There is room for one or two cars behind the Tesla store on 3rd street. There is a charger, but when I visited there was a Model S demo vehicle there. I would definitely recommend calling in advance, and not assuming you can charge there. Also it was not a High Powered Wall Charger, I think it was a NEMA 14-50 type plug. It is in the heart of Santa Monica, there must be many public charging stations nearby.