1940s renovation. Hardenbergh, in designing the Central Park South foyer, had believed the lobby to be the most important space in the hotel, as did Warren and Wetmore when they designed the Fifth Avenue lobby. Furthermore, Warren and Wetmore had thought restaurants to be the second most significant space in a hotel, in designing the Terrace Room. There were originally laundry rooms in the basement and on floor 18. When the hotel opened in 1907, the basement also contained a grill room, kitchen, various refrigeration rooms, and amenities such as a Turkish bath and a barber shop. Originally concealed within the mansard roof were the housekeepers' quarters and maids' dormitories; the eighteenth floor had carpentry, ironing, and tailors' departments. The spaces on floor 18 had become offices by the late 20th century. Hallways and lobbies In Hardenbergh's original design, a main corridor connects the primary spaces on the ground floor. The corridor, which still exists, connects the lobbies on 58th Street, Grand Army Plaza, and Central Park South. The layout of the ground-floor hallways dates largely from the 1921 expansion by Warren and Wetmore. The corridor wraps around the south, east, and north sides of the Palm Court, which is in the center of the ground floor. Various smaller corridors lead off the main corridor. All of the halls have floors decorated with mosaics, coffered ceilings made of plaster, and marble columns and pilasters with bronze capitals. The Central Park South entrance foyer served as the original main lobby, and is in the shape of a "U", with an overhanging mezzanine. It contains veined Italian-marble finishes, gold-colored trimmings, a mosaic floor, a plaster coffered ceiling, and columns similar to those in the main corridor. There is a bank of four elevators, with decorative bronze doors, directly in front of the entrance. A crystal chandelier hangs from the ceiling. The entrance doorways contain bronze frames with lunettes. The original design had the branch offices of major brokerage houses adjoining the foyer, including in the modern-day Oak Bar. During Warren and Wetmore's expansion, the Grand Army Plaza lobby, also called the Fifth Avenue lobby, was created as the hotel's new main lobby, which occupied the former Plaza Restaurant's space. The lobby contains a "U"-shaped mezzanine running above the northern, eastern, and southern walls, with three entrance vestibules below the eastern section of the mezzanine. The Fifth Avenue lobby was decorated with bas-reliefs;