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ACQUISITION AND DISPOSITION OF REAL ESTATE AND DISCONTINUED OPERATIONS Acquisitions (Details) (USD $) | 9 Months Ended | 1 Months Ended |  |  | 9 Months Ended | 1 Months Ended |  | 1 Months Ended
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Sep. 30, 2012 Core Portfolio | Jul. 31, 2012 83 Spring Street New York New York Core Portfolio sqft | Jun. 30, 2012 Shopping Center Washington, D.C. Core Portfolio sqft | May 31, 2012 28 Jericho Turnpike Westbury, New York Core Portfolio sqft | Apr. 30, 2012 930 Rush Street Chicago Illinois Core Portfolio sqft | Mar. 31, 2012 Four Property Portfolio Chicago Illinois Core Portfolio | Feb. 29, 2012 River Street Cambridge Massachusetts Core Portfolio sqft | Jan. 31, 2012 1520 North Milwaukee Avenue Chicago Illinois Core Portfolio sqft | Sep. 30, 2012 Acquisitions in 2012 Purchase Price Allocation As Originally Reported | Sep. 30, 2012 Acquisitions in 2012 Adjustments | Sep. 30, 2012 Acquisitions in 2012 Finalized Purchase Price Allocation | Sep. 30, 2012 Acquisitions in 2012 Preliminary Purchase Price Allocation | Sep. 30, 2012 Acquisitions in 2011 Finalized Purchase Price Allocation | Dec. 31, 2011 Acquisitions in 2011 Preliminary Purchase Price Allocation | Sep. 30, 2012 Fund III | Sep. 30, 2012 Fund III Opportunity Funds | Aug. 31, 2012 Fund III 3104 M Street Washington, D.C. Opportunity Funds sqft | Aug. 31, 2012 Fund III Undeveloped land Mohegan Lake, New York Opportunity Funds | Aug. 31, 2012 Fund III Undeveloped land Farmingdale, New York Opportunity Funds acre | Aug. 31, 2012 Fund III Arundel Plaza Glen Burnie, Maryland Opportunity Funds sqft | Apr. 30, 2012 Fund III Lincoln Park Centre Chicago Illinois Opportunity Funds sqft | Feb. 29, 2012 Fund III 640 Broadway New York New York Opportunity Funds sqft
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Cost of Acquired Entity, Purchase Price |  | $ 11,500,000 | $ 21,700,000 | $ 27,300,000 | $ 20,700,000 | $ 18,800,000 | $ 18,900,000 | $ 3,800,000 |  |  |  |  |  |  |  |  |  | $ 3,000,000 | $ 11,000,000 |  | $ 17,600,000 | $ 31,500,000 | $ 16,300,000
Business Acquisition, Debt Assumption |  |  | 16,500,000 |  |  | 16,000,000 | 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 | 9,300,000 | 19,800,000 |
Acrage of Real Estate Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19.2 |  |  |
Square Footage of Real Estate Property (in square feet) |  | 4,800 | 57,000 | 96,000 | 2,900 |  | 53,300 | 3,100 |  |  |  |  |  |  |  |  |  | 4,900 |  |  | 265,000 | 62,700 | 45,700
Business Combination, Acquisition Related Costs | 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,200,000 |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90.00% |  |
Ownership Interest By General Partner or Managing Partner |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19.90% |  |  |  |  |  |  | 50.00%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land |  |  |  |  |  |  |  |  | 50,870,000 | 4,951,000 | 55,821,000 | 27,084,000 | [1] | 12,150,000 | 5,438,000 |  |  |  |  |  |  |  |
Buildings and Improvements |  |  |  |  |  |  |  |  | 67,303,000 | (7,432,000) | 59,871,000 | 85,592,000 | [1] | 11,009,000 | 18,563,000 |  |  |  |  |  |  |  |
Acquisition-related intangible assets (in Acquired lease intangibles, net) |  |  |  |  |  |  |  |  | 2,482,000 | 3,463,000 | 5,945,000 | 0 | [1] | 1,027,000 | 0 |  |  |  |  |  |  |  |
Acquisition-related intangible liabilities (in Acquired lease and other intangibles, net) |  |  |  |  |  |  |  |  | (4,387,000) | (1,056,000) | (5,443,000) | 0 | [1] | (185,000) | 0 |  |  |  |  |  |  |  |
Above-below market debt assumed (included in Mortgage notes payable) |  |  |  |  |  |  |  |  | 935,000 | 74,000 | 1,009,000 | 0 | [1] |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  |  |  |  | $ 117,203,000 | $ 0 | $ 117,203,000 | $ 112,676,000 | [1] | $ 24,001,000 | $ 24,001,000 |  |  |  |  |  |  |  |
[1] | Represents preliminary allocation for 2012 acquisitions where purchase price allocations have not been finalized

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- Definition The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Percentage of voting equity interests acquired in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6909870&loc=d3e1392-128463 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 59 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=6909708&loc=d3e1043-128460 + Details
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- Definition The number of units or percentage investment held by the managing member or general partner of the LLC or LP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Practice Bulletin (PB) -Number 14 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
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- Definition The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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