Our portfolio of operating properties was comprised of the following office properties at December 31, 2012. During the fourth quarter of 2012 we disposed of our industrial portfolio and, as a result, no longer owned any industrial properties at December 31, 2012 (see Note 17 and 18 for further discussion).



	Number of Buildings	Rentable Square Feet (unaudited)	Number of Tenants	Percent Occupied
Office Properties	114	13,249,780	530	92.8	%

Our stabilized portfolio includes all of our properties with the exception of undeveloped land, development and redevelopment properties currently under construction or committed for construction including 9455 Towne Center in San Diego, CA, which was moved from the stabilized portfolio to the development pipeline in the fourth quarter of 2012, "lease-up" properties and properties held-for-sale. We define redevelopment properties as those projects for which we expect to spend significant development and construction costs on existing or acquired buildings pursuant to a formal plan, the intended result of which is a higher economic return on the property. We define "lease-up" properties as properties we recently developed or redeveloped that have not yet reached 95% occupancy and are within one year following cessation of major construction activities. As of December 31, 2012, the following properties were excluded from our stabilized portfolio:



	Number of Properties	Estimated Rentable Square Feet (unaudited) ⁽¹⁾
Development properties under construction	4	1,416,000
Redevelopment properties under construction	1	410,000
Lease-up properties	1	98,000

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(1) Estimated rentable square feet upon completion.