Apartment, The

Billy Wilder, 1960.

Jack Lemmon plays C.C.Baxter, an office clerk, who offers his apartment to senior executives to facilitate their affairs and infidelities, in exchange for his promotion. Baxter falls for elevator operator Fran, only to discover she is the mistress of his boss, a frequenter of the apartment. Although the film is initially light-hearted, it rapidly grows darker, striking an uneasy balance between tragedy and comedy.