Caesar Gracie's place is in Pleasant Hill/Concord, but they're hush hush and closed off to most people.
There's a place in Tracy (about 45 minutes from San Jose barring traffic), called Charlie Gracie's JIu Jistu, but there's questions that he's a real gracie. From what I undestand, they ahve solid BJJ guys there though, but nobody again knows about he credentials.
Fairtex in San Francisco has quality instruction for 300 a month.