Quarterly report pursuant to Section 13 or 15(d)

Organization And Basis Of Presentation (Narrative) (Details)

v3.19.1
Organization And Basis Of Presentation (Narrative) (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2019
USD ($)
ft²
state
property
item
Dec. 31, 2018
USD ($)
Real Estate Properties [Line Items]    
Percentage of ownership interest 90.00% 89.80%
Number of properties owned or investment interests 74  
Number of states where properties are located | state 4  
Consolidated joint ventures, total real estate assets | $ $ 679.5 $ 480.4
Consolidated joint ventures, mortgages | $ 361.4 241.5
Consolidated joint ventures, other liabilities | $ $ 22.4 $ 23.0
Commercial Properties [Member]    
Real Estate Properties [Line Items]    
Number of tenants | item 400  
Multi-Family Properties [Member]    
Real Estate Properties [Line Items]    
Number of properties owned or investment interests 22  
Number of units | item 6,879  
Office [Member]    
Real Estate Properties [Line Items]    
Number of properties owned or investment interests 45  
Aggregate square feet of the property owned or investment interest | ft² 11,900,000  
Unconsolidated Joint Venture Office Buildings [Member]    
Real Estate Properties [Line Items]    
Number of properties owned or investment interests 2  
Aggregate square feet of the property owned or investment interest | ft² 200,000  
Unconsolidated Joint Venture Multi-Family Properties [Member]    
Real Estate Properties [Line Items]    
Number of properties owned or investment interests 7  
Number of units | item 2,611  
Unconsolidated Joint Venture Office/Flex Buildings And Hotel [Member]    
Real Estate Properties [Line Items]    
Number of properties owned or investment interests 2  
Parking/Retail [Member]    
Real Estate Properties [Line Items]    
Number of properties owned or investment interests 4  
Aggregate square feet of the property owned or investment interest | ft² 113,800  
Unconsolidated Joint Venture Parking/Retail Buildings [Member]    
Real Estate Properties [Line Items]    
Number of properties owned or investment interests 2  
Aggregate square feet of the property owned or investment interest | ft² 81,700  
Land [Member]    
Real Estate Properties [Line Items]    
Number of properties owned or investment interests 1