When a million dollars was stolen from the middle of a Las Vegas casino in plain view, insurance investigator Thomas Banacek was called in to take over the case. We never learned the name of the casino, only that it was owned by reclusive billionaire Jonathan Jackson (a Howard Hughes type).
So I'm going to claim that the casino would later become known as the Montecito, once it was sold after the death of Jackson. O'Bviously there was forty years of renovation to turn it into the sleek casino seen in the later TV show.
'Banacek' - "A Million The Hard Way"