Consolidated Statements of Cash Flows (USD $)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash Flows From Operating Activities
Net income	$ 8,523,393	$ 14,399,940
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	2,987,351	2,869,498
Amortization	387,317	171,959
Stock-based compensation	718,714	562,000
Gain on sale of asset		(5,328,333)
(Increase) Decrease in accounts receivable	(1,340,828)	(1,018,269)
(Increase) Decrease in other assets	109,001	63,273
(Increase) Decrease in accounts payable	211,558	(373,981)
Decrease in deferred revenue	(344,775)	(344,775)
Increase (Decrease) in accrued interest	52,063	(41,690)
Increase (Decrease) in tenant deposits	3,167	(10,103)
Net Cash Provided By Operating Activities	11,306,961	10,949,519
Cash Flows From Investing Activities
Acquisition of real estate investments (including capitalized interest of $-0- in 2011 and $148,507 in 2010)	(4,223,710)	(11,564,231)
Proceeds from sale of asset	6,522,821	9,761,601
Payments of leasing costs	(36,756)	(64,210)
Increase in cash - restricted		(2,096,699)
Net Cash Provided By (Used In) Investing Activities	2,262,355	(3,963,539)
Cash Flows From Financing Activities
Proceeds from common stock offering		31,074,028
Payments of mortgages payable	(2,725,931)	(1,977,983)
Dividends and limited partners' distributions paid	(9,236,347)	(8,760,215)
Line-of-credit borrowings	16,905,045	11,385,005
Line-of-credit (repayments)	(17,956,395)	(38,685,005)
Repayments of capital expenditure payables	(286,078)	(352,430)
Payments of financing costs	(11,034)	(649)
Net Cash Used In Financing Activities	(13,310,740)	(7,317,249)
Net Decrease In Cash and Cash Equivalents	258,576	(331,269)
Cash and Cash Equivalents, beginning of period	593,281	688,675
Cash and Cash Equivalents, end of period	851,857	357,406
Supplemental Disclosure of Cash Flow Information
Cash paid for interest (net of amounts capitalized)	2,333,130	2,304,508
Supplemental Disclosure of Non-Cash Transactions
Dividends and limited partners' distributions declared and unpaid	4,075,324	5,131,722
Real estate investments financed with accounts payable	$ 456,162	$ 1,689,409