The ideal Tesla service/delivery site would be the old Seaside Pontiac-Buick-GMC dealership off of Miramar near the 805, (6435 Miramar Rd, San Diego, CA). Full dealership facilities (garages, lifts, lots of parking, showroom/delivery area), easy access, and essentially vacant now (only used as a parking lot for commuters) and centrally located in San Diego.
It is a good location. And it much larger than it seems from the road. They can park 400 cars there and it won't even look overcrowded. But it is marked on Google Maps as an employee parking lot for the VA hospital in La Jolla. So, it may not be available to them.
Dug some more through permit records, found another site on Mercury Court, but that one looks like a SolarCity call center.