Martifer's intervention consists of the execution of the entire exterior envelope of the building, from the second floor to the roof. With a total area of 24,300 sqm, the works include the production and assembly of: 12,550 sqm of unitised façade of which 7,800 sqm with GRC (Glass Fiber Reinforced Concrete) cladding, 2,160 sqm of window frames and 6,200 sqm of lacquered aluminium sheet coatings for the balconies (walls and ceilings), 4,350 sqm of SFS ((Secondary Frame System), 1,850 sqm of waterproofing / pavements on the balconies. For the roof, the works consist of 1,295 sqm of waterproofing / floorings and the production and assembly of 223 sqm of Z shaped aluminium grids.