Well, it COULD BE Arizona. The Western Motel on El Camino Real in Santa Clara opened in 1948.  The Western sign, essentially a giant neon cactus, came about a decade later – in 1959.  An excellent example of mid-century roadside architecture, better catch it soon as the motel property has been slated for the development of condos and the sign, as I have been told, is going to a private collector.