The structural system is made of walls, columns and reinforced concrete beams. The role of the pillars is to take over and transmit to the foundations the gravitational loads that fall to them, the horizontal forces being taken over almost entirely by the walls. The vertical structure of reinforced concrete walls is composed of two 50cm thick marginal walls arranged approximately in the middle of the openings and a central tube with 30cm thick walls. The vertical elements in the superstructure continue in the two levels of infrastructure. Additional basement walls are provided to increase the overall rigidity of the infrastructure, which must remain within the elastic range of seismic action.