 Under the advice of Fazlur Khan, a structural engineer from Skidmore, Owings and Merrill (SOM), the design revolves around four basic components in order to reinvent the tower as a ‘cantilever’ and achieve the properties of a ‘giant stiff structural tube’.The four components consist of a steel-framed flooring system, a steel-framed central core, a steel and glass façade, and steel trusses that connect the central core to the façade.Innovative techniques were employed to lay the foundations of the building – a concrete raft which was poured in a single continuous action.