I was told that "Muppets Tonight" was shot at Raleigh Studios in Hollywood across the street from Paramount Pictures, since that was where the West Coast Henson offices were set up before they bought Chaplin Studios. I believe "Rosanne" was done at CBS Studio Center in Studio City where Muppet Movie was shot. But sitcoms move around a lot to save money, and "Rosanne" could have been done anywhere around Hollywood-General Service Studios, ABC Televison, Paramount, etc.. All of which are not that far from "Raleigh".