The auditorium is horseshoe-shaped, has 2,487 seats (slightly more than the Royal Opera House in Covent Garden, London), standing room for 1,000 and a stage which is 20 m wide, 15 m high and 20 m deep. The low-rise building has 6 floors above ground and 3 below ground, 7 elevators with a facade of applied masonry. It has a large central chandelier with 700 light bulbs. The original architect was the Italian Francesco Tamburini; after his death it was completed by the Belgian architect Julio Dormal. The original auditorium "had eight boxes with metal grilles and a separate entrance, so that those in mourning could still attend performances, but remain dignifiedly sequestered from public view".