO Bonds Investment in CBRE Strategic Partners Asia Interest Rate Swaps Total Financial Assets (Liabilities) - Level III Balance at January 1, 2017 $ 11,906 $ 4,145 $ 3,069 $ 19,120 Amortization of discounts or premiums 898 — — 898 Adjustments to fair value: Ineffective portion of change in derivative instruments — — 46 46 Unrealized gain on derivatives — — 1,686 1,686 Unrealized loss in other comprehensive income from fair value adjustment (1,569 ) — — (1,569 ) Other-than-temporary impairments (4,890 ) — — (4,890 ) Total loss on fair value adjustments — (150 ) — (150 ) Balance at June 30, 2017 $ 6,345 $ 3,995 $ 4,801 $ 15,141
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation	The following rollforward table reconciles the beginning and ending balances of financial assets (liabilities) measured at fair value on a recurring basis using Level III inputs as of June 30, 2017 : Retained CDO Bonds Investment in CBRE Strategic Partners Asia Interest Rate Swaps Total Financial Assets (Liabilities) - Level III Balance at January 1, 2017 $ 11,906 $ 4,145 $ 3,069 $ 19,120 Amortization of discounts or premiums 898 — — 898 Adjustments to fair value: Ineffective portion of change in derivative instruments — — 46 46 Unrealized gain on derivatives — — 1,686 1,686 Unrealized loss in other comprehensive income from fair value adjustment (1,569 ) — — (1,569 ) Other-than-temporary impairments (4,890 ) — — (4,890 ) Total loss on fair value adjustments — (150 ) — (150 ) Balance at June 30, 2017 $ 6,345 $ 3,995 $ 4,801 $ 15,141

Derivatives and Non-Derivativ34

Derivatives and Non-Derivative Hedging Instruments (Tables)	6 Months Ended
	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	The Company’s derivatives and hedging instruments as of June 30, 2017 are as follows: Benchmark Rate Notional Value Strike Rate Effective Date Expiration Date Fair Value Interest Rate Swap - Waco 1 mo. USD-LIBOR-BBA 15,038 USD 4.55% 12/19/2013 12/19/2020 $ (358 ) Interest Rate Swap - Atrium I 1 mo. USD-LIBOR-BBA 19,240 USD 1.78% 8/16/2011 5/31/2018 (108 ) Interest Rate Swap - Easton III 1 mo. USD-LIBOR-BBA 5,815 USD 1.95% 8/16/2011 1/31/2019 (52 ) Interest Rate Swap - 3-Year Term Loan 1 mo. USD-LIBOR-BBA 100,000 USD 1.22% 12/19/2016 12/17/2018 366 Interest Rate Swap - 3-Year Term Loan 1 mo. USD-LIBOR-BBA 100,000 USD 1.23% 12/19/2016 12/17/2018 360 Interest Rate Swap - 3-Year Term Loan 1 mo. USD-LIBOR-BBA 100,000 USD 1.24% 12/19/2016 12/17/2018 344 Interest Rate Swap - 5-Year Term Loan 1 mo. USD-LIBOR-BBA 750,000 USD 1.60% 12/17/2015 12/17/2020 3,566 Interest Rate Swap - 7-Year Term Loan 1 mo. USD-LIBOR-BBA 175,000 USD 1.82% 12/17/2015 1/9/2023 683 Net Investment Hedge in EUR-denominated investments USD-EUR exchange rate 45,000 EUR N/A 9/28/2015 N/A — Net Investment Hedge in GBP-denominated investments USD-GBP exchange rate 15,000 GBP N/A 7/15/2016 N/A — Total hedging instruments $ 4,801

Shareholders' Equity (Deficit35

Shareholders' Equity (Deficit) of the Company (Tables)	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Dividends Declared	During the six months ended June 30, 2017 , the Company’s common dividends are as follows: Quarter Ended Record Date Payment Date Common dividend per share March 31, 2017 3/31/2017 4/14/2017 $0.375 June 30, 2017 6/30/2017 7/14/2017 $0.375
Schedule of Calculation of Numerator and Denominator in Earnings Per Share	Earnings per share for the three and six months ended June 30, 2017 and 2016 are computed as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Numerator – Income (loss): Net income (loss) from continuing operations $ 5,985 $ 23,565 $ (2,087 ) $ 17,872 Net income (loss) from discontinued operations (28 ) 58 (52 ) 4,698 Net income (loss) before net gain on disposals 5,957 23,623 (2,139 ) 22,570 Net gain on disposals 2,002 — 19,379 — Gain on sale of European unconsolidated equity investment interests held with a related party — 5,341 — 5,341 Net income 7,959 28,964 17,240 27,911 Less: Net (income) loss attributable to noncontrolling interest 113 (51 ) (41 ) 69 Less: Nonforfeitable dividends allocated to participating shareholders (337 ) (201 ) (635 ) (400 ) Less: Preferred share dividends (1,558 ) (1,558 ) (3,117 ) (3,117 ) Net income available to common shares outstanding $ 6,177 $ 27,154 $ 13,447 $ 24,463 Denominator – Weighted average shares 1 : Basic weighted average shares outstanding 148,542,916 140,776,976 144,746,251 140,664,885 Effect of dilutive securities: Unvested non-participating share based payment awards 86,452 604,464 79,552 604,464 Options 19,196 14,539 14,471 10,392 Outside interests in the Operating Partnership — 402,769 — 430,435 Exchangeable Senior Notes 1,265,879 715,454 1,125,662 378,414 Diluted weighted average shares outstanding 149,914,443 142,514,202 145,965,936 142,088,590 1. Share and per share amounts have been adjusted for the 1-for-3 reverse share split completed on December 30, 2016. The Operating Partnership's earnings per unit for the three and six months ended June 30, 2017 and 2016 are computed as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Numerator – Income (loss): Net income (loss) from continuing operations $ 5,985 $ 23,565 $ (2,087 ) $ 17,872 Net income (loss) from discontinued operations (28 ) 58 (52 ) 4,698 Net income (loss) before net gain on disposals 5,957 23,623 (2,139 ) 22,570 Net gain on disposals 2,002 — 19,379 — Gain on sale of European unconsolidated equity investment interests held with a related party — 5,341 — 5,341 Net income 7,959 28,964 17,240 27,911 Less: Net loss attributable to noncontrolling interest in other partnerships 137 27 17 139 Less: Nonforfeitable dividends allocated to participating unitholders (337 ) (201 ) (635 ) (400 ) Less: Preferred unit distributions (1,558 ) (1,558 ) (3,117 ) (3,117 ) Net income available to common units outstanding $ 6,201 $ 27,232 $ 13,505 $ 24,533 Denominator – Weighted average units 1 : Basic weighted average units outstanding 149,103,359 141,179,745 145,336,798 141,095,320 Effect of dilutive securities: Unvested non-participating share based payment awards 86,452 604,464 79,552 604,464 Options 19,196 14,539 14,471 10,392 Exchangeable Senior Notes 1,265,879 715,454 1,125,662 378,414 Diluted weighted average units outstanding 150,474,886 142,514,202 146,556,483 142,088,590 1. Share and per share amounts have been adjusted for the 1-for-3 reverse unit split completed on December 30, 2016.
Schedule of Accumulated Other Comprehensive Income (Loss)	Accumulated other comprehensive income (loss) as of June 30, 2017 and December 31, 2016 is comprised of the following: June 30, 2017 December 31, 2016 Net unrealized gain (loss) on derivative securities $ 1,246 $ (440 ) Net unrealized gain on debt instruments 2,130 3,699 Foreign currency translation adjustments: Net gain (loss) on non-derivative net investment hedges 1 (603 ) 4,516 Other foreign currency translation adjustments (6,109 ) (13,045 ) Reclassification of swap gain into interest expense 1,681 1,142 Total accumulated other comprehensive loss $ (1,655 ) $ (4,128 ) 1. The foreign currency translation adjustment associated with the Company’s non-derivative net investment hedges related to its European investments is included in other comprehensive income (loss). The balance reflects a $652 write-off on the Company’s non-derivative net investment hedge during the year ended December 31, 2016.

Partners' Capital of the Oper36

Partners' Capital of the Operating Partnership (Tables)	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Schedule of Calculation of Numerator and Denominator in Earnings Per Share	Earnings per share for the three and six months ended June 30, 2017 and 2016 are computed as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Numerator – Income (loss): Net income (loss) from continuing operations $ 5,985 $ 23,565 $ (2,087 ) $ 17,872 Net income (loss) from discontinued operations (28 ) 58 (52 ) 4,698 Net income (loss) before net gain on disposals 5,957 23,623 (2,139 ) 22,570 Net gain on disposals 2,002 — 19,379 — Gain on sale of European unconsolidated equity investment interests held with a related party — 5,341 — 5,341 Net income 7,959 28,964 17,240 27,911 Less: Net (income) loss attributable to noncontrolling interest 113 (51 ) (41 ) 69 Less: Nonforfeitable dividends allocated to participating shareholders (337 ) (201 ) (635 ) (400 ) Less: Preferred share dividends (1,558 ) (1,558 ) (3,117 ) (3,117 ) Net income available to common shares outstanding $ 6,177 $ 27,154 $ 13,447 $ 24,463 Denominator – Weighted average shares 1 : Basic weighted average shares outstanding 148,542,916 140,776,976 144,746,251 140,664,885 Effect of dilutive securities: Unvested non-participating share based payment awards 86,452 604,464 79,552 604,464 Options 19,196 14,539 14,471 10,392 Outside interests in the Operating Partnership — 402,769 — 430,435 Exchangeable Senior Notes 1,265,879 715,454 1,125,662 378,414 Diluted weighted average shares outstanding 149,914,443 142,514,202 145,965,936 142,088,590 1. Share and per share amounts have been adjusted for the 1-for-3 reverse share split completed on December 30, 2016. The Operating Partnership's earnings per unit for the three and six months ended June 30, 2017 and 2016 are computed as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Numerator – Income (loss): Net income (loss) from continuing operations $ 5,985 $ 23,565 $ (2,087 ) $ 17,872 Net income (loss) from discontinued operations (28 ) 58 (52 ) 4,698 Net income (loss) before net gain on disposals 5,957 23,623 (2,139 ) 22,570 Net gain on disposals 2,002 — 19,379 — Gain on sale of European unconsolidated equity investment interests held with a related party — 5,341 — 5,341 Net income 7,959 28,964 17,240 27,911 Less: Net loss attributable to noncontrolling interest in other partnerships 137 27 17 139 Less: Nonforfeitable dividends allocated to participating unitholders (337 ) (201 ) (635 ) (400 ) Less: Preferred unit distributions (1,558 ) (1,558 ) (3,117 ) (3,117 ) Net income available to common units outstanding $ 6,201 $ 27,232 $ 13,505 $ 24,533 Denominator – Weighted average units 1 : Basic weighted average units outstanding 149,103,359 141,179,745 145,336,798 141,095,320 Effect of dilutive securities: Unvested non-participating share based payment awards 86,452 604,464 79,552 604,464 Options 19,196 14,539 14,471 10,392 Exchangeable Senior Notes 1,265,879 715,454 1,125,662 378,414 Diluted weighted average units outstanding 150,474,886 142,514,202 146,556,483 142,088,590 1. Share and per share amounts have been adjusted for the 1-for-3 reverse unit split completed on December 30, 2016.

Noncontrolling Interests (Table

Noncontrolling Interests (Tables)	6 Months Ended
	Jun. 30, 2017
Noncontrolling Interest [Abstract]
Noncontrolling Interest in the Operating Partnership	Below is the rollforward of the activity relating to the noncontrolling interests in the Operating Partnership as of June 30, 2017 : Noncontrolling Interest Balance at January 1, 2017 $ 8,643 Redemption of noncontrolling interests in the Operating Partnership (2,697 ) Net income attribution 58 Fair value adjustments 576 Dividends (168 ) Balance at June 30, 2017 $ 6,412

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments	Future minimum rental payments to be made by the Company under these non-cancelable ground leases, excluding increases resulting from increases in the consumer price index, are as follows: July 1 to December 31, 2017 2018 2019 2020 2021 Thereafter Total Ground Leases - Operating $ 1,123 $ 2,262 $ 2,271 $ 2,263 $ 2,231 $ 61,857 $ 72,007 Ground Leases - Capital — 1 — — — 329 330 Total $ 1,123 $ 2,263 $ 2,271 $ 2,263 $ 2,231 $ 62,186 $ 72,337

Supplemental Cash Flow Inform39

Supplemental Cash Flow Information (Tables)	6 Months Ended
	Jun. 30, 2017
Supplemental Cash Flow Elements [Abstract]
Schedule of Supplemental Cash Flow Activities	The following table represents supplemental cash flow disclosures for the six months ended June 30, 2017 and 2016 : Six Months Ended June 30, 2017 2016 Supplemental cash flow disclosures: Interest paid $ 44,441 $ 40,639 Income taxes paid $ 296 $ 743 Proceeds from 1031 exchanges from sale of real estate $ 170,210 $ 270,429 Use of funds from 1031 exchanges for acquisitions of real estate $ (140,987 ) $ (227,521 ) Non-cash activity: Fair value adjustment to noncontrolling interest in the Operating Partnership $ 576 $ 2,159 Debt assumed in acquisition of real estate $ 3,680 $ 45,958 Debt transferred in disposition of real estate $ (10,456 ) $ (101,432 ) Non-cash acquisition of consolidated VIE $ 24,930 $ — Dividend reinvestment plan proceeds $ 103 $ — Distribution of real estate assets from unconsolidated equity investment $ — $ 263,015 Redemption of units of noncontrolling interest in the Operating Partnership for common shares $ (2,697 ) $ (2,204 )

Business and Organization (Narr

Business and Organization (Narrative) (Details) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2017USD ($)ft²buildingProperty	Mar. 31, 2017Property	Jun. 30, 2016Property	Jun. 30, 2017USD ($)ft²buildingProperty	Jun. 30, 2017USD ($)ft²buildingProperty	Jun. 30, 2017USD ($)ft²buildingPropertyland_parcel	Jun. 30, 2017USD ($)ft²buildingProperty	Jun. 30, 2016Property	Dec. 31, 2016USD ($)Property
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Number of Properties | Property	54			54	54	54	54		46
Number of Acquisitions		21			19	2
Square Feet | ft²							4,750,354
Purchase Price				$ 302,412
Acquisition of land				6,840
Buildings	$ 4,118,785			4,118,785	$ 4,118,785	$ 4,118,785	$ 4,118,785		$ 4,053,125
Number of real estate properties sold | Property			4					10
Proceeds from sale of property held-for-sale				$ 234,985
Wholly Owned Properties [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Number of Properties | building	320			320	320	320	320
Area of real estate property | ft²	67,485,724			67,485,724	67,485,724	67,485,724	67,485,724
Occupancy rate	97.70%			97.70%	97.70%	97.70%	97.70%
Unconsolidated Properties [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Number of Properties | Property	52			52	52	52	52
GPT Operating Partnership LP [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Ownership percentage by noncontrolling owners	0.36%			0.36%	0.36%	0.36%	0.36%
Buildings	$ 4,118,785			$ 4,118,785	$ 4,118,785	$ 4,118,785	$ 4,118,785		$ 4,053,125
Gramercy Asset Management [Member] | Commercial Lease Properties [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Commercial real estate assets	1,341,000			1,341,000	1,341,000	1,341,000	1,341,000
Europe [Member] | Gramercy Asset Management [Member] | Commercial Lease Properties [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Commercial real estate assets	$ 1,048,000			$ 1,048,000	$ 1,048,000	$ 1,048,000	$ 1,048,000
CBRE Strategic Partners Asia [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Number of Properties | Property	2			2	2	2	2		2
Consolidated VIE [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Purchase Price				$ 29,605
Land [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Purchase Price				2,400
Industrial Facility [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Number of Acquisitions | land_parcel						2
Acquisition of land				2,800
Buildings	$ 49,077			$ 49,077	$ 49,077	$ 49,077	$ 49,077
Disposed by Sale [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Number of real estate properties sold | Property	10				17
Area of real estate properties sold | ft²							2,227,753
Disposed by Sale [Member] | Offices [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Number of real estate properties sold | Property					2

Significant Accounting Polici41

Significant Accounting Policies (Narrative) (Details)	Jun. 29, 2017segment	Jun. 30, 2017USD ($)Propertyentity	Jun. 30, 2016USD ($)	Jun. 30, 2017USD ($)Propertysegmententity	Jun. 30, 2016USD ($)	Dec. 31, 2016USD ($)Propertyentity	Dec. 31, 2015USD ($)entity
Accounting Policies [Line Items]
Restricted cash		$ 40,326,000		$ 40,326,000		$ 12,904,000
Number of consolidated VIEs | entity		2		2		3
Number of unconsolidated variable interest entities | entity		3		3		4	4
Allowance for doubtful accounts receivable		$ 523,000		$ 523,000		$ 57,000
Amortization of intangible assets		24,167,000	$ 29,615,000	48,339,000	$ 57,175,000
Amortization of off market lease unfavorable and off market lease favorable		4,756,000	5,629,000	5,377,000	5,810,000
Amortization of ground rent intangible assets and liabilities		2,435,000	5,591,000	5,519,000	10,112,000
Incentive fee recognized		$ 0	14,217,000	$ 1,449,000	15,190,000
Number of Properties | Property		54		54		46
Foreign currency translation gain (loss)		$ 1,126,000	(8,686,000)	$ 1,817,000	(2,567,000)
Foreign currency transaction gain (loss), realized		66,000	(186,000)	57,000	(81,000)
Impairment of goodwill		0	$ 0	$ 0	$ 0
Number of operating segments | segment	2			1
Available-for-sale Securities [Member]
Accounting Policies [Line Items]
Retained collateralized debt obligations (CDOs) bonds, other-than-temporary impairment		$ 0		$ 4,890,000
Bank Of America [Member] | Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member]
Accounting Policies [Line Items]
Concentration risk, percentage		10.50%	15.20%		12.80%
Bank Of America [Member] | Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] | Below-market lease liabilities [Member]
Accounting Policies [Line Items]
Concentration risk, percentage		5.40%	7.90%		5.40%
Proportion Foods [Member]
Accounting Policies [Line Items]
Percentage of area leased property		100.00%		100.00%
Gramercy Europe Asset [Member] | Canada [Member]
Accounting Policies [Line Items]
Number of Properties | Property		2		2
Gramercy Europe Asset [Member] | United Kingdom [Member]
Accounting Policies [Line Items]
Number of Properties | Property		1		1
Restatement Adjustment [Member]
Accounting Policies [Line Items]
Investment income reclassified			$ 503,000		$ 946,000
Gramercy Europe Limited [Member]
Accounting Policies [Line Items]
Goodwill		$ 3,100,000		$ 3,100,000		$ 2,988,000	$ 3,802,000
Ground Lease [Member]
Accounting Policies [Line Items]
Reduction of other property operating expense for ground rent intangible assets and liabilities		$ (22,000)	$ 8,000
Amortization of ground rent intangible assets and liabilities				$ (43,000)	$ 17,000
Building [Member]
Accounting Policies [Line Items]
Property, plant and equipment, useful life				40 years
Building Equipment and Fixtures [Member] | Minimum [Member]
Accounting Policies [Line Items]
Property, plant and equipment, useful life				5 years
Building Equipment and Fixtures [Member] | Maximum [Member]
Accounting Policies [Line Items]
Property, plant and equipment, useful life				10 years

Significant Accounting Polici42

Significant Accounting Policies (Schedule of Variable Interest Entities) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Retained CDO Bonds [Member]
Unconsolidated VIEs:
Company carrying value-assets, unconsolidated	$ 6,345	$ 11,906
Company carrying value - liabilities, unconsolidated	0	0
Face value of assets held by the VIEs, unconsolidated	135,640	391,990
Face value of liabilities issued by the VIEs, unconsolidated	113,252	592,414
Operating Partnership [Member]
Consolidated VIEs:
Company carrying value-assets, consolidated	5,686,906	5,603,527
Company carrying value - liabilities, consolidated	2,722,775	2,842,493
Face value of assets held by the VIEs, consolidated	5,686,906	5,603,527
Face value of liabilities issued by the VIEs, consolidated	2,722,775	2,842,493
Proportion Foods [Member]
Consolidated VIEs:
Company carrying value-assets, consolidated		22,836
Company carrying value - liabilities, consolidated		3,041
Face value of assets held by the VIEs, consolidated		22,836
Face value of liabilities issued by the VIEs, consolidated		23,514
Gramercy Europe Asset Management - European Fund Manager [Member]
Consolidated VIEs:
Company carrying value-assets, consolidated	1,348	1,100
Company carrying value - liabilities, consolidated	25	47
Face value of assets held by the VIEs, consolidated	1,348	1,100
Face value of liabilities issued by the VIEs, consolidated	2,073	1,742
Gramercy Europe Asset Management - European Fund Carry Co [Member]
Unconsolidated VIEs:
Company carrying value-assets, unconsolidated	5	8
Company carrying value - liabilities, unconsolidated	0	0
Face value of assets held by the VIEs, unconsolidated	18	31
Face value of liabilities issued by the VIEs, unconsolidated	$ 0	$ 0

Significant Accounting Polici43

Significant Accounting Policies (Schedule of Intangible Assets and Acquired Lease Obligations) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Intangible assets:
Total intangible assets	$ 563,231	$ 618,680
Finite-lived intangible assets, accumulated amortization	174,792	133,710
Intangible liabilities:
Total intangible liabilities	175,635	230,183
In-place leases [Member]
Intangible assets:
Total intangible assets	506,094	553,924
Finite-lived intangible assets, accumulated amortization	154,831	117,717
Above-market lease assets [Member]
Intangible assets:
Total intangible assets	53,730	59,647
Finite-lived intangible assets, accumulated amortization	20,080	15,719
Below-market ground rent [Member]
Intangible assets:
Total intangible assets	5,046	5,109
Finite-lived intangible assets, accumulated amortization	337	274
Below-market lease liabilities [Member]
Intangible liabilities:
Total intangible liabilities	176,453	223,110
Finite-lived intangible liabilities, accumulated amortization	26,766	26,168
Above-market ground rent [Member]
Intangible liabilities:
Total intangible liabilities	6,946	7,073
Finite-lived intangible liabilities, accumulated amortization	355	248
Assets Held-for-sale [Member]
Intangible assets:
Amounts related to assets held for sale, net of accumulated amortization of $456 and $0	(1,639)	0
Finite-lived intangible assets, accumulated amortization	456	0
Intangible liabilities:
Amounts related to liabilities of assets held for sale, net of accumulated amortization of $1,030 and $0	(7,764)	0
Finite-lived intangible liabilities, accumulated amortization	$ 1,030	$ 0

Significant Accounting Polici44

Significant Accounting Policies (Schedule of Finite-Lived Intangible Assets, Future Amortization Expense) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)
Depreciation and Amortization Expense [Member]
Finite-Lived Intangible Assets
July 1 to December 31, 2017	$ 45,302
2,018	85,600
2,019	71,830
2,020	58,645
2,021	50,813
Rental Revenue [Member]
Finite-Lived Intangible Assets, Amortization Expense And Below Market Leases, Amortized Income
July 1 to December 31, 2017	(92)
2,018	(548)
2,019	(1,410)
2,020	(3,209)
2,021	(4,271)
Property Operating Expense [Member]
Finite-Lived Intangible Assets, Amortization Expense And Below Market Leases, Amortized Income
July 1 to December 31, 2017	(43)
2,018	(87)
2,019	(87)
2,020	(87)
2,021	$ (87)
In-place leases [Member]
Schedule of Finite Lived Intangible Assets Future Amortization Expense [Line Items]
Weighted-Average Amortization Period (years)	9 years 2 months 12 days
In-place leases [Member] | Depreciation and Amortization Expense [Member]
Finite-Lived Intangible Assets
July 1 to December 31, 2017	$ 45,302
2,018	85,600
2,019	71,830
2,020	58,645
2,021	$ 50,813
Above-market lease assets [Member]
Schedule of Finite Lived Intangible Assets Future Amortization Expense [Line Items]
Weighted-Average Amortization Period (years)	7 years 2 months 12 days
Above-market lease assets [Member] | Rental Revenue [Member]
Finite-Lived Intangible Assets
July 1 to December 31, 2017	$ 5,512
2,018	10,574
2,019	9,377
2,020	7,255
2,021	$ 6,043
Below-market lease liabilities [Member]
Schedule of Finite Lived Intangible Assets Future Amortization Expense [Line Items]
Weighted-Average Amortization Period (years)	18 years 8 months 12 days
Below-market lease liabilities [Member] | Rental Revenue [Member]
Below Market Lease
July 1 to December 31, 2017	$ (5,604)
2,018	(11,122)
2,019	(10,787)
2,020	(10,464)
2,021	$ (10,314)
Below-market ground rent [Member]
Schedule of Finite Lived Intangible Assets Future Amortization Expense [Line Items]
Weighted-Average Amortization Period (years)	40 years 10 months 25 days
Below-market ground rent [Member] | Property Operating Expense [Member]
Finite-Lived Intangible Assets
July 1 to December 31, 2017	$ 64
2,018	127
2,019	127
2,020	127
2,021	$ 127
Above-market ground rent [Member]
Schedule of Finite Lived Intangible Assets Future Amortization Expense [Line Items]
Weighted-Average Amortization Period (years)	32 years 8 months 12 days
Above-market ground rent [Member] | Property Operating Expense [Member]
Finite-Lived Intangible Assets, Amortization Expense And Below Market Leases, Amortized Income
July 1 to December 31, 2017	$ (107)
2,018	(214)
2,019	(214)
2,020	(214)
2,021	$ (214)

Significant Accounting Polici45

Significant Accounting Policies (Schedule of Retained Collateralized Debt Obligation Bonds) (Details) - Available-for-sale Securities [Member] $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017USD ($)security	Jun. 30, 2017USD ($)security
Schedule of Available-for-sale Securities [Line Items]
Number of Securities | security	6	6
Face Value	$ 322,006	$ 322,006
Amortized Cost	4,215	4,215
Gross Unrealized Gain		2,130
Other-than-temporary impairment	0	(4,890)
Fair Value	$ 6,345	$ 6,345
Weighted Average Expected Life		1 year 7 months 6 days

Significant Accounting Polici46

Significant Accounting Policies (Other Than Temporary Impairment Credit Losses Recognized in Earnings) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 2,752,712
Reduction for credit losses:
Ending balance	2,958,082
OTTI on Retained CDO Bonds [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(491)	$ 3,196
Additions to credit losses:
On Retained CDO Bonds for which an OTTI was not previously recognized	0	0
On Retained CDO Bonds for which an OTTI was previously recognized and a portion of an OTTI was recognized in other comprehensive income (loss)	4,890	0
On Retained CDO Bonds for which an OTTI was previously recognized without any portion of OTTI recognized in other comprehensive income (loss)	0	0
Reduction for credit losses:
On Retained CDO Bonds for which no OTTI was recognized in other comprehensive income at current measurement date	0	0
On Retained CDO Bonds sold during the period	0	0
On Retained CDO Bonds charged off during the period	0	0
For increases in cash flows expected to be collected that are recognized over the remaining life of the Retained CDO Bonds	(1,691)	(3,687)
Ending balance	$ 2,708	$ (491)

Dispositions, Assets Held for47

Dispositions, Assets Held for Sale, and Discontinued Operations (Narrative) (Details)	3 Months Ended			6 Months Ended
	Jun. 30, 2017USD ($)Property	Mar. 31, 2017Property	Jun. 30, 2016USD ($)Property	Jun. 30, 2017USD ($)	Jun. 30, 2017USD ($)Property	Jun. 30, 2017USD ($)land_parcel	Jun. 30, 2017USD ($)ft²	Jun. 30, 2016USD ($)Property	Jun. 30, 2017Property	Jun. 30, 2017land_parcel	Dec. 31, 2016Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties sold | Property			4					10
Proceeds from sale of property held-for-sale				$ 234,985,000
Net gain on disposals	$ 2,002,000		$ 0	19,379,000				$ 0
Gain on disposal			0					0
Properties sold at a gain | Property	8				15
Impairment of real estate investments	$ 5,580,000			18,351,000
Impairment charge	$ (5,052,000)
Number of Acquisitions		21			19	2
Disposed by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties sold | Property	10				17
Area of real estate properties sold | ft²							2,227,753
Impairment of real estate investments	$ 2,523,000		$ 0					$ 0
Assets Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate properties impaired during period | Property					3
Number of properties held-for-sale									4	1	0
Net asset value	$ 6,781,000			6,781,000	$ 6,781,000	$ 6,781,000	$ 6,781,000
Exchange of Productive Assets [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties sold | Property					8
Proceeds from sale of property held-for-sale				170,202,000
Purchase price of real estate				$ 140,985,000
Number of Acquisitions | Property					9
Offices [Member] | Disposed by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties sold | Property					2

Dispositions, Assets Held for48

Dispositions, Assets Held for Sale, and Discontinued Operations (Summary of Assets and Liabilities Held-for-sale) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets held for sale
Total assets	$ 14,741	$ 0
Liabilities related to assets held for sale
Total liabilities	7,960	0
Assets Held-for-sale [Member]
Assets held for sale
Real estate investments	13,018
Acquired lease assets, net	1,639	0
Other assets	84
Total assets	14,741
Liabilities related to assets held for sale
Below-market lease liabilities, net	7,764	$ 0
Other liabilities	196
Total liabilities	7,960
Net assets held for sale	$ 6,781

Dispositions, Assets Held for49

Dispositions, Assets Held for Sale, and Discontinued Operations (Schedule of Operating Results of Assets Held-for-sale Including Discontinued Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on extinguishment of debt	$ 0	$ 0	$ 0	$ 1,930
Income (loss) from discontinued operations	(28)	58	(52)	4,698
Assets Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	3	140	(3)	5,997
Operating expenses	0	(56)	6	(2,236)
General and administrative expense	(31)	(26)	(55)	(38)
Interest expense	0	0	0	(955)
Gain on extinguishment of debt	0	0	0	1,930
Income (loss) from discontinued operations	$ (28)	$ 58	$ (52)	$ 4,698

Dispositions, Assets Held for50

Dispositions, Assets Held for Sale, and Discontinued Operations (Schedule of Significant Operating and Investing Noncash Transactions) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Increase in cash and cash equivalents related to foreign currency translation	$ (78)	$ 131
Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Significant operating noncash items	0	(9,452)
Increase in cash and cash equivalents related to foreign currency translation	0	1,045
Total	$ 0	$ (8,407)

Real Estate Investments (Narrat

Real Estate Investments (Narrative) (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2017Property	Jun. 30, 2017USD ($)	Jun. 30, 2017USD ($)Property	Jun. 30, 2017USD ($)land_parcel	Jun. 30, 2017USD ($)ft²	Mar. 31, 2018USD ($)	Oct. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Business Acquisition [Line Items]
Number of Acquisitions	21		19	2
Square Feet | ft²					4,750,354
Purchase Price		$ 302,412
Acquisition of land		6,840
Buildings		4,118,785	$ 4,118,785	$ 4,118,785	$ 4,118,785			$ 4,053,125
Consolidated VIE [Member]
Business Acquisition [Line Items]
Purchase Price		29,605
Land [Member]
Business Acquisition [Line Items]
Purchase Price		2,400
Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Real estate assets		277,979	277,979	277,979	277,979
Intangible Assets		29,892	29,892	29,892	29,892
Intangible Liabilities		2,709	2,709	$ 2,709	2,709
Industrial Facility [Member]
Business Acquisition [Line Items]
Number of Acquisitions | land_parcel				2
Acquisition of land		2,800
Buildings		$ 49,077	$ 49,077	$ 49,077	$ 49,077
Scenario, Forecast [Member] | Industrial Facility [Member]
Business Acquisition [Line Items]
Buildings						$ 23,272	$ 25,805

Real Estate Investments (Proper

Real Estate Investments (Property Purchase Price Allocation) (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2017Property	Jun. 30, 2017USD ($)	Jun. 30, 2017USD ($)Property	Jun. 30, 2017USD ($)land_parcel
Real Estate Properties [Line Items]
Number of Acquisitions	21		19	2
2016 Acquisitions Finalized [Member]
Real Estate Properties [Line Items]
Real Estate Assets		$ 513,087	$ 513,087	$ 513,087
Intangible Assets		60,627	60,627	60,627
Intangible Liabilities		10,205	10,205	10,205
Decrease to Rental Revenue		27
Increase to Depreciation and Amortization Expense		16
Preliminary Allocations [Member] | 2016 Acquisitions Finalized [Member]
Real Estate Properties [Line Items]
Real Estate Assets		513,424	513,424	513,424
Intangible Assets		61,178	61,178	61,178
Intangible Liabilities		$ 11,093	$ 11,093	$ 11,093

Unconsolidated Equity Investm53

Unconsolidated Equity Investments (Narrative) (Details) € in Thousands, $ in Thousands	Jun. 30, 2016Property	Jul. 31, 2017	Sep. 30, 2016Property	Jun. 30, 2017USD ($)ft²Propertyentityextension	Mar. 31, 2017Property	Jun. 30, 2016	Jun. 30, 2017USD ($)ft²Propertyentityextension	Jun. 30, 2017USD ($)ft²Propertyentityextension	Jun. 30, 2017USD ($)ft²Propertyentityextension	Jun. 30, 2017USD ($)ft²Propertyland_parcelentityextension	Jun. 30, 2017EUR (€)	Jun. 30, 2016USD ($)	Dec. 31, 2016Propertyentity	Jun. 30, 2017EUR (€)ft²Propertyentityextension	Dec. 31, 2015entity	Oct. 31, 2015
Investments in and Advances to Affiliates [Line Items]
Number of unconsolidated variable interest entities | entity				3			3	3	3	3			4	3	4
Contributions to unconsolidated equity investments | $								$ 7,400
Distributions received from unconsolidated equity investments | $								$ 689				$ 13,775
Number of Acquisitions					21				19	2
Number of Properties				54			54	54	54	54			46	54
Gramercy Europe Committed [Member]
Investments in and Advances to Affiliates [Line Items]
Initial equity capital available				$ 395,213			$ 395,213	$ 395,213	$ 395,213	$ 395,213				€ 352,500
Gramercy European Property Fund [Member]
Investments in and Advances to Affiliates [Line Items]
Ownership %				14.20%			14.20%	14.20%	14.20%	14.20%			14.20%	14.20%
Initial equity capital available				$ 14,283			$ 14,283	$ 14,283	$ 14,283	$ 14,283				€ 12,500
Contributions to unconsolidated equity investments								$ 55,892			€ 50,000
Number of Properties				30			30	30	30	30			26	30
Commitment amount | $				$ 57,130			$ 57,130	$ 57,130	$ 57,130	$ 57,130
Voting Interest %				14.20%			14.20%	14.20%	14.20%	14.20%				14.20%
Goodman Europe JV [Member]
Investments in and Advances to Affiliates [Line Items]
Ownership %	80.00%			5.10%		80.00%	5.10%	5.10%	5.10%	5.10%		80.00%	5.10%	5.10%
Distributions received from unconsolidated equity investments | $				$ 337				$ 689
Number of Acquisitions									4				13
Number of Properties				8			8	8	8	8			8	8
Voting Interest %				5.10%			5.10%	5.10%	5.10%	5.10%				5.10%
Strategic Office Partners [Member]
Investments in and Advances to Affiliates [Line Items]
Ownership %				25.00%			25.00%	25.00%	25.00%	25.00%				25.00%
Contributions to unconsolidated equity investments | $				$ 4,750				$ 7,400
Number of Properties				10			10	10	10	10			6	10
Number of properties contributed			4
Commitment amount | $				$ 400,000			$ 400,000	$ 400,000	$ 400,000	$ 400,000
Remaining commitment amount | $				$ 76,573			$ 76,573	$ 76,573	$ 76,573	$ 76,573
Voting Interest %				25.00%			25.00%	25.00%	25.00%	25.00%				25.00%
Strategic Office Partners [Member] | Parent Company [Member]
Investments in and Advances to Affiliates [Line Items]
Commitment amount | $				$ 100,000			$ 100,000	$ 100,000	$ 100,000	$ 100,000
Duke JV [Member]
Investments in and Advances to Affiliates [Line Items]
Number of Acquisitions	7
CBRE Strategic Partners Asia [Member]
Investments in and Advances to Affiliates [Line Items]
Ownership %				5.07%			5.07%	5.07%	5.07%	5.07%				5.07%
Number of Properties				2			2	2	2	2			2	2
Term of agreement							8 years
Number of extensions | extension				2			2	2	2	2				2
Term of extensions							1 year
Voting Interest %				5.07%			5.07%	5.07%	5.07%	5.07%				5.07%
Phillips JV [Member]
Investments in and Advances to Affiliates [Line Items]
Ownership %				25.00%			25.00%	25.00%	25.00%	25.00%				25.00%
Area of real estate property | ft²				199,900			199,900	199,900	199,900	199,900				199,900
Percentage of occupancy for leased office and industrial property				100.00%			100.00%	100.00%	100.00%	100.00%				100.00%
Morristown JV [Member]
Investments in and Advances to Affiliates [Line Items]
Ownership %				50.00%			50.00%	50.00%	50.00%	50.00%			50.00%	50.00%
Number of Properties				1			1	1	1	1			1	1
Voting Interest %				50.00%			50.00%	50.00%	50.00%	50.00%				50.00%		50.00%
Duke Realty [Member]
Investments in and Advances to Affiliates [Line Items]
Number of Acquisitions	1
Gramercy European Property Fund [Member] | Goodman Europe JV [Member]
Investments in and Advances to Affiliates [Line Items]
Ownership percentage acquired						74.90%
Ownership %				94.90%			94.90%	94.90%	94.90%	94.90%			94.90%	94.90%
Lille [Member] | Goodman Europe JV [Member]
Investments in and Advances to Affiliates [Line Items]
Number of Acquisitions									1
Number of Properties													1
Subsequent Event [Member] | Gramercy European Property Fund [Member]
Investments in and Advances to Affiliates [Line Items]
Ownership interest sold		100.00%

Unconsolidated Equity Investm54

Unconsolidated Equity Investments (Summary of Unconsolidated Equity Investments) (Details) $ in Thousands	Jun. 30, 2017USD ($)Property	Dec. 31, 2016USD ($)Property	Jun. 30, 2016	Oct. 31, 2015
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated equity investment	$ 114,880	$ 101,807
Number of Properties | Property	54	46
Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Ownership %	14.20%	14.20%
Voting Interest %	14.20%
Investment in unconsolidated equity investment	$ 55,724	$ 50,367
Number of Properties | Property	30	26
Goodman Europe JV [Member]
Schedule of Equity Method Investments [Line Items]
Ownership %	5.10%	5.10%	80.00%
Voting Interest %	5.10%
Investment in unconsolidated equity investment	$ 3,370	$ 3,491
Number of Properties | Property	8	8
Basis difference	$ 2,406	$ 2,286
Goodman Europe JV [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Ownership %	94.90%	94.90%
Strategic Office Partners [Member]
Schedule of Equity Method Investments [Line Items]
Ownership %	25.00%
Voting Interest %	25.00%
Investment in unconsolidated equity investment	$ 23,079	$ 15,872
Number of Properties | Property	10	6
Goodman UK JV [Member]
Schedule of Equity Method Investments [Line Items]
Ownership %	80.00%
Voting Interest %	50.00%
Investment in unconsolidated equity investment	$ 26,086	$ 25,309
Number of Properties | Property	2	2
Basis difference	$ 4,025	$ 3,941
CBRE Strategic Partners Asia [Member]
Schedule of Equity Method Investments [Line Items]
Ownership %	5.07%
Voting Interest %	5.07%
Investment in unconsolidated equity investment	$ 3,995	$ 4,145
Number of Properties | Property	2	2
Philips JV [Member]
Schedule of Equity Method Investments [Line Items]
Ownership %	25.00%
Voting Interest %	25.00%
Investment in unconsolidated equity investment	$ 0	$ 0
Number of Properties | Property	1	1
Morristown JV [Member]
Schedule of Equity Method Investments [Line Items]
Ownership %	50.00%	50.00%
Voting Interest %	50.00%			50.00%
Investment in unconsolidated equity investment	$ 2,626	$ 2,623
Number of Properties | Property	1	1
Gramercy Europe Asset Management - European Fund Carry Co [Member]
Schedule of Equity Method Investments [Line Items]
Ownership %	25.00%
Investment in unconsolidated equity investment	$ 5	$ 8

Unconsolidated Equity Investm55

Unconsolidated Equity Investments (Rollforward of Unconsolidated Equity Investments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
SEC Schedule III, Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Beginning balance			$ 101,807
Contributions to unconsolidated equity investments			7,400
Equity in net income (loss) from unconsolidated equity investments	$ 248	$ (168)	154	$ (2,923)
Other comprehensive income of unconsolidated equity investments			6,208
Distributions from unconsolidated equity investments			(689)
Ending Balance	$ 114,880		$ 114,880

Unconsolidated Equity Investm56

Unconsolidated Equity Investments (Combined Balance Sheets for the Company's Joint Ventures) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Corporate Joint Venture [Member]
Assets:
Real estate assets, net		$ 49,580
Other assets		3,020
Total assets		52,600
Liabilities and members' equity:
Mortgage notes payable		39,730
Other liabilities		3,259
Total liabilities		42,989
Gramercy Property Trust equity		2,631
Other members' equity		6,980
Liabilities and members' equity		$ 52,600
Gramercy European Property Fund [Member]
Liabilities and members' equity:
Ownership %	14.20%	14.20%
Goodman Europe JV [Member]
Liabilities and members' equity:
Ownership %	5.10%	5.10%	80.00%
Goodman Europe JV [Member] | Gramercy European Property Fund [Member]
Liabilities and members' equity:
Ownership %	94.90%	94.90%
Strategic Office Partners [Member]
Liabilities and members' equity:
Ownership %	25.00%
Strategic Office Partners [Member] | Corporate Joint Venture [Member]
Assets:
Real estate assets, net	$ 242,396	$ 149,484
Other assets	50,557	42,323
Total assets	292,953	191,807
Liabilities and members' equity:
Mortgage notes payable	187,791	121,894
Other liabilities	10,767	4,347
Total liabilities	198,558	126,241
Gramercy Property Trust equity	23,079	15,872
Other members' equity	71,316	49,694
Liabilities and members' equity	$ 292,953	191,807
Goodman UK JV [Member]
Liabilities and members' equity:
Ownership %	80.00%
Goodman UK JV [Member] | Corporate Joint Venture [Member]
Assets:
Real estate assets, net	$ 31,614	25,128
Other assets	1,921	6,650
Total assets	33,535	31,778
Liabilities and members' equity:
Mortgage notes payable	0	0
Other liabilities	735	934
Total liabilities	735	934
Gramercy Property Trust equity	26,086	25,309
Other members' equity	6,714	5,535
Liabilities and members' equity	$ 33,535	31,778
CBRE Strategic Partners Asia [Member]
Liabilities and members' equity:
Ownership %	5.07%
CBRE Strategic Partners Asia [Member] | Corporate Joint Venture [Member]
Assets:
Real estate assets, net	$ 85,653	87,852
Other assets	11,518	12,247
Total assets	97,171	100,099
Liabilities and members' equity:
Mortgage notes payable	0	0
Other liabilities	14,371	14,383
Total liabilities	14,371	14,383
Gramercy Property Trust equity	3,995	4,145
Other members' equity	78,805	81,571
Liabilities and members' equity	97,171	100,099
Other [Member] | Corporate Joint Venture [Member]
Assets:
Real estate assets, net	49,065
Other assets	3,121
Total assets	52,186
Liabilities and members' equity:
Mortgage notes payable	39,270
Other liabilities	3,377
Total liabilities	42,647
Gramercy Property Trust equity	2,631
Other members' equity	6,908
Liabilities and members' equity	52,186
Europe [Member] | Gramercy European Property Fund [Member] | Corporate Joint Venture [Member]
Assets:
Real estate assets, net	850,610	632,156
Other assets	99,384	149,796
Total assets	949,994	781,952
Liabilities and members' equity:
Mortgage notes payable	480,950	390,249
Other liabilities	62,474	27,718
Total liabilities	543,424	417,967
Gramercy Property Trust equity	59,089	53,850
Other members' equity	347,481	310,135
Liabilities and members' equity	949,994	781,952
Europe [Member] | Goodman Europe JV [Member] | Corporate Joint Venture [Member]
Assets:
Real estate assets, net	238,253	285,087
Other assets	29,136	86,273
Total assets	267,389	371,360
Liabilities and members' equity:
Mortgage notes payable	150,436	174,269
Other liabilities	6,963	7,778
Total liabilities	157,399	182,047
Gramercy Property Trust equity	12,290	12,734
Other members' equity	97,700	176,579
Liabilities and members' equity	267,389	371,360
Europe [Member] | Gramercy European Property Fund (excluding legacy Goodman Europe Joint Venture) [Member] | Corporate Joint Venture [Member]
Assets:
Real estate assets, net	612,357	347,069
Other assets	70,248	63,523
Total assets	682,605	410,592
Liabilities and members' equity:
Mortgage notes payable	330,514	215,980
Other liabilities	55,511	19,940
Total liabilities	386,025	235,920
Gramercy Property Trust equity	46,799	41,116
Other members' equity	249,781	133,556
Liabilities and members' equity	$ 682,605	$ 410,592

Unconsolidated Equity Investm57

Unconsolidated Equity Investments (Real Estate Assets Subject to Mortgages) (Details) $ in Thousands	Jun. 30, 2017USD ($)Property	Dec. 31, 2016USD ($)	Jun. 30, 2016
Schedule of Equity Method Investments [Line Items]
Percentage of face amount of debt presented	100.00%
Strategic Office Partners [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	25.00%
Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	14.20%	14.20%
Goodman Europe JV [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	5.10%	5.10%	80.00%
Phillips JV [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	25.00%
Wholly Owned Properties [Member] | Strategic Office Partners Portfolio [Member] | Strategic Office Partners [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	25.00%
Wholly Owned Properties [Member] | Durrholz [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	14.20%
Wholly Owned Properties [Member] | Venray [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	14.20%
Wholly Owned Properties [Member] | Lille [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	14.20%
Wholly Owned Properties [Member] | Carlisle [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	14.20%
Wholly Owned Properties [Member] | Saint Martin [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	14.20%
Wholly Owned Properties [Member] | Castelnau [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	14.20%
Wholly Owned Properties [Member] | Oud-Beijerland [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	14.20%
Wholly Owned Properties [Member] | Zaandam [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	14.20%
Wholly Owned Properties [Member] | Kerkrade [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	14.20%
Wholly Owned Properties [Member] | Friedrichspark [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	14.20%
Wholly Owned Properties [Member] | Fredersdorf [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	14.20%
Wholly Owned Properties [Member] | Breda [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	14.20%
Wholly Owned Properties [Member] | Juechen [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	14.20%
Wholly Owned Properties [Member] | Piaseczno [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	14.20%
Wholly Owned Properties [Member] | Strykow [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	14.20%
Wholly Owned Properties [Member] | Uden [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	14.20%
Wholly Owned Properties [Member] | Rotterdam [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	14.20%
Wholly Owned Properties [Member] | Frechen [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	14.20%
Wholly Owned Properties [Member] | Meerane [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	14.20%
Wholly Owned Properties [Member] | Amsterdam [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	14.20%
Wholly Owned Properties [Member] | Tiel [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	14.20%
Wholly Owned Properties [Member] | Netherlands Portfolio [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	14.20%
Wholly Owned Properties [Member] | Kutno [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	14.20%
Wholly Owned Properties [Member] | European Facility 1 [Member] | Goodman Europe JV [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	18.60%
Wholly Owned Properties [Member] | European Facility 2 [Member] | Goodman Europe JV [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	18.60%
Wholly Owned Properties [Member] | Utrecht [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	14.20%
Wholly Owned Properties [Member] | Worksop [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	14.20%	3.94%
Wholly Owned Properties [Member] | Somerset [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Economic Ownership	25.00%	6.90%
Mortgages [Member]
Schedule of Equity Method Investments [Line Items]
Total mortgage notes payable, net	$ 493,293
Mortgages [Member] | Wholly Owned Properties [Member]
Schedule of Equity Method Investments [Line Items]
Outstanding Balance	709,236	$ 546,265
Net deferred financing costs and net debt premium	(1,225)	5,608
Total mortgage notes payable, net	$ 708,011	551,873
Mortgages [Member] | Wholly Owned Properties [Member] | Strategic Office Partners Portfolio [Member] | Strategic Office Partners [Member]
Schedule of Equity Method Investments [Line Items]
Interest Rate	4.08%
Outstanding Balance	$ 191,600	125,000
Number of real estate properties pledged under debt | Property	10
Mortgages [Member] | Wholly Owned Properties [Member] | Durrholz [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Interest Rate	1.52%
Outstanding Balance	$ 13,197	12,289
Mortgages [Member] | Wholly Owned Properties [Member] | Venray [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Interest Rate	3.32%
Outstanding Balance	$ 14,068	13,015
Mortgages [Member] | Wholly Owned Properties [Member] | Lille [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Interest Rate	3.13%
Outstanding Balance	$ 29,422	27,081
Mortgages [Member] | Wholly Owned Properties [Member] | Carlisle [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Interest Rate	3.32%
Outstanding Balance	$ 11,022	10,443
Mortgages [Member] | Wholly Owned Properties [Member] | Saint Martin [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Interest Rate	2.67%
Outstanding Balance	$ 15,608	0
Mortgages [Member] | Wholly Owned Properties [Member] | Castelnau [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Interest Rate	2.67%
Outstanding Balance	$ 11,243	0
Mortgages [Member] | Wholly Owned Properties [Member] | Oud-Beijerland [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Interest Rate	2.09%
Outstanding Balance	$ 8,704	8,077
Mortgages [Member] | Wholly Owned Properties [Member] | Zaandam [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Interest Rate	2.08%
Outstanding Balance	$ 12,551	11,647
Mortgages [Member] | Wholly Owned Properties [Member] | Kerkrade [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Interest Rate	2.08%
Outstanding Balance	$ 10,369	9,622
Mortgages [Member] | Wholly Owned Properties [Member] | Friedrichspark [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Interest Rate	2.08%
Outstanding Balance	$ 9,370	8,694
Mortgages [Member] | Wholly Owned Properties [Member] | Fredersdorf [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Interest Rate	2.08%
Outstanding Balance	$ 12,120	11,247
Mortgages [Member] | Wholly Owned Properties [Member] | Breda [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Interest Rate	1.90%
Outstanding Balance	$ 10,721	9,948
Mortgages [Member] | Wholly Owned Properties [Member] | Juechen [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Interest Rate	1.89%
Outstanding Balance	$ 20,316	18,852
Mortgages [Member] | Wholly Owned Properties [Member] | Piaseczno [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Interest Rate	1.98%
Outstanding Balance	$ 8,773	8,141
Mortgages [Member] | Wholly Owned Properties [Member] | Strykow [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Interest Rate	1.98%
Outstanding Balance	$ 20,657	19,167
Mortgages [Member] | Wholly Owned Properties [Member] | Uden [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Interest Rate	1.98%
Outstanding Balance	$ 9,606	8,913
Mortgages [Member] | Wholly Owned Properties [Member] | Rotterdam [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Interest Rate	1.89%
Outstanding Balance	$ 8,227	7,633
Mortgages [Member] | Wholly Owned Properties [Member] | Frechen [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Interest Rate	1.49%
Outstanding Balance	$ 6,518	6,043
Mortgages [Member] | Wholly Owned Properties [Member] | Meerane [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Interest Rate	1.35%
Outstanding Balance	$ 10,945	10,138
Mortgages [Member] | Wholly Owned Properties [Member] | Amsterdam [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Interest Rate	1.59%
Outstanding Balance	$ 3,339	3,093
Mortgages [Member] | Wholly Owned Properties [Member] | Tiel [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Interest Rate	1.59%
Outstanding Balance	$ 9,904	9,174
Mortgages [Member] | Wholly Owned Properties [Member] | Netherlands Portfolio [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Interest Rate	3.02%
Outstanding Balance	$ 14,568	13,409
Number of real estate properties pledged under debt | Property	5
Mortgages [Member] | Wholly Owned Properties [Member] | Kutno [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Interest Rate	1.91%
Outstanding Balance	$ 6,399	5,890
Mortgages [Member] | Wholly Owned Properties [Member] | European Facility [Member] | Goodman Europe JV [Member]
Schedule of Equity Method Investments [Line Items]
Number of real estate properties pledged under debt | Property	8
Mortgages [Member] | Wholly Owned Properties [Member] | European Facility 1 [Member] | Goodman Europe JV [Member]
Schedule of Equity Method Investments [Line Items]
Interest Rate	0.90%
Outstanding Balance	$ 34,277	31,551
Mortgages [Member] | Wholly Owned Properties [Member] | European Facility 2 [Member] | Goodman Europe JV [Member]
Schedule of Equity Method Investments [Line Items]
Interest Rate	1.75%
Outstanding Balance	$ 116,159	106,917
Mortgages [Member] | Wholly Owned Properties [Member] | Utrecht [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Interest Rate	1.95%
Outstanding Balance	$ 39,277	0
Mortgages [Member] | Wholly Owned Properties [Member] | Worksop [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Outstanding Balance	11,006	10,551
Mortgages [Member] | Wholly Owned Properties [Member] | Somerset [Member] | Gramercy European Property Fund [Member]
Schedule of Equity Method Investments [Line Items]
Outstanding Balance	$ 39,270	$ 39,730

Unconsolidated Equity Investm58

Unconsolidated Equity Investments (Combined Income Statement for the Company's Joint Ventures) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Investments in and Advances to Affiliates [Line Items]
Company's equity in net income (loss) within continuing operations	$ 248	$ (168)	$ 154	$ (2,923)
Gramercy European Property Fund [Member]
Investments in and Advances to Affiliates [Line Items]
Ownership %	14.20%		14.20%		14.20%
Goodman Europe JV [Member]
Investments in and Advances to Affiliates [Line Items]
Ownership %	5.10%	80.00%	5.10%	80.00%	5.10%
Strategic Office Partners [Member]
Investments in and Advances to Affiliates [Line Items]
Ownership %	25.00%		25.00%
Goodman UK JV [Member]
Investments in and Advances to Affiliates [Line Items]
Ownership %	80.00%		80.00%
CBRE Strategic Partners Asia [Member]
Investments in and Advances to Affiliates [Line Items]
Ownership %	5.07%		5.07%
Corporate Joint Venture [Member] | Strategic Office Partners [Member]
Investments in and Advances to Affiliates [Line Items]
Revenues	$ 7,174		$ 12,700
Operating expenses	2,316		3,790
Interest expense	2,055		3,565
Depreciation and amortization	2,852		5,355
Total expenses	7,223		12,710
Net income (loss) from operations	(49)		(10)
Gain (loss) on derivatives	(413)		(762)
Provision for taxes	0		0
Net income (loss)	(462)		(772)
Company's share in net income (loss)	(36)		(51)
Adjustments for REIT basis	0		0
Corporate Joint Venture [Member] | Strategic Office Partners [Member] | Continuing Operations [Member]
Investments in and Advances to Affiliates [Line Items]
Company's equity in net income (loss) within continuing operations	(36)		(51)
Corporate Joint Venture [Member] | Goodman UK JV [Member]
Investments in and Advances to Affiliates [Line Items]
Revenues	293	$ 636	588	$ 4,920
Operating expenses	225	186	527	473
Acquisition expenses		0		0
Interest expense	0	0	0	0
Depreciation and amortization	261	371	636	1,121
Total expenses	486	557	1,163	1,594
Net income (loss) from operations	(193)	79	(575)	3,326
Gain (loss) on derivatives	0	0	0	0
Loss on extinguishment of debt				0
Net gain on disposals				0
Provision for taxes	(20)	0	(28)	0
Net income (loss)	(213)	79	(603)	3,326
Company's share in net income (loss)	(171)	63	(483)	2,661
Adjustments for REIT basis	(40)	(7)	(129)	(278)
Corporate Joint Venture [Member] | Goodman UK JV [Member] | Continuing Operations [Member]
Investments in and Advances to Affiliates [Line Items]
Company's equity in net income (loss) within continuing operations	(211)	56	(612)	2,383
Corporate Joint Venture [Member] | Duke Joint Venture [Member]
Investments in and Advances to Affiliates [Line Items]
Revenues		8,860		19,395
Operating expenses		2,128		5,118
Acquisition expenses		0		0
Interest expense		167		602
Depreciation and amortization		3,424		7,152
Total expenses		5,719		12,872
Net income (loss) from operations		3,141		6,523
Gain (loss) on derivatives		0		0
Loss on extinguishment of debt				(7,962)
Net gain on disposals				38,535
Provision for taxes		0		0
Net income (loss)		3,141		37,096
Company's share in net income (loss)		2,513		29,675
Adjustments for REIT basis		(872)		(33,493)
Corporate Joint Venture [Member] | Duke Joint Venture [Member] | Continuing Operations [Member]
Investments in and Advances to Affiliates [Line Items]
Company's equity in net income (loss) within continuing operations		1,641		(3,818)
Corporate Joint Venture [Member] | CBRE Strategic Partners Asia [Member]
Investments in and Advances to Affiliates [Line Items]
Revenues	230	1,024	(2,215)	242
Operating expenses	283	288	701	867
Acquisition expenses		0		0
Interest expense	0	0	0	0
Depreciation and amortization	0	0	0	0
Total expenses	283	288	701	867
Net income (loss) from operations	(53)	736	(2,916)	(625)
Gain (loss) on derivatives	0	0	0	0
Loss on extinguishment of debt				0
Net gain on disposals				0
Provision for taxes	0	0	0	0
Net income (loss)	(53)	736	(2,916)	(625)
Company's share in net income (loss)	(4)	36	(150)	(36)
Adjustments for REIT basis	0	0	0	0
Corporate Joint Venture [Member] | CBRE Strategic Partners Asia [Member] | Continuing Operations [Member]
Investments in and Advances to Affiliates [Line Items]
Company's equity in net income (loss) within continuing operations	(4)	36	(150)	(36)
Corporate Joint Venture [Member] | Other [Member]
Investments in and Advances to Affiliates [Line Items]
Revenues	1,094	1,083	2,208	2,164
Operating expenses	116	85	274	213
Acquisition expenses		23		27
Interest expense	700	704	1,341	1,432
Depreciation and amortization	333	333	666	666
Total expenses	1,149	1,145	2,281	2,338
Net income (loss) from operations	(55)	(62)	(73)	(174)
Gain (loss) on derivatives	0	0	0	0
Loss on extinguishment of debt				0
Net gain on disposals				0
Provision for taxes	0	0	0	0
Net income (loss)	(55)	(62)	(73)	(174)
Company's share in net income (loss)	9	11	0	4
Adjustments for REIT basis	0	0	0	0
Corporate Joint Venture [Member] | Other [Member] | Continuing Operations [Member]
Investments in and Advances to Affiliates [Line Items]
Company's equity in net income (loss) within continuing operations	9	11	0	4
Europe [Member] | Corporate Joint Venture [Member] | Gramercy European Property Fund [Member]
Investments in and Advances to Affiliates [Line Items]
Revenues	16,802	11,957	31,875	23,135
Operating expenses	3,747	1,901	7,620	3,265
Acquisition expenses		6,831		7,497
Interest expense	2,412	1,911	4,558	3,760
Depreciation and amortization	7,346	4,829	13,840	9,464
Total expenses	13,505	15,472	26,018	23,986
Net income (loss) from operations	3,297	(3,515)	5,857	(851)
Gain (loss) on derivatives	1,049	(1,489)	2,270	(5,303)
Loss on extinguishment of debt				0
Net gain on disposals				0
Provision for taxes	(439)	(276)	(310)	(591)
Net income (loss)	3,907	(5,280)	7,817	(6,745)
Company's share in net income (loss)	527	(2,843)	1,040	(1,901)
Adjustments for REIT basis	(37)	931	(73)	445
Europe [Member] | Corporate Joint Venture [Member] | Gramercy European Property Fund [Member] | Continuing Operations [Member]
Investments in and Advances to Affiliates [Line Items]
Company's equity in net income (loss) within continuing operations	490	(1,912)	967	(1,456)
Europe [Member] | Corporate Joint Venture [Member] | Goodman Europe JV [Member]
Investments in and Advances to Affiliates [Line Items]
Revenues	5,323	6,073	10,278	12,194
Operating expenses	945	833	1,867	1,696
Acquisition expenses		4,960		4,960
Interest expense	614	944	1,286	1,866
Depreciation and amortization	2,024	2,342	4,045	4,631
Total expenses	3,583	9,079	7,198	13,153
Net income (loss) from operations	1,740	(3,006)	3,080	(959)
Gain (loss) on derivatives	0	0	0	0
Loss on extinguishment of debt				0
Net gain on disposals				0
Provision for taxes	(15)	0	(32)	0
Net income (loss)	1,725	(3,006)	3,048	(959)
Company's share in net income (loss)	88	(2,405)	155	(768)
Adjustments for REIT basis	(37)	931	(73)	445
Europe [Member] | Corporate Joint Venture [Member] | Goodman Europe JV [Member] | Continuing Operations [Member]
Investments in and Advances to Affiliates [Line Items]
Company's equity in net income (loss) within continuing operations	51	(1,474)	82	(323)
Europe [Member] | Corporate Joint Venture [Member] | Gramercy European Property Fund (excluding legacy Goodman Europe Joint Venture) [Member]
Investments in and Advances to Affiliates [Line Items]
Revenues	11,479	5,884	21,597	10,941
Operating expenses	2,802	1,068	5,753	1,569
Acquisition expenses		1,871		2,537
Interest expense	1,798	967	3,272	1,894
Depreciation and amortization	5,322	2,487	9,795	4,833
Total expenses	9,922	6,393	18,820	10,833
Net income (loss) from operations	1,557	(509)	2,777	108
Gain (loss) on derivatives	1,049	(1,489)	2,270	(5,303)
Loss on extinguishment of debt				0
Net gain on disposals				0
Provision for taxes	(424)	(276)	(278)	(591)
Net income (loss)	2,182	(2,274)	4,769	(5,786)
Company's share in net income (loss)	439	(438)	885	(1,133)
Adjustments for REIT basis	0	0	0	0
Europe [Member] | Corporate Joint Venture [Member] | Gramercy European Property Fund (excluding legacy Goodman Europe Joint Venture) [Member] | Continuing Operations [Member]
Investments in and Advances to Affiliates [Line Items]
Company's equity in net income (loss) within continuing operations	$ 439	$ (438)	$ 885	$ (1,133)

Debt Obligations (Secured Debt)

Debt Obligations (Secured Debt) (Narrative) (Details) $ in Thousands	3 Months Ended			6 Months Ended					12 Months Ended
	Jun. 30, 2017USD ($)	Mar. 31, 2017Property	Jun. 30, 2016USD ($)mortgage	Jun. 30, 2017USD ($)	Jun. 30, 2017USD ($)Property	Jun. 30, 2017USD ($)land_parcel	Jun. 30, 2017USD ($)mortgage	Jun. 30, 2016USD ($)mortgage	Dec. 31, 2016USD ($)Property
Debt Instrument [Line Items]
Number of Acquisitions		21			19	2
Number of real estate properties in which secured debt repaid | Property					2
Loss on extinguishment of debt	$ 268		$ (1,356)	$ 60				$ (7,113)
Gain on extinguishment of debt, discontinued operations	0		$ 0	0				$ 1,930
Mortgages [Member]
Debt Instrument [Line Items]
Number of real estate properties in which secured debt repaid			2		2			8
Refinance amount				10,456
Mortgages transferred | mortgage							2	1
Loss on extinguishment of debt			$ (1,356)					$ (7,113)
Gain on extinguishment of debt, discontinued operations			$ 0					$ 1,930
Series of Individually Immaterial Business Acquisitions [Member] | Mortgages [Member]
Debt Instrument [Line Items]
Non-recourse debt	$ 3,680			$ 3,680	$ 3,680	$ 3,680	$ 3,680		$ 244,188
Number of Acquisitions | Property					1				27

Debt Obligations (Schedule of M

Debt Obligations (Schedule of Mortgage Notes Payable) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)PropertySecurityLoan	Dec. 31, 2016USD ($)
Debt Instrument [Line Items]
Number of real estate properties in which secured debt repaid | Property	2
Number of loans cross collateralized by properties | SecurityLoan	5
Mortgage Notes Payable [Member]
Debt Instrument [Line Items]
Outstanding Balance	$ 493,293	$ 555,484
Net deferred financing costs and net debt premium	2,111	3,158
Total mortgage notes payable, net	$ 495,404	558,642
Mortgage Notes Payable [Member] | Logistics Portfolio - Pool 2 [Member]
Debt Instrument [Line Items]
Interest Rate	4.48%
Outstanding Balance	$ 35,926	36,279
Number of real estate properties pledged under debt | Property	5
Mortgage Notes Payable [Member] | Dallas [Member]
Debt Instrument [Line Items]
Interest Rate	3.05%
Outstanding Balance	$ 9,429	9,540
Mortgage Notes Payable [Member] | Cincinnati [Member]
Debt Instrument [Line Items]
Interest Rate	3.29%
Outstanding Balance	$ 6,552	6,628
Mortgage Notes Payable [Member] | Jacksonville [Member]
Debt Instrument [Line Items]
Interest Rate	3.05%
Outstanding Balance	$ 6,773	6,852
Mortgage Notes Payable [Member] | Phoenix [Member]
Debt Instrument [Line Items]
Interest Rate	3.05%
Outstanding Balance	$ 4,073	4,120
Mortgage Notes Payable [Member] | Minneapolis [Member]
Debt Instrument [Line Items]
Interest Rate	3.05%
Outstanding Balance	$ 5,932	6,001
Mortgage Notes Payable [Member] | Ames [Member]
Debt Instrument [Line Items]
Interest Rate	5.05%
Outstanding Balance	$ 16,191	16,436
Mortgage Notes Payable [Member] | Columbus [Member]
Debt Instrument [Line Items]
Interest Rate	4.01%
Outstanding Balance	$ 19,240	19,708
Mortgage Notes Payable [Member] | Greenwood [Member]
Debt Instrument [Line Items]
Interest Rate	3.59%
Outstanding Balance	$ 7,347	7,436
Mortgage Notes Payable [Member] | Greenfield [Member]
Debt Instrument [Line Items]
Interest Rate	3.63%
Outstanding Balance	$ 5,938	6,010
Mortgage Notes Payable [Member] | Logistics Portfolio - Pool 3 [Member]
Debt Instrument [Line Items]
Interest Rate	3.96%
Outstanding Balance	$ 43,300	43,300
Number of real estate properties pledged under debt | Property	2
Mortgage Notes Payable [Member] | Philadelphia [Member]
Debt Instrument [Line Items]
Interest Rate	4.99%
Outstanding Balance	$ 12,137	12,328
Mortgage Notes Payable [Member] | Columbus [Member]
Debt Instrument [Line Items]
Interest Rate	3.94%
Outstanding Balance	$ 5,815	5,908
Mortgage Notes Payable [Member] | Bridgeview [Member]
Debt Instrument [Line Items]
Interest Rate	3.90%
Outstanding Balance	$ 5,928	6,014
Mortgage Notes Payable [Member] | Spartanburg [Member]
Debt Instrument [Line Items]
Interest Rate	3.20%
Outstanding Balance	$ 831	1,025
Mortgage Notes Payable [Member] | Charleston [Member]
Debt Instrument [Line Items]
Interest Rate	3.11%
Outstanding Balance	$ 725	986
Mortgage Notes Payable [Member] | Lawrence [Member]
Debt Instrument [Line Items]
Interest Rate	5.02%
Outstanding Balance	$ 20,385	20,703
Mortgage Notes Payable [Member] | Charlotte [Member]
Debt Instrument [Line Items]
Interest Rate	3.28%
Outstanding Balance	$ 1,882	2,217
Mortgage Notes Payable [Member] | Hawthorne [Member]
Debt Instrument [Line Items]
Interest Rate	3.52%
Outstanding Balance	$ 17,402	17,638
Mortgage Notes Payable [Member] | Charleston [Member]
Debt Instrument [Line Items]
Interest Rate	2.97%
Outstanding Balance	$ 866	984
Mortgage Notes Payable [Member] | Charleston [Member]
Debt Instrument [Line Items]
Interest Rate	3.37%
Outstanding Balance	$ 866	984
Mortgage Notes Payable [Member] | Charleston [Member]
Debt Instrument [Line Items]
Interest Rate	3.32%
Outstanding Balance	$ 881	1,001
Mortgage Notes Payable [Member] | Charlotte [Member]
Debt Instrument [Line Items]
Interest Rate	3.38%
Outstanding Balance	$ 751	853
Mortgage Notes Payable [Member] | Des Plaines [Member]
Debt Instrument [Line Items]
Interest Rate	5.54%
Outstanding Balance	$ 2,425	2,463
Mortgage Notes Payable [Member] | Waco [Member]
Debt Instrument [Line Items]
Interest Rate	4.75%
Outstanding Balance	$ 15,038	15,187
Mortgage Notes Payable [Member] | Deerfield [Member]
Debt Instrument [Line Items]
Interest Rate	3.71%
Outstanding Balance	$ 10,628	10,804
Mortgage Notes Payable [Member] | Winston-Salem [Member]
Debt Instrument [Line Items]
Interest Rate	3.41%
Outstanding Balance	$ 3,782	4,199
Mortgage Notes Payable [Member] | Winston-Salem [Member]
Debt Instrument [Line Items]
Interest Rate	3.42%
Outstanding Balance	$ 1,253	1,388
Mortgage Notes Payable [Member] | Logistics Portfolio - Pool 1 [Member]
Debt Instrument [Line Items]
Interest Rate	4.27%
Outstanding Balance	$ 38,600	39,002
Number of real estate properties pledged under debt | Property	3
Mortgage Notes Payable [Member] | CCC Portfolio [Member]
Debt Instrument [Line Items]
Interest Rate	4.24%
Outstanding Balance	$ 23,048	23,280
Number of real estate properties pledged under debt | Property	5
Mortgage Notes Payable [Member] | Logistics Portfolio - Pool 4 [Member]
Debt Instrument [Line Items]
Interest Rate	4.36%
Outstanding Balance	$ 79,500	79,500
Number of real estate properties pledged under debt | Property	6
Mortgage Notes Payable [Member] | KIK USA Portfolio [Member]
Debt Instrument [Line Items]
Interest Rate	4.31%
Outstanding Balance	$ 7,303	7,450
Number of real estate properties pledged under debt | Property	3
Mortgage Notes Payable [Member] | Yuma [Member]
Debt Instrument [Line Items]
Interest Rate	5.27%
Outstanding Balance	$ 11,959	12,058
Mortgage Notes Payable [Member] | Allentown [Member]
Debt Instrument [Line Items]
Interest Rate	5.16%
Outstanding Balance	$ 22,885	23,078
Mortgage Notes Payable [Member] | Spartanburg [Member]
Debt Instrument [Line Items]
Interest Rate	3.72%
Outstanding Balance	$ 6,003	6,360
Mortgage Notes Payable [Member] | Durham [Member]
Debt Instrument [Line Items]
Interest Rate	4.02%
Outstanding Balance	$ 3,664	0
Mortgage Notes Payable [Member] | Charleston [Member]
Debt Instrument [Line Items]
Interest Rate	3.80%
Outstanding Balance	$ 6,334	6,658
Mortgage Notes Payable [Member] | Hackettstown [Member]
Debt Instrument [Line Items]
Interest Rate	5.49%
Outstanding Balance	$ 9,519	9,550
Mortgage Notes Payable [Member] | Hutchins [Member]
Debt Instrument [Line Items]
Interest Rate	5.41%
Outstanding Balance	$ 22,182	22,764
Mortgage Notes Payable [Member] | Buford [Member]
Debt Instrument [Line Items]
Interest Rate	4.67%
Outstanding Balance	$ 0	15,512
Mortgage Notes Payable [Member] | Woodcliff Lake [Member]
Debt Instrument [Line Items]
Interest Rate	3.04%
Outstanding Balance	$ 0	35,366
Mortgage Notes Payable [Member] | KIK Canada Portfolio [Member]
Debt Instrument [Line Items]
Interest Rate	3.57%
Outstanding Balance	$ 0	$ 7,914
Number of real estate properties in which secured debt repaid | Property	2

Debt Obligations (Unsecured Deb

Debt Obligations (Unsecured Debt) (Narrative) (Details)	6 Months Ended
	Jun. 30, 2017extension	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Unsecured Debt [Member] | 2015 Revolving Credit Facility - Multicurrency Tranche [Member]
Debt Instrument [Line Items]
Interest Rate	1.02%
Unsecured Debt [Member] | 3-Year Term Loan [Member]
Debt Instrument [Line Items]
Interest Rate	2.35%
Unsecured Debt [Member] | 7-Year Term Loan [Member]
Debt Instrument [Line Items]
Interest Rate	2.59%
Unsecured Debt [Member] | Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Face amount		$ 500,000,000
JPMorgan Chase Bank [Member] | 2015 Revolving Credit Facility - U.S. Dollar Tranche [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 1,900,000,000
Line of credit facility, number of extensions | extension	2
JPMorgan Chase Bank [Member] | Term Loans [Member] | 3-Year Term Loan [Member]
Debt Instrument [Line Items]
Face amount			300,000,000
JPMorgan Chase Bank [Member] | Term Loans [Member] | JPM Term Loan [Member]
Debt Instrument [Line Items]
Line of credit facility, number of extensions | extension	1
JPMorgan Chase Bank [Member] | Term Loans [Member] | JPM Term Loan [Member] | Federal Funds Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.50%
JPMorgan Chase Bank [Member] | Term Loans [Member] | JPM Term Loan [Member] | LIBOR 30-Day [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.00%
JPMorgan Chase Bank [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | Unsecured Credit Facility [Member]
Debt Instrument [Line Items]
Face amount			850,000,000
JPMorgan Chase Bank [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | 2015 Revolving Credit Facility - US Dollars Tranche [Member]
Debt Instrument [Line Items]
Face amount			750,000,000
JPMorgan Chase Bank [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | 2015 Revolving Credit Facility - Multicurrency Tranche [Member]
Debt Instrument [Line Items]
Face amount			100,000,000
JPMorgan Chase Bank [Member] | Revolving Credit Facility [Member] | Term Loans [Member] | Unsecured Credit Facility [Member]
Debt Instrument [Line Items]
Face amount			1,050,000,000
Capital One [Member] | Term Loans [Member] | 7-Year Term Loan [Member]
Debt Instrument [Line Items]
Face amount			$ 175,000,000
Capital One [Member] | Term Loans [Member] | 7-Year Term Loan [Member] | Federal Funds Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.50%
Capital One [Member] | Term Loans [Member] | 7-Year Term Loan [Member] | LIBOR 30-Day [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.00%
Minimum [Member] | Unsecured Debt [Member] | Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Interest Rate		3.89%
Minimum [Member] | JPMorgan Chase Bank [Member] | Term Loans [Member] | JPM Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.90%
Minimum [Member] | JPMorgan Chase Bank [Member] | Term Loans [Member] | JPM Term Loan [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.00%
Minimum [Member] | JPMorgan Chase Bank [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Commitment fee percentage	0.125%
Minimum [Member] | JPMorgan Chase Bank [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.875%
Minimum [Member] | JPMorgan Chase Bank [Member] | Revolving Credit Facility [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.00%
Minimum [Member] | Capital One [Member] | Term Loans [Member] | 7-Year Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.30%
Minimum [Member] | Capital One [Member] | Term Loans [Member] | 7-Year Term Loan [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.30%
Maximum [Member] | Unsecured Debt [Member] | Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Interest Rate		4.97%
Maximum [Member] | JPMorgan Chase Bank [Member] | Term Loans [Member] | JPM Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.75%
Maximum [Member] | JPMorgan Chase Bank [Member] | Term Loans [Member] | JPM Term Loan [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.75%
Maximum [Member] | JPMorgan Chase Bank [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Commitment fee percentage	0.30%
Maximum [Member] | JPMorgan Chase Bank [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.55%
Maximum [Member] | JPMorgan Chase Bank [Member] | Revolving Credit Facility [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.55%
Maximum [Member] | Capital One [Member] | Term Loans [Member] | 7-Year Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.10%
Maximum [Member] | Capital One [Member] | Term Loans [Member] | 7-Year Term Loan [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.10%

Debt Obligations (Exchangeable

Debt Obligations (Exchangeable Senior Notes) (Narrative) (Details)	6 Months Ended
	Jun. 30, 2017USD ($)$ / sharesshares	Dec. 31, 2016USD ($)	Mar. 18, 2014USD ($)
Debt Instrument [Line Items]
Reclassification of fair value of embedded exchange option on 3.75% exchangeable senior notes	$ 11,726,000
Convertible Debt [Member] | Exchangeable Senior Notes 3.75% [Member]
Debt Instrument [Line Items]
Face amount			$ 115,000,000
Interest Rate	3.75%
Redemption price, percentage of principal amount redeemed	100.00%
Conversion ratio	14.3349
Conversion of principal (in usd per share) | $ / shares	$ 1
Debt, fair value	$ 106,689,000
Carrying value of discount	110,154,000	$ 108,832,000
Unamortized discount	$ 4,846,000	$ 6,168,000
Chambers Street Properties [Member]
Debt Instrument [Line Items]
Merger conversion ratio | shares	3.1898
Chambers Street Properties [Member] | Convertible Debt [Member] | Exchangeable Senior Notes 3.75% [Member]
Debt Instrument [Line Items]
Number of shares issued in acquisition (in shares) | shares	45.7255
Common Shares [Member] | Convertible Debt [Member] | Exchangeable Senior Notes 3.75% [Member]
Debt Instrument [Line Items]
Conversion price (in usd per share) | $ / shares	$ 21.87
Pro Forma [Member] | Convertible Debt [Member] | Exchangeable Senior Notes 3.75% [Member]
Debt Instrument [Line Items]
Conversions (in shares) | shares	5,258,428
Value of conversion	$ 156,228,000
Share Price | $ / shares	$ 29.71

Debt Obligations (Schedule of C

Debt Obligations (Schedule of Credit Facilities and Term Loans) (Details) - Unsecured Debt [Member] - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Line of Credit Facility [Line Items]
Outstanding Balance	$ 1,910,955	$ 1,905,837
Unamortized discount and deferred financing costs	(8,262)	(9,704)
Long-term Debt	$ 1,902,693	1,896,133
2015 Revolving Credit Facility - Multicurrency Tranche [Member]
Line of Credit Facility [Line Items]
Stated Interest Rate	1.02%
Effective Interest Rate	1.02%
Outstanding Balance	$ 70,955	65,837
3-Year Term Loan [Member]
Line of Credit Facility [Line Items]
Stated Interest Rate	2.35%
Effective Interest Rate	2.33%
Outstanding Balance	$ 300,000	300,000
5-Year Term Loan [Member]
Line of Credit Facility [Line Items]
Stated Interest Rate	2.35%
Effective Interest Rate	2.70%
Outstanding Balance	$ 750,000	750,000
7-Year Term Loan [Member]
Line of Credit Facility [Line Items]
Stated Interest Rate	2.59%
Effective Interest Rate	3.34%
Outstanding Balance	$ 175,000	175,000
2015 Senior Notes Due 2024 [Member]
Line of Credit Facility [Line Items]
Stated Interest Rate	4.97%
Effective Interest Rate	5.07%
Outstanding Balance	$ 150,000	150,000
2016 Senior Notes Due 2022 [Member]
Line of Credit Facility [Line Items]
Stated Interest Rate	3.89%
Effective Interest Rate	4.00%
Outstanding Balance	$ 150,000	150,000
2016 Senior Notes Due 2025 [Member]
Line of Credit Facility [Line Items]
Stated Interest Rate	4.26%
Effective Interest Rate	4.38%
Outstanding Balance	$ 100,000	100,000
2016 Senior Notes Due 2026 [Member]
Line of Credit Facility [Line Items]
Stated Interest Rate	4.32%
Effective Interest Rate	4.43%
Outstanding Balance	$ 100,000	100,000
Exchangeable Senior Notes [Member]
Line of Credit Facility [Line Items]
Stated Interest Rate	3.75%
Effective Interest Rate	6.36%
Outstanding Balance	$ 115,000	$ 115,000

Debt Obligations (Schedule of64

Debt Obligations (Schedule of Maturities of Long-term Debt) (Details) $ in Thousands	Jun. 30, 2017USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]
Above market interest	$ (6,151)
Long-term Debt, Interest Payments, Fiscal Year Maturity [Abstract]
July 1 to December 31, 2017, interest	40,357
2018, interest	79,689
2019, interest	68,482
2020, interest	63,968
2021, interest	39,247
Thereafter, interest	88,910
Interest payments, total	374,502
Long-term Debt and Interest, Fiscal Year Maturity [Abstract]
July 1 to December 31, 2017, total	47,732
2018, total	250,508
2019, total	517,154
2020, total	195,026
2021, total	805,611
Thereafter, total	968,870
Net premium, total	2,778,750
2015 Revolving Credit Facility [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
July 1 to December 31, 2017	0
2,018	0
2,019	0
2,020	70,955
2,021	0
Thereafter	0
Above market interest	0
Long-term Debt	70,955
Senior Unsecured Notes [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
July 1 to December 31, 2017	0
2,018	0
2,019	0
2,020	0
2,021	0
Thereafter	500,000
Above market interest	0
Long-term Debt	500,000
Exchangeable Senior Notes 3.75% [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
July 1 to December 31, 2017	0
2,018	0
2,019	115,000
2,020	0
2,021	0
Thereafter	0
Above market interest	0
Long-term Debt	115,000
Term Loans [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
July 1 to December 31, 2017	0
2,018	0
2,019	300,000
2,020	0
2,021	750,000
Thereafter	175,000
Above market interest	0
Long-term Debt	1,225,000
Mortgage Notes Payable [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
July 1 to December 31, 2017	7,375
2,018	170,819
2,019	33,672
2,020	60,103
2,021	16,364
Thereafter	204,960
Above market interest	0
Long-term Debt	$ 493,293

Leasing Agreements (Schedule of

Leasing Agreements (Schedule of Future Minimum Rental Payments) (Details) $ in Thousands	Jun. 30, 2017USD ($)
Leases, Operating [Abstract]
July 1 to December 31, 2017	$ 194,693
2,018	389,118
2,019	361,797
2,020	332,521
2,021	306,634
Thereafter	1,581,109
Total minimum lease rental income	$ 3,165,872

Transactions with Trustee Rel66

Transactions with Trustee Related Entities and Related Parties (Narrative) (Details) € in Thousands, $ in Thousands	Jun. 30, 2016USD ($)	Jun. 30, 2016EUR (€)	Jul. 31, 2017USD ($)	Jul. 31, 2017EUR (€)	Dec. 31, 2016USD ($)Property	Dec. 31, 2016EUR (€)	Jun. 30, 2017USD ($)Propertydirector	Jun. 30, 2016USD ($)	Jun. 30, 2017USD ($)Propertydirector	Jun. 30, 2016USD ($)	Jun. 30, 2017EUR (€)Propertydirector	May 31, 2016ft²Property	Dec. 31, 2014
Related Party Transaction [Line Items]
Number of Properties | Property					46		54		54		54
Proceeds from sale of investment | $									$ 0	$ 47,408
Gain on sale of investment | $							$ 0	$ 7,229	0	7,229
Investments in joint ventures | $					$ 101,807		114,880		114,880
Duke Realty [Member]
Related Party Transaction [Line Items]
Amount of related party transaction | $								$ 156		$ 333
Lille [Member] | Gramercy European Property Fund [Member]
Related Party Transaction [Line Items]
Proceeds from sale of real estate					$ 2,662	€ 2,563
Minnesota [Member] | Duke Realty [Member]
Related Party Transaction [Line Items]
Real estate properties partially leased | Property					1							1
Area of property leased | ft²												30,777
Area of real estate property | ft²												322,551
The Company [Member] | Gramercy Europe [Member]
Related Party Transaction [Line Items]
Initial equity capital available							55,892		55,892		€ 50,000
Chief Executive Officer [Member] | Gramercy Europe [Member]
Related Party Transaction [Line Items]
Investments in joint ventures							1,388		1,388		1,250
Managing Directors [Member] | Gramercy Europe [Member]
Related Party Transaction [Line Items]
Investments in joint ventures							$ 1,388		$ 1,388		€ 1,250
Goodman Europe JV [Member]
Related Party Transaction [Line Items]
Ownership %	80.00%	80.00%			5.10%		5.10%	80.00%	5.10%	80.00%	5.10%
Number of Properties | Property					8		8		8		8
Proceeds from sale of investment	$ 148,884	€ 134,336
Gain on sale of investment | $	$ 5,341
Goodman Europe JV [Member] | Gramercy European Property Fund [Member]
Related Party Transaction [Line Items]
Ownership %					94.90%		94.90%		94.90%		94.90%
Ownership percentage acquired								74.90%
Goodman Europe JV [Member] | Lille [Member]
Related Party Transaction [Line Items]
Number of Properties | Property					1
Gramercy European Property Fund [Member]
Related Party Transaction [Line Items]
Ownership %					14.20%		14.20%		14.20%		14.20%
Number of Properties | Property					26		30		30		30
Initial equity capital available							$ 14,283		$ 14,283		€ 12,500
Gramercy Europe Asset [Member]
Related Party Transaction [Line Items]
Ownership %													50.00%
Number of managing directors | director							2		2		2
Subsequent Event [Member] | Gramercy European Property Fund [Member]
Related Party Transaction [Line Items]
Ownership interest sold			100.00%	100.00%
Proceeds from sale of investment			$ 103,802	€ 90,848

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017USD ($)Property	Jun. 30, 2016USD ($)	Jun. 30, 2017USD ($)Property	Jun. 30, 2016USD ($)	Dec. 31, 2016USD ($)Property
Fair Value Disclosures [Abstract]
Change in net unrealized gain (loss) on derivative instruments	$ (2,692)	$ (11,460)	$ 1,686	$ (33,649)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Properties impaired | Property	3		3		1
Assets held for sale, net	$ 14,741		$ 14,741		$ 0
Held for Investment [Member] | Impaired Property [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Properties impaired | Property	2		2
Held for investment	$ 2,138		$ 2,138
Assets Held-for-sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Properties impaired | Property	1		1
Assets held for sale, net	$ 14,741		$ 14,741
Assets Held-for-sale [Member] | Impaired Property [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets held for sale, net	$ 372		$ 372

Fair Value Measurements (Schedu

Fair Value Measurements (Schedule of Carrying Value and Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Retained CDO Bonds [Member]
Financial assets:
Investments	$ 6,345
Carrying Value [Member]
Long-term debt
2015 Revolving Credit Facility	70,955	$ 65,837
Mortgage notes payable	495,404	558,642
Carrying Value [Member] | 3-Year Term Loan [Member]
Long-term debt
Term loans	300,000	300,000
Carrying Value [Member] | 5-Year Term Loan [Member]
Long-term debt
Term loans	750,000	750,000
Carrying Value [Member] | 7-Year Term Loan [Member]
Long-term debt
Term loans	175,000	175,000
Carrying Value [Member] | Senior Unsecured Notes [Member]
Long-term debt
Senior notes	496,584	496,464
Carrying Value [Member] | Exchangeable Senior Notes [Member]
Long-term debt
Senior notes	110,154	108,832
Carrying Value [Member] | Interest Rate Swap [Member]
Financial assets:
Interest rate swaps	5,319	3,769
Financial liabilities:
Interest rate swaps	518	700
Carrying Value [Member] | Retained CDO Bonds [Member]
Financial assets:
Investments	6,345	11,906
Carrying Value [Member] | Marketable securities [Member]
Financial assets:
Investments	100,114	0
Carrying Value [Member] | Investment in CBRE Strategic Partners Asia [Member]
Financial assets:
Investments	3,995	4,145
Carrying Value [Member] | Real Estate Investments [Member]
Financial assets:
Investments	2,510	2,413
Fair Value [Member]
Long-term debt
2015 Revolving Credit Facility	70,876	65,897
Mortgage notes payable	505,761	567,705
Fair Value [Member] | 3-Year Term Loan [Member]
Long-term debt
Term loans	299,038	300,213
Fair Value [Member] | 5-Year Term Loan [Member]
Long-term debt
Term loans	744,502	750,959
Fair Value [Member] | 7-Year Term Loan [Member]
Long-term debt
Term loans	176,590	172,850
Fair Value [Member] | Senior Unsecured Notes [Member]
Long-term debt
Senior notes	507,899	498,650
Fair Value [Member] | Exchangeable Senior Notes [Member]
Long-term debt
Senior notes	117,879	115,625
Fair Value [Member] | Interest Rate Swap [Member]
Financial assets:
Interest rate swaps	5,319	3,769
Financial liabilities:
Interest rate swaps	518	700
Fair Value [Member] | Retained CDO Bonds [Member]
Financial assets:
Investments	6,345	11,906
Fair Value [Member] | Marketable securities [Member]
Financial assets:
Investments	100,114	0
Fair Value [Member] | Investment in CBRE Strategic Partners Asia [Member]
Financial assets:
Investments	3,995	4,145
Fair Value [Member] | Real Estate Investments [Member]
Financial assets:
Investments	$ 2,510	$ 2,413

Fair Value Measurements (Sche69

Fair Value Measurements (Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis) (Details) - Estimate of Fair Value Measurement [Member] - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets:	$ 118,283	$ 22,233
Financial Liabilities:	(518)	(700)
Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Liabilities:	(518)	(700)
Retained CDO Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets:	6,345	11,906
Marketable Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets:	100,114
Investments [Member] | Real Estate Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets:	2,510	2,413
Investments [Member] | Investment in CBRE Strategic Partners Asia [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets:	3,995	4,145
Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets:	5,319	3,769
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets:	100,114	0
Financial Liabilities:	0	0
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Liabilities:	0	0
Fair Value, Inputs, Level 1 [Member] | Retained CDO Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets:	0	0
Fair Value, Inputs, Level 1 [Member] | Marketable Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets:	100,114
Fair Value, Inputs, Level 1 [Member] | Investments [Member] | Real Estate Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets:	0	0
Fair Value, Inputs, Level 1 [Member] | Investments [Member] | Investment in CBRE Strategic Partners Asia [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets:	0	0
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets:	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets:	0	0
Financial Liabilities:	0	0
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Liabilities:	0	0
Fair Value, Inputs, Level 2 [Member] | Retained CDO Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets:	0	0
Fair Value, Inputs, Level 2 [Member] | Marketable Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets:	0
Fair Value, Inputs, Level 2 [Member] | Investments [Member] | Real Estate Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets:	0	0
Fair Value, Inputs, Level 2 [Member] | Investments [Member] | Investment in CBRE Strategic Partners Asia [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets:	0	0
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets:	0	0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets:	18,169	22,233
Financial Liabilities:	(518)	(700)
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Liabilities:	(518)	(700)
Fair Value, Inputs, Level 3 [Member] | Retained CDO Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets:	6,345	11,906
Fair Value, Inputs, Level 3 [Member] | Marketable Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets:	0
Fair Value, Inputs, Level 3 [Member] | Investments [Member] | Real Estate Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets:	2,510	2,413
Fair Value, Inputs, Level 3 [Member] | Investments [Member] | Investment in CBRE Strategic Partners Asia [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets:	3,995	4,145
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets:	$ 5,319	$ 3,769

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value, Assets and Liabilities Measured on Recurring Basis, Valuation Techniques) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap liabilities fair value	$ 518	$ 700
CBRE Strategic Partners Asia [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value	$ 3,995
Discount rate	20.00%
Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Fair Value	$ 4,801
Interest Rate Swap [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap liabilities fair value	$ 518	700
Minimum [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	1.35%
Maximum [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	2.10%
Non-investment grade, subordinate CDO bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value	$ 6,345
Discount rate	16.50%
Non-investment grade, subordinate CDO bonds [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value	$ 6,345	$ 11,906

Fair Value Measurements (Fair71

Fair Value Measurements (Fair Value, Assets (Liabilities) Measured on Recurring Basis, Unobservable Input Reconciliation) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 19,120
Amortization of discounts or premiums	898
Adjustments to fair value:
Unrealized loss in other comprehensive income from fair value adjustment	(1,569)
Other-than-temporary impairments	(4,890)
Total loss on fair value adjustments	(150)
Ending balance	15,141
Adjustments To Fair Value, Assets (Liabilities) [Abstract]
Ineffective portion of change in derivative instruments	46
Unrealized gain on derivatives	1,686
Investment in CBRE Strategic Partners Asia [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	4,145
Adjustments to fair value:
Total loss on fair value adjustments	(150)
Ending balance	3,995
Interest Rate Swap [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	3,069
Adjustments To Fair Value, Assets (Liabilities) [Abstract]
Ineffective portion of change in derivative instruments	46
Unrealized gain on derivatives	1,686
Ending balance	4,801
Retained CDO Bonds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	11,906
Amortization of discounts or premiums	898
Adjustments to fair value:
Unrealized loss in other comprehensive income from fair value adjustment	(1,569)
Other-than-temporary impairments	(4,890)
Ending balance	$ 6,345

Derivatives and Non-Derivativ72

Derivatives and Non-Derivative Hedging Instruments (Schedule of Derivative Instruments) (Details) - Not Designated as Hedging Instrument [Member] £ in Thousands, $ in Thousands	Jun. 30, 2017USD ($)	Jun. 30, 2017GBP (£)
Derivative [Line Items]
Fair Value	$ 4,801
Interest Rate Swap Strike Rate 4.55% [Member]
Derivative [Line Items]
Notional Value	$ 15,038
Strike Rate	4.55%	4.55%
Fair Value	$ (358)
Interest Rate Swap Strike Rate 1.78% [Member]
Derivative [Line Items]
Notional Value	$ 19,240
Strike Rate	1.78%	1.78%
Fair Value	$ (108)
Interest Rate Swap Strike Rate 1.95% [Member]
Derivative [Line Items]
Notional Value	$ 5,815
Strike Rate	1.95%	1.95%
Fair Value	$ (52)
Interest Rate Swap Strike Rate 1.22% [Member]
Derivative [Line Items]
Notional Value	$ 100,000
Strike Rate	1.22%	1.22%
Fair Value	$ 366
Interest Rate Swap Strike Rate 1.23% [Member]
Derivative [Line Items]
Notional Value	$ 100,000
Strike Rate	1.23%	1.23%
Fair Value	$ 360
Interest Rate Swap Strike Rate 1.24% [Member]
Derivative [Line Items]
Notional Value	$ 100,000
Strike Rate	1.24%	1.24%
Fair Value	$ 344
Interest Rate Swap Strike Rate 1.60% [Member]
Derivative [Line Items]
Notional Value	$ 750,000
Strike Rate	1.60%	1.60%
Fair Value	$ 3,566
Interest Rate Swap Strike Rate 1.82% [Member]
Derivative [Line Items]
Notional Value	$ 175,000
Strike Rate	1.82%	1.82%
Fair Value	$ 683
Net Investment Hedge in Euro-denominated Investments [Member]
Derivative [Line Items]
Notional Value	45,000
Fair Value	0
Net Investment Hedge in GBP-denominated Investments [Member]
Derivative [Line Items]
Notional Value | £		£ 15,000
Fair Value	$ 0

Derivatives and Non-Derivativ73

Derivatives and Non-Derivative Hedging Instruments (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Derivative [Line Items]
Gain (loss) on derivative	$ 0	$ 2,564	$ (46)	$ 734
Interest expense	23,239	16,909	46,295	38,862
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative asset, fair value	5,319		5,319
Net liability of derivative	(518)		(518)
Interest expense	271	271	539	631
Amounts reclassified from OCI			1,911
Interest expense to be recognized			2,111
Remaining AOCI balance related to swap to be reclassified in the next twelve months	1,087		1,087
Net Investment Hedge in GBP-denominated Investments [Member]
Derivative [Line Items]
Net liability of derivative	70,955		70,955
Gain (loss) on hedge ineffectiveness	$ (4,196)	$ 970	$ (5,119)	$ (66)

Shareholders' Equity (Deficit74

Shareholders' Equity (Deficit) of the Company (Narrative) (Details)	1 Months Ended				3 Months Ended	6 Months Ended
	Apr. 30, 2017USD ($)$ / sharesshares	Dec. 31, 2016$ / sharesshares	Jul. 31, 2016USD ($)	Jun. 30, 2016shares	Jun. 30, 2017$ / sharesshares	Jun. 30, 2017USD ($)$ / sharesshares	Jun. 30, 2016USD ($)	Feb. 29, 2016USD ($)
Class of Stock [Line Items]
Capital units, authorized (in shares)		500,000,000			500,000,000	500,000,000
Common stock, par value (in usd per share) | $ / shares		$ 0.01			$ 0.01	$ 0.01
Capital stock, par value (in usd per share) | $ / shares		$ 0.01
Common stock, shares authorized (in shares)		490,000,000			490,000,000	490,000,000
Preferred stock, shares authorized (in shares)		10,000,000			10,000,000	10,000,000
Preferred stock, shares outstanding (in shares)					3,500,000	3,500,000
Common stock, shares issued (in shares)		140,647,971			151,889,880	151,889,880
Sales price (in usd per share) | $ / shares	$ 27.60
Proceeds from sale of common shares | $	$ 274,234,000					$ 305,763,000	$ 0
Stock split conversion ratio		0.3333
ESPP shares authorized (in shares)					250,000	250,000
ESPP purchase discount percent					85.00%	85.00%
Shares registered for DRIP (in shares)				3,333,333
Dividend reinvestment program proceeds (in shares)						3,802
Shares available for issuance under DRIP (in shares)					3,328,834	3,328,834
Authorized repurchase amount | $								$ 100,000,000
At-the-market offering | $			$ 375,000,000
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)		3,500,000			3,500,000	3,500,000
Preferred stock, shares outstanding (in shares)		3,500,000			3,500,000	3,500,000
Preferred stock, shares issued (in shares)		3,500,000			3,500,000	3,500,000
IPO [Member]
Class of Stock [Line Items]
Shares issued in public offering (in shares)	10,350,000
Over-Allotment Option [Member]
Class of Stock [Line Items]
Shares issued in public offering (in shares)	1,350,000
At Market Offering Program [Member]
Class of Stock [Line Items]
Issuance of shares (in shares)					0	731,453
Proceeds from sale of stock | $						$ 19,700,000

Shareholders' Equity (Deficit75

Shareholders' Equity (Deficit) of the Company Shareholders' Equity (Deficit) of the Company (Dividends Paid) (Details) - $ / shares	3 Months Ended
	Jun. 30, 2017	Mar. 31, 2017
Equity [Abstract]
Dividends declared (in usd per share)	$ 0.375	$ 0.375

Shareholders' Equity (Deficit76

Shareholders' Equity (Deficit) of the Company (Preferred Stock) (Narrative) (Details) - $ / shares	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Preferred stock, shares outstanding (in shares)	3,500,000
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares outstanding (in shares)	3,500,000	3,500,000
Preferred stock, redemption price per share (in usd per share)	$ 25
7.125% Series A Preferred Stock [Member]
Class of Stock [Line Items]
Dividend rate on preferred stock	7.125%
Preferred stock, dividend rate (in usd per share)	$ 1.78125

Shareholders' Equity (Deficit77

Shareholders' Equity (Deficit) of the Company (Equity Plan Summaries and Earnings Per Share) (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Outside Interests in Operating Partnership [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Antidilutive securities (in shares)	560,443		590,547
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested restricted shares outstanding (in shares)	354,136		354,136		318,807
2016 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)	3,336,525		3,336,525
Grants in period (in shares)			908,985
Shares vesting percentage			73.10%
2016 Equity Incentive Plan [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 755	$ 604	$ 1,572	$ 1,087
Share based compensation expense, not yet recognized	5,089		$ 5,089
Share based compensation expense, not yet recognized, period of recognition			33 months
Outperformance Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	1,070	$ 488	$ 2,126	$ 976
Share based compensation expense, not yet recognized	$ 5,896		$ 5,896
Share based compensation expense, not yet recognized, period of recognition			37 months

Shareholders' Equity (Deficit78

Shareholders' Equity (Deficit) of the Company (Schedule of Calculation of Numerator and Denominator in Earnings Per Share) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator - Income (loss)
Net income (loss) from continuing operations	$ 5,985	$ 23,565	$ (2,087)	$ 17,872
Net income (loss) from discontinued operations	(28)	58	(52)	4,698
Net income (loss) before net gain on disposals	5,957	23,623	(2,139)	22,570
Net gain on disposals	2,002	0	19,379	0
Gain on sale of European unconsolidated equity investment interests held with a related party	0	5,341	0	5,341
Net income	7,959	28,964	17,240	27,911
Net (income) loss attributable to noncontrolling interest	113	(51)	(41)	69
Less: Nonforfeitable dividends allocated to participating shareholders	(337)	(201)	(635)	(400)
Less: Preferred share dividends	(1,558)	(1,558)	(3,117)	(3,117)
Net income available to common shareholders	$ 6,177	$ 27,154	$ 13,447	$ 24,463
Denominator – Weighted average shares
Weighted average basic shares outstanding (in shares)	148,542,916	140,776,976	144,746,251	140,664,885
Effect of dilutive securities
Unvested non-participating share based payment awards (in shares)	86,452	604,464	79,552	604,464
Option (in shares)	19,196	14,539	14,471	10,392
Outside interests in the Operating Partnership (in shares)	0	402,769	0	430,435
Exchangeable Senior Notes (in shares)	1,265,879	715,454	1,125,662	378,414
Diluted shares (in shares)	149,914,443	142,514,202	145,965,936	142,088,590

Shareholders' Equity (Deficit79

Shareholders' Equity (Deficit) of the Company (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Equity [Abstract]
Net unrealized gain (loss) on derivative securities	$ 1,246	$ (440)
Net unrealized gain on debt instruments	2,130	3,699
Foreign currency translation adjustments:
Gain on non-derivative net investment hedges	(603)	4,516
Other foreign currency translation adjustments	(6,109)	(13,045)
Reclassification of swap gain into interest expense	1,681	1,142
Total accumulated other comprehensive loss	$ (1,655)	(4,128)
Write-off on non-derivative net investment hedge		$ 652

Partners' Capital of the Oper80

Partners' Capital of the Operating Partnership (Narrative) (Details) - GPT Operating Partnership LP [Member] - shares	Jun. 30, 2017	Dec. 31, 2016
Limited Partners' Capital Account [Line Items]
Partnership units (in units)	151,517,008
Ownership interest in Operating Partnership	99.64%
Ownership percentage by noncontrolling owners	0.36%
Noncontrolling Interest [Member]
Limited Partners' Capital Account [Line Items]
Partnership units (in units)		545,589

Partners' Capital of the Oper81

Partners' Capital of the Operating Partnership (Calculation of Earnings Per Share) (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Jun. 30, 2017USD ($)shares	Jun. 30, 2016USD ($)shares	Jun. 30, 2017USD ($)shares	Jun. 30, 2016USD ($)shares
Numerator - Income (loss)
Net income (loss) from continuing operations		$ 5,985	$ 23,565	$ (2,087)	$ 17,872
Net income (loss) from discontinued operations		(28)	58	(52)	4,698
Net income (loss) before net gain on disposals		5,957	23,623	(2,139)	22,570
Net gain on disposals		2,002	0	19,379	0
Gain on sale of European unconsolidated equity investment interests held with a related party		0	5,341	0	5,341
Net income		7,959	28,964	17,240	27,911
Less: Nonforfeitable dividends allocated to participating unitholders		(337)	(201)	(635)	(400)
Less: Preferred unit distributions		$ (1,558)	$ (1,558)	$ (3,117)	$ (3,117)
Effect of dilutive securities
Unvested non-participating unit based payment awards (in units) | shares		86,452	604,464	79,552	604,464
Option (in units) | shares		19,196	14,539	14,471	10,392
Exchangeable Senior Notes (in units) | shares		1,265,879	715,454	1,125,662	378,414
Stock split conversion ratio	0.3333
GPT Operating Partnership LP [Member]
Numerator - Income (loss)
Net income (loss) from continuing operations		$ 5,985	$ 23,565	$ (2,087)	$ 17,872
Net income (loss) from discontinued operations		(28)	58	(52)	4,698
Net income (loss) before net gain on disposals		5,957	23,623	(2,139)	22,570
Net gain on disposals		2,002	0	19,379	0
Gain on sale of European unconsolidated equity investment interests held with a related party		0	5,341	0	5,341
Net income		7,959	28,964	17,240	27,911
Less: Net loss attributable to noncontrolling interest in other partnerships		137	27	17	139
Less: Nonforfeitable dividends allocated to participating unitholders		(337)	(201)	(635)	(400)
Less: Preferred unit distributions		(1,558)	(1,558)	(3,117)	(3,117)
Net income available to common unitholders		$ 6,201	$ 27,232	$ 13,505	$ 24,533
Denominator – Weighted average shares
Weighted average basic units outstanding (in units) | shares		149,103,359	141,179,745	145,336,798	141,095,320
Effect of dilutive securities
Unvested non-participating unit based payment awards (in units) | shares		86,452	604,464	79,552	604,464
Option (in units) | shares		19,196	14,539	14,471	10,392
Exchangeable Senior Notes (in units) | shares		1,265,879	715,454	1,125,662	378,414
Diluted shares (in shares) | shares		150,474,886	142,514,202	146,556,483	142,088,590

Noncontrolling Interests (Narra

Noncontrolling Interests (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Dec. 31, 2014
Noncontrolling Interest [Line Items]
Noncontrolling interest in operating partnership (in usd)	$ 6,412	$ 8,643
Noncontrolling interest in other partnerships	$ (363)	$ (321)
Operating Partnership Units [Member]
Noncontrolling Interest [Line Items]
Shares outstanding (in shares)	215,830
Capital shares reserved for future issuance (in shares)	215,830
Shares converted	98,009	156,452
Gramercy Europe Asset [Member]
Noncontrolling Interest [Line Items]
Ownership %			50.00%
Long-term Incentive Plan Units [Member]
Noncontrolling Interest [Line Items]
Capital shares reserved for future issuance (in shares)	329,759
Shares vested (in shares)	329,759
GPT Operating Partnership LP [Member]
Noncontrolling Interest [Line Items]
Ownership percentage by noncontrolling owners	0.36%
Noncontrolling interest in operating partnership (in usd)	$ 6,412	$ 8,643

Noncontrolling Interests (Nonco

Noncontrolling Interests (Noncontrolling Interest in the Operating Partnership) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance at beginning of period	$ 8,643
Redemption of noncontrolling interests in the Operating Partnership	(2,697)
Net income attribution	58
Fair value adjustments	576
Dividends	(168)
Balance at end of period	$ 6,412

Commitments and Contingencies84

Commitments and Contingencies (Narrative) (Details) € in Thousands, $ in Thousands	1 Months Ended
	Jul. 31, 2017	Feb. 28, 2017USD ($)	Jun. 30, 2017USD ($)Property	Jun. 30, 2017EUR (€)Property	Dec. 31, 2016USD ($)
Round Rock [Member]
Commitments And Contingencies [Line Items]
Real Estate Assets			$ 29,605
Commitment amount			57,199
The Company [Member] | Gramercy Europe [Member]
Commitments And Contingencies [Line Items]
Initial equity capital available			55,892	€ 50,000
Minimum [Member]
Commitments And Contingencies [Line Items]
Estimate of possible loss			0
Maximum [Member]
Commitments And Contingencies [Line Items]
Estimate of possible loss			360
Chambers Street Properties [Member]
Commitments And Contingencies [Line Items]
Estimate of possible loss			360
Gramercy European Property Fund [Member]
Commitments And Contingencies [Line Items]
Commitment amount			57,130
Initial equity capital available			14,283	€ 12,500
Strategic Office Partners [Member]
Commitments And Contingencies [Line Items]
Commitment amount			400,000
Investment in unconsolidated equity investment			23,427		$ 16,027
Strategic Office Partners [Member] | Parent Company [Member]
Commitments And Contingencies [Line Items]
Commitment amount			$ 100,000
Operating expense reimbursement audits [Member] | Settled Litigation [Member]
Commitments And Contingencies [Line Items]
Payments for settlement		$ 3,500
Build-to-suit Property [Member] | Round Rock [Member]
Commitments And Contingencies [Line Items]
Properties obligated to build | Property			3	3
Subsequent Event [Member] | Gramercy European Property Fund [Member]
Commitments And Contingencies [Line Items]
Ownership interest sold	100.00%

Commitments and Contingencies85

Commitments and Contingencies (Schedule of Future Minimum Rental Payments) (Details) $ in Thousands	Jun. 30, 2017USD ($)
Ground Leases - Operating
July 1 to December 31, 2017, operating	$ 1,123
2018, operating	2,262
2019, operating	2,271
2020, operating	2,263
2021, operating	2,231
Thereafter, operating	61,857
Total minimum rent expense, operating	72,007
Ground Leases - Capital
July 1 to December 31, 2017, capital	0
2018, capital	1
2019, capital	0
2020, capital	0
2021, capital	0
Thereafter, capital	329
Total minimum rent expense, capital	330
Total
Ground Leases - Operating	1,123
2,018	2,263
2,019	2,271
2,020	2,263
2,021	2,231
Thereafter	62,186
Total	$ 72,337

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 147	$ 2,700	$ (49)	$ 3,403

Supplemental Cash Flow Inform87

Supplemental Cash Flow Information (Non-Cash Activities Recognized in Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Supplemental Cash Flow Elements [Abstract]
Interest paid	$ 44,441	$ 40,639
Income taxes paid	296	743
Proceeds from 1031 exchanges from sale of real estate	170,210	270,429
Use of funds from 1031 exchanges for acquisitions of real estate	(140,987)	(227,521)
Non-cash activity:
Fair value adjustment to noncontrolling interest in the Operating Partnership	576	2,159
Debt assumed in acquisition of real estate	3,680	45,958
Debt transferred in disposition of real estate	(10,456)	(101,432)
Non-cash acquisition of consolidated VIE	24,930	0
Dividend reinvestment plan proceeds	103	0
Distribution of real estate assets from unconsolidated equity investment	0	263,015
Redemption of units of noncontrolling interest in the Operating Partnership for common shares	$ (2,697)	$ (2,204)

Subsequent Events (Narrative) (

Subsequent Events (Narrative) (Details) $ / shares in Units, € in Thousands, $ in Thousands

1 Months Ended

3 Months Ended

6 Months Ended

Aug. 31, 2017$ / shares

Aug. 02, 2017USD ($)ft²Property

Jul. 31, 2017USD ($)

Jul. 31, 2017EUR (€)

Jun. 30, 2017Property$ / shares

Mar. 31, 2017Property$ / shares

Jun. 30, 2016Property

Jun. 30, 2017USD ($)

Jun. 30, 2017

Jun. 30, 2017Property

Jun. 30, 2017land_parcel

Jun. 30, 2016USD ($)Property

Subsequent Event [Line Items]

Proceeds from sale of investment | $

$ 0

$ 47,408

Dividends declared (in usd per share) | $ / shares

$ 0.375

$ 0.375

Number of Acquisitions

21

19

2

Number of real estate properties sold

4

10

Subsequent Event [Member]

Subsequent Event [Line Items]

Dividends declared (in usd per share) | $ / shares

$ 0.375

Dividends declared (in usd per share) | $ / shares

$ 0.44531

Gramercy European Property Fund [Member] | Subsequent Event [Member]

Subsequent Event [Line Items]

Ownership interest sold

100.00%

100.00%

Proceeds from sale of investment

$ 103,802

€ 90,848

Proceeds from sale, promoted interest distribution

$ 8,987

€ 7,865

7.125% Series A Preferred Stock [Member]

Subsequent Event [Line Items]

Dividend rate on preferred stock

7.125%

Series of Individually Immaterial Business Acquisitions [Member] | Subsequent Event [Member]

Subsequent Event [Line Items]

Area of real estate property | ft²

4,012,362

Occupancy rate

100.00%

Real estate acquisitions | $

$ 148,765

Industrial Property [Member] | Series of Individually Immaterial Business Acquisitions [Member] | Subsequent Event [Member]

Subsequent Event [Line Items]

Number of Acquisitions

5

Industrial Land Parcels [Member] | Series of Individually Immaterial Business Acquisitions [Member] | Subsequent Event [Member]

Subsequent Event [Line Items]

Number of Acquisitions

3

Disposed by Sale [Member]

Subsequent Event [Line Items]

Number of real estate properties sold

10

17

Disposed by Sale [Member] | Subsequent Event [Member]

Subsequent Event [Line Items]

Area of real estate property | ft²

95,026

Proceeds from sale of real estate | $

$ 16,355

Disposed by Sale [Member] | Industrial Property [Member] | Subsequent Event [Member]

Subsequent Event [Line Items]

Number of real estate properties sold

1

Disposed by Sale [Member] | Offices [Member]

Subsequent Event [Line Items]

Number of real estate properties sold

2

Disposed by Sale [Member] | Offices [Member] | Subsequent Event [Member]

Subsequent Event [Line Items]

Number of real estate properties sold

5