Principal photography began on June 11, 1984 and lasted a total of 32 days, in and around Los Angeles, California. The high school the protagonists attend was filmed at John Marshall High School, where many other productions such as "Grease" and "Pretty in Pink" have been filmed. The fictional street address of Nancy's house in the film is 1428 Elm Street; in real life this house is a private home located in Los Angeles at 1428 North Genesee Avenue.</ref> The Lantz' family home was at 1419 North Genesee Avenue on the other side of the road. The boiler room scenes and police station interior were shot in the Lincoln Heights Jail (closed since 1965) building, while the exterior used for the police station was Cahuenga Branch Library. The American Jewish University on 15600 Mulholland Drive was used for the "Katja Institute for the Study of Sleep Disorders" visited by Marge and Nancy.