Real Estate Assets Fair Value of Acquisition (Details) (USD $)	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011	Dec. 31, 2011 Arboretum [Member] Unit	Dec. 31, 2011 Eagle Village [Member] Unit	Sep. 30, 2012 Maples on 97th [Member]	Aug. 30, 2012 Maples on 97th [Member] Unit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of Units in Real Estate Property				145	511		258
Other current assets						$ 44,534
In-place lease assets						428,865
Real estate assets	103,571,051		96,041,795			5,071,135
Total assets	395,659,628		297,976,545			5,544,534
Accounts payable, accrued expenses and other liabilities	3,660,766		3,231,360			69,120
Partners' Capital	188,113,258	188,113,258	131,044,260			5,475,414
Total Liabilities and Partners' Capital	395,659,628		297,976,545			5,544,534
Mortgages payable	39,178,128		35,464,455		8,900,000
Business Acquisition, Cost of Acquired Entity, Purchase Price							5,500,000
Real Estate Investment Property, Net				$ 20,000,000