Burj Khalifa also known as Burj Dubai, is a supertall skyscraper in Dubai, United Arab Emirates, and is the tallest man-made structure ever built, at 828 m (2,717 ft). Construction began on 21 September 2004, with the exterior of the structure completed on 1 October 2009 and the building officially opened on 4 January 2010.
The building is part of the 2 km2 (0.8 sq mi) flagship development called Downtown Burj Khalifa at the "First Interchange" along Sheikh Zayed Road, near Dubai's main business district. The tower's architect and engineer is Skidmore, Owings and Merrill, LLP (Chicago).Bill Baker, the Chief Structural Engineer for the project, invented the buttressed core structural system in order to enable the tower to achieve such heights economically. 
Adrian Smith, who worked with Skidmore, Owings and Merrill (SOM) until 2006, was the Design Partner on the project. The primary builder is a joint venture of South Korean Samsung C&T, who also built the Taipei 101 and Petronas Twin Towers,Besix and Arabtec. Turner Construction Company was chosen as the construction project manager.Under UAE law, the Contractor and the Engineer of Record are jointly and severally liable for the performance of Burj Dubai. Therefore, by adoption of SOM’s design and by being appointed as Architect and Engineer of Record, Hyder Consulting is legally the Design Consultant for the tower.
The total budget for the Burj Khalifa project is about US $1.5 billion; and for the entire new "Downtown Dubai", US $20 billion.Mohamed Ali Alabbar, the CEO of Emaar Properties, speaking at the Council on Tall Buildings and Urban Habitat 8th World Congress, said that the price of office space at Burj Khalifa had reached US $4,000 per sq ft (over US $43,000 per m2) and that the Armani Residences, also in Burj Khalifa, were selling for US $3,500 per sq ft (over US $37,500 per m2).