Quarterly report pursuant to Section 13 or 15(d)

Commitments And Contingencies (Narrative) (Details)

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Commitments And Contingencies (Narrative) (Details) (USD $)
3 Months Ended 0 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Harborside Plaza 4-A Agreement [Member]
Y
Mar. 31, 2011
Harborside Plaza 4-A Agreement [Member]
Mar. 31, 2012
Harborside Plaza 5 Agreement [Member]
Y
Mar. 31, 2011
Harborside Plaza 5 Agreement [Member]
Mar. 31, 2012
Property Lock-Ups [Member]
Mar. 31, 2012
Property Lock-Ups Expired [Member]
Dec. 05, 2011
Harborside Residential Project [Member]
sqft
Mar. 31, 2012
Harborside Residential Project [Member]
Mar. 31, 2012
Ironstate Development LLC [Member]
Aug. 31, 2011
Wyndham [Member]
sqft
Mar. 31, 2012
Wyndham [Member]
Commitments And Contingencies [Line Items]                          
Project period (years)     20   20                
Percentage of PILOT on project costs     2.00%   2.00%                
Total project costs     $ 49,500,000   $ 170,900,000                
Payments in lieu of property taxes (PILOT)     247,000 247,000 854,000 854,000              
Ground lease expense incurred 102,000 102,000                      
Properties aggregate net book value             131,000,000 1,700,000,000          
Expiration year             2016            
Number of properties             7 128          
Percentage of interest in venture                   85.00%      
Area of building, square feet                       203,000  
Lease term description                         15 years and three months, subject to two extension options of between five and 10 years
Delivery date to tenant                       first quarter of 2013  
Total estimated costs of the project                 380,000,000     53,500,000  
Costs of the project incurred                         $ 18,200,000
Area of office property, in square feet                 2,000,000        
Number of apartment units in each tower                 630        
Holding and distribution pattern under operating agreement                
Pursuant to the Development Agreement, the Company and Ironstate shall co-develop the Harborside Residential Project with Ironstate responsible for obtaining all required development permits and approvals.  Major decisions with respect to the Harborside Residential Project will require the consent of the Company and Ironstate.  The Company and Ironstate will have 85 and 15 percent interests, respectively, in the Harborside Residential Project.  The Company will receive capital credit of $30 per approved developable square foot for its land.
       
Ownership percentage of third party venture                     15.00%    
Capital credit receivable per square foot                   30