The tower features three separate observation decks which constitute the floors above and below the aperture opening. The height of the lowest observation deck, located on the 94th floor, is 423 m (1,388 ft); the second, on the 97th floor, is at a height of 439 m (1,440 ft); and the highest, on the 100th floor, is 474 m (1,555 ft) high.