Annual report pursuant to Section 13 and 15(d)

Investments In Unconsolidated Joint Ventures (PruRose Port Imperial South 15, L.L.C) (Narrative) (Details)

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Investments In Unconsolidated Joint Ventures (PruRose Port Imperial South 15, L.L.C) (Narrative) (Details) (PruRose Port Imperial South 15, L.L.C. [Member], USD $)
 2 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
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Oct. 23, 2012
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Schedule of Equity Method Investments [Line Items]      
Percentage of interest in venture     50.00%
Number of units     236
Area of property (in square feet)     214,402
Third party ownership percentage     50.00%
Percentage of operating return on capital   9.00%  
Percent of distributions paid to third party after threshold reached   20.00%  
Threshold of internal rate of return for distributions to third party   8.00%  
Mortgage loans, carrying amount $ 57,000,000 $ 57,000,000  
Spread over LIBOR 2.35% 2.35%  
Mortgage loan, maturity date   June 2013  
Number of extension options   2  
Loan extension period   1 year  
Interest rate 3.78% 3.78%  
Management, leasing and other services fees 47,000    
Holding and distribution pattern under operating agreement   In general, the operating agreement of Port Imperial 15 provides that operating cash flows are distributed to members first to Prudential-Port and then to the Company based on a nine percent operating return on each members' capital balance in priorities as detailed in the operating agreement. Excess operating cash flows are distributed to the members in accordance with their ownership percentages.  
Prudential-Port [Member]
      
Schedule of Equity Method Investments [Line Items]      
Capital balance 33,300,000 33,300,000  
Accumulated unpaid operating return $ 3,700,000 $ 3,700,000  
Mortgage Loan Extension Number 1 [Member]
      
Schedule of Equity Method Investments [Line Items]      
Extension fee   0.25%  
Mortgage Loan Extension Number 2 [Member]
      
Schedule of Equity Method Investments [Line Items]      
Extension fee   0.25%