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Properties, net (Tables) | 12 Months Ended
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Dec. 31, 2014
Real Estate [Abstract] |
Schedule of operating properties, net | Operating properties, net consisted of the following (in thousands):
| December 31,
| 2014 |  | 2013
Land | $ | 439,355 |  |  | $ | 430,472 |
Buildings and improvements | 3,015,216 |  |  | 2,869,870 |
Less: accumulated depreciation | (703,083 | ) |  | (597,649 | )
Operating properties, net | $ | 2,751,488 |  |  | $ | 2,702,693 |
Schedule of projects in development or held for future development | Projects we had in development or held for future development consisted of the following (in thousands):
| December 31,
| 2014 |  | 2013
Land | $ | 214,977 |  |  | $ | 245,676 |
Construction in progress, excluding land | 330,449 |  |  | 265,932 |
Projects in development or held for future development | $ | 545,426 |  |  | $ | 511,608 |
Schedule of operating property dispositions | In 2014, we completed dispositions of the following operating properties (dollars in thousands):
Project Name |  | Location |  | Date of Sale |  | Number of Buildings |  | Total Rentable Square Feet |  | Transaction Value |  | Gain on Disposition
4969 and 4979 Mercantile Road |  | White Marsh, MD |  | 7/14/2014 |  | 2 |  |  | 96,721 |  |  | $ | 5,960 |  |  | $ | 2,124 |
9930 and 9940 Franklin Square |  | White Marsh, MD |  | 7/30/2014 |  | 2 |  |  | 71,992 |  |  | 10,475 |  |  | 2,303 |
5020, 5022, 5024 and 5026 Campbell Boulevard |  | White Marsh, MD |  | 8/4/2014 |  | 4 |  |  | 134,245 |  |  | 12,400 |  |  | 666 |
|  |  |  |  |  | 8 |  |  | 302,958 |  |  | $ | 28,835 |  |  | $ | 5,093 |
We completed dispositions of the following properties in 2013 primarily in connection with the Strategic Reallocation Plan (dollars in thousands):
Project Name |  | Location |  | Date of Sale |  | Number of Buildings |  | Total Rentable Square Feet |  | Transaction Value |  | Gain on Disposition
920 Elkridge Landing Road |  | Linthicum, MD |  | 6/25/2013 |  | 1 |  |  | 103,000 |  |  | $ | 6,900 |  |  | $ | — |
4230 Forbes Boulevard |  | Lanham, MD |  | 12/11/2013 |  | 1 |  |  | 56,000 |  |  | 5,600 |  |  | 1,507 |
December 2013 Colorado Springs Portfolio Disposition |  | Colorado Springs, CO |  | 12/12/2013 |  | 15 |  |  | 1,165,000 |  |  | 133,925 |  |  | 1,164 |
December 2013 Portfolio Conveyance |  | Colorado Springs, CO and Linthicum, MD |  | 12/23/2013 |  | 14 |  |  | 1,021,000 |  |  | 146,876 |  |  | — |
|  |  |  |  |  | 31 |  |  | 2,345,000 |  |  | $ | 293,301 |  |  | $ | 2,671 |

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