Commissioned by Town Hall, the Majorcan firm Aulets has carried out a sensitive project that respects  preexisting elements while giving an optimal solution to a basic structural problem: the excess weight caused by thousands of metallic filing cabinets resting on the floor slabs. The site is a plot between party walls located right in the center of town, on which the passage of time has deposited residues of urban growth. These elements have been integrated into the design as part of the material history of the building and the city.
In order to make the most of the space and building materials provided, the structure has been layout as a sequence of concrete vaults able to withstand all the loads with thinner slabs.

The building has two floors. The lower one gives access to the whole building and houses the reception, toilet, storage, archives and a consultation room opened to a small courtyard. The upper floor contains more archives and another consultation room.