Cantilever slabs at different heights are joined by stairs hidden between the cover’s metal side, in addition to the elevators with panoramic views of the city. The cover or ‘pen’ is the most spectacular structure with 230 meters long and more than 70 meters height while the two ‘shells’, which embrace the buildings, are constructed of steel sheet with an approximate weight of 3,000 tons lined by the outer ceramic coating. The maximum dimensions of the building envelopes are up 163 meters long and 87 meters wide.