where was poltergeist filmed

The movie "Poltergeist" was primarily filmed in Southern California, with key locations including the Freeling family house at 4267 Roxbury Street in the Forest Hills estate of Simi Valley, California. Other filming sites were in Agoura Hills, California, and the University of California, Irvine. Additional scenes were shot at the Ontario Airport Inn (formerly a Holiday Inn) in Ontario, California. The production blended real neighborhood locations with studio sets for interior scenes.