At 828 m (2,717 ft), it is the tallest building in the world and the tallest man-made structure ever built. Construction began on 21 September 2004, and was completed and ready for occupancy by 4 January 2010. Burj Khalifa is estimated to have cost US$1.5 billion.[4] In addition to being the tallest building in the world, Burj Khalifa holds six other world records, including ‘tallest free-standing structure in the world’, ‘elevator with the longest running distance in the world’ and ‘highest number of stories in the world[5]’.