Quarterly report pursuant to Section 13 or 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)
9 Months Ended
Jul. 29, 2019
USD ($)
Jun. 28, 2019
USD ($)
Jan. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
item
Sep. 30, 2018
USD ($)
Jan. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]              
Principal balance outstanding       $ 3,151,561,000     $ 2,792,651,000
Borrowings from revolving credit facility       489,000,000 $ 428,000,000    
Payment for borrowings       $ 398,000,000 $ 381,000,000    
Secured Debt [Member]              
Debt Instrument [Line Items]              
Effective rate       3.15%      
Principal balance outstanding       $ 2,106,550,000     1,440,396,000
Unamortized deferred financing costs       13,917,000     8,998,000
Total mortgages, loans payable and other obligations, net       $ 2,092,633,000     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] | Worcester [Member]              
Debt Instrument [Line Items]              
Property Name       Worcester (c)      
Lender       Citizens Bank      
Effective rate       2.50%      
Principal balance outstanding       $ 57,883,000     56,892,000
Loan maturity date       Dec. 10, 2019      
Secured Debt [Member] | Worcester [Member] | Construction Loan [Member]              
Debt Instrument [Line Items]              
Maximum borrowing capacity       $ 58,000,000      
Number of extension options | item       2      
Loan extension period       1 year      
Extension fee       0.15%      
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       $ 167,157,000     168,370,000
Loan maturity date       Feb. 01, 2021      
Secured Debt [Member] | Monaco [Member] | Construction Loan [Member]              
Debt Instrument [Line Items]              
Maximum borrowing capacity       $ 2,100,000      
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       $ 3,951,000     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 & Santander      
Effective rate       4.50%      
Principal balance outstanding       $ 56,636,000     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       $ 13,837,000      
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       $ 4,238,000      
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] | Alterra I & II [Member]              
Debt Instrument [Line Items]              
Property Name       Alterra I & II (h)      
Lender       Capital One/FreddieMac      
Effective rate       3.85%      
Principal balance outstanding       $ 100,000,000     100,000,000
Loan maturity date       Feb. 01, 2024      
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      
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 Chase At Overlook Ridge [Member]              
Debt Instrument [Line Items]              
Property Name       The Chase at Overlook Ridge (j)      
Lender       New York Community Bank      
Effective rate       3.74%      
Principal balance outstanding       $ 135,750,000     135,750,000
Loan maturity date       Jan. 01, 2025      
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 (k)      
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] | Short Hills Portfolio [Member]              
Debt Instrument [Line Items]              
Property Name       Short Hills Portfolio (l)      
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] | 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      
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 (m)      
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      
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