On 14 September 2007, the skyscraper was topped out at 492.0 meters (1,614.2 ft), making it, at the time, the second-tallest building in the world and the tallest structure in Mainland China. It also had the highest occupied floor and the highest height to roof, two categories used to determine the title of "world’s tallest building". The SWFC opened to the public on 28 August 2008, with its observation opening on 30 August. This observation deck, the world's tallest at the time of its completion, offers views from 474 m (1,555 ft) above ground level.