Annual report pursuant to Section 13 and 15(d)

Mortgages, Loans Payable And Other Obligations (Summary Of Mortgages, Loans Payable And Other Obligations) (Details)

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Mortgages, Loans Payable And Other Obligations (Summary Of Mortgages, Loans Payable And Other Obligations) (Details)
12 Months Ended
Jul. 29, 2019
USD ($)
Jun. 28, 2019
USD ($)
Jan. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 31, 2020
USD ($)
Jan. 30, 2019
USD ($)
Debt Instrument [Line Items]                
Principal balance outstanding       $ 2,808,517,000 $ 2,792,651,000      
Loss from early extinguishment of debt         1,821,000      
Adjustment for unamortized debt discount       2,170,000        
Borrowings from revolving credit facility       829,000,000 461,000,000 $ 730,000,000    
Payment for borrowings       617,000,000 494,000,000 866,000,000    
Mortgage loan         45,242,000 $ 45,734,000    
Secured Debt [Member]                
Debt Instrument [Line Items]                
Principal balance outstanding       1,925,038,000 1,440,396,000      
Unamortized deferred financing costs       (17,004,000) (8,998,000)      
Total mortgages, loans payable and other obligations, net       $ 1,908,034,000 1,431,398,000      
Secured Debt [Member] | Park Square Apartments [Member]                
Debt Instrument [Line Items]                
Property Name       Park Square (b)        
Lender       Wells Fargo Bank N.A.        
Effective rate       1.87%        
Principal balance outstanding         25,167,000      
Secured Debt [Member] | Alterra I & II [Member]                
Debt Instrument [Line Items]                
Property Name       Alterra I & II (c)        
Lender       Capital One/FreddieMac        
Effective rate       3.85%        
Principal balance outstanding         100,000,000      
Secured Debt [Member] | The Chase At Overlook Ridge [Member]                
Debt Instrument [Line Items]                
Property Name       The Chase at Overlook Ridge (c)        
Lender       New York Community Bank        
Effective rate       3.74%        
Principal balance outstanding         135,750,000      
Secured Debt [Member] | Monaco [Member]                
Debt Instrument [Line Items]                
Property Name       Monaco (d)        
Lender       The Northwestern Mutual Life Insurance Co.        
Effective rate       3.15%        
Principal balance outstanding       $ 166,752,000 168,370,000      
Loan maturity date       Feb. 01, 2021        
Secured Debt [Member] | Monaco [Member] | Construction Loan [Member]                
Debt Instrument [Line Items]                
Maximum borrowing capacity       $ 1,800,000        
Secured Debt [Member] | Port Imperial South 4/5 Retail [Member]                
Debt Instrument [Line Items]                
Property Name       Port Imperial South 4/5 Retail        
Lender       American General Life & A/G PC        
Effective rate       4.56%        
Principal balance outstanding       $ 3,934,000 4,000,000      
Loan maturity date       Dec. 01, 2021        
Secured Debt [Member] | Port Imperial 4/5 Hotel [Member]                
Debt Instrument [Line Items]                
Property Name       Port Imperial 4/5 Hotel (e)        
Lender       Fifth Third Bank        
Effective rate       3.40%        
Principal balance outstanding       $ 74,000,000 73,350,000      
Loan maturity date       Apr. 09, 2022        
Secured Debt [Member] | Port Imperial 4/5 Hotel [Member] | Construction Loan [Member]                
Debt Instrument [Line Items]                
Maximum borrowing capacity       $ 94,000,000        
Number of extension options | item       2        
Loan extension period       1 year        
Extension fee       0.20%        
Payment for borrowings   $ 30,000,000            
Secured Debt [Member] | Chase III Project [Member]                
Debt Instrument [Line Items]                
Property Name       Chase III (f)        
Lender       Fifth Third Bank        
Effective rate       2.50%        
Principal balance outstanding       $ 24,064,000        
Loan maturity date       May 16, 2022        
Secured Debt [Member] | Chase III Project [Member] | Construction Loan [Member]                
Debt Instrument [Line Items]                
Maximum borrowing capacity       $ 62,000,000        
Number of extension options | item       1        
Loan extension period       18 months        
Extension fee       0.25%        
Secured Debt [Member] | Port Imperial South 9 [Member]                
Debt Instrument [Line Items]                
Property Name       Port Imperial South 9 (g)        
Lender       Bank of New York Mellon        
Effective rate       2.13%        
Principal balance outstanding       $ 11,615,000        
Loan maturity date       Dec. 19, 2022        
Secured Debt [Member] | Port Imperial South 9 [Member] | Construction Loan [Member]                
Debt Instrument [Line Items]                
Maximum borrowing capacity       $ 92,000,000        
Number of extension options | item       1        
Loan extension period       1 year        
Extension fee       0.15%        
Secured Debt [Member] | Portside 7 [Member]                
Debt Instrument [Line Items]                
Property Name       Portside 7        
Lender       CBRE Capital Markets/FreddieMac        
Effective rate       3.57%        
Principal balance outstanding       $ 58,998,000 58,998,000      
Loan maturity date       Aug. 01, 2023        
Secured Debt [Member] | Short Hills Residential [Member]                
Debt Instrument [Line Items]                
Property Name       Short Hills Residential (h)        
Lender       People's United Bank        
Effective rate       2.15%        
Principal balance outstanding       $ 9,431,000        
Loan maturity date       Mar. 26, 2023        
Secured Debt [Member] | 250 Johnson Road [Member]                
Debt Instrument [Line Items]                
Property Name       250 Johnson (i)        
Lender       Nationwide Life Insurance Company        
Effective rate       3.74%        
Principal balance outstanding       $ 43,000,000 41,769,000      
Loan maturity date       Aug. 01, 2024        
Secured Debt [Member] | 250 Johnson Road [Member] | Construction Loan [Member]                
Debt Instrument [Line Items]                
Loan maturity date       Aug. 01, 2024        
Payment for borrowings $ 43,000,000              
Secured Debt [Member] | Liberty Towers [Member]                
Debt Instrument [Line Items]                
Property Name       Liberty Towers (j)        
Lender       American General Life Insurance Company        
Effective rate       3.37%        
Principal balance outstanding       $ 232,000,000        
Loan maturity date       Oct. 01, 2024        
Secured Debt [Member] | The Charlotte [Member]                
Debt Instrument [Line Items]                
Property Name       The Charlotte (k)        
Lender       QuadReal Finance        
Effective rate       2.70%        
Principal balance outstanding       $ 5,144,000        
Loan maturity date       Dec. 01, 2024        
Secured Debt [Member] | The Charlotte [Member] | Construction Loan [Member]                
Debt Instrument [Line Items]                
Spread over LIBOR       2.00%        
Maximum borrowing capacity       $ 300,000,000        
Number of extension options | item       1        
Loan extension period       1 year        
Extension fee       0.25%        
Secured Debt [Member] | Portside 5/6 [Member]                
Debt Instrument [Line Items]                
Property Name       Portside 5/6        
Lender       New York Life Insurance Company        
Effective rate       4.56%        
Principal balance outstanding       $ 97,000,000 97,000,000      
Loan maturity date       Mar. 10, 2026        
Secured Debt [Member] | Marbella I [Member]                
Debt Instrument [Line Items]                
Property Name       Marbella        
Lender       New York Life Insurance Company        
Effective rate       4.17%        
Principal balance outstanding       $ 131,000,000 131,000,000      
Loan maturity date       Aug. 10, 2026        
Secured Debt [Member] | Marbella II [Member]                
Debt Instrument [Line Items]                
Property Name       Marbella II (l)        
Lender       New York Life Insurance Company        
Effective rate       4.29%        
Principal balance outstanding       $ 117,000,000        
Loan maturity date       Aug. 10, 2026        
Secured Debt [Member] | 101 Hudson [Member]                
Debt Instrument [Line Items]                
Property Name       101 Hudson        
Lender       Wells Fargo CMBS        
Effective rate       3.20%        
Principal balance outstanding       $ 250,000,000 250,000,000      
Loan maturity date       Oct. 11, 2026        
Secured Debt [Member] | Worcester [Member]                
Debt Instrument [Line Items]                
Property Name       Worcester        
Lender       MUFG Union Bank        
Effective rate       1.84%        
Principal balance outstanding       $ 63,000,000 56,892,000      
Loan maturity date       Dec. 10, 2026        
Secured Debt [Member] | Short Hills Portfolio [Member]                
Debt Instrument [Line Items]                
Property Name       Short Hills Portfolio (m)        
Lender       Wells Fargo CMBS        
Effective rate       4.15%        
Principal balance outstanding       $ 124,500,000 124,500,000      
Loan maturity date       Apr. 01, 2027        
Secured Debt [Member] | Short Hills Portfolio [Member] | Construction Loan [Member]                
Debt Instrument [Line Items]                
Maximum borrowing capacity       $ 64,000,000        
Number of extension options | item       1        
Loan extension period       18 months        
Extension fee       0.30%        
Secured Debt [Member] | 150 Main St [Member]                
Debt Instrument [Line Items]                
Property Name       150 Main St.        
Lender       Natixis Real Estate Capital LLC        
Effective rate       4.48%        
Principal balance outstanding       $ 41,000,000 41,000,000      
Loan maturity date       Aug. 05, 2027        
Secured Debt [Member] | Port Imperial South 11 [Member]                
Debt Instrument [Line Items]                
Property Name       Port Imperial South 11        
Lender       The Northwestern Mutual Life Insurance Co.        
Effective rate       4.52%        
Principal balance outstanding       $ 100,000,000 100,000,000      
Loan maturity date       Jan. 10, 2029        
Secured Debt [Member] | Soho Lofts Apartments [Member]                
Debt Instrument [Line Items]                
Property Name       Soho Lofts (n)        
Lender       New York Community Bank        
Effective rate       3.77%        
Principal balance outstanding       $ 160,000,000        
Loan maturity date       Jul. 01, 2029        
Secured Debt [Member] | Riverwatch Commons [Member]                
Debt Instrument [Line Items]                
Property Name       Riverwatch Commons (n)        
Lender       New York Community Bank        
Effective rate       3.79%        
Principal balance outstanding       $ 30,000,000        
Loan maturity date       Jul. 01, 2029        
Effective percentage after five years       2.75%        
First period of term period       5 years        
Secured Debt [Member] | 111 River St. [Member]                
Debt Instrument [Line Items]                
Property Name       111 River St.        
Lender       Athene Annuity and Life Company        
Effective rate       3.90%        
Principal balance outstanding       $ 150,000,000        
Loan maturity date       Sep. 01, 2029        
Secured Debt [Member] | Port Imperial South 4/5 Garage [Member]                
Debt Instrument [Line Items]                
Property Name       Port Imperial South 4/5 Garage        
Lender       American General Life & A/G PC        
Effective rate       4.85%        
Principal balance outstanding       $ 32,600,000 $ 32,600,000      
Loan maturity date       Dec. 01, 2029        
Secured Debt [Member] | Subsequent Event [Member] | Liberty Towers [Member]                
Debt Instrument [Line Items]                
Maximum borrowing capacity             $ 265,000,000  
Additional borrowing capacity             $ 33,000,000  
Unconsolidated Joint Venture Multi-Family Properties [Member] | Marbella II [Member]                
Debt Instrument [Line Items]                
Percentage of additional interest acquired     50.00%          
Mortgage loan     $ 117,000,000         $ 74,700,000