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ACQUISITION AND DISPOSITION OF PROPERTIES AND DISCONTINUED OPERATIONS Acquisitions (Details) (USD $) Share data in Millions, unless otherwise specified |  |  |  | 12 Months Ended | 1 Months Ended | 12 Months Ended |
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Dec. 31, 2013 Acquisitions in 2013 [Member] Preliminary Purchase Price Allocation [Member] | Dec. 31, 2012 Acquisitions in 2012 [Member] Preliminary Purchase Price Allocation [Member] | Dec. 31, 2013 Acquisitions in 2012 [Member] Finalized Purchase Price Allocation, Adjustment [Member] | Dec. 31, 2013 Acquisitions in 2012 [Member] Finalized Purchase Price Allocation [Member] | Dec. 31, 2013 Core Portfolio [Member] sqft | Dec. 31, 2013 Core Portfolio [Member] 664 North Michigan Avenue [Member] Chicago, Illinois [Member] sqft | Dec. 31, 2013 Core Portfolio [Member] 8-12 East Walton [Member] Chicago, Illinois [Member] sqft | Dec. 31, 2013 Core Portfolio [Member] 3200 - 3204 M Street [Member] Washington, D.C. [Member] sqft | Dec. 31, 2013 Core Portfolio [Member] 868 Broadway [Member] New York New York [Member] sqft | Dec. 31, 2013 Core Portfolio [Member] 313 - 315 Bowery [Member] New York New York [Member] sqft | Dec. 31, 2013 Core Portfolio [Member] 120 West Broadway [Member] New York New York [Member] sqft | Dec. 31, 2013 Fund III [Member] | May 31, 2012 Fund III [Member] Brooklyn, New York [Member] sqft | Apr. 30, 2012 Fund III [Member] Brooklyn, New York [Member] | Dec. 31, 2013 Fund IV [Member] sqft | Dec. 31, 2013 Fund IV [Member] AMCB Kennedy LLC [Member] North Bergen, New Jersey [Member] sqft | Dec. 31, 2013 Fund IV [Member] Promenade at Manassas [Member] Manassas, Virginia [Member] sqft | Dec. 31, 2013 Fund IV [Member] Paramus Plaza [Member] Paramus, New Jersey [Member] sqft | Dec. 31, 2013 Fund IV [Member] 1151 Third Avenue [Member] New York New York [Member] sqft | Dec. 31, 2013 Fund IV [Member] Lake Montclair [Member] Dumfries, Virginia [Member] sqft | Dec. 31, 2013 Fund IV [Member] 938 West North Avenue [Member] Chicago, Illinois [Member] sqft | Dec. 31, 2013 Fund II [Member] sqft
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
GLA (in square feet) |  |  |  |  | 56,004 | 18,141 | 8,244 | 7,000 | 2,031 | 6,600 | 13,988 | [1] |  |  |  | 624,378 | 53,680 | [2] | 265,442 | [2] | 152,118 | 12,288 | 105,850 | 35,000 | 981,800
Percent Owned |  |  |  |  |  | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | [1] |  | 99.00% |  |  | 90.00% | [2] | 90.00% | [2] | 50.00% | 100.00% | 100.00% | 80.00% |
Purchase Price |  |  |  |  | $ 176,900,000 | $ 86,600,000 | $ 22,500,000 | $ 11,800,000 | $ 13,500,000 | $ 5,500,000 | $ 37,000,000 | [1] |  |  |  | $ 123,200,000 | $ 9,000,000 | [2] | $ 38,000,000 | [2] | $ 18,900,000 | $ 18,000,000 | $ 19,300,000 | $ 20,000,000 |
Liabilities Incurred |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,000,000 |  |  |  |  |  |  |  |  |  |
Issuance of OP Units in Exchange for Ownership, Number of Shares |  |  |  |  |  |  |  |  |  |  | 1.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition Related Costs |  |  |  |  | 2,700,000 |  |  |  |  |  |  |  | 800,000 |  |  | 2,000,000 |  |  |  |  |  |  |  |  |
Note receivable, discounted price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,500,000 |  |  |  |  |  |  |  |  |  |
Property pledged as collateral, area of property |  |  |  |  |  |  |  |  |  |  |  |  |  | 79,526 |  |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting interests acquired, counterparty interest |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Purchase Price Allocation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land | 65,829,000 | 86,826,000 | 30,312,000 | 117,138,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Buildings and Improvements | 253,724,000 | 226,650,000 | (32,440,000) | 194,210,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition-related intangible assets (in Acquired lease intangibles, net) |  | 0 | 31,965,000 | 31,965,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition-related intangible liabilities (in Acquired lease intangibles, net) |  | 0 | (27,592,000) | (27,592,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Above-below market debt assumed (included in Mortgages and other notes payable) |  | 0 | (2,245,000) | (2,245,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Consideration | $ 319,553,000 | $ 313,476,000 | $ 0 | $ 313,476,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | This acquisition was primarily funded with the issuance of 1.2 million OP Units.
[2] | As the joint venture partners to these investments maintain operating control over the investments, these are accounted for under the equity method.

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