Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Buildings And Improvements

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Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangible Liabilities

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Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings and Improvements

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Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Above-Below Market Debt

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Gross Leasable Area

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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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.

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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.

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to financial liabilities assumed in connection with a business combination for which the initial accounting was incomplete.

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This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to intangibles acquired in connection with a business combination for which the initial accounting was incomplete.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of real estate acquired, at the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of limited partner units issued.

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The total amount of lease revenue recognized for the period for which the lessee was obligated under leasing arrangements regardless of any other events or conditions. This amount excludes contingent revenue and sublease revenue.

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ACQUISITION AND DISPOSITION OF REAL ESTATE AND PROPERTIES HELD FOR SALE - Acquisition (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($) ft² shares	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) ft² shares	Sep. 30, 2015 USD ($)	May 31, 2016	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Gross leasable area (in square feet) \| ft²	82,098,000		82,098,000
Reduction to rental income	$ (35,710)	$ (40,722)	$ (109,486)	$ (118,693)
Purchase Price Allocations
Land	88,068		88,068			$ 83,890
Buildings and improvements	244,903		244,903			258,926
Acquisition-related intangible assets (in Acquired lease intangibles, net)	22,660		22,660			0
Acquisition-related intangible liabilities (in Acquired lease intangibles, net)	(12,094)		(12,094)			0
Below market debt assumed (in Mortgage and other notes payable)	11,606		11,606			10,885
Total consideration	$ 331,931		331,931			$ 331,931
Adjustments
Land			4,178
Buildings and improvements			(14,023)
Acquisition-related intangible assets (in Acquired lease intangibles, net)			22,660
Acquisition-related intangible liabilities (in Acquired lease intangibles, net)			(12,094)
Below market debt assumed (in Mortgage and other notes payable)			(721)
Total consideration			$ 0
Core Portfolio
Business Acquisition [Line Items]
Gross leasable area (in square feet) \| ft²	820,601		820,601
Percentage of interests acquired					20.00%
Purchase Price			$ 487,225
Assumption of Debt			89,682
Acquisition costs			$ 5,100
Fund IV
Business Acquisition [Line Items]
Gross leasable area (in square feet) \| ft²	222,534		222,534
Purchase Price			$ 50,350
Assumption of Debt			1,463
Acquisition costs			$ 400
Gotham Plaza \| New York, NY \| Core Portfolio
Business Acquisition [Line Items]
Gross leasable area (in square feet) \| ft²	122,902		122,902
Percentage of interests acquired	49.00%		49.00%
Purchase Price			$ 39,808
Assumption of Debt			$ 10,472
991 Madison Avenue \| New York, NY \| Core Portfolio
Business Acquisition [Line Items]
Gross leasable area (in square feet) \| ft²	6,920		6,920
Percentage of interests acquired	100.00%		100.00%
Purchase Price			$ 76,628
Assumption of Debt			$ 0
165 Newbury Street \| Boston, MA \| Core Portfolio
Business Acquisition [Line Items]
Gross leasable area (in square feet) \| ft²	1,588		1,588
Percentage of interests acquired	100.00%		100.00%
Purchase Price			$ 6,250
Assumption of Debt			$ 0
Renaissance Portfolio \| Washington D.C. \| Core Portfolio
Business Acquisition [Line Items]
Gross leasable area (in square feet) \| ft²	305,000		305,000
Percentage of interests acquired	20.00%		20.00%
Purchase Price			$ 67,600
Assumption of Debt			$ 20,000
Concord and Milwaukee \| Chicago, IL \| Core Portfolio
Business Acquisition [Line Items]
Gross leasable area (in square feet) \| ft²	13,105		13,105
Percentage of interests acquired	100.00%		100.00%
Purchase Price			$ 6,000
Assumption of Debt			$ 2,902
State and Washington \| Chicago, IL \| Core Portfolio
Business Acquisition [Line Items]
Gross leasable area (in square feet) \| ft²	84,604		84,604
Percentage of interests acquired	100.00%		100.00%
Purchase Price			$ 70,250
Assumption of Debt			$ 25,651
151 North State Street \| Chicago, IL \| Core Portfolio
Business Acquisition [Line Items]
Gross leasable area (in square feet) \| ft²	27,385		27,385
Percentage of interests acquired	100.00%		100.00%
Purchase Price			$ 30,500
Assumption of Debt			$ 14,556
North & Kingsbury \| Chicago, IL \| Core Portfolio
Business Acquisition [Line Items]
Gross leasable area (in square feet) \| ft²	41,700		41,700
Percentage of interests acquired	100.00%		100.00%
Purchase Price			$ 34,000
Assumption of Debt			$ 13,409
Sullivan Center \| Chicago, IL \| Core Portfolio
Business Acquisition [Line Items]
Gross leasable area (in square feet) \| ft²	199,122		199,122
Percentage of interests acquired	100.00%		100.00%
Purchase Price			$ 146,939
Assumption of Debt			$ 0
California and Armitage \| Chicago, IL \| Core Portfolio
Business Acquisition [Line Items]
Gross leasable area (in square feet) \| ft²	18,275		18,275
Percentage of interests acquired	100.00%		100.00%
Purchase Price			$ 9,250
Assumption of Debt			$ 2,692
1964 Union Street \| San Francisco, CA \| Fund IV
Business Acquisition [Line Items]
Gross leasable area (in square feet) \| ft²	3,817		3,817
Percentage of interests acquired	90.00%		90.00%
Purchase Price			$ 2,250
Assumption of Debt			$ 1,463
Restaurants at Fort Point \| Boston, MA \| Fund IV
Business Acquisition [Line Items]
Gross leasable area (in square feet) \| ft²	15,711		15,711
Percentage of interests acquired	100.00%		100.00%
Purchase Price			$ 11,500
Assumption of Debt			$ 0
Wake Forest Crossing \| Wake Forest, NC \| Fund IV
Business Acquisition [Line Items]
Gross leasable area (in square feet) \| ft²	203,006		203,006
Percentage of interests acquired	100.00%		100.00%
Purchase Price			$ 36,600
Assumption of Debt			$ 0
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Gross leasable area (in square feet) \| ft²	1,043,135		1,043,135
Purchase Price			$ 537,575
Assumption of Debt			91,145
Purchase Price Allocations
Land	$ 58,740		58,740
Buildings and improvements	291,820		291,820
Prepaid expenses and other assets	4,320		4,320
Acquisition-related intangible assets (in Acquired lease intangibles, net)	40,554		40,554
Acquisition-related intangible liabilities (in Acquired lease intangibles, net)	(43,753)		(43,753)
Debt assumed (included in Mortgage and other notes payable)	(59,601)		(59,601)
Total consideration	$ 292,080		292,080
Series of Individually Immaterial Business Acquisitions \| Restatement Adjustment
Business Acquisition [Line Items]
Increase to depreciation and amortization expense			1,900
Reduction to rental income			$ 100
Operating Partnership, as General Partner or Managing Member
Business Acquisition [Line Items]
Limited partners' capital account, units issued (in shares) \| shares	442,478		442,478
Series C Preferred Stock \| Operating Partnership, as General Partner or Managing Member
Business Acquisition [Line Items]
Limited partners' capital account, units issued (in shares) \| shares	141,593		141,593
Capital Lease Obligations \| 991 Madison Avenue
Business Acquisition [Line Items]
Lease term	49 years
Capital lease payments	$ 7,800