CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Rental income	$ 45,719	$ 30,746	$ 126,718	$ 80,040
Expenses
Real estate taxes	4,853	3,292	13,947	8,624
Utility expenses	4,375	2,836	11,422	6,246
Other operating expenses	7,723	5,147	21,568	12,667
Depreciation and amortization	10,379	6,321	27,862	16,602
Acquisition related costs	1,008	2,687	2,846	4,542
General and administrative	2,746	1,833	7,655	4,915
Total expenses	31,084	22,116	85,300	53,596
Operating income	14,635	8,630	41,418	26,444
Interest and other income	54	12	89	80
Interest expense (including net amortization of debt premiums and deferred financing fees of $418, $635, $1,254 and $1,791, respectively)	(3,162)	(1,973)	(8,775)	(5,182)
Equity in earnings (losses) of an investee	28	35	111	(17)
Income before income tax benefit (expense)	11,555	6,704	32,843	21,325
Income tax benefit (expense)	8	(35)	(94)	(71)
Net income	$ 11,563	$ 6,669	$ 32,749	$ 21,254
Weighted average common shares outstanding (in shares)	45,322	36,369	42,127	32,265
Net income per common share (in dollars per share)	$ 0.26	$ 0.18	$ 0.78	$ 0.66