The construction of the building was closely related to the preservation of the façade walls, deemed as historical monument, and, thus, of the foundations thereof, as well as to the affixing of such façade to the new building. With a view to ensure the strength and stability of the existing walls throughout the performance of works, until the attachment of the new building, and in order for the interior walls to be demolished, the creation of a temporary structure was required, namely of a metallic triangulation station. Above the upper level of the monument, the new building was expanded in the form of a cantilever having a maximum size of 3 m. Both the slabs and the cantilevers are made of a 22-cm reinforced concrete flat slab. The last basement was executed at a 4m-depth below the ruin's foundations.