Equity Commonwealth (EQC) 10-Q 2010 Q2 Quarterly report

Exhibit 12.1

COMMONWEALTH REIT

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

(dollars in thousands)

	Six Months Ended June 30,						Year Ended December 31,
	2010			2009			2009			2008			2007			2006			2005
Earnings:
Income from continuing operations	$	47,254		$	66,877		$	76,666		$	83,559		$	94,626		$	222,215		$	127,528
Equity in earnings and gains (losses) on equity transactions of equity investments	(21,062		)	(861		)	(6,546		)	—			—			(119,423		)	(26,115		)
Fixed charges	92,763			88,126			173,458			180,193			171,459			165,903			143,663
Distributions from equity investments	7,960			—			4,975			—			—			5,387			22,646
Capitalized interest	—			—			—			—			(489		)	(335		)	—
Adjusted Earnings	$	126,915		$	154,142		$	248,553		$	263,752		$	265,596		$	273,747		$	267,722
Fixed Charges:
Interest expense (including amortization of debt discounts, premiums and deferred financing fees)	$	92,763		$	88,126		$	173,458		$	180,193		$	170,970		$	165,568		$	143,663
Capitalized interest	—			—			—			—			489			335			—
Total Fixed Charges	$	92,763		$	88,126		$	173,458		$	180,193		$	171,459		$	165,903		$	143,663
Ratio of Earnings to Fixed Charges	1.4		x	1.7		x	1.4		x	1.5		x	1.5		x	1.7		x	1.9		x