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Future Minimum Lease Receipts
3 Months Ended
Mar. 31, 2013
Operating Leases, Future Minimum Payments Receivable [Abstract]  
Future Minimum Lease Receipts
Future Minimum Lease Receipts

We lease space to tenants primarily under non-cancelable operating leases that generally contain provisions for a base rent plus reimbursement for certain operating expenses.  Operating expense reimbursements are reflected in our consolidated statements of operations as tenant recoveries.

We also lease space to certain tenants under non-cancelable leases that provide for percentage rents based upon tenant revenues.  Percentage rental income for the three months ended March 31, 2013 and 2012 totaled $166 thousand and $175 thousand, respectively.

Future minimum base rentals on our non-cancelable office and ground operating leases at March 31, 2013 were as follows (in thousands):
Three months ending March 31:
 
2014
$
356,059

2015
311,422

2016
261,774

2017
211,515

2018
167,815

Thereafter
428,541

Total future minimum base rentals
$
1,737,126



The above future minimum lease receipts exclude residential leases, which typically have a term of one year or less, as well as tenant reimbursements, amortization of deferred rent receivables and above/below-market lease intangibles.  Some leases are subject to termination options, generally upon payment of a termination fee.  The preceding table assumes that these options are not exercised.