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ACQUISITION AND DISPOSITION OF REAL ESTATE AND PROPERTIES HELD FOR SALE - Acquisition (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) ft² shares | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) ft² shares | Sep. 30, 2015 USD ($) | 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 | $ (35,710) | $ (40,722) | $ (109,486) | $ (118,693) |  |
Purchase Price Allocations |  |  |  |  |  |
Land | 88,068 |  | 88,068 |  |  | $ 83,890
Buildings and improvements | 244,903 |  | 244,903 |  |  | 258,926
Acquisition-related intangible assets (in Acquired lease intangibles, net) | 22,660 |  | 22,660 |  |  | 0
Acquisition-related intangible liabilities (in Acquired lease intangibles, net) | (12,094) |  | (12,094) |  |  | 0
Below market debt assumed (in Mortgage and other notes payable) | 11,606 |  | 11,606 |  |  | 10,885
Total consideration | $ 331,931 |  | 331,931 |  |  | $ 331,931
Adjustments |  |  |  |  |  |
Land |  |  | 4,178 |  |  |
Buildings and improvements |  |  | (14,023) |  |  |
Acquisition-related intangible assets (in Acquired lease intangibles, net) |  |  | 22,660 |  |  |
Acquisition-related intangible liabilities (in Acquired lease intangibles, net) |  |  | (12,094) |  |  |
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 | 820,601 |  | 820,601 |  |  |
Percentage of interests acquired |  |  |  |  | 20.00% |
Purchase Price |  |  | $ 487,225 |  |  |
Assumption of Debt |  |  | 89,682 |  |  |
Acquisition costs |  |  | $ 5,100 |  |  |
Fund IV |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 222,534 |  | 222,534 |  |  |
Purchase Price |  |  | $ 50,350 |  |  |
Assumption of Debt |  |  | 1,463 |  |  |
Acquisition costs |  |  | $ 400 |  |  |
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 |  |  |
Concord and Milwaukee | Chicago, IL | Core Portfolio |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 13,105 |  | 13,105 |  |  |
Percentage of interests acquired | 100.00% |  | 100.00% |  |  |
Purchase Price |  |  | $ 6,000 |  |  |
Assumption of Debt |  |  | $ 2,902 |  |  |
State and Washington | Chicago, IL | Core Portfolio |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 84,604 |  | 84,604 |  |  |
Percentage of interests acquired | 100.00% |  | 100.00% |  |  |
Purchase Price |  |  | $ 70,250 |  |  |
Assumption of Debt |  |  | $ 25,651 |  |  |
151 North State Street | Chicago, IL | Core Portfolio |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 27,385 |  | 27,385 |  |  |
Percentage of interests acquired | 100.00% |  | 100.00% |  |  |
Purchase Price |  |  | $ 30,500 |  |  |
Assumption of Debt |  |  | $ 14,556 |  |  |
North & Kingsbury | Chicago, IL | Core Portfolio |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 41,700 |  | 41,700 |  |  |
Percentage of interests acquired | 100.00% |  | 100.00% |  |  |
Purchase Price |  |  | $ 34,000 |  |  |
Assumption of Debt |  |  | $ 13,409 |  |  |
Sullivan Center | Chicago, IL | Core Portfolio |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 199,122 |  | 199,122 |  |  |
Percentage of interests acquired | 100.00% |  | 100.00% |  |  |
Purchase Price |  |  | $ 146,939 |  |  |
Assumption of Debt |  |  | $ 0 |  |  |
California and Armitage | Chicago, IL | Core Portfolio |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 18,275 |  | 18,275 |  |  |
Percentage of interests acquired | 100.00% |  | 100.00% |  |  |
Purchase Price |  |  | $ 9,250 |  |  |
Assumption of Debt |  |  | $ 2,692 |  |  |
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 |  |  |
Wake Forest Crossing | Wake Forest, NC | Fund IV |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 203,006 |  | 203,006 |  |  |
Percentage of interests acquired | 100.00% |  | 100.00% |  |  |
Purchase Price |  |  | $ 36,600 |  |  |
Assumption of Debt |  |  | $ 0 |  |  |
Series of Individually Immaterial Business Acquisitions |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 1,043,135 |  | 1,043,135 |  |  |
Purchase Price |  |  | $ 537,575 |  |  |
Assumption of Debt |  |  | 91,145 |  |  |
Purchase Price Allocations |  |  |  |  |  |
Land | $ 58,740 |  | 58,740 |  |  |
Buildings and improvements | 291,820 |  | 291,820 |  |  |
Prepaid expenses and other assets | 4,320 |  | 4,320 |  |  |
Acquisition-related intangible assets (in Acquired lease intangibles, net) | 40,554 |  | 40,554 |  |  |
Acquisition-related intangible liabilities (in Acquired lease intangibles, net) | (43,753) |  | (43,753) |  |  |
Debt assumed (included in Mortgage and other notes payable) | (59,601) |  | (59,601) |  |  |
Total consideration | $ 292,080 |  | 292,080 |  |  |
Series of Individually Immaterial Business Acquisitions | Restatement Adjustment |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Increase to depreciation and amortization expense |  |  | 1,900 |  |  |
Reduction to rental income |  |  | $ 100 |  |  |
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 | $ 7,800 |  |  |  |  |

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