Annual report pursuant to Section 13 and 15(d)

Information by Business Segment (Details)

v2.4.0.6
Information by Business Segment (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
segment
Dec. 31, 2010
Dec. 31, 2009
Information by Business Segment      
Number of primary office property segments 9    
Segment financial information for real estate operations      
Revenues from real estate operations $ 495,832 $ 461,728 $ 426,855
Property operating expenses 196,016 179,763 157,406
NOI from real estate operations 299,816 281,965 269,449
Segment assets 3,867,524 3,844,517  
Operating Segment Total
     
Segment financial information for real estate operations      
Revenues from real estate operations 495,832 461,728 426,855
Property operating expenses 196,016 179,763 157,406
NOI from real estate operations 299,816 281,965 269,449
Additions to properties, net 330,966 525,410 331,001
Segment assets 3,867,524 3,844,517 3,380,022
Baltimore/Washington Corridor
     
Segment financial information for real estate operations      
Revenues from real estate operations 218,051 207,456 197,610
Property operating expenses 81,859 77,340 72,902
NOI from real estate operations 136,192 130,116 124,708
Additions to properties, net 79,580 90,054 98,437
Segment assets 1,401,082 1,392,524 1,332,579
Northern Virginia
     
Segment financial information for real estate operations      
Revenues from real estate operations 74,214 75,063 79,132
Property operating expenses 29,644 28,115 30,111
NOI from real estate operations 44,570 46,948 49,021
Additions to properties, net 54,565 108,438 7,673
Segment assets 583,695 545,560 451,965
San Antonio
     
Segment financial information for real estate operations      
Revenues from real estate operations 30,066 21,673 13,566
Property operating expenses 14,864 10,447 4,479
NOI from real estate operations 15,202 11,226 9,087
Additions to properties, net 6,040 19,064 38,353
Segment assets 161,419 154,787 134,986
Washington, DC - Capitol Riverfront
     
Segment financial information for real estate operations      
Revenues from real estate operations 17,878 4,678  
Property operating expenses 6,888 1,758  
NOI from real estate operations 10,990 2,920  
Additions to properties, net 2,156 92,811  
Segment assets 108,366 120,492  
St. Mary's and King George Counties
     
Segment financial information for real estate operations      
Revenues from real estate operations 14,366 13,967 13,960
Property operating expenses 4,320 4,340 3,491
NOI from real estate operations 10,046 9,627 10,469
Additions to properties, net 12,293 7,090 2,200
Segment assets 105,599 99,412 94,732
Greater Baltimore
     
Segment financial information for real estate operations      
Revenues from real estate operations 70,668 71,850 58,275
Property operating expenses 30,597 31,491 25,560
NOI from real estate operations 40,071 40,359 32,715
Additions to properties, net 28,703 38,586 124,637
Segment assets 506,415 585,001 569,590
Suburban Maryland
     
Segment financial information for real estate operations      
Revenues from real estate operations 21,982 21,759 19,620
Property operating expenses 9,517 9,657 8,393
NOI from real estate operations 12,465 12,102 11,227
Additions to properties, net 12,365 4,434 24,022
Segment assets 173,749 176,776 179,453
Colorado Springs
     
Segment financial information for real estate operations      
Revenues from real estate operations 23,860 24,897 23,125
Property operating expenses 9,822 9,137 7,391
NOI from real estate operations 14,038 15,760 15,734
Additions to properties, net 4,108 3,499 22,593
Segment assets 208,316 265,119 270,358
Greater Philadelphia
     
Segment financial information for real estate operations      
Revenues from real estate operations 7,458 6,299 7,983
Property operating expenses 1,814 2,274 1,271
NOI from real estate operations 5,644 4,025 6,712
Additions to properties, net 17,250 20,714 9,126
Segment assets 138,623 122,734 105,372
Wholesale Data Center
     
Segment financial information for real estate operations      
Revenues from real estate operations 5,054 1,062  
Property operating expenses 3,489 1,202  
NOI from real estate operations 1,565 (140)  
Additions to properties, net 67,909 125,636  
Segment assets 196,881 129,815  
Other
     
Segment financial information for real estate operations      
Revenues from real estate operations 12,235 13,024 13,584
Property operating expenses 3,202 4,002 3,808
NOI from real estate operations 9,033 9,022 9,776
Additions to properties, net 45,997 15,084 3,960
Segment assets $ 283,379 $ 252,297 $ 240,987