Annual report pursuant to Section 13 and 15(d)

Commitments And Contingencies (Narrative) (Details)

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Commitments And Contingencies (Narrative) (Details) (USD $)
12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Harborside Residential Project [Member]
property
Dec. 31, 2012
Harborside Residential Project [Member]
Parent Company [Member]
Aug. 31, 2011
Wyndham [Member]
item
sqft
Dec. 31, 2012
Wyndham [Member]
Dec. 31, 2012
Wegmans Food Markets, Inc. [Member]
Jul. 31, 2012
Wegmans Food Markets, Inc. [Member]
sqft
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2012
Minimum [Member]
Wyndham [Member]
Dec. 31, 2012
Maximum [Member]
Dec. 31, 2012
Maximum [Member]
Wyndham [Member]
Dec. 31, 2012
Harborside Financial Center Plaza 4A [Member]
Dec. 31, 2011
Harborside Financial Center Plaza 4A [Member]
Dec. 31, 2010
Harborside Financial Center Plaza 4A [Member]
Dec. 31, 2012
Harborside Financial Center Plaza 5 [Member]
Dec. 31, 2011
Harborside Financial Center Plaza 5 [Member]
Dec. 31, 2010
Harborside Financial Center Plaza 5 [Member]
Dec. 31, 2012
Property Lock-Ups [Member]
property
Dec. 31, 2012
Property Lock-Ups Expired [Member]
property
Dec. 31, 2012
Land [Member]
Wyndham [Member]
Dec. 31, 2012
Port Imperial 4/5 Garage Development [Member]
Dec. 31, 2012
Weehawken, New Jersey [Member]
item
Dec. 31, 2012
Weehawken, New Jersey [Member]
Land [Member]
Commitments And Contingencies [Line Items]                                                  
Project period                           20 years     20 years           5 years    
Percentage of PILOT on project costs                           2.00%     2.00%                
Total project costs               $ 14,400,000           $ 49,500,000     $ 170,900,000             $ 500,000  
Payments in lieu of property taxes (PILOT)                           990,000 990,000 1,200,000 3,400,000 3,400,000 3,800,000            
Period of real estate taxes phase in                                             5 years    
Ground lease expense incurred 406,000 406,000 490,000                                            
Number of properties                                       7 126        
Properties aggregate net book value                                       129,700,000 1,700,000,000        
Expiration year                                       2016          
Area of property (in square feet)           203,000     140,000                                
Lease term             15 years 3 months                                    
Number of lease extension options           2                                      
Lease extension term                     5 years   10 years                        
Delivery date to tenant       third quarter of 2015     first quarter of 2013 first quarter of 2014                                  
Total estimated costs of the project       246,000,000     51,700,000                                    
Costs of the project incurred             35,100,000 1,000,000                           13,000,000      
Number of apartments       763                                          
Percentage of interest in venture       85.00%           7.50%   80.00%                          
Ownership percentage of third party venture       15.00%                                          
Capital credit receivable per square foot       30                                          
Amount to fund         47,000,000                                        
Number of stories                                               5  
Number of parking spaces                                               850  
Investment in property 3,901,222,000 3,870,607,000                                           69,400,000 13,100,000
Total investment in rental property $ 3,901,222,000 $ 3,870,607,000                                           $ 69,400,000 $ 13,100,000
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. In addition to the capital credit it will receive for its land contribution, the Company currently expects that it will fund approximately $47 million of the development costs of the project.