I believe this used car dealership may have been over on the west side of L.A., near Marina Del Rey, based on the address. In the 60's and 70's there were a lot of used car dealers over in Inglewood, on Hawthorne Bl. One of the big ones was Wagon City. Went there a few times to browse... Can't find a single picture of it.
Also interesting top treatment on that Firebird. Was that Landau type top available from the factory, or a full vinyl, like the Camaro?