Exhibit 12.1

HRPT PROPERTIES TRUST

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

(dollars in thousands)

	Nine Months Ended September 30,						Year Ended December 31,
	2006			2005			2005			2004			2003			2002			2001
Earnings:
Income before equity in earnings and gains (losses) on equity transactions of equity investments	$	93,280		$	106,630		$	138,869		$	117,386		$	90,921		$	88,923		$	87,510
Fixed charges	126,317			105,967			143,663			118,212			101,144			89,417			91,305
Distributions from equity investments	5,387			16,954			22,646			24,572			27,404			27,195			26,651
Capitalized interest	—			—			—			—			—			(3,057		)	(787		)
Adjusted Earnings	$	224,984		$	229,551		$	305,178		$	260,170		$	219,469		$	202,478		$	204,679
Fixed Charges:
Interest expense (including amortization of note discounts and premiums and deferred financing fees)	$	126,317		$	105,967		$	143,663		$	118,212		$	101,144		$	86,360		$	90,518
Capitalized interest	—			—			—			—			—			3,057			787
Total Fixed Charges	$	126,317		$	105,967		$	143,663		$	118,212		$	101,144		$	89,417		$	91,305
Ratio of Earnings to Fixed Charges	1.8		x	2.2		x	2.1		x	2.2		x	2.2		x	2.3		x	2.2		x