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RELATED PARTY TRANSACTIONS (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Related Party Transaction [Line Items]
General and administrative expense	$ 6,618,000	$ 6,385,000	$ 20,873,000	$ 25,503,000
Management and development fees	375,000	551,000	1,356,000	1,779,000
Affiliated Entity | Vornado
Related Party Transaction [Line Items]
General and administrative expense	400,000	400,000	1,300,000	1,500,000
Affiliated Entity | Separation Transaction | Vornado
Related Party Transaction [Line Items]
Payables to related party	0		0
Affiliated Entity | Management Agreement | Vornado
Related Party Transaction [Line Items]
Management and development fee income	400,000	600,000	1,400,000
Affiliated Entity | Management Agreement | Vornado | Accounts Receivable
Related Party Transaction [Line Items]
Management fees receivable	$ 300,000		$ 300,000		$ 700,000
Affiliated Entity | Management Agreement | Vornado | Interstate
Related Party Transaction [Line Items]
Noncontrolling interest percentage	7.10%		7.10%
Affiliated Entity | Management Agreement | Alexander's, Inc. | Vornado
Related Party Transaction [Line Items]
Noncontrolling interest percentage	32.40%		32.40%
Affiliated Entity | Transition Services | Vornado
Related Party Transaction [Line Items]
General and administrative expense	$ 200,000	300,000	$ 600,000	1,200,000
Affiliated Entity | Rent Expense | Vornado
Related Party Transaction [Line Items]
General and administrative expense	$ 200,000	$ 100,000	$ 700,000	$ 300,000

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