CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash Flows from Operating Activities
Net income	$ 13,856,859	$ 6,668,049
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	4,323,297	4,538,498
Amortization	1,313,904	811,292
Stock-based compensation	1,236,000	1,041,762
Impairment charge	0	13,500,000
Gain on extinguishment of debt	0	(2,360,231)
Gain on sale of assets	(1,746,750)	0
(Increase) decrease in accounts receivable	(592,064)	(1,339,377)
(Increase) decrease in other assets	(1,463,254)	81,064
(Decrease) increase in accounts payable	(1,978,649)	205,451
Decrease in deferred revenue	(347,535)	(6,835,746)
Increase (decrease) in accrued interest	(242,269)	253,275
Increase (decrease) in tenant deposits	(19,814)	12,832
Net Cash Provided by Operating Activities	14,339,725	16,576,869
Cash Flows from Investing Activities
Acquisition of real estate investments	(44,849,100)	(20,525,240)
Payment of leasing costs	(14,241)	(150,597)
Net proceeds from sale of assets	15,330,481	6,522,821
Increase in restricted cash	(3,280,616)	0
Net Cash Used In Investing Activities	(32,813,476)	(14,153,016)
Cash Flows from Financing Activities
Proceeds from common stock offering	35,042,235	0
Line-of-credit borrowings	59,062,100	45,107,904
Line-of-credit repayments	(60,665,998)	(30,103,254)
Payments of mortgages payable	(2,328,560)	(3,459,816)
Dividends and limited partners' distributions paid	(13,506,531)	(13,318,319)
Repayments of payables for capital expenditures	(424,321)	(286,078)
Payments for financing costs	(164,851)	(70,784)
Net Cash Provided by (Used In) Financing Activities	17,014,074	(2,130,347)
Net Increase (Decrease) in Cash and Cash Equivalents	(1,459,677)	293,506
Cash and Cash Equivalents, beginning of period	2,002,663	593,281
Cash and Cash Equivalents, end of period	542,986	886,787
Supplemental Disclosure of Cash Flow Information
Cash paid for interest (net of amounts capitalized)	3,412,222	3,447,396
Supplemental Disclosure of Non-Cash Investing and Financing Activities
Shares issued under Stock Incentive Plan	2,175,831	2,312,056
Dividends and limited partners' distributions declared and unpaid	4,711,946	4,068,677
Real estate investments financed with accounts payable	35,045	54,321
Forgiveness of mortgage debt	9,173,789	0
Real estate acquisitions financed with debt assumption	$ 18,220,528	$ 0