Burj Khalifa - formerly known as Burj Dubai- inaugurated by Vice-President and Prime Minister of the UAE , His Highness Shaikh Mohamed

Burj Khalifa (Arabic: برج خليفة‎ "Khalifa Tower"), formerly known as Burj Dubai, is a skyscraper in Dubai, United Arab Emirates, and 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. The building officially opened on 4 January 2010. The building is part of the 2 km2 (490-acre) flagship development called Downtown Burj Khalifa at the "First Interchange" along Sheikh Zayed Road, near Dubai's main business district.
The tower's architecture and engineering was performed by Skidmore, Owings, and Merrill of Chicago. Adrian Smith, who worked with Skidmore, Owings and Merrill until 2006, was the chief architect and Bill Baker was the chief structural engineer for the project. The primary contractor was Samsung C&T of South Korea, who also built the Taipei 101 and Petronas Twin Towers. Major subcontractors included Belgian group Besix and Arabtec from the UAE. 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 Khalifa. Therefore, by adoption of SOM's design and by being appointed as Architect and Engineer of Record, Hyder Consulting was legally the Design Consultant for the tower.

Current records

Tallest skyscraper to top of spire: 828 m (2,717 ft) (previously Taipei 101 – 509.2 m (1,671 ft))

Tallest structure ever built: 828 m (2,717 ft) (previously Warsaw radio mast – 646.38 m (2,121 ft))

Tallest extant structure: 828 m (2,717 ft) (previously KVLY-TV mast – 628.8 m (2,063 ft))

Tallest freestanding structure: 828 m (2,717 ft) (previously CN Tower – 553.3 m (1,815 ft))

Building with most floors: 160 (previously Willis Tower – 108)World's highest elevator installation World's fastest elevators at speed of 64 km/h (40 mph) or 18 m/s (59 ft/s) (previously Taipei 101 – 16.83 m/s)

Highest vertical concrete pumping (for a building): 606 m (1,988 ft)[19] (previously Taipei 101 – 449.2 m (1,474 ft))

Highest vertical concrete pumping (for any construction): 606 m (1,988 ft) (previously Riva del Garda Hydroelectric Power Plant – 532 m (1,745 ft)[20]) The first world's tallest structure in history to include residential spaceHighest outdoor observation deck in the world (124th floor) World's highest mosque (located on the 154th floor)World's highest installation of an aluminium and glass façade, at a height of 512 m (1,680 ft) World's highest swimming pool (76th floor)