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 9 Months Ended
Apr. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2021
USD ($)
item
Sep. 30, 2020
USD ($)
Oct. 27, 2021
USD ($)
Jan. 31, 2020
USD ($)
Debt Instrument [Line Items]            
Principal balance outstanding   $ 2,801,797,000 $ 2,374,947,000      
Repayment of revolving credit facility and money market loans     $ 37,000,000 $ 364,000,000    
RXR - Short Hills [Member]            
Debt Instrument [Line Items]            
Loan maturity date     Apr. 01, 2027      
Port Imperial 4/5 Garage Development [Member]            
Debt Instrument [Line Items]            
Loan maturity date     Dec. 01, 2029      
Deferred interest     $ 800,000      
Subsequent Event [Member] | Short Hills Residential [Member]            
Debt Instrument [Line Items]            
Mortgage loan         $ 75,000,000  
Secured Debt [Member]            
Debt Instrument [Line Items]            
Principal balance outstanding   2,218,862,000 2,212,663,000      
Unamortized deferred financing costs   (14,718,000) (11,716,000)      
Total mortgages, loans payable and other obligations, net   2,204,144,000 $ 2,200,947,000      
Secured Debt [Member] | Port Imperial South 4/5 Retail [Member]            
Debt Instrument [Line Items]            
Property Name     Port Imperial South 4/5 Retail (m)      
Lender     American General Life & A/G PC      
Effective rate     4.56%      
Principal balance outstanding   3,866,000 $ 3,813,000      
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 $ 89,000,000      
Loan maturity date     Apr. 01, 2023      
Loan extension period     6 months      
Guaranteed amount     $ 14,500,000      
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 $ 79,609,000      
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      
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     Upton-Short Hills (d)      
Lender     People's United Bank      
Effective rate     2.15%      
Principal balance outstanding   42,459,000 $ 57,171,000      
Loan maturity date     Mar. 26, 2023      
Secured Debt [Member] | Short Hills Residential [Member] | Construction Loan [Member]            
Debt Instrument [Line Items]            
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]            
Maximum borrowing capacity           $ 265,000,000
Additional borrowing capacity           $ 33,000,000
Secured Debt [Member] | The Charlotte [Member]            
Debt Instrument [Line Items]            
Property Name     Haus 25 (f)      
Lender     QuadReal Finance      
Effective rate     2.70%      
Principal balance outstanding   161,544,000 $ 237,288,000      
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     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     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] | RXR - Short Hills [Member]            
Debt Instrument [Line Items]            
Property Name     RXR - Short Hills (h)      
Lender     Wells Fargo CMBS      
Effective rate     4.15%      
Principal balance outstanding   124,500,000        
Closing costs to defease loan $ 22,600,000          
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     BLVD 475 N/S (i)      
Lender     The Northwestern Mutual Life Insurance Co.      
Effective rate     2.91%      
Principal balance outstanding   165,000,000 $ 165,000,000      
Loan maturity date     Nov. 10, 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      
Percent of principal loan outstanding     10.00%      
Secured Debt [Member] | Soho Lofts [Member]            
Debt Instrument [Line Items]            
Property Name     Soho Lofts (j)      
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 (k)      
Lender     American General Life & A/G PC      
Effective rate     4.85%      
Principal balance outstanding   33,138,000 $ 32,784,000      
Secured Debt [Member] | Emery At Overlook Ridge [Member]            
Debt Instrument [Line Items]            
Property Name     Emery at Overlook Ridge (l)      
Lender     New York Community Bank      
Effective rate     3.21%      
Principal balance outstanding   72,000,000 $ 72,000,000      
Loan maturity date     Jan. 01, 2031      
Mortgage loan   72,000,000        
Gain (loss) on sale of property   $ 10,400,000