The Apartment is a 1960 American romantic comedy film produced and directed by Billy Wilder from a screenplay he co-wrote with I. A. L. Diamond, starring Jack Lemmon and Shirley MacLaine, alongside Fred MacMurray, Ray Walston, Jack Kruschen, David Lewis, Willard Waterman, David White, Hope Holiday, and Edie Adams.
C.C. "Bud" Baxter is a lonely office drudge at a national insurance corporation in a high-rise building in New York City. In order to climb the corporate ladder, Bud allows four company managers to take turns borrowing his Upper West Side apartment for their various extramarital liaisons, which are so noisy that his neighbors assume that Bud is a playboy bringing home a different woman every night.