SUBSEQUENT EVENTS (Details) (USD $)	3 Months Ended				3 Months Ended	1 Months Ended		1 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014 Nonperforming Mortgage Notes Receivable	Mar. 31, 2014 Fund IV	Apr. 30, 2014 Subsequent Event note_receivable	Apr. 30, 2014 Subsequent Event Mortgage Loan, 12.8% Loan, Due 2015	Apr. 30, 2014 Subsequent Event Nonperforming Mortgage Notes Receivable	Apr. 30, 2014 Subsequent Event Sheepshead Bay Property Fund III	Apr. 30, 2014 Subsequent Event Broughton Street Portfolio Fund IV properties	Apr. 30, 2014 Subsequent Event 152-154 Spring Street Manhattan, NY
Subsequent Event [Line Items]
Number of properties acquired										8
Purchase Price					$ 4,900,000				$ 20,200,000	$ 13,800,000	$ 38,000,000
Mortgage loans on real estate, exchange of mortgage for investment											38,000,000
Carrying amount of mortgages	119,639,000		126,656,000	4,800,000			13,000,000				42,000,000
Equity method investment, ownership percentage sold											10.00%
Proceeds from sale of equity method investments											3,800,000
Effective interest rate							12.70%
Number of outstanding non-performing notes receivable, payment received						2
Proceeds from notes receivable	7,156,000	5,529,000						10,300,000
Proceeds from notes receivable, principle								6,800,000
Proceeds from notes receivable, interest								$ 3,500,000