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)
1 Months Ended 3 Months Ended
Apr. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Nov. 30, 2020
Jan. 31, 2020
USD ($)
Mar. 31, 2021
USD ($)
item
Mar. 31, 2020
USD ($)
Debt Instrument [Line Items]            
Principal balance outstanding   $ 2,801,797,000     $ 2,821,964,000  
Repayment of revolving credit facility and money market loans         $ 33,000,000 $ 121,000,000
Port Imperial 4/5 Garage Development [Member]            
Debt Instrument [Line Items]            
Loan maturity date         Dec. 01, 2029  
Subsequent Event [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]            
Debt Instrument [Line Items]            
Repayment of debt $ 124,500,000          
Subsequent Event [Member] | Short Hills Portfolio [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]            
Debt Instrument [Line Items]            
Repayment of debt $ 22,000,000          
Secured Debt [Member]            
Debt Instrument [Line Items]            
Principal balance outstanding   2,218,862,000     $ 2,262,880,000  
Unamortized deferred financing costs   (14,718,000)     (13,861,000)  
Total mortgages, loans payable and other obligations, net   2,204,144,000     $ 2,249,019,000  
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   3,866,000     $ 3,848,000  
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 (b)  
Lender         Fifth Third Bank  
Effective rate         3.40%  
Principal balance outstanding   94,000,000     $ 94,000,000  
Loan maturity date         Apr. 09, 2022  
Guaranteed amount         $ 19,500,000  
Secured Debt [Member] | Port Imperial South 9 [Member]            
Debt Instrument [Line Items]            
Property Name         Port Imperial South 9 (c)  
Lender         Bank of New York Mellon  
Effective rate         2.13%  
Principal balance outstanding   46,357,000     $ 60,253,000  
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%  
Percent of principal loan outstanding         10.00%  
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 (d)  
Lender         People's United Bank  
Effective rate         2.15%  
Principal balance outstanding   42,459,000     $ 50,395,000  
Loan maturity date         Mar. 26, 2023  
Secured Debt [Member] | Short Hills Residential [Member] | Construction Loan [Member]            
Debt Instrument [Line Items]            
Number of extension options | item         1  
Loan extension period         18 months  
Percent of principal loan outstanding         15.00%  
Secured Debt [Member] | 250 Johnson Road [Member]            
Debt Instrument [Line Items]            
Property Name         250 Johnson  
Lender         Nationwide Life Insurance Company  
Effective rate         3.74%  
Principal balance outstanding   43,000,000     $ 43,000,000  
Loan maturity date         Aug. 01, 2024  
Secured Debt [Member] | Liberty Towers [Member]            
Debt Instrument [Line Items]            
Property Name         Liberty Towers (e)  
Lender         American General Life Insurance Company  
Effective rate         3.37%  
Principal balance outstanding   265,000,000     $ 265,000,000  
Loan maturity date         Oct. 01, 2024  
Secured Debt [Member] | Liberty Towers [Member] | Construction Loan [Member]            
Debt Instrument [Line Items]            
Additional borrowing capacity       $ 33,000,000    
Repayment of revolving credit facility and money market loans       $ 265,000,000    
Secured Debt [Member] | The Charlotte [Member]            
Debt Instrument [Line Items]            
Property Name         The Charlotte (f)  
Lender         QuadReal Finance  
Effective rate         2.70%  
Principal balance outstanding   161,544,000     $ 183,863,000  
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 (g)  
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 [Member]            
Debt Instrument [Line Items]            
Property Name         Marbella (BLVD 425)  
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 (BLVD 401)  
Lender         New York Life Insurance Company  
Effective rate         4.29%  
Principal balance outstanding   117,000,000     $ 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     $ 63,000,000  
Loan maturity date         Dec. 10, 2026  
Secured Debt [Member] | Short Hills Portfolio [Member]            
Debt Instrument [Line Items]            
Property Name         Short Hills Portfolio (h)  
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  
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] | Monaco (BLVD 495 N/S) [Member]            
Debt Instrument [Line Items]            
Property Name         Monaco (BLVD 495 N/S) (l)  
Lender         The Northwestern Mutual Life Insurance Co.  
Effective rate         2.91%  
Principal balance outstanding   $ 165,000,000     $ 165,000,000  
Loan maturity date   Nov. 01, 2027 Feb. 01, 2021   Nov. 10, 2027  
Guaranteed amount         $ 12,000,000  
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  
Percent of principal loan outstanding         10.00%  
Secured Debt [Member] | Soho Lofts [Member]            
Debt Instrument [Line Items]            
Property Name         Soho Lofts (i)  
Lender         New York Community Bank  
Effective rate         3.77%  
Principal balance outstanding   160,000,000     $ 160,000,000  
Loan maturity date         Jul. 01, 2029  
Secured Debt [Member] | Riverwatch Commons [Member]            
Debt Instrument [Line Items]            
Effective percentage after five years         2.75%  
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     $ 150,000,000  
Loan maturity date         Sep. 01, 2029  
Secured Debt [Member] | Port Imperial 4/5 Garage Development [Member]            
Debt Instrument [Line Items]            
Property Name         Port Imperial South 4/5 Garage (j)  
Lender         American General Life & A/G PC  
Effective rate         4.85%  
Principal balance outstanding   33,138,000     $ 33,023,000  
Deferred interest         $ 800,000  
Deferred interest and payment end date         Dec. 31, 2020  
Secured Debt [Member] | Emery At Overlook Ridge [Member]            
Debt Instrument [Line Items]            
Property Name         Emery at Overlook Ridge (k)  
Lender         New York Community Bank  
Effective rate         3.21%  
Principal balance outstanding   $ 72,000,000     $ 72,000,000  
Loan maturity date   Jan. 01, 2031     Jan. 01, 2031  
Mortgage loan   $ 72,000,000        
Gain (loss) on sale of property   $ 10,400,000