Quarterly report pursuant to Section 13 or 15(d)

Properties, net (Details 3)

v2.4.0.6
Properties, net (Details 3) (USD $)
 3 Months Ended
Mar. 31, 2012
Disposals and Impairment Losses  
Aggregate net impairment losses recognized in connection with disposition plan $ 6,600,000
Aggregate net impairment losses recognized in discontinued operation in connection with disposition plan 1,500,000
Exit cost included in net impairment losses recognized in connection with disposition plan 1,100,000
Net impairment losses on expected disposition of additional property 5,100,000
Non-operating properties
  
Dispositions  
Sale Price of Non-operating Properties 25,700,000
Operating properties, net
  
Dispositions  
Number of Buildings 8
Total Rentable Square Feet 314,000
Sale Price of Operating Properties 37,000,000
Gain on Sale 4,397,000
White Marsh Portfolio | Operating properties, net
  
Dispositions  
Number of Buildings 5
Total Rentable Square Feet 163,000
Sale Price of Operating Properties 19,100,000
Gain on Sale 2,445,000
Number of properties comprising White Marsh Professional Center 3
1101 Sentry Gateway | Operating properties, net
  
Dispositions  
Number of Buildings 1
Total Rentable Square Feet 95,000
Sale Price of Operating Properties 13,500,000
Gain on Sale 1,750,000
222 and 224 Schilling Circle | Operating properties, net
  
Dispositions  
Number of Buildings 2
Total Rentable Square Feet 56,000
Sale Price of Operating Properties 4,400,000
Gain on Sale $ 202,000