CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues:
Rental income	$ 163,697	$ 172,407	$ 331,669	$ 344,447
Tenant reimbursements and other income	39,997	42,787	85,080	88,007
Total revenues	203,694	215,194	416,749	432,454
Expenses:
Operating expenses	89,686	92,701	187,557	194,432
Depreciation and amortization	53,637	59,831	116,336	111,480
General and administrative	10,911	24,097	27,469	48,945
Loss on asset impairment	15,258	22,683	17,162	17,922
Acquisition related costs	0	0	0	5
Total expenses	169,492	199,312	348,524	372,784
Operating income	34,202	15,882	68,225	59,670
Interest and other income	728	281	4,176	665
Interest expense (including net amortization of debt discounts, premiums and deferred financing fees of $(177), $(300), $(148) and $(609), respectively)	(27,973)	(37,899)	(57,815)	(75,834)
Gain on early extinguishment of debt	10,426	0	9,998	0
Loss on sale of equity investment	0	(33)	0	(33)
Gain on issuance of shares by an equity investee	0	16,911	0	17,020
Foreign currency exchange gain	856	0	856	0
(Loss) gain on sale of properties	(2,708)	0	3,160	0
Income (loss) from continuing operations before income taxes and equity in earnings of investees	15,531	(4,858)	28,600	1,488
Income tax expense	(2,915)	(908)	(2,354)	(1,463)
Equity in earnings of investees	0	12,454	0	23,388
Income from continuing operations	12,616	6,688	26,246	23,413
Discontinued operations:
Income from discontinued operations	0	4,114	0	8,125
Loss on asset impairment from discontinued operations	0	(2,072)	0	(2,360)
Loss on early extinguishment of debt from discontinued operations	0	(3,345)	0	(3,345)
Net income	12,616	5,385	26,246	25,833
Preferred distributions	(6,981)	(6,982)	(13,962)	(18,133)
Excess fair value of consideration over carrying value of preferred shares	0	(16,205)	0	(16,205)
Net income (loss) attributable to Equity Commonwealth common shareholders	5,635	(17,802)	12,284	(8,505)
Amounts attributable to Equity Commonwealth common shareholders:
Income (loss) from continuing operations	5,635	(16,499)	12,284	(10,925)
Income from discontinued operations	0	4,114	0	8,125
Loss on asset impairment from discontinued operations	0	(2,072)	0	(2,360)
Loss on early extinguishment of debt from discontinued operations	0	(3,345)	0	(3,345)
Net income (loss) attributable to Equity Commonwealth common shareholders	$ 5,635	$ (17,802)	$ 12,284	$ (8,505)
Weighted average common shares outstanding — basic (in shares)	129,733	123,812	129,714	121,121
Weighted average common shares outstanding — diluted (in shares)	130,537	123,812	130,205	121,121
Basic and diluted earnings per common share attributable to Equity Commonwealth common shareholders:
Income (loss) from continuing operations (in dollars per share)	$ 0.04	$ (0.13)	$ 0.09	$ (0.09)
(Loss) income from discontinued operations (in dollars per share)	0.00	(0.01)	0.00	0.02
Net income (loss) (in dollars per share)	0.04	(0.14)	0.09	(0.07)
Distributions declared per common share (in dollars per share)	$ 0	$ 0	$ 0	$ 0.25