Annual report pursuant to Section 13 and 15(d)

Recent Transactions (Schedule Of Properties Acquired) (Details)

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Recent Transactions (Schedule Of Properties Acquired) (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
ft²
item
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]      
Number of Buildings, Acquired | item 3    
Acquisition cost $ 736,919,000    
Mortgage loan   $ 45,242,000 $ 45,734,000
99 Wood Avenue [Member]      
Business Acquisition [Line Items]      
Number of Buildings, Acquired | item 1    
Rentable Square Feet, Acquired | ft² 271,988    
Acquisition cost $ 61,858,000    
Soho Lofts Apartments [Member]      
Business Acquisition [Line Items]      
Number of Buildings, Acquired | item 1    
Rentable Square Feet, Acquired | ft² 377    
Acquisition cost $ 264,578,000    
Liberty Towers [Member]      
Business Acquisition [Line Items]      
Number of Buildings, Acquired | item 1    
Rentable Square Feet, Acquired | ft² 648    
Acquisition cost $ 410,483,000    
Unsecured Revolving Credit Facility [Member] | Liberty Towers [Member]      
Business Acquisition [Line Items]      
Mortgage loan $ 232,000,000