Ole Scheeren of OMA architects designed the building, Cecil Balmond and Arup provided engineering. It stands at 234 metres (768 ft) tall and has 44 floors. 75 Elevators. Designed as a reinvention of the skyscraper as a loop, construction on the building began in 2004 it opened in 2012 : additional credits, David Gianotten,Shohei Shigematsu, Ellen van Loon, Victor van der Chijs,Yao Dongmei,Anu Leinonen, Charles Berman, Adrianne Fisher,