Real Estate Assets Fair Value of Acquisition (Details) (USD $)	Jun. 30, 2012 Unit	Dec. 31, 2011 Unit	Jun. 30, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	81,790,870	20,201,573
Real estate assets	105,754,643	104,265,639
Finance costs	3,641,562	3,894,071
Total assets	353,146,684	297,976,545
Accounts payable, accrued expenses and other liabilities	3,596,921	3,491,642
Mortgages payable	43,231,990	40,092,455
Partners' Capital	189,485,138	131,044,260
Total Liabilities and Partners' Capital	353,146,684	297,976,545
Arboretum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of Units in Real Estate Property	145	145
Business Acquisition, Cost of Acquired Entity, Purchase Price	20,000,000
Eagle Village [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of Units in Real Estate Property	511	511
Cash and cash equivalents			244,923
Restricted cash			589,493
Other current assets			46,380
In-place lease assets			96,829
Real estate assets			12,383,605
Finance costs			108,060
Total assets			13,469,290
Accounts payable, accrued expenses and other liabilities			278,230
Mortgages payable			8,925,000
Partners' Capital			4,266,060
Total Liabilities and Partners' Capital			$ 13,469,290