Warner Bros set trivia
The wonderful staircase at Doris's mansion is a standing set used in many other Warners movies and TV shows from 1948 to the early 1960s
Here's an approximate list with dates.
1948 Bright Leaf Bacall's Southern Plantation
1950 Tea for Two Doris Day's Long Island mansion
1951 Strangers on a Train Leo G Carrol's Washington Mansion
1953 So Big Mansion of possible father in law
1957 Band of Angeles Clark Gable's southern plantation
1957 Spirit of St Louis Hotel lobby before Lindburgh takes off
1958 Auntie Mame Mame's Beekman Place home, reset many times
1959 A Summer Place Fancy school attended by Sandra Dee
1960 Ocean's Eleven Ilka Chase's fancy mansion
1961 Parrish Karl Malden's mansion
1962 Rome Adventure Rossano Brassi's Rome apartment
Any other sightings, let me know.
Richard