MORTGAGE AND OTHER NOTES PAYABLE - MORTGAGE BY PROPERTY (Details) (Mortgages, USD $)	9 Months Ended			9 Months Ended		9 Months Ended		1 Months Ended		9 Months Ended	1 Months Ended	9 Months Ended	1 Months Ended
	Sep. 30, 2014	Sep. 30, 2014 City Point		Sep. 30, 2014 6.35% Mortgage Note Clark Diversey	Apr. 30, 2014 6.35% Mortgage Note Clark Diversey	Sep. 30, 2014 5.64% Mortgage Note New Loudon Center	Jun. 30, 2014 5.64% Mortgage Note New Loudon Center	Jan. 31, 2014 LIBOR Plus 1.65% Mortgage Note 664 N. Michigan	Jan. 31, 2014 Libor Plus 2.25% Mortgage Note New Hyde Park Shopping Center	Sep. 30, 2014 Libor Plus 2.25% Mortgage Note New Hyde Park Shopping Center	Apr. 30, 2014 Libor Plus 2.25% Mortgage Note New Hyde Park Shopping Center LIBOR	Sep. 30, 2014 Libor Plus 2.25% Mortgage Note Heritage Shops	Feb. 28, 2014 Libor Plus 2.25% Mortgage Note Heritage Shops LIBOR	Feb. 28, 2014 Libor Plus 1.55% Mortgage Note Heritage Shops	Mar. 31, 2014 LIBOR Plus 1.88%, Mortgage Note 654 Broadway	Mar. 31, 2014 LIBOR Plus 1.70% Mortgage Note Paramus Plaza	Apr. 30, 2014 LIBOR Plus 2.15% Mortgage Note Lake Montclair	Apr. 30, 2014 LIBOR Plus 1.85% Mortgage Note New Hyde Park Shopping Center	May 31, 2014 LIBOR Plus 2.35% Mortgage Note 938 W. North	Jun. 30, 2014 LIBOR Plus 1.75%, Mortgage Note 1151 Third Ave	Jul. 31, 2014 5.95% Percent Mortgage Note Bedford Green
Mortgage Loans on Real Estate [Line Items]
Debt instrument face amount	$ 235,408,000	$ 60,514,000	[1]		$ 0		$ 0	$ 45,000,000	$ 1,500,000					$ 24,500,000	$ 9,000,000	$ 12,600,000	$ 15,500,000	$ 12,000,000	$ 12,500,000	$ 12,500,000	$ 29,794,000
Description of variable rate basis								LIBOR	LIBOR		LIBOR		LIBOR	LIBOR	LIBOR	LIBOR	LIBOR	LIBOR	LIBOR	LIBOR
Basis spread on variable rate								1.65%	2.25%		2.25%		2.25%	1.55%	1.88%	1.70%	2.15%	1.85%	2.35%	1.75%
Stated interest rate percentage					6.35%		5.64%														5.95%
Repayments of long-term debt	$ 46,100,000			$ 4,200,000		$ 13,300,000				$ 7,700,000		$ 20,900,000

[1] As of September 30, 2014, $198.5 million of funds have been released under the Company's EB-5 loan relating to its City Point project into a restricted cash account. $149.2 million has been drawn to fund construction activities, with $49.3 million remaining in the restricted cash account at September 30, 2014.