Annual report pursuant to Section 13 and 15(d)

Recent Transactions (Schedule Of Properties Which Commenced Initial Operations) (Details)

v3.19.3.a.u2
Recent Transactions (Schedule Of Properties Which Commenced Initial Operations) (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
item
Real Estate Properties [Line Items]    
Number of Apartment Units | item 208 1,317
Total Development Costs Incurred | $ $ 105,477,000 $ 457,984,000
Unconsolidated Joint Venture Multi-Family Properties [Member]    
Real Estate Properties [Line Items]    
Number of Apartment Units | item 2,611  
Unconsolidated Joint Venture Hotel [Member]    
Real Estate Properties [Line Items]    
Number of Apartment Units | item 351  
145 Front At City Square [Member]    
Real Estate Properties [Line Items]    
Number of Apartment Units | item   365
Total Development Costs Incurred | $   $ 97,483,000
Signature Place At Morris Plains [Member]    
Real Estate Properties [Line Items]    
Number of Apartment Units | item   197
Total Development Costs Incurred | $   $ 56,715,000
Portside 5/6 [Member]    
Real Estate Properties [Line Items]    
Number of Apartment Units | item   296
Total Development Costs Incurred | $   $ 114,694,000
Riverhouse 11 At Port Imperial [Member]    
Real Estate Properties [Line Items]    
Number of Apartment Units | item   295
Total Development Costs Incurred | $   $ 130,369,000
Residence Inn By Marriott (Phase I) [Member]    
Real Estate Properties [Line Items]    
Number of Apartment Units | item   164
Total Development Costs Incurred | $   $ 58,723,000
Autograph Collection By Marriott (Phase II) [Member]    
Real Estate Properties [Line Items]    
Number of Apartment Units | item 208  
Total Development Costs Incurred | $ $ 105,477,000  
Land [Member] | 145 Front At City Square [Member]    
Real Estate Properties [Line Items]    
Total Development Costs Incurred | $   4,400,000
Land [Member] | Signature Place At Morris Plains [Member]    
Real Estate Properties [Line Items]    
Total Development Costs Incurred | $   $ 900,000