The Dubai City Tower, also known as the Dubai Vertical City, is a proposed megatall skyscraper announced in 2008. The building is supposed to be 2,400 metres (7,900 ft) tall. The building, created by an architect to display possibly future technologies, is the fourth tallest building ever fully envisioned after the Tokyo Tower of Babel (10,000 m), the X-Seed 4000 (4,000 m) and the Ultima Tower (3,218 m). If ever constructed, the Dubai City Tower will be much taller than any other current man-made structure, at almost three times the height of the Burj Khalifa. The Dubai City Tower would be almost seven times taller than the Empire State Building.