Archivio di Stato di Venezia

From the longer Italian Wikipedia page

State Archives of Venice is a research and conservation institute of MiBACT, located in the San Polo district and belonging to the former convent complex of Santa Maria Gloriosa dei Frari.

The State Archives of the city of Venice opened here in 1815, initially as the "General Archive", following the suppression, in the early nineteenth century (by Napoleonic edict), of the orders housed in the Frari convent. Therefore, all the ancient documents coming from the most prestigious archives of the Venetian palaces begin to gather in this structure, previously the site of the cells where the friars lived and adapted to the new needs by the work of Jacopo Chiodo.