Quarterly report pursuant to Section 13 or 15(d)

Investments In Unconsolidated Joint Ventures (Red Bank Corporate Plaza, L.L.C.) (Narrative) (Details)

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Investments In Unconsolidated Joint Ventures (Red Bank Corporate Plaza, L.L.C.) (Narrative) (Details) (USD $)
0 Months Ended 3 Months Ended 9 Months Ended
Jul. 15, 2013
Sep. 30, 2013
Red Bank Corporate Plaza, L.L.C. [Member]
sqft
Sep. 30, 2012
Red Bank Corporate Plaza, L.L.C. [Member]
Sep. 30, 2013
Red Bank Corporate Plaza, L.L.C. [Member]
sqft
Sep. 30, 2012
Red Bank Corporate Plaza, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]          
Area of property (in square feet)   92,878   92,878  
Lease expiration date       Sep. 30, 2017  
Percentage of interest in venture   50.00%   50.00%  
Mortgage loans, carrying amount   $ 16,800,000   $ 16,800,000  
Spread over LIBOR 1.25%     3.00%  
Mortgage loan, maturity date       May 2016  
LIBOR interest rate   0.18%   0.18%  
Percentage of loan that has a fixed interest rate   75.00%   75.00%  
Fixed interest rate   3.99375%   3.99375%  
Management, leasing and other services fees   $ 26,000 $ 25,000 $ 80,000 $ 75,000