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Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2012
Significant Accounting Policies [Abstract]  
Schedule of depreciation and amortization on the estimated useful life of assets or liabilities
     
Description   Standard Depreciable Life

Land

  Not depreciated

Building

  40 years

Building Improvements

  5-40 years

Tenant Improvements

  Shorter of lease term or useful life

Leasing Costs

  Lease term

In-place leases

  Lease term

Above/Below Market Leases

  Lease term