Trump announced in 2001 that the skyscraper would become the tallest building in the world, but after the September 11 attacks that same year, the architects scaled back the building's plans, and its design underwent several revisions. When topped out in 2009, it became the second-tallest building in the U.S. It surpassed the city's John Hancock Center as the building with the highest residence (apartment or condo) in the world, and briefly held this title until the completion of the Burj Khalifa.