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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, 2015 USD ($) ft² residential_unit | Jun. 30, 2015 USD ($) ft² residential_unit | May. 31, 2015 | Apr. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 337,427 | 337,427 |  |  |  |
Core Portfolio |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 265,500 | 265,500 |  |  |  |
Purchase Price |  | $ 184,643 |  |  |  |
Assumption of Debt |  | 9,765 |  |  |  |
Acquisition costs |  | $ 700 |  |  |  |
Fund II |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 0 | 0 |  |  |  |
Purchase Price |  | $ 100,800 |  |  |  |
Assumption of Debt |  | $ 81,000 |  |  |  |
Fund IV |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 59,669 | 59,669 |  |  |  |
Purchase Price |  | $ 84,036 |  |  |  |
Assumption of Debt |  | 0 |  |  |  |
Acquisition costs |  | $ 2,000 |  |  |  |
City Center | San Fransisco, CA | Core Portfolio |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 205,000 | 205,000 |  |  |  |
Percentage of interests acquired | 100.00% | 100.00% |  |  |  |
Purchase Price |  | $ 155,000 |  |  |  |
Assumption of Debt |  | $ 0 |  |  |  |
163 Highland Avenue | Needham, MA | Core Portfolio |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 40,500 | 40,500 |  |  |  |
Percentage of interests acquired | 100.00% | 100.00% |  |  |  |
Purchase Price |  | $ 24,000 |  |  |  |
Assumption of Debt |  | $ 9,765 |  |  |  |
Route 202 Shopping Center | Wilmington, DE | Core Portfolio |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 20,000 | 20,000 |  |  |  |
Percentage of interests acquired | 100.00% | 100.00% |  | 77.78% |  |
Purchase Price |  | $ 5,643 |  |  |  |
Assumption of Debt |  | $ 0 |  |  |  |
City Point - Tower I | Brooklyn, NY | Fund II |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 0 | 0 |  |  |  |
Percentage of interests acquired | 95.00% | 95.00% | 43.00% |  |  |
Purchase Price |  | $ 100,800 |  |  |  |
Assumption of Debt |  | $ 81,000 |  |  |  |
Ownership interest in investment, percentage |  |  |  |  | 52.00% |
Total investment, percentage | 95.00% | 95.00% |  |  |  |
Number of residential units | residential_unit | 250 | 250 |  |  |  |
1035 Third Avenue | New York, NY | Fund IV |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 53,294 | 53,294 |  |  |  |
Percentage of interests acquired | 100.00% | 100.00% |  |  |  |
Purchase Price |  | $ 51,036 |  |  |  |
Assumption of Debt |  | $ 0 |  |  |  |
801 Madison Avenue | New York, NY | Fund IV |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 6,375 | 6,375 |  |  |  |
Percentage of interests acquired | 100.00% | 100.00% |  |  |  |
Purchase Price |  | $ 33,000 |  |  |  |
Assumption of Debt |  | $ 0 |  |  |  |
Acquisitions in 2015 |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gross leasable area (in square feet) | ft² | 325,169 | 325,169 |  |  |  |
Purchase Price |  | $ 369,479 |  |  |  |
Assumption of Debt |  | 90,765 |  |  |  |
Purchase Price Allocations |  |  |  |  |  |
Land | $ 65,759 | 65,759 |  |  |  |
Buildings and improvements | 204,532 | 204,532 |  |  |  |
Above-below market debt assumed (included in Mortgage and other notes payable) | 9,765 | 9,765 |  |  |  |
Total consideration | 260,526 | 260,526 |  |  |  |
Acquisitions In 2014 |  |  |  |  |  |
Purchase Price Allocations |  |  |  |  |  |
Land | 60,571 | 60,571 |  |  |  | $ 43,820
Buildings and improvements | 105,377 | 105,377 |  |  |  | 126,955
Acquisition-related intangible assets (in Acquired lease intangibles, net) | 9,836 | 9,836 |  |  |  | 0
Acquisition-related intangible liabilities (in Acquired lease intangibles, net) | 5,009 | 5,009 |  |  |  | 0
Total consideration | $ 170,775 | 170,775 |  |  |  | $ 170,775
Adjustments |  |  |  |  |  |
Land |  | 16,751 |  |  |  |
Buildings and improvements |  | (21,578) |  |  |  |
Acquisition-related intangible assets (in Acquired lease intangibles, net) |  | 9,836 |  |  |  |
Acquisition-related intangible liabilities (in Acquired lease intangibles, net) |  | (5,009) |  |  |  |
Total consideration |  | $ 0 |  |  |  |
Corporate Joint Venture |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of interests acquired | 10.00% | 10.00% |  |  |  |
Purchase Price | $ 4,200 |  |  |  |  |
Individually Less Than 3 Percent, Variable Interest Rate |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Loans converted | 1,900 | $ 1,900 |  |  |  |
Individually Less Than 3 Percent, Variable Interest Rate | Corporate Joint Venture |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Loans converted | $ 1,900 | $ 1,900 |  |  |  |

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