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ACQUISITION AND DISPOSITION OF REAL ESTATE AND DISCONTINUED OPERATIONS Acquisitions (Details) (USD $) | 9 Months Ended | 1 Months Ended |  | 1 Months Ended |  |  |
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 Core Portfolio | Sep. 30, 2013 Fund IV | Apr. 30, 2012 Brooklyn, New York Fund III sqft | Mar. 31, 2013 664 North Michigan Avenue [Member] Chicago Illinois Core Portfolio sqft | Jun. 30, 2013 Eight-Twelve East Walton Chicago Illinois Core Portfolio sqft | Jun. 30, 2013 3200 -3204 M Street Washington, D.C. Core Portfolio sqft | Feb. 28, 2013 Shopping Center Brooklyn, New York Fund III | Aug. 31, 2013 Twenty Eight Nineteen Kennedy Boulevard North Bergen, New Jersey Fund IV sqft | Jun. 30, 2013 Twenty Eight Nineteen Kennedy Boulevard North Bergen, New Jersey Fund IV sqft | Jun. 30, 2013 Promenade at Manassas Manassas, Virginia Fund IV sqft | Sep. 30, 2013 Acquisitions in 2013 Preliminary Purchase Price Allocation | Dec. 31, 2012 Acquisitions in 2012 Preliminary Purchase Price Allocation | Sep. 30, 2013 Acquisitions in 2012 Scenario, Adjustment | Sep. 30, 2013 Acquisitions in 2012 Finalized Purchase Price Allocation
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Square Footage of Real Estate Property (in square feet) |  |  |  |  | 79,526 | 18,141 | 8,244 | 7,000 |  | 152,118 | 53,680 | 265,442 |  |  |  |
Business Acquisition, Cost of Acquired Entity, Purchase Price |  |  |  |  |  | $ 86,600,000 | $ 22,500,000 | $ 11,800,000 |  | $ 18,900,000 | $ 9,000,000 | $ 38,000,000 |  |  |  |
Business Combination, Acquisition Related Costs |  |  | 1,600,000 | 1,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Notes Receivable | 0 | 34,500,000 |  |  | 18,500,000 |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  | 23,000,000 |  |  |  |  |  |  |  |  |  |  |
Consolidated Joint Venture, Ownership Percentage |  |  |  |  |  |  |  |  | 99.00% | 50.00% | 98.00% | 99.00% |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land |  |  |  |  |  |  |  |  |  |  |  |  | 47,242,000 | 38,028,000 | 2,819,000 | 40,847,000
Buildings and improvements |  |  |  |  |  |  |  |  |  |  |  |  | 159,045,000 | 80,997,000 | (1,971,000) | 79,026,000
Acquisition-related intangible assets (in Acquired lease intangibles, net) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 11,069,000 | 11,069,000
Acquisition-related intangible liabilities (in Acquired lease intangibles, net) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (9,672,000) | (9,672,000)
Below market debt assumed (in Mortgage and other notes payable) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (2,245,000) | (2,245,000)
Total consideration |  |  |  |  |  |  |  |  |  |  |  |  | $ 206,287,000 | $ 119,025,000 | $ 0 | $ 119,025,000

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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings and Improvements + References No definition available. + Details
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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets + References No definition available. + Details
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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Liabilities + References No definition available. + Details
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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Above-Below Market Debt + References No definition available. + Details
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- Definition Area of a real estate property. + References No definition available. + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: 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=25497992&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 Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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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=6910749&loc=d3e4845-128472 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + 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=6910749&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 + Details
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- Definition The cash outflow to acquire an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among myriad other features and characteristics. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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