After decontaminating the building, the team started by dismantling everything that was not structural. Then, they implemented the shell. Since the building lies on alluvial soil, a system of piles and micropiles was used to reinforce the existing foundations. Then the demolitions and reconstructions were performed successively. Temporary structures were used to reinforce the stability of the existing building, as the colossal structure sits on six concrete stilts. Part of the old façade was preserved, incorporated as an interior wall into the new envelope. This link between the old and the new required multiple underpinnings with chemical seals.
In terms of finishing, the slates of the envelope were made of terracotta with local inspiration. Solar panels cover the roof and one of the façades. In an innovative touch, the building cap reflects what is happening on the terrace and on the floor. Inside, the museum's rooms are fitted with ventilation designed to preserve works, as well as a clay coating to regulate the humidity.