The Apartment (1960) | Official Trailer | MGM Studios

Ambitious insurance clerk C.C. "Bud" Baxter (Jack Lemmon) attempts to climb the corporate ladder by loaning his apartment key to his superiors for their extramarital affairs, but the plan backfires when Bud unwittingly falls for the top executive's current girlfriend, Fran Kubelik (Shirley MacLaine). Fred MacMurray co-stars in this Billy Wilder classic that would go on to win five Academy Awards® including Best Picture, Best Director and Best Original Screenplay.