During the 2018 field season we have carried out limited work aimed at clarifying aspects not only related to the architecture of the theatre, but also linked with the development of this sector of the town. Of special significance was the investigation of a sector of the postscaenium (immediately behind the valvae regiae), which has made it possible to better interpret some structures in travertine blocks (opus quadratum), already identified in 2018, which now appear to belong to an earlier building, demolished to make room for the theatre itself. These remains are made up of two linear parallel structures, abutting what look like the foundations of two pilasters: at the moment we therefore propose to interpret such structures as the remains of the foundations of a porticus, cut and largely removed during as a result of the building of the theatre. We also recorded the presence of six quarry marks, whose characteristics are compatible with a typology which is well-attested in central-southern Italy between the late 5th and early 2nd c. BC. Given that the ceramic materials found in association with these foundations are mostly dated to the 2nd c. BC, we tentatively propose to date this building to the earlier part of that century. Some rooms, originally part of the cavea’s substructures, have been further investigated, bringing to light a thick structure in opus caementicium, whose profile seems to follow the curve of the theatre itself. Even though its precise function is still being discussed, at the moment we are inclined to consider it an element aimed at strengthening the foundations of the theatre.