side. The tower's main entrance is on the western elevation of the tower's base and is flanked by projecting vertical piers (see ). Seven arched niches, each containing one statue of a king, are above the main entrance. A large rose window is above the statuary grouping. The apex of the tower is fitted with aircraft warning lights. Above the tenth floor are five tiers of window arrangements on each floor; the higher tiers become progressively narrower. From bottom to top, the successive tiers have two, three, four, and five windows on each side. There are narrow, canopied niches in each corner of the tower, with one statue inside each niche. At the top of the tower is a conical metal roof. Tower stories Most of the tower's stories have plaster floors, steel doors, steel window frames, and iron lighting fixtures hanging from each ceiling. There are elevator lobbies with vaulted ceilings on several stories of the tower. On the stories that contain common spaces, including the ninth and tenth floors, the floors are finished with stone, terrazzo, and wood, and are fitted with wooden doors. Several spaces in the tower have been used by outside entities, who carpeted floors and installed lighting fixtures in some office rooms. Originally, the fourth through fourteenth floors were occupied by Riverside Church's school while the fifteenth floor and above contained staff and clergy offices, as well as spaces for group activities. The second floor connects to the nave's lower seating gallery, while the third floor leads to the upper seating gallery. The fourth through eighth floors are below the height of the nave's ceiling; these housed the nursery, junior high, and high school departments of the church's school. The ninth and tenth floors housed the double-story school kitchen, school offices, and storage rooms over the nave. The ninth floor also houses a library, and there is wooden furniture in the kitchen and library. The main structure's roof is above the tenth floor, and the tower rises independently above that point. The eleventh through fourteenth floors originally contained the church's elementary school while the fifteenth and sixteenth floors respectively housed the young people's meeting room and the social room. These floors were later converted into office space, and several floors were subdivided and leased out. The seventeenth through twentieth floors include meeting rooms and the seventeenth floor also contains offices. The twenty-first floor includes