upper portion of the western facade; the seventh-floor windows are flush with the buttresses while the windows below are in recessed arched bays. The southern facade contains eight window bays, six of which are recessed. There are no windows into the first and second floors on the westernmost four bays of the southern facade but the eastern four bays do have windows into these floors. On the far eastern portion of the southern facade are two pointed-arched openings that lead to the church's underground parking garage (see ). The eastern facade is separated into two sections; the section at the end of the wing's short arm contains four recessed window bays. The section next to the north–south axis of the "L" contains six window bays, four of which are recessed. Interior The northern arm of the MLK Wing's first floor includes the South Hall Lobby, which has a two-story-high coffered ceiling that is supported by a pointed-arch arcade and its walls are made of gray plaster. To the south of the lobby lie an elevator bank and an auditorium called the South Hall. The South Hall's walls are made of wood paneling below limestone and it has nine stained-glass lancet windows on the western side. To the east of the auditorium are two mezzanine levels that lie below the South Hall's ceiling, while a sealed tunnel leading to the Interchurch Center across 120th Street is also accessible from the auditorium. The third-to-seventh floors include classrooms, except for the fifth floor, which contains offices. The hallway floors are made of terrazzo and individual rooms have resilient flooring, except for the fifth floor rooms, which contain carpeted rooms, and each level has dropped ceilings. Chapels for children are on the third floor's southwestern corner and on the sixth floor's southern side. The roof contains a solarium and a play area. Stone Gym The Stone Gymnasium is a -story English Gothic building at 120th Street and Claremont Avenue, east of the Martin Luther King Jr. Wing. The gym was built in 1912 to a design by Louis E. Jallade and was originally used by the Union Theological Seminary. Its architectural details include a facade of schist with limestone decoration and a metal hip roof. The structure measures five bays long on the eastern facade and one bay wide on the southern and northern facades. In 1957, Rockefeller donated the building to the church