"The Magnificent Ambersons" was in production October 28, 1941 – January 22, 1942, at RKO's Gower Street studios in Los Angeles. The set for the Amberson mansion was constructed like a real house, but it had walls that could be rolled back, raised, or lowered to allow the camera to appear to pass through them in a continuous take. RKO later used many of the film's sets for its low-budget films, including a series of horror films produced by Val Lewton.