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The Burj Khalifa (Arabic: "Khalifa Tower), known as the Burj Dubai before its inauguration, is a megatall skyscraper in Dubai, United Arab Emirates. It is the tallest structure in the world, standing at 829.8 m Construction of the Burj Khalifa began in 2004, with the exterior completed 5 years later in 2009. The primary structure is reinforced concrete. The building was opened in 2010 as part of a new development called Downtown Dubai. Architectural style: Neo-futurism Location: 1 Sheikh Mohammed bin Rashid Boulevard, Dubai, United Arab Emirates Coordinates: 25°11′49.7″N 55°16′26.8″ECoordinates: 25°11′49.7″N 55°16′26.8″E Construction started: 6 January 2004 Completed: 31 December 2009 Opened: 4 January 2010 Cost: USD $ 1.5 billion Height Architectural: 828 m (2,717 ft) Tip: 830.8 m (2,726 ft) Roof: 828 m (2,717 ft) Top floor: 584.5 m (1,918 ft) (Level 154) Observatory: 555.7 m (1,823 ft) (Level 148) Technical details Material: glass, steel, aluminium, reinforced concrete Floor count: 154 usable floors plus 9 maintenance levels, 46 spire levels,[6] and 2 below-ground parking levels Floor area: 309,473 m2 (3,331,100 sq ft) Lifts/elevators: 57 (55 single deck and 2 double deck), made by Otis Elevator Company