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In page The Apartment:

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The initial concept was inspired by Brief Encounter by Noël Coward, in which Laura Jesson (Celia Johnson) meets Alec Harvey (Trevor Howard) for a thwarted tryst in his friend's apartment. However, Wilder was unable to make a film about adultery in the 1940s due to Hays Code restrictions. Wilder and Diamond also based the film partially on a Hollywood scandal in which agent Jennings Lang was shot by producer Walter Wanger for having an affair with Wanger's wife, actress Joan Bennett; during the affair, Lang had used a low-level employee's apartment for trysts.[1] Another element of the plot was based on the experience of one of Diamond's friends, who returned home after breaking up with his girlfriend to find that she had committed suicide in his bed.[citation needed]