CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues:
Rental income	$ 172,407	$ 210,013	$ 344,447	$ 421,313
Tenant reimbursements and other income	42,787	52,175	88,007	103,487
Total revenues	215,194	262,188	432,454	524,800
Expenses:
Operating expenses	92,701	104,105	194,432	208,235
Depreciation and amortization	59,831	63,459	111,480	126,029
General and administrative	24,097	21,049	48,945	37,712
Loss on asset impairment	22,683		17,922
Acquisition related costs		145	5	773
Total expenses	199,312	188,758	372,784	372,749
Operating income	15,882	73,430	59,670	152,051
Interest and other income	281	249	665	704
Interest expense (including net amortization of debt discounts, premiums and deferred financing fees of ($300), $265, ($609) and $873, respectively)	(37,899)	(43,320)	(75,834)	(95,216)
Loss on early extinguishment of debt				(60,027)
(Loss) gain on sale of equity investments	(33)		(33)	66,293
Gain on issuance of shares by an equity investee	16,911		17,020
(Loss) income from continuing operations before income tax expense and equity in earnings of investees	(4,858)	30,359	1,488	63,805
Income tax expense	(908)	(754)	(1,463)	(1,742)
Equity in earnings of investees	12,454	159	23,388	4,421
Income from continuing operations	6,688	29,764	23,413	66,484
Discontinued operations:
Income from discontinued operations	4,114	1,643	8,125	1,637
Loss on asset impairment from discontinued operations	(2,072)	(4,589)	(2,360)	(8,535)
Loss on early extinguishment of debt from discontinued operations	(3,345)		(3,345)
Net gain on sale of properties from discontinued operations		2,099		3,359
Income before gain on sale of properties	5,385	28,917	25,833	62,945
Gain on sale of properties				1,596
Net income	5,385	28,917	25,833	64,541
Net income attributable to noncontrolling interest in consolidated subsidiary		(10,028)		(19,985)
Net income attributable to Equity Commonwealth	5,385	18,889	25,833	44,556
Preferred distributions	(6,982)	(11,151)	(18,133)	(22,302)
Distribution on conversion of preferred shares	(16,205)		(16,205)
Net (loss) income	(17,802)	7,738	(8,505)	22,254
Amounts attributable to Equity Commonwealth common shareholders:
(Loss) income from continuing operations	(16,499)	8,585	(10,925)	25,793
Income from discontinued operations	4,114	1,643	8,125	1,637
Loss on asset impairment from discontinued operations	(2,072)	(4,589)	(2,360)	(8,535)
Loss on early extinguishment of debt from discontinued operations	(3,345)		(3,345)
Net gain on sale of properties from discontinued operations		2,099		3,359
Net (loss) income	$ (17,802)	$ 7,738	$ (8,505)	$ 22,254
Weighted average common shares outstanding - basic and diluted (in shares)	123,812	118,309	121,121	106,298
Basic and diluted earnings per common share attributable to Equity Commonwealth common shareholders:
(Loss) income from continuing operations (in dollars per share)	$ (0.13)	$ 0.07	$ (0.09)	$ 0.24
(Loss) income from discontinued operations (in dollars per share)	$ (0.01)	$ (0.01)	$ 0.02	$ (0.03)
Net (loss) income available for common shareholders (in dollars per share)	$ (0.14)	$ 0.07	$ (0.07)	$ 0.21
Distributions declared per common share (in dollars per share)		$ 0.25	$ 0.25	$ 0.50