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Real Estate Investments Dispositions (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) a ft² property parcel | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) a ft² property parcel | Sep. 30, 2014 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gain/(Loss) On Sale |  | $ 6,083 | $ 4,698 | $ 16,673 | $ 4,698
Provision for impairment on assets held for sale |  | 0 | $ 1,765 | 2,508 | 1,765
Gain (loss) on sale of properties |  |  |  | (19,692) | $ (5,882)
Sold Property |  | 206,400 |  | 206,400 |
Disposition Target |  |  |  | 400,000 |
Land [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Sale Price |  | $ 15,800 |  | 15,800 |
Gain/(Loss) On Sale |  |  |  | $ 3,019 |
Number of Parcels | parcel |  | 3 |  | 3 |
Area Owned by Company of Undeveloped Parcels Of Land | a |  | 13.1 |  | 13.1 |
Land [Member] | 7000 Midlantic [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Sale Price |  | $ 2,200 |  | $ 2,200 |
Gain/(Loss) On Sale |  |  |  | $ (169) |
Number of Parcels | parcel |  | 1 |  | 1 |
Area Owned by Company of Undeveloped Parcels Of Land | a |  | 3.5 |  | 3.5 |
Land [Member] | Four Points Centre [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Sale Price |  | $ 2,500 |  | $ 2,500 |
Gain/(Loss) On Sale |  |  |  | $ 71 |
Number of Parcels | parcel |  | 1 |  | 1 |
Area Owned by Company of Undeveloped Parcels Of Land | a |  | 8.6 |  | 8.6 |
Land [Member] | Two Kaiser Plaza [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Sale Price |  | $ 11,100 |  | $ 11,100 |
Gain/(Loss) On Sale |  |  |  | $ 3,117 |
Number of Parcels | parcel |  | 1 |  | 1 |
Area Owned by Company of Undeveloped Parcels Of Land | a |  | 1.0 |  | 1.0 |
Office Building [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of Properties | property | [1] | 15 |  | 15 |
Rentable Square Feet | ft² | [1] | 1,415,704 |  | 1,415,704 |
Sale Price | [1] | $ 206,425 |  | $ 206,425 |
Gain/(Loss) On Sale | [1],[2] |  |  | 16,320 |
Deferred gain |  | $ 500 |  | 500 |
Gain (loss) on sale of properties |  |  |  | $ 100 |
Office Building [Member] | 1000 Howard Boulevard [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of Properties | property |  | 1 |  | 1 |
Rentable Square Feet | ft² |  | 105,312 |  | 105,312 |
Sale Price |  | $ 16,500 |  | $ 16,500 |
Gain/(Loss) On Sale | [2] |  |  | $ 4,823 |
Office Building [Member] | Bay Colony [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of Properties | property |  | 4 |  | 4 |
Rentable Square Feet | ft² |  | 247,294 |  | 247,294 |
Sale Price |  | $ 37,500 |  | $ 37,500 |
Gain/(Loss) On Sale | [2] |  |  | $ 288 |
Office Building [Member] | 741 First Avenue [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of Properties | property |  | 1 |  | 1 |
Rentable Square Feet | ft² |  | 77,184 |  | 77,184 |
Sale Price |  | $ 4,900 |  | $ 4,900 |
Gain/(Loss) On Sale | [2] |  |  | $ 372 |
Office Building [Member] | 100 Gateway Centre Parkway [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of Properties | property | [3] | 1 |  | 1 |
Rentable Square Feet | ft² | [3] | 74,991 |  | 74,991 |
Sale Price | [3] | $ 4,100 |  | $ 4,100 |
Gain/(Loss) On Sale | [2],[3] |  |  | 0 |
Provision for impairment on assets held for sale |  |  |  | $ 800 |
Office Building [Member] | Christina / Delaware Corporate Centers [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of Properties | property |  | 5 |  | 5 |
Rentable Square Feet | ft² |  | 485,182 |  | 485,182 |
Sale Price |  | $ 50,125 |  | $ 50,125 |
Gain/(Loss) On Sale | [2] |  |  | $ 1,797 |
Office Building [Member] | Lake Merritt Tower [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of Properties | property | [4] | 1 |  | 1 |
Rentable Square Feet | ft² | [4] | 204,336 |  | 204,336 |
Sale Price | [4] | $ 65,000 |  | $ 65,000 |
Gain/(Loss) On Sale | [2],[4] |  |  | 0 |
Provision for impairment on assets held for sale |  |  |  | $ 1,700 |
Office Building [Member] | Atrium I / Libertyview [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of Properties | property |  | 2 |  | 2 |
Rentable Square Feet | ft² |  | 221,405 |  | 221,405 |
Sale Price |  | $ 28,300 |  | $ 28,300 |
Gain/(Loss) On Sale | [2] |  |  | $ 9,040 |
Assets Held-for-sale [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of Properties | property |  | 6 |  | 6 |
Rentable Square Feet | ft² |  | 560,147 |  | 560,147 |
Contractual Sales Price |  | $ 56,500 |  | $ 56,500 |
[1] | Total gain/(loss) on sale does not include a deferred gain of $0.5 million related to a prior sale and $0.1 million in losses associated with prior sales.
[2] | Gain/(Loss) on Sale is net of closing and other transaction related costs.
[3] | 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.
[4] | 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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