The archival material was then housed in the former Jesuit church of St. Teresa located in the Marina district, where it had been transferred in 1883, after a centuries-old and almost uninterrupted stay in the royal palace located in the Castle of Cagliari. Putting aside the idea of renovating the old church because it was absolutely unsuitable, the decision was made to build a new archive in the area between the current via Gallura and via Sonnino. In 1921 the construction project was approved, which provided for two floors.
The work was started quickly and during construction the raising of another two floors was allowed for the temporary use of the offices of the Civil Engineering. On October 30, 1927, the new headquarters was inaugurated. The building, designed according to the standards of good preservation of archival material, represented one of the first and appreciated examples of post-unification archival construction in those years.
Stylistically responding to the canons of eclectic architecture, it is still arranged on four floors separated in pairs by a stringcourse; it is enriched by rusticated and roughly hewn pilasters framing windows with curved pediments on the first floor and triangular ones on the second.
Above the entrance door stands a broken curved pediment resting on two pilasters. The State Archive of Cagliari has an ancient history, connected to the role that the city played as capital of the Regnum Sardiniae (1323-1847) passing through the Catalan-Aragonese (14th-15th centuries); Spanish (16th-18th centuries) and Piedmontese (18th-19th) dominations, etc.).
