Il materiale archivistico was then hosted in the former Jesuit church of S. 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 refurbishing the old church because it was absolutely unsuitable, it was decided 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 the work it was allowed to add two more floors for the temporary use of the Civil Engineering offices. On October 30, 1927, the new headquarters was inaugurated. The building, designed according to the rules of good preservation of archival material, represented in those years one of the first and appreciated examples of post-unification archival construction.
Stylistically consistent with the canons of eclectic architecture, it still today presents itself articulated over four floors separated in pairs by a string course; it is enriched by rough and roughly hewn rusticated pilasters framing windows with curved pediments on the first floor and triangular ones on the second.
Above the entrance door stands out 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 the capital of the Regnum Sardiniae (1323-1847) passing through the Catalan-Aragonese (14th-15th centuries); Spanish (16th-18th centuries) and Piedmontese (18th-19th centuries) dominations, etc.).
