Quarterly report pursuant to Section 13 or 15(d)

Organization And Basis Of Presentation (Narrative) (Details)

v3.19.3
Organization And Basis Of Presentation (Narrative) (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2019
USD ($)
ft²
property
item
state
Dec. 31, 2018
USD ($)
Real Estate Properties [Line Items]    
Percentage of ownership interest 90.10% 89.80%
Number of properties owned or investment interests 76  
Number of units | item 208  
Number of states where properties are located | state 4  
Consolidated joint ventures, total real estate assets | $ $ 518.0 $ 480.4
Consolidated joint ventures, mortgages | $ 283.3 241.5
Consolidated joint ventures, other liabilities | $ $ 16.0 $ 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 24  
Number of units | item 7,904  
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 11,600,000  
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 115,000  
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