In the basement, the walls of the old building on the parcel were kept. In order to ensure the temporary maintenance of these walls, they were nailed in place so as not to clutter up the pit with struts to facilitate the phasing of the site.
The structure, in order to meet a very tight schedule, is mainly prefabricated. Thus, in the basement, only the foundation slab and the walls of the -3 are made of cast-in-place concrete.
The rest of the concrete elements are entirely or partially precast. The car park and ground floor slabs are hollow core concrete slabs laid on prefabricated concrete beams. The ramp is a pre-slab, while all the walls are made of prefabricated concrete twin-walls. At the superstructure level, there is a main concrete core and a secondary core in CLT. The common walls and facade walls are also made of CLT. The rest of the structure is a glulam column and beam structure. The floors with a span of up to 6.3 m are made of CLT 220-7ss in particular to guarantee the R120 criterion.