This project concerns the renovation of Tergesteo Palace, located in Trieste historic centre. The complex was first designed by the architect Buttazzoni, and subsequently re-elaborated by Brujn. It was realized between 1840 and 1842, and is composed of four squares gathered around a cross-shaped glass gallery. The original roofing dated back to the mid-19th century, based on the design of the Milanese architect Pizzala, whose experience working on the De Cristoforis gallery in Milan served as a prototype for the construction of Tergesteo Palace. In 1957 the steel and glass roofing was demolished and replaced with a lower vault in glass brick, designed by the architect Psacaropulo. This in turn was later removed and substituted with a steel and glass construction based on the original 19th century design, which stands today as part of in the gallery’s current renovation as prescribed by the Superintendancy. The Ottostumm | Mogs system employed for this noteworthy construction is a structure made of galvanized steel, particularly suited for use in inclined roofing and vertical facades.