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Properties, net (Details 3) (USD $) | 12 Months Ended | 0 Months Ended |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Non-operating Properties | Dec. 31, 2012 Non-operating Properties | Dec. 23, 2013 Secured Debt December 2013 Portfolio Conveyance | Jul. 02, 2012 Secured Debt 400 Professional Drive | Dec. 23, 2013 Secured Debt Fair value measurement on a nonrecurring basis December 2013 Portfolio Conveyance | Jul. 02, 2012 Secured Debt Fair value measurement on a nonrecurring basis 400 Professional Drive | Dec. 31, 2013 Operating properties buillding sqft | Dec. 31, 2012 Operating properties buillding sqft | Dec. 31, 2013 Operating properties 920 Elkridge Landing Road buillding sqft | Dec. 31, 2013 Operating properties 4230 Forbes Boulevard buillding sqft | Dec. 31, 2013 Operating properties December 2013 Colorado Springs Portfolio Disposition buillding sqft | Dec. 31, 2013 Operating properties December 2013 Portfolio Conveyance buillding sqft | Dec. 31, 2012 Operating properties White Marsh Portfolio buillding sqft | Dec. 31, 2012 Operating properties 1101 Sentry Gateway buillding sqft | Dec. 31, 2012 Operating properties 222 and 224 Schilling Circle buillding sqft | Dec. 31, 2012 Operating properties 15 and 45 West Gude Drive buillding sqft | Dec. 31, 2012 Operating properties 11800 Tech Road buillding sqft | Dec. 31, 2012 Operating properties 400 Professional Drive buillding sqft | Dec. 31, 2012 Operating properties July 2012 Portfolio Disposition buillding sqft
Dispositions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Buildings Disposed |  |  |  |  |  |  |  |  |  | 31 | 35 | 1 | 1 | 15 | 14 | 5 | 1 | 2 | 2 | 1 | 1 | 23
Total Rentable Square Feet |  |  |  |  |  |  |  |  |  | 2,345,000 | 2,302,000 | 103,000 | 56,000 | 1,165,000 | 1,021,000 | 163,000 | 95,000 | 56,000 | 231,000 | 240,000 | 130,000 | 1,387,000
Transaction Value of Operating Property Dispositions |  |  |  |  |  |  |  |  |  | $ 293,301,000 | $ 285,506,000 | $ 6,900,000 | $ 5,600,000 | $ 133,925,000 | $ 146,876,000 | $ 19,100,000 | $ 13,500,000 | $ 4,400,000 | $ 49,107,000 | $ 21,300,000 | $ 16,198,000 | $ 161,901,000
Gain on Sale |  |  |  |  |  |  |  |  |  | 2,671,000 | 21,186,000 | 0 | 1,507,000 | 1,164,000 | 0 | 2,445,000 | 1,739,000 | 102,000 | 0 | 0 | 0 | 16,900,000
Sale Price of Non-operating Properties |  |  |  | 3,500,000 | 28,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt settled through the surrender of real estate assets |  |  |  |  |  | 146,500,000 | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of real estate disposed in settlement of debt |  |  |  |  |  |  |  | 74,000,000 | 11,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on early extinguishment of debt | $ (27,030,000) | $ (943,000) | $ (1,639,000) |  |  | $ 67,800,000 | $ 3,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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