I'm not sure what this area is called: Creekland maybe?
I imagine the shop staff will probably have this conversation:
"Do you know where Berryessa BART is by the flea market?"
"Ohhh yeah! I do."
"It's across the street from Berryessa BART, on Mabury Road, by the South side of the Terminal. Would you like the address? You can type the address into the car's navigation and it will bring you right here."
Driving access depends on driving direction. The easiest and what I would always advise is from I-680, which means just take Berryessa Road Exit, and is the nicest drive. You would go South from there to Mabury Road on one of the perpendicular streets (Jackson (nicer), Lundy (shorter)). Anything else and I'd advise to use the car's navigation, since it's easy to get lost around there with many twists and turns to get there, and you don't want to get lost in most of those neighborhoods, being as how that's the Trash District all the way from the Flea Market by the BART terminal all the way up to the Homeless Shelter by 880, literally hundreds of industrial companies dealing with recycling, toxic waste, and trash of every imaginable material, and the types of residential neighborhoods that result around there and 101 are not known for being "safe", so to speak. If coming North on 101, nav might put you on McKee, which is also a rough neighborhood.
I'm not sure what that means, or if they got the temporary occupancy permit. But speculating... maybe this is intended to be a prototype for a future network of CPO refurb centers?
It fits with the larger neighborhood's recycling motif. That particular couple block area sports a few auto shops of sorts, as well. I don't know how zoning in that region works with respect to a Tesla shop; often you have to file for the most extreme behavior which covers all expected behaviors. This could be a special spot or just another regular service center. For all I know, they will refurbish CPO's, and that fits the definition of recycling for some type of beneficial tax category, and it will be publically faced as a general service center with a side business of CPO sales. Recycling a whole car intact is a pretty good "green" behavior compared to tearing it down. On the other hand, watch me be surprised by this being the first place they really start tearing down the cars and recycling each component, seeing as how they're in the right neighborhood for that, too.