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) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Mortgages Loans Payable And Other Obligations [Line Items]    
Mortgages, loans payable and other obligations $ 722,280 $ 739,448
2200 Renaissance Boulevard [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 2200 Renaissance Boulevard (b) [1]  
Lender Wachovia CMBS [1]  
Effective Interest Rate 5.888% [1],[2]  
Mortgages, loans payable and other obligations   16,171 [1]
One Grande Commons [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name One Grande Commons (c) [3]  
Lender Capital One Bank [3]  
LIBOR LIBOR +2.00% [2],[3]  
Effective Interest Rate 2.00%  
Loan maturity date Dec. 31, 2012 [3]  
Mortgages, loans payable and other obligations 11,000 [3] 11,000 [3]
Number of extension options 2  
Mortgage loan, extension period (in years) 1  
Soundview Plaza [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name Soundview Plaza  
Lender Morgan Stanley Mortgage Capital  
Effective Interest Rate 6.015% [2]  
Loan maturity date Jan. 01, 2013  
Mortgages, loans payable and other obligations 15,387 15,531
9200 Edmonston Road [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 9200 Edmonston Road  
Lender Principal Commercial Funding L.L.C.  
Effective Interest Rate 5.534% [2]  
Loan maturity date May 01, 2013  
Mortgages, loans payable and other obligations 4,436 4,479
6305 Ivy Lane [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 6305 Ivy Lane  
Lender John Hancock Life Insurance Co.  
Effective Interest Rate 5.525% [2]  
Loan maturity date Jan. 01, 2014  
Mortgages, loans payable and other obligations 6,185 6,245
395 West Passaic [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 395 West Passaic  
Lender State Farm Life Insurance Co.  
Effective Interest Rate 6.004% [2]  
Loan maturity date May 01, 2014  
Mortgages, loans payable and other obligations 10,654 10,781
6301 Ivy Lane [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 6301 Ivy Lane  
Lender John Hancock Life Insurance Co.  
Effective Interest Rate 5.52% [2]  
Loan maturity date Jul. 01, 2014  
Mortgages, loans payable and other obligations 5,846 5,899
35 Waterview Boulevard [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 35 Waterview Boulevard  
Lender Wachovia CMBS  
Effective Interest Rate 6.348% [2]  
Loan maturity date Aug. 11, 2014  
Mortgages, loans payable and other obligations 18,975 19,051
6 Becker, 85 Livingston, 75 Livingston & 20 Waterview [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 6 Becker, 85 Livingston, 75 Livingston & 20 Waterview  
Lender Wachovia CMBS  
Effective Interest Rate 10.22% [2]  
Loan maturity date Aug. 11, 2014  
Mortgages, loans payable and other obligations 62,367 62,127
4 Sylvan [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 4 Sylvan  
Lender Wachovia CMBS  
Effective Interest Rate 10.19% [2]  
Loan maturity date Aug. 11, 2014  
Mortgages, loans payable and other obligations 14,449 14,438
10 Independence [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 10 Independence  
Lender Wachovia CMBS  
Effective Interest Rate 12.44% [2]  
Loan maturity date Aug. 11, 2014  
Mortgages, loans payable and other obligations 15,990 15,908
4 Becker [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 4 Becker  
Lender Wachovia CMBS  
Effective Interest Rate 9.55% [2]  
Loan maturity date May 11, 2016  
Mortgages, loans payable and other obligations 37,886 37,769
5 Becker [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 5 Becker  
Lender Wachovia CMBS  
Effective Interest Rate 12.83% [2]  
Loan maturity date May 11, 2016  
Mortgages, loans payable and other obligations 12,161 12,056
210 Clay [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 210 Clay  
Lender Wachovia CMBS  
Effective Interest Rate 13.42% [2]  
Loan maturity date May 11, 2016  
Mortgages, loans payable and other obligations 11,947 11,844
51 Imclone [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 51 Imclone  
Lender Wachovia CMBS  
Effective Interest Rate 8.39% [2]  
Loan maturity date May 11, 2016  
Mortgages, loans payable and other obligations 3,884 3,886
Various [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name Various (d) [4]  
Lender Prudential Insurance [4]  
Effective Interest Rate 6.332% [2],[4]  
Loan maturity date Jan. 15, 2017 [4]  
Mortgages, loans payable and other obligations 150,000 [4] 150,000 [4]
23 Main Street [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 23 Main Street  
Lender JPMorgan CMBS  
Effective Interest Rate 5.587% [2]  
Loan maturity date Sep. 01, 2018  
Mortgages, loans payable and other obligations 30,862 31,002
Harborside Plaza 5 [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name Harborside Plaza 5  
Lender The Northwestern Mutual Life Insurance Co. & New York Life Insurance Co.  
Effective Interest Rate 6.842% [2]  
Loan maturity date Nov. 01, 2018  
Mortgages, loans payable and other obligations 230,842 231,603
100 Walnut Avenue [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 100 Walnut Avenue  
Lender Guardian Life Insurance Co.  
Effective Interest Rate 7.311% [2]  
Loan maturity date Feb. 01, 2019  
Mortgages, loans payable and other obligations 19,189 19,241
One River Center [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name One River Center (e) [5]  
Lender Guardian Life Insurance Co. [5]  
Effective Interest Rate 7.311% [2],[5]  
Loan maturity date Feb. 01, 2019 [5]  
Mortgages, loans payable and other obligations 43,958 [5] 44,079 [5]
581 Main Street [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 581 Main Street (f) [6]  
Lender Valley National Bank [6]  
Effective Interest Rate 6.935% [2],[6],[7]  
Loan maturity date Jul. 01, 2034 [8]  
Mortgages, loans payable and other obligations $ 16,262 [6] $ 16,338 [6]
Basis points of the interest rate at the reset period 225  
Treasury yield period (in years) 10  
Number of days prior to reset date that interest rate will be reset 45  
Minimum interest rate for the loan after the reset period 6.875%  
Coupon Interest Rate Reset One [Member] | 581 Main Street [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Interest rate will be reset after the end of period (in years) 10  
Coupon Interest Rate Reset Two [Member] | 581 Main Street [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Interest rate will be reset after the end of period (in years) 20  
[1] On March 28, 2012, the Company transferred the deed for 2200 Renaissance Boulevard to the lender in satisfaction of its obligations.
[2] Reflects effective rate of debt, including deferred financing costs, comprised of the cost of terminated treasury lock agreements (if any), debt initiation costs, mark-to-market adjustment of acquired debt and other transaction costs, as applicable.
[3] The mortgage loan has two one-year extension options subject to certain conditions and the payment of a fee.
[4] Mortgage is collateralized by seven properties. The Operating Partnership has agreed, subject to certain conditions, to guarantee repayment of a portion of the loan.
[5] Mortgage is collateralized by the three properties comprising One River Center.
[6] The Operating Partnership has agreed, subject to certain conditions, to guarantee repayment of a portion of the loan
[7] The coupon interest rate will be reset at the end of year 10 (2019) and year 20 (2029) at 225 basis points over the 10-year treasury yield 45 days prior to the reset dates with a minimum rate of 6.875 percent.
[8] The Operating Partnership has agreed, subject to certain conditions, to guarantee repayment of a portion of the loan.