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Real Estate Investments Dispositions (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) ft² property | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) ft² property | Jun. 30, 2014 USD ($)
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |  |
Number of Properties | property |  | 9 |  | 9 |  |
Sale Price |  | $ 147,500 |  | $ 147,500 |  |
Gain/(Loss) On Sale |  | $ 1,571 | $ 0 | $ 10,590 | [1] | $ 0
Rentable Square Feet | ft² |  | 985,914 |  | 985,914 |  |
Provision for impairment on assets held for sale |  | $ 782 | $ 0 | $ 2,508 |  | $ 0
Sold Property |  | $ 147,500 |  | 147,500 |  |
Original Disposition Target |  |  |  | 180,000 |  |
Disposition Target |  |  |  | $ 300,000 |  |
100 Gateway Centre Parkway [Member] |  |  |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |  |
Number of Properties | property |  | 1 |  | 1 |  |
Sale Price |  | $ 4,100 |  | $ 4,100 |  |
Gain/(Loss) On Sale | [1],[2] |  |  | $ 0 |  |
Rentable Square Feet | ft² |  | 74,991 |  | 74,991 |  |
Provision for impairment on assets held for sale |  |  |  | $ 800 |  |
Delaware Corporate Center I and II and Christiana Corporate Center [Member] |  |  |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |  |
Number of Properties | property |  | 5 |  | 5 |  |
Sale Price |  | $ 50,100 |  | $ 50,100 |  |
Gain/(Loss) On Sale | [1] |  |  | $ 1,600 |  |
Rentable Square Feet | ft² |  | 485,182 |  | 485,182 |  |
Lake Merritt Tower [Member] |  |  |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |  |
Number of Properties | property |  | 1 |  | 1 |  |
Sale Price |  | $ 65,000 |  | $ 65,000 |  |
Gain/(Loss) On Sale | [1],[3] |  |  | $ 0 |  |
Rentable Square Feet | ft² |  | 204,336 |  | 204,336 |  |
Provision for impairment on assets held for sale |  |  |  | $ 1,700 |  |
1000 Atrium Way and Libertyview [Member] |  |  |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |  |
Number of Properties | property |  | 2 |  | 2 |  |
Sale Price |  | $ 28,300 |  | $ 28,300 |  |
Gain/(Loss) On Sale | [1] |  |  | $ 9,000 |  |
Rentable Square Feet | ft² |  | 221,405 |  | 221,405 |  |
[1] | Gain/(Loss) on Sale is net of closing and other transaction related costs.
[2] | The Company recorded an impairment loss of $0.8 million for 100 Gateway Centre Parkway during the second quarter of 2015. As such, there was no gain/(loss) at disposition for this property.
[3] | The Company recorded an impairment loss of $1.7 million for Lake Merritt Tower at March 31, 2015. As such, there was no gain/(loss) at disposition for this property. Sales proceeds were deposited in escrow under Section 1031 of the Internal Revenue Code and applied to purchase the Broadmoor Austin portfolio. Refer to Broadmoor Austin Associates acquisition summary, above, for further details.

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