Segment Reporting (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Summary of Segment Revenues and Net Income
Income from rental operations	$ 13,384,229	$ 12,357,264	$ 40,194,658	$ 36,311,343
Expenses from rental operations	10,741,404	10,257,126	32,131,508	30,200,899
Net operating income	1,725,108	1,657,582	5,875,137	4,381,813
Interest	2,856,550	2,987,208	8,769,953	8,883,543
Depreciation and amortization	2,802,545	2,532,477	8,294,408	7,368,615
Administration of REIT	917,717	442,556	2,188,013	1,728,631
Other (income)/expense	(237,721)	(81,646)	(679,839)	(212,227)
Income from continuing operations	1,962,829	1,739,228	6,554,976	4,594,040
Discontinued operations	(945)	(169,011)	(971)	89,541
Net income	1,961,884	1,570,217	6,554,005	4,683,581
Residential [Member]
Summary of Segment Revenues and Net Income
Income from rental operations	9,203,449	8,010,204	27,845,598	23,675,019
Expenses from rental operations	4,012,436	3,567,696	11,878,699	10,448,577
Net operating income	5,191,013	4,442,508	15,966,899	13,226,442
Interest
Depreciation and amortization
Administration of REIT
Other (income)/expense
Income from continuing operations
Discontinued operations
Net income
Commercial [Member]
Summary of Segment Revenues and Net Income
Income from rental operations	4,180,780	4,347,060	12,349,060	12,636,324
Expenses from rental operations	1,069,873	1,169,745	3,188,448	3,500,164
Net operating income	3,110,907	3,177,315	9,160,612	9,136,160
Interest
Depreciation and amortization
Administration of REIT
Other (income)/expense
Income from continuing operations
Discontinued operations
Net income
Total [Member]
Summary of Segment Revenues and Net Income
Income from rental operations	13,384,229	12,357,264	40,194,658	36,311,343
Expenses from rental operations	5,082,309	4,737,441	15,067,147	13,948,741
Net operating income	8,301,920	7,619,823	25,127,511	22,362,602
Interest	2,856,550	2,987,208	8,769,953	8,883,543
Depreciation and amortization	2,802,545	2,532,477	8,294,408	7,368,615
Administration of REIT	917,717	442,556	2,188,013	1,728,631
Other (income)/expense	(237,721)	(81,646)	(679,839)	(212,227)
Income from continuing operations	1,962,829	1,739,228	6,554,976	459,040
Discontinued operations	(945)	(169,011)	(971)	89,541
Net income	$ 1,961,884	$ 1,570,217	$ 6,554,005	$ 4,683,581