Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
OPERATING ACTIVITIES
Net income	$ 6,554,005	$ 4,683,581
Adjustments to reconcile net income to net cash from operating activities
Gain on sale of property and equipment	(114,307)	(366,990)
Loss on sale of property and equipment	87,971	66,921
Equity in income of unconsolidated affiliates	(618,971)	(22,347)
Depreciation	7,154,638	6,607,536
Amortization	1,140,887	785,989
Effects on operating cash flows due to changes in
Tenant security deposits	(104,339)	(117,124)
Due from related party	114,049	65,892
Receivables	(332,330)	(301,991)
Prepaid expenses	570,260	400,509
Other assets	582,800	(748,935)
Due to related party	76,340	(128,202)
Tenant security deposits payable	169,014	162,175
Accounts payable	97,441	(123,247)
Accrued expenses	2,396,425	2,082,994
NET CASH FROM OPERATING ACTIVITIES	17,773,883	13,046,761
INVESTING ACTIVITIES
Purchase of property and equipment	(9,618,113)	(4,867,970)
Purchase of intangible assets	(683,836)	(1,483,434)
Proceeds from sale of property and equipment	932,513	2,819,355
Investment in unconsolidated affiliates	(80,726)	(284,335)
Distributions received from unconsolidated affiliates	794,700	7,000
Real estate tax and insurance escrows	(3,011,389)	(1,911,266)
Notes receivable payments received	1,580,290	39,301
Notes receivable issued for tenant improvements		(33,000)
Payments for earnest money deposits	(150,000)
Deferred insurance proceeds	301	395,750
Net deposits to replacement reserve	(9,513)	(137,263)
Net payments from exchange escrow		2,312,927
NET CASH (USED FOR) INVESTING ACTIVITIES	(10,245,773)	(3,142,935)
FINANCING ACTIVITIES
Payments for financing costs	(164,037)	(719,349)
Payments on investment certificates	(72,001)	(823,089)
Principal payments on special assessments payable	(662)
Proceeds from issuance of mortgage notes payable	5,346,337	7,603,199
Principal payments on mortgage notes payable	(14,581,245)	(11,362,049)
Net change in short-term notes payable	(3,950,000)
Proceeds from issuance of shares	18,266,125	2,075,445
Repurchase of shares	(3,658,636)	(1,847,406)
Dividends paid	(7,679,526)	(6,974,635)
Payment of syndication costs	(1,158,404)	(510,634)
NET CASH FLOWS (USED FOR) FINANCING ACTIVITIES	(7,652,049)	(12,558,518)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(123,939)	(2,654,692)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	3,192,785	10,010,564
CASH AND CASH EQUIVALENTS AT END OF PERIOD	3,068,846	7,355,872
SCHEDULE OF CASH FLOW INFORMATION
Cash paid during the period for interest, net of capitalized interest	8,883,142	8,949,256
SUPPLEMENTARY SCHEDULE OF NONCASH INVESTING AND FINANCING ACTIVITIES
Dividends reinvested	1,661,236	1,385,267
Dividends declared and not paid	1,050,398	759,762
UPREIT distributions declared and not paid	2,285,387	2,172,538
UPREIT units converted to REIT common shares	1,590,961	806,449
Acquisition of assets in exchange for the issuance of noncontrolling interest shares in UPREIT	4,058,618	7,109,332
Increase in land improvements due to increase in special assessments payable	315,607	77,337
Unrealized (gain) loss on interest rate swap	64,364	246,176
Acquisition of assets with reduction of notes receivable		89,349
Acquisition of assets through assumption of debt and property purchased with financing	$ 5,070,054	$ 10,972,257