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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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