The restrained modern glass and steel structure holding auxiliary space for Orchestra Hall is compatible, even subservient, to the historic building. The atrium soars four stories comprising a lobby with a bar, cozy seating areas, and a grand stairway and balconies. Its second- and third-level window overlooks Woodward Avenue. The Music Box is a flexible 450-seat recital hall with adjustable walls in the heart of the building. Other spaces are a gift shop, administration wing, rehearsal center, donor lounge, cafe, and musicians' rooms.