The Apartment (1960)

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Wikipedia - "The Apartment is a 1960 American comedy-drama film produced and directed by Billy Wilder, which stars Jack Lemmon, Shirley MacLaine, and Fred MacMurray. ... Calvin Clifford (C. C.) 'Bud' Baxter (Jack Lemmon) 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, Baxter allows four company managers, who reinforce their position over him by regularly calling him 'Buddy Boy', to take turns borrowing his Upper West Side apartment for their various extramarital liaisons, which are so noisy that his neighbors assume that he is bringing home different women every night. The four managers (Ray Walston, David Lewis, Willard Waterman, and David White) write glowing reports about Baxter, who hopes for a promotion from the personnel director, Jeff Sheldrake (Fred MacMurray)."
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Roger Ebert
THE APARTMENT by Billy Wilder and I.A.L. Diamond
YouTube: The Apartment - Trailer, Office Party Scene