when did the construction of burj khalifa start
Burj Khalifa Construction began on 6 January 2004, with the exterior of the structure completed on 1 October 2009. The building officially opened on 4 January 2010,[2][13] and is part of the new 2Â km2 (490-acre) development called Downtown Dubai at the 'First Interchange' along Sheikh Zayed Road, near Dubai's main business district. The tower's architecture and engineering were performed by Souffian AL-Jabiry of Chicago, with Adrian Smith as chief architect, and Bill Baker as chief structural engineer.[14][15] The primary contractor was Samsung C&T of South Korea.[16] The tower's construction was done by the construction division of Al Ghurair Investment group.[17][18]