Mortgages Payable Mortgage Payable by Property (Details) (USD $)			3 Months Ended			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2013 Maples on 97th [Member]	Dec. 31, 2013 Real Estate [Member]	Dec. 31, 2012 Real Estate [Member]	Dec. 31, 2013 Real Estate [Member] Arboretum [Member]		Dec. 31, 2012 Real Estate [Member] Arboretum [Member]		Dec. 31, 2013 Real Estate [Member] Eagle Village [Member]		Dec. 31, 2012 Real Estate [Member] Eagle Village [Member]		Dec. 31, 2013 Real Estate [Member] Glynn Place [Member]		Dec. 31, 2012 Real Estate [Member] Glynn Place [Member]		Dec. 31, 2013 Real Estate [Member] Maples on 97th [Member]		Dec. 31, 2013 Real Estate [Member] Residences at DeCordova [Member]		Dec. 31, 2012 Real Estate [Member] Residences at DeCordova [Member]		Dec. 31, 2013 Real Estate [Member] Residences at Weatherford [Member]		Dec. 31, 2012 Real Estate [Member] Residences at Weatherford [Member]		Dec. 31, 2013 Real Estate [Member] The 50/50 Student Housing--UNL [Member]		Dec. 31, 2013 Real Estate [Member] Woodland Park [Member]
Mortgage Loans on Real Estate [Line Items]
Long-term Debt	$ 57,087,320	$ 39,119,507	$ 7,500,000	$ 57,087,320	$ 39,119,507	$ 17,500,000		$ 17,500,000		$ 8,828,435		$ 8,925,000		$ 1,845,058		$ 4,252,836		$ 7,500,000		$ 1,948,064		$ 1,995,628		$ 6,268,311		$ 6,446,043		$ 7,177,438		$ 6,020,014
Date of Debt Borrowing						2011		2011		2010		2010		2008		2008		2013		2012		2012		2011		2011		2013		2013
Long Term Debt, Maturity date at a point in time			Feb. 10, 2016			Mar. 01, 2014		Mar. 01, 2014		Jun. 01, 2014		Jun. 01, 2013		May 01, 2014		May 01, 2013		Mar. 01, 2016		Feb. 01, 2017		Feb. 01, 2017		Jul. 01, 2015		Jul. 01, 2015		Mar. 01, 2020		Mar. 01, 2014
Debt Instrument, Interest Rate, Effective Percentage						5.32%	[1]	5.25%	[1]	4.04%	[1]	3.50%	[1]	2.81%	[1]	2.78%	[1]	3.47%	[1]	5.00%	[1]	5.01%	[1]	5.90%	[1]	5.84%	[1]	3.25%	[1]	2.97%	[1]

[1] Represents the average effective interest rate, including fees, for the years ended December 31, 2013 and 2012 and excludes the effect of interest rate caps (Note 15).