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
 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Mortgages Loans Payable And Other Obligations [Line Items]    
Mortgages, loans payable and other obligations $ 704,940 $ 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 Rate 5.888% [1],[2]  
Mortgages, loans payable and other obligations   16,171 [1]
Soundview Plaza [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name Soundview Plaza (c) [3]  
Lender Morgan Stanley Mortgage Capital [3]  
Effective Rate 6.015% [2],[3]  
Mortgages, loans payable and other obligations   15,531 [3]
One Grande Commons [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name One Grande Commons (d) [4]  
Lender Capital One Bank [4]  
LIBOR LIBOR+2.00 [2],[4]  
Effective Rate 2.00% [2]  
Mortgages, loans payable and other obligations 11,000 [4] 11,000 [4]
Loan maturity date Dec. 31, 2012 [4]  
Number of extension options 2  
Mortgage loan, extension period 1 year  
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 Rate 5.534% [2]  
Mortgages, loans payable and other obligations 4,349 4,479
Loan maturity date May 01, 2013  
6305 Ivy Lane [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 6305 Ivy Lane  
Lender John Hancock Life Insurance Co.  
Effective Rate 5.525% [2]  
Mortgages, loans payable and other obligations 6,064 6,245
Loan maturity date Jan. 01, 2014  
395 West Passaic [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 395 West Passaic  
Lender State Farm Life Insurance Co.  
Effective Rate 6.004% [2]  
Mortgages, loans payable and other obligations 10,396 10,781
Loan maturity date May 01, 2014  
6301 Ivy Lane [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 6301 Ivy Lane  
Lender John Hancock Life Insurance Co.  
Effective Rate 5.52% [2]  
Mortgages, loans payable and other obligations 5,739 5,899
Loan maturity date Jul. 01, 2014  
35 Waterview Boulevard [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 35 Waterview Boulevard  
Lender Wachovia CMBS  
Effective Rate 6.348% [2]  
Mortgages, loans payable and other obligations 18,826 19,051
Loan maturity date Aug. 11, 2014  
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 Rate 10.22% [2]  
Mortgages, loans payable and other obligations 62,867 62,127
Loan maturity date Aug. 11, 2014  
4 Sylvan [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 4 Sylvan  
Lender Wachovia CMBS  
Effective Rate 10.19% [2]  
Mortgages, loans payable and other obligations 14,473 14,438
Loan maturity date Aug. 11, 2014  
10 Independence [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 10 Independence  
Lender Wachovia CMBS  
Effective Rate 12.44% [2]  
Mortgages, loans payable and other obligations 16,161 15,908
Loan maturity date Aug. 11, 2014  
4 Becker [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 4 Becker  
Lender Wachovia CMBS  
Effective Rate 9.55% [2]  
Mortgages, loans payable and other obligations 38,148 37,769
Loan maturity date May 11, 2016  
5 Becker [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 5 Becker  
Lender Wachovia CMBS  
Effective Rate 12.83% [2]  
Mortgages, loans payable and other obligations 12,391 12,056
Loan maturity date May 11, 2016  
210 Clay [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 210 Clay  
Lender Wachovia CMBS  
Effective Rate 13.42% [2]  
Mortgages, loans payable and other obligations 12,162 11,844
Loan maturity date May 11, 2016  
51 Imclone [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 51 Imclone  
Lender Wachovia CMBS  
Effective Rate 8.39% [2]  
Mortgages, loans payable and other obligations 3,880 3,886
Loan maturity date May 11, 2016  
Various [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name Various (e) [5]  
Lender Prudential Insurance [5]  
Effective Rate 6.332% [2],[5]  
Mortgages, loans payable and other obligations 149,715 [5] 150,000 [5]
Loan maturity date Jan. 15, 2017 [5]  
Number of properties used to collateralized mortgage 7  
23 Main Street [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 23 Main Street  
Lender JPMorgan CMBS  
Effective Rate 5.587% [2]  
Mortgages, loans payable and other obligations 30,586 31,002
Loan maturity date Sep. 01, 2018  
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 Rate 6.842% [2]  
Mortgages, loans payable and other obligations 229,281 231,603
Loan maturity date Nov. 01, 2018  
100 Walnut Avenue [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 100 Walnut Avenue  
Lender Guardian Life Insurance Co.  
Effective Rate 7.311% [2]  
Mortgages, loans payable and other obligations 19,080 19,241
Loan maturity date Feb. 01, 2019  
One River Center [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name One River Center (f) [6]  
Lender Guardian Life Insurance Co. [6]  
Effective Rate 7.311% [2],[6]  
Mortgages, loans payable and other obligations 43,710 [6] 44,079 [6]
Loan maturity date Feb. 01, 2019 [6]  
Number of properties used to collateralized mortgage 3  
581 Main Street [Member]
    
Mortgages Loans Payable And Other Obligations [Line Items]    
Property Name 581 Main Street (g) [7]  
Lender Valley National Bank [7]  
Effective Rate 6.935% [2],[7],[8]  
Mortgages, loans payable and other obligations $ 16,112 [7] $ 16,338 [7]
Loan maturity date Jul. 01, 2034 [7]  
Basis points of the interest rate at the reset period 2.25%  
Treasury yield period 10 years  
Period prior to reset date that interest rate will be reset 45 days  
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 10 years  
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 20 years  
[1] On March 28, 2012, the Company transferred the deed for 2200 Renaissance Boulevard to the lender in satisfaction of its obligations. See Note 7: Discontinued Operations. On September 4, 2012, the Company repaid this mortgage loan at par, using borrowings under the Company’s unsecured revolving credit facility.
[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] On September 4, 2012, the Company repaid this mortgage loan at par, using borrowings under the Company’s unsecured revolving credit facility.
[4] The mortgage loan has two one-year extension options, subject to certain conditions and the payment of a fee.
[5] Mortgage is collateralized by seven properties. The Operating Partnership has agreed, subject to certain conditions, to guarantee repayment of a portion of the loan.
[6] Mortgage is collateralized by the three properties comprising One River Center.
[7] The Operating Partnership has agreed, subject to certain conditions, to guarantee repayment of a portion of the loan.
[8] 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.