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INVESTMENTS IN AND ADVANCES TO UNCONSOLIDATED AFFILIATES - Core Portfolio (Details) - Core Portfolio ft² in Thousands, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
May 31, 2016 property | Jan. 31, 2016 USD ($) ft² | Jun. 30, 2016 USD ($) ft² | Jun. 30, 2016 USD ($) ft²
Schedule of Equity Method Investments [Line Items] |  |  |  |
Percentage of interests acquired | 20.00% |  |  |
Consideration transferred | $ |  |  |  | $ 190,286
Number of retail properties (in properties) | property | 17 |  |  |
Crossroads |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity ownership percentage |  |  | 49.00% | 49.00%
Square footage of real estate property (in square feet) |  |  | 311 | 311
Georgetown Portfolio |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity ownership percentage |  |  | 50.00% | 50.00%
Square footage of real estate property (in square feet) |  |  | 28 | 28
Chicago Street Retail Portfolio |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity ownership percentage |  |  | 88.43% | 88.43%
Square footage of real estate property (in square feet) |  |  | 87 | 87
Gotham Plaza |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Square footage of real estate property (in square feet) |  | 123 |  |
Percentage of interests acquired |  | 49.00% |  |
Consideration transferred | $ |  | $ 39,800 |  |
Percentage of long-term debt assumed |  | 49.00% |  |
Debt assumed (included in Mortgage and other notes payable) | $ |  | $ 21,400 |  |
Brandywine Portfolio |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity ownership percentage |  |  | 22.22% | 22.22%
Square footage of real estate property (in square feet) |  |  | 1,000 | 1,000
Repayments of long-term debt | $ |  |  | $ 140,000 |
Washington D.C. |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of retail properties (in properties) | property | 16 |  |  |
Alexandria, Virginia |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of retail properties (in properties) | property | 1 |  |  |

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