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Properties, net | 3 Months Ended
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Mar. 31, 2014
Real Estate [Abstract] |
Properties, net | Properties, net Operating properties, net consisted of the following (in thousands):
| March 31, 2014 |  | December 31, 2013
Land | $ | 436,381 |  |  | $ | 430,472 |
Buildings and improvements | 2,927,800 |  |  | 2,869,870 |
Less: accumulated depreciation | (635,178 | ) |  | (597,649 | )
Operating properties, net | $ | 2,729,003 |  |  | $ | 2,702,693 |
During the three months ended March 31, 2014, we recognized $12.9 million in additional depreciation expense resulting from our revision of the useful life of a property in Greater Philadelphia that was removed from service for redevelopment. Projects we had in development or held for future development consisted of the following (in thousands):
| March 31, 2014 |  | December 31, 2013
Land | $ | 238,904 |  |  | $ | 245,676 |
Construction in progress, excluding land | 256,721 |  |  | 265,932 |
Projects in development or held for future development | $ | 495,625 |  |  | $ | 511,608 |
2014 Construction Activities During the three months ended March 31, 2014, we placed into service an aggregate of 355,000 square feet in two newly constructed office properties located in Northern Virginia and Huntsville, Alabama. As of March 31, 2014, we had eight office properties under construction, or for which we were contractually committed to construct, that we estimate will total 1.2 million square feet upon completion, including four in the Baltimore/Washington Corridor, three in Northern Virginia and one in San Antonio. We also had four office properties under redevelopment that we estimate will total 403,000 square feet upon completion, including two in Greater Philadelphia, one in the Baltimore/Washington Corridor and one in St. Mary’s County, Maryland.

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- Definition The entire disclosure for certain real estate investment financial statements, real estate investment trust operating support agreements, real estate owned, retail land sales, time share transactions, as well as other real estate related disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Subparagraph 4 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 11 -Article 9 + Details
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