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ACQUISITION OF REAL ESTATE AND DISCONTINUED OPERATIONS Acquisitions (Details) (USD $) Share data in Millions, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |
Gross leasable area (in square feet) | 510,219 |  |
Core Portfolio |  |  |
Business Acquisition [Line Items] |  |  |
Gross leasable area (in square feet) | 161,032 |  |
Purchase Price | $ 243,709,000 |  |
Assumption of Debt | 29,794,000 |  |
Acquisition costs | 3,100,000 |  |
Fund IV |  |  |
Business Acquisition [Line Items] |  |  |
Gross leasable area (in square feet) | 453,584 |  |
Purchase Price | 59,225,000 |  |
Acquisition costs | 3,000,000 |  |
11 E. Walton | Chicago, IL | Core Portfolio |  |  |
Business Acquisition [Line Items] |  |  |
Gross leasable area (in square feet) | 6,738 |  |
Percent Owned | 100.00% |  |
Purchase Price | 44,000,000 |  |
Assumption of Debt | 0 |  |
61 Main Street | Westport, CT | Core Portfolio |  |  |
Business Acquisition [Line Items] |  |  |
Gross leasable area (in square feet) | 3,400 |  |
Percent Owned | 100.00% |  |
Purchase Price | 7,300,000 |  |
Assumption of Debt | 0 |  |
865 W. North Avenue | Chicago, IL | Core Portfolio |  |  |
Business Acquisition [Line Items] |  |  |
Gross leasable area (in square feet) | 16,000 |  |
Percent Owned | 100.00% |  |
Purchase Price | 14,750,000 |  |
Assumption of Debt | 0 |  |
252-256 Greenwich Avenue | Greenwich, CT | Core Portfolio |  |  |
Business Acquisition [Line Items] |  |  |
Gross leasable area (in square feet) | 9,172 |  |
Percent Owned | 100.00% |  |
Purchase Price | 24,450,000 |  |
Assumption of Debt | 0 |  |
152-154 Spring Street | New York, NY | Core Portfolio |  |  |
Business Acquisition [Line Items] |  |  |
Gross leasable area (in square feet) | 2,936 |  |
Percent Owned | 90.00% |  |
Purchase Price | 38,000,000 |  |
Assumption of Debt | 0 |  |
2520 Flatbush Avenue | Brooklyn, NY | Core Portfolio |  |  |
Business Acquisition [Line Items] |  |  |
Gross leasable area (in square feet) | 29,114 |  |
Percent Owned | 100.00% |  |
Purchase Price | 17,100,000 |  |
Assumption of Debt | 0 |  |
Bedford Green | Bedford Hills, NY | Core Portfolio |  |  |
Business Acquisition [Line Items] |  |  |
Gross leasable area (in square feet) | 90,472 |  |
Percent Owned | 100.00% |  |
Purchase Price | 46,750,000 |  |
Assumption of Debt | 29,794,000 |  |
131-135 Prince Street (1) | New York, NY | Core Portfolio |  |  |
Business Acquisition [Line Items] |  |  |
Gross leasable area (in square feet) | 3,200 |  |
Percent Owned | 100.00% |  |
Purchase Price | 51,359,000 |  |
Assumption of Debt | 0 |  |
Broughton Street Portfolio | Savannah, GA | Fund IV |  |  |
Business Acquisition [Line Items] |  |  |
Gross leasable area (in square feet) | 218,076 | [1] |
Percent Owned | 50.00% | [1] |
Purchase Price | 33,856,000 | [1] |
Number of properties acquired | 24 |  |
Number of properties acquired through asset acquisitions | 9 |  |
Eden Square | Bear, DE | Fund IV |  |  |
Business Acquisition [Line Items] |  |  |
Gross leasable area (in square feet) | 235,508 | [2] |
Percent Owned | 90.00% | [2] |
Purchase Price | 25,369,000 | [2] |
Acquisitions In 2014 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  |
Land | 73,459,000 |  |
Buildings and improvements | 220,375,000 |  |
Total consideration | 293,834,000 |  |
Acquisitions in 2013 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  |
Land | 66,385,000 |  | 52,029,000
Buildings and improvements | 144,617,000 |  | 173,605,000
Acquisition-related intangible assets (in Acquired lease intangibles, net) | 19,574,000 |  | 0
Acquisition-related intangible liabilities (in Acquired lease intangibles, net) | (4,942,000) |  | 0
Total consideration | 225,634,000 |  | 225,634,000
Adjustments [Abstract] |  |  |
Land | 14,356,000 |  |
Buildings and improvements | (28,988,000) |  |
Acquisition-related intangible assets (in Acquired lease intangibles, net) | 19,574,000 |  |
Acquisition-related intangible liabilities (in Acquired lease intangibles, net) | (4,942,000) |  |
Total consideration | $ 0 |  |
Common OP units |  |  |
Business Acquisition [Line Items] |  |  |
Shares issued in connection with the acquisition of a property (in shares) | 1.4 |  |
Common OP units | 131-135 Prince Street (1) |  |  |
Business Acquisition [Line Items] |  |  |
Shares issued in connection with the acquisition of a property (in shares) | 1.4 |  |
[1] | The Broughton Street Portfolio consists of 24 properties. As the joint venture partner to these investments maintains operating control over the investments, these are accounted for under the equity method. Of the 24 properties, nine of them are accounted for as asset acquisitions as they were purchased vacant and require future development.
[2] | As the joint venture partner to this investment maintains operating control over this investment, it is accounted for under the equity method.

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- Definition Amount of real estate acquired, at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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