Annual report pursuant to Section 13 and 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 $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Mortgages, Loans Payable And Other Obligations [Line Items]    
Mortgages, loans payable and other obligations $ 739,448,000 $ 743,043,000
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]  
Loan maturity date Dec. 01, 2012 [1]  
Mortgages, loans payable and other obligations 16,171,000 [1] 16,171,000 [1]
Impairment charge on property   9,500,000
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 11,000,000 [3] 11,000,000 [3]
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 15,531,000 16,089,000
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 4,479,000 4,646,000
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 6,245,000 6,475,000
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 10,781,000 11,270,000
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 5,899,000 6,103,000
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 19,051,000 19,341,000
6 Becker, 85 Livingston, 75 Livingston And 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 62,127,000 61,224,000
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 14,438,000 14,395,000
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 15,908,000 15,606,000
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 37,769,000 37,096,000
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 12,056,000 11,599,000
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 11,844,000 11,467,000
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 3,886,000 3,893,000
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 150,000,000 [4] 150,000,000 [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 31,002,000 31,537,000
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 231,603,000 234,521,000
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 19,241,000 19,443,000
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 44,079,000 [5] 44,540,000 [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% [6],[7]  
Loan maturity date Jul. 01, 2034 [6]  
Mortgages, loans payable and other obligations $ 16,338,000 [6] $ 16,627,000 [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] The property does not generate sufficient cash flow to meet debt service requirements. As a result, beginning January 2011, debt service has not been made and the Company is currently in discussion with the lender regarding a deed in lieu of foreclosure. As of December 31, 2010, the Company estimated that the carrying value of the property may not be recoverable over its anticipated holding period. In order to reduce the carrying value of the property to its estimated fair market value, the Company recorded an impairment charge of approximately $9.5 million in 2010.
[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.