Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Summary of minimum commitment
2013	$ 3,685
2014	3,095
2015	3,095
2016	3,095
2017	3,095
Thereafter	160,007
Total	$ 176,072	[1],[2],[3],[4],[5]

[1] Reflects the minimum ground lease obligations before the impact of ground lease extension options.

[2] One of our ground lease obligations is subject to a fair market value adjustment every five years based on a combination of CPI adjustments and third-party appraisals limited to maximum increases annually. The contractual obligations included above assumes the annual lease rental obligation in effect as of December 31, 2012.

[3] One of our ground lease obligations is subject to a fair market value adjustment every five years; however, the lease includes ground rent subprotection and infrastructure rent credits which currently limit our annual rental obligations to $1.0 million. The contractual obligations for that ground lease included above assumes the lesser of $1.0 million or annual lease rental obligation in effect as of December 31, 2012.

[4] As previously discussed, the Company exercised the land purchase option included in the 360 3rd Street ground lease and will acquire the land in the second quarter of 2013. The amount presented above includes payments through the second quarter of 2013 and excludes the purchase price of $27.5 million.

[5] One of our ground lease obligations includes a component which is based on the percentage of gross income that exceeds the minimum ground rent. The minimum rent is subject to increases every five years based on 50% of the average annual percentage rent for the previous five years. Currently, gross income does not exceed the threshold requiring us to pay percentage rent. The contractual obligations for that ground lease included above assumes the annual lease rental obligation in effect as of December 31, 2012.