CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues:
Rental revenue	$ 55,336	$ 58,763	$ 54,927
Other revenue	5,188	4,377	3,075
Total revenues	60,524	63,140	58,002
Expenses:
Operating expenses	27,462	24,184	25,893
Depreciation and amortization	17,444	17,810	17,774
General and administrative	36,974	30,378	37,444
Total expenses	81,880	72,372	81,111
Interest and other income, net	114,667	46,945	6,800
Gain on sale of properties, net	0	97	0
Income (loss) before income taxes	93,311	37,810	(16,309)
Income tax expense	(1,866)	(453)	(120)
Net income (loss)	91,445	37,357	(16,429)
Net (income) loss attributable to noncontrolling interest	(281)	(94)	33
Net income (loss) attributable to Equity Commonwealth	91,164	37,263	(16,396)
Preferred distributions	(7,988)	(7,988)	(7,988)
Net income (loss) attributable to Equity Commonwealth common shareholders	$ 83,176	$ 29,275	$ (24,384)
Weighted average common shares outstanding — basic (in shares)	108,841	111,674	121,411
Weighted average common shares outstanding — diluted (in shares)	110,185	112,825	121,411
Earnings per common share attributable to Equity Commonwealth common shareholders:
Basic (in dollars per share)	$ 0.76	$ 0.26	$ (0.20)
Diluted (in dollars per share)	$ 0.75	$ 0.26	$ (0.20)