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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
segment
Mar. 31, 2011
Dec. 31, 2011
Segment Reporting Information [Line Items]      
Reportable segments 4    
Real estate rental revenue $ 76,499 $ 69,204  
Real estate expenses 26,013 23,253  
Net operating income 50,486 45,951  
Depreciation and amortization (25,994) (21,894)  
General and administrative (3,606) (3,702)  
Interest expense (15,895) (16,893)  
Other income 244 306  
Acquisition costs (54) (1,649)  
Income from discontinued operations 0 2,569  
Net income 5,181 4,688  
Less: Net income attributable to noncontrolling interests in subsidiaries 0 (23)  
Net income attributable to the controlling interests 5,181 4,665  
Capital expenditures 10,669 3,795  
Total assets 2,116,546 2,216,212 2,120,758
Office [Member]
      
Segment Reporting Information [Line Items]      
Real estate rental revenue 38,629 33,433  
Real estate expenses 13,894 11,214  
Net operating income 24,735 22,219  
Capital expenditures 7,740 2,466  
Total assets 1,113,521 1,056,647  
Medical Office [Member]
      
Segment Reporting Information [Line Items]      
Real estate rental revenue 11,428 11,131  
Real estate expenses 3,744 3,669  
Net operating income 7,684 7,462  
Capital expenditures 1,473 669  
Total assets 346,145 351,939  
Retail [Member]
      
Segment Reporting Information [Line Items]      
Real estate rental revenue 13,446 12,147  
Real estate expenses 3,444 3,542  
Net operating income 10,002 8,605  
Capital expenditures 260 441  
Total assets 362,307 310,795  
Multifamily [Member]
      
Segment Reporting Information [Line Items]      
Real estate rental revenue 12,996 12,493  
Real estate expenses 4,931 4,828  
Net operating income 8,065 7,665  
Capital expenditures 986 125  
Total assets 246,730 225,776  
Industrial Flex [Member]
      
Segment Reporting Information [Line Items]      
Real estate rental revenue   0  
Real estate expenses   0  
Net operating income   0  
Capital expenditures   239  
Total assets   224,923  
Corporate and Other [Member]
      
Segment Reporting Information [Line Items]      
Real estate rental revenue 0 0  
Real estate expenses 0 0  
Net operating income 0 0  
Capital expenditures 210 105  
Total assets $ 47,843 $ 46,132