They are building their own private terminal at San Jose airport [1].
1. http://www.mercurynews.com/ci_23041939/san-jose-city-council...
1. http://www.mercurynews.com/ci_23041939/san-jose-city-council...
"Signature's project includes seven hangars for corporate jets, with five of those hangars to be used by Blue City Holdings, its primary tenant. That company will manage aircraft for Google co-founders Larry Page and Sergey Brin and Google Executive Chairman Eric Schmidt, whose private jets are now parked at Moffett Field, where their lease is up next year."