Acquisitions And Development (Tables)

12 Months Ended

Dec. 31, 2011

Acquisitions And Development [Abstract]

Property Acquisitions

Apartment Community	Market Area	Date Acquired		Year Constructed	Number of Units		Cost of Acquisition		Cost of Acquisition Per Unit
Middlebrooke Apartments	Baltimore		4/1/2010	1974-1977		208	$	17,350	$	83
Westbrooke Apartments	Baltimore		4/1/2010	1961-1970		110		6,350		58
Annapolis Roads Apartments(1)	Baltimore		6/17/2010	1974-1979		282		32,500		115
The Greens at Columbia	Baltimore		7/29/2010	1986-1987		168		25,600		152
Village at Potomac Falls	Suburban D.C.		8/5/2010	1999		247		38,500		156
Charleston Place	Baltimore		9/30/2010	1971-1983		858		103,000		120
The Courts at Fair Oaks	Suburban D.C.		9/30/2010	1990		364		70,100		193
Crescent Club Apartments	Long Island		9/30/2010	1973		257		31,250		122
Lakeview Townhomes	Chicago		10/18/2010	1996		120		14,475		121
Hunters Glen	Suburban D.C.		4/19/2011	1984		108		7,000		65
Waterview Apartments	Philadelphia		7/14/2011	1968		203		24,600		121
The Commons at Haynes Farm	Boston		7/15/2011	1991		302		40,500		134
The Apts at Cambridge Court	Baltimore		8/23/2011	1999-2002		544		90,400		166
Somerset Apartments	Suburban D.C.		10/11/2011	2006		108		20,250		188
Newport Village	Suburban D.C.		10/17/2011	1969		937		205,000		219
The Courts at Dulles	Suburban D.C.		11/30/2011	2000		411		92,750		226
The Gates of Deer Grove	Chicago		12/15/2011	1974		204		20,200		99

⁽¹⁾ This apartment community was fee-managed by the Company prior to acquisition.

Pro Forma Financial Information

	2011		2010
Pro forma total revenues	$	613,013	$	583,708
Pro forma net income attributable to common stockholders		41,112		25,285
Pro forma earnings per common share:
Basic		0.98		0.69
Diluted		0.97		0.68