Most of the film took place inside of the bank. Lumet discarded the idea of building a studio set; instead, the director found a street with a warehouse on the lower floor of a building that used to be an automotive workshop. The crew built a bank set with movable walls, which allowed Lumet to place the cameras as he desired, and to use long lenses to shoot from a distance. The warehouse's location also allowed Lumet to transition freely between the bank and the street, and he avoided changing film locations, and allowed the street to be visible from the inside of the bank. The scenes were shot on the west side of Prospect Park, between 17th and 18th streets. The bus line that ran through the street was re-routed for filming, and the second story of the building housed the production offices and catering.