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ACQUISITION AND DISPOSITION OF REAL ESTATE AND PROPERTIES HELD FOR SALE - Acquisition (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2016 USD ($) ft² shares | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) ft² shares | Jun. 30, 2015 USD ($) | May 31, 2016 | Dec. 31, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 82,098,000 |  | 82,098,000 |  |  |
Reduction to rental income | $ (35,186) | $ (39,784) | $ (73,776) | $ (77,971) |  |
Purchase Price Allocations |  |  |  |  |  |
Land | 89,109 |  | 89,109 |  |  | $ 86,765
Buildings and improvements | 255,808 |  | 255,808 |  |  | 267,551
Acquisition-related intangible assets (in Acquired lease intangibles, net) | 23,071 |  | 23,071 |  |  | 0
Acquisition-related intangible liabilities (in Acquired lease intangibles, net) | (12,951) |  | (12,951) |  |  | 0
Below market debt assumed (in Mortgage and other notes payable) | (11,606) |  | (11,606) |  |  | (10,885)
Total consideration | $ 343,431 |  | 343,431 |  |  | $ 343,431
Adjustments |  |  |  |  |  |
Land |  |  | 2,344 |  |  |
Buildings and improvements |  |  | (11,743) |  |  |
Acquisition-related intangible assets (in Acquired lease intangibles, net) |  |  | 23,071 |  |  |
Acquisition-related intangible liabilities (in Acquired lease intangibles, net) |  |  | (12,951) |  |  |
Below market debt assumed (in Mortgage and other notes payable) |  |  | (721) |  |  |
Total consideration |  |  | $ 0 |  |  |
Core Portfolio |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 436,410 |  | 436,410 |  |  |
Percentage of interests acquired |  |  |  |  | 20.00% |
Purchase Price |  |  | $ 190,286 |  |  |
Assumption of Debt |  |  | 30,472 |  |  |
Acquisition costs |  |  | $ 1,900 |  |  |
Fund IV |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 19,528 |  | 19,528 |  |  |
Purchase Price |  |  | $ 13,750 |  |  |
Assumption of Debt |  |  | 1,463 |  |  |
Acquisition costs |  |  | $ 200 |  |  |
Gotham Plaza | New York, NY | Core Portfolio |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 122,902 |  | 122,902 |  |  |
Percentage of interests acquired | 49.00% |  | 49.00% |  |  |
Purchase Price |  |  | $ 39,808 |  |  |
Assumption of Debt |  |  | $ 10,472 |  |  |
991 Madison Avenue | New York, NY | Core Portfolio |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 6,920 |  | 6,920 |  |  |
Percentage of interests acquired | 100.00% |  | 100.00% |  |  |
Purchase Price |  |  | $ 76,628 |  |  |
Assumption of Debt |  |  | $ 0 |  |  |
165 Newbury Street | Boston, MA | Core Portfolio |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 1,588 |  | 1,588 |  |  |
Percentage of interests acquired | 100.00% |  | 100.00% |  |  |
Purchase Price |  |  | $ 6,250 |  |  |
Assumption of Debt |  |  | $ 0 |  |  |
Renaissance Portfolio | Washington D.C. | Core Portfolio |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 305,000 |  | 305,000 |  |  |
Percentage of interests acquired | 20.00% |  | 20.00% |  |  |
Purchase Price |  |  | $ 67,600 |  |  |
Assumption of Debt |  |  | $ 20,000 |  |  |
1964 Union Street | San Francisco, CA | Fund IV |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 3,817 |  | 3,817 |  |  |
Percentage of interests acquired | 90.00% |  | 90.00% |  |  |
Purchase Price |  |  | $ 2,250 |  |  |
Assumption of Debt |  |  | $ 1,463 |  |  |
Restaurants at Fort Point | Boston, MA | Fund IV |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 15,711 |  | 15,711 |  |  |
Percentage of interests acquired | 100.00% |  | 100.00% |  |  |
Purchase Price |  |  | $ 11,500 |  |  |
Assumption of Debt |  |  | $ 0 |  |  |
Acquisitions in 2016 |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 455,938 |  | 455,938 |  |  |
Purchase Price |  |  | $ 204,036 |  |  |
Assumption of Debt |  |  | 31,935 |  |  |
Increase to depreciation and amortization expense |  |  | 1,900 |  |  |
Reduction to rental income |  |  | 100 |  |  |
Purchase Price Allocations |  |  |  |  |  |
Land | $ 30,419 |  | 30,419 |  |  |
Buildings and improvements | 296,534 |  | 296,534 |  |  |
Debt assumed (included in Mortgage and other notes payable) | (121,371) |  | (121,371) |  |  |
Total consideration | $ 205,582 |  | $ 205,582 |  |  |
Operating Partnership, as General Partner or Managing Member |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Limited partners' capital account, units issued (in shares) | shares | 442,478 |  | 442,478 |  |  |
Series C Preferred Stock | Operating Partnership, as General Partner or Managing Member |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Limited partners' capital account, units issued (in shares) | shares | 141,593 |  | 141,593 |  |  |
Capital Lease Obligations | 991 Madison Avenue |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Lease term | 49 years |  |  |  |  |
Capital lease payments | $ 7,200 |  |  |  |  |

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