Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details) (USD $)
 1 Months Ended 12 Months Ended
Aug. 31, 2010
Dec. 31, 2011
Y
lease
property
Tax incremental financing obligation    
The amount of tax incremental financing bonds issued by Anne Arundel County, Maryland $ 30,000,000  
Liability recognized with regard to tax incremental financing obligation at end of current period   4,400,000
Ground Leases    
Number of ground leases under which the entity is obligated as lessee   2
Increments for future minimum rent increases between 2020 and 2100 (in years)   10
Future minimum rental payments due:    
2012   483,000
2013   483,000
2014   483,000
2015   483,000
2016   483,000
Thereafter   61,789,000
Total   64,204,000
Environmental Indemnity Agreement    
Number of lease properties which were provided environmental indemnifications   3
Environmental indemnification to the tenant against losses covered under prior owner's indemnity agreement   5,000,000
Length of environmental indemnification to the tenant against consequential damages at a building after the tenant's acquisition of the property (in years)   15
Maximum environmental indemnification to the tenant against consequential damages after acquisition of property   12,500,000
Additional costs agreed to be paid by the entity related to construction and environmental regulatory activities (as a percent)   50.00%
Maximum annual additional costs agreed to be paid by the entity related to construction and environmental regulatory activities   300,000
Maximum additional costs agreed to be paid by the entity related to construction and environmental regulatory activities   1,500,000
Nonrecourse loan guarantees of unconsolidated partnership
    
Joint Ventures    
Maximum approximate amount required to be paid under the guarantees   $ 65,000,000
Recovery percentage of amount paid under the guarantee when the entity continues to manage the properties   20.00%
Recovery percentage of amount paid under the guarantee when the entity no longer manages the properties   80.00%
Arundel Preserve 5, LLC, Date Acquired 7/2/2007
    
Joint Ventures    
Maximum amount of office space to be developed through the joint venture (in square feet)   1,800,000
Land available to develop office space (in acres)   63
Ownership (as a percent)   50.00%