The tallest building is the Burj Khalifa (Khalifa Tower) which measures 828 m (2,716 ft 6 in) tall.
Construction began on 21 September 2004, with the exterior of the structure completed on 1 October 2009. The building officially opened on 4 January 2010, and is part of the new 2 km2 (490-acre) flagship development called Downtown Dubai at the 'First Interchange' along Sheikh Zayed Road, near Dubai's main business district.
It was developed by Emaar Properties and the architects Skidmore, Owings & Merrill LLP. The total built-up area is 5,766,388 sq.ft and total usable area is 4,233,488 sq,ft. The Burj Khalifa (Arabic: ÈÑÌ ÎáíÝÉý "Khalifa Tower") was known as 'Burj Dubai' prior to its inauguration.