I like the above photo Riichkay.
H & H Enterprises, Inc.,
3401 W. Washington Blvd, L. A., Phone
REpublic 5-9311 - August 1957 (link below)
The beautiful black Cadillac parked beneath the 'PA' in PAINTING appears to be a 1954 Cadillac Deville or Series 62.
The Cadillac in the foreground is an enigma. It appears to have a modified 1956 front end, 1957 rear tail fins and 1958 double headlights.
Custom Craft Upholsterers, Inc., now occupies a large two-story masonry building at that location, circa 2009. The building next door (3415 W. Washington Blvd) is a survivor. Compare its architectural features, especially the unusual roof line to the May 2009 Google Street View (Google Maps link below) for confirmation.
https://www.google.com/maps/@34.0399...5410&entry=ttu
https://www.loc.gov/resource/usteled...,0.455,0.225,0