Starting from the ground up an aeration cavity was formed to limit the ingress of humidity and allow for services. The building is in a seismic zone, so every floor had to either have a series of ties holding the perimeter of the walls or have a reinforced concrete ring beam.

The walls cavities were filled with ancient mice nests and acorns, so were washed out and reinforced by injection. The floors of the public areas were rebuilt with the limited amount of salvaged material, whilst the rooms used reinforced concrete.