Exhibit 12.1

Statement re Computation of Ratios

	Year Ended December 31,
	2008			2007		2006		2005		2004
Operating Data:
Revenues	$	493,421		436,582		404,034		371,411		335,836
Operating expenses		277,064		247,835		231,857		197,561		187,291
Other expenses (income)		107,293		30,174		13,748		82,760		39,540
Minority interests		5,152		6,097		10,568		9,948		21,983
Equity in income (loss) of investments in real estate partnerships		5,292		18,093		2,580		(2,907	)	9,962
Income from continuing operations		109,204		170,569		150,441		78,235		96,984
Income from discontinued operations		26,984		33,082		68,070		69,505		40,911
Net income		136,188		203,651		218,511		147,740		137,895
Preferred stock dividends		19,675		19,675		19,675		16,744		8,633
Net income for common stockholders		116,513		183,976		198,836		130,996		129,262
Fixed Coverage Ratio:
Continuing Operations (before MI)	$	109,064		158,573		158,429		91,090		109,005
Add (Subtract): tax expense (benefit)		(1,600	)	4,197		11,772		(536	)	4,751
Subtract: MI (without own fixed charges)		(41	)	(869	)	(4,752	)	(83	)	(64	)
Add (Subtract): equity in income of unconsolidated partnerships		(5,292	)	(18,093	)	(2,580	)	2,907		(9,962	)
Add: distributions from operations JV's (CF)		30,730		30,547		28,788		28,661		13,342
Add: distributions from investment JV's (CF)		28,923		41,372		13,452		30,918		47,369
Add: fixed charges		157,390		144,292		130,932		126,255		123,327
Subtract: preferred unit and stock distributions		(23,400	)	(23,400	)	(23,400	)	(24,849	)	(28,462	)
Subtract: capitalized interest		(36,511	)	(35,424	)	(23,952	)	(12,400	)	(11,228	)
Earnings	$	259,263		301,195		288,689		241,963		248,078
Fixed Charge Data:
Preferred unit distribution	$	3,725		3,725		3,725		8,105		19,829
Preferred stock dividend		19,675		19,675		19,675		16,744		8,633
Interest expense (per consolidation)		97,479		85,468		83,580		89,006		83,637
Capitalized interest (per consolidation or C/F)		36,511		35,424		23,952		12,400		11,228
Total fixed charges	$	157,390		144,292		130,932		126,255		123,327
Ratio of earnings to fixed charges		1.6		2.1		2.2		1.9		2.0