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Properties, net | 9 Months Ended
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Sep. 30, 2013
Real Estate [Abstract] |
Properties, net | Properties, net Operating properties, net consisted of the following (in thousands):
| September 30, 2013 |  | December 31, 2012
Land | $ | 436,565 |  |  | $ | 427,766 |
Buildings and improvements | 2,889,383 |  |  | 2,725,875 |
Less: accumulated depreciation | (612,369 | ) |  | (555,975 | )
Operating properties, net | $ | 2,713,579 |  |  | $ | 2,597,666 |
Projects we had in development or held for future development consisted of the following (in thousands):
| September 30, 2013 |  | December 31, 2012
Land | $ | 253,810 |  |  | $ | 236,324 |
Construction in progress, excluding land | 272,357 |  |  | 329,054 |
Projects in development or held for future development | $ | 526,167 |  |  | $ | 565,378 |
During the nine months ended September 30, 2013, we sold 920 Elkridge Landing Road, a 103,000 square foot office property in Linthicum, Maryland (in the Baltimore/Washington Corridor), for $6.9 million. 2013 Construction Activities During the nine months ended September 30, 2013, we placed into service an aggregate of 392,000 square feet in four newly constructed office properties located in the Baltimore/Washington Corridor, Northern Virginia and Huntsville, Alabama. As of September 30, 2013, we had nine office properties under construction, or for which we were contractually committed to construct, that we estimate will total 1.3 million square feet upon completion, including four in Northern Virginia, three in Huntsville, Alabama and two in the Baltimore/Washington Corridor. We also had redevelopment underway, or otherwise approved, for two office properties that we estimate will total 235,000 square feet upon completion, including one in Greater Philadelphia and one in the Baltimore/Washington Corridor.

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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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