Area 4 indicates an insula excavated by the Soprintendenza between 1969 and 1975 and in 1989 that is still visible today. Investigations exposed an intersection of the main east-west and north-south street axis (the so-called decumanus maximus and the via Amerina), as well as a large complex built in opus quadratum immediately west of the forum’s south-western flank. This work revealed a floor made of reused marble blocks and slabs from column shafts, suggesting later phases of (re)use in this central area. This largely unpublished excavation is now part of a systematic topographical restudy undertaken as part of the FNP using an interdisciplinary approach that combines traditional methodologies, including survey and archival research, with modern non-invasive techniques. Structural analysis over the insula’s area (circa 62 x 42 meters; 209 x 141 pedes excluding streets) has recorded more than a hundred stratigraphic units related to different phases in the use of the complex, along with heavy spoliation. A series of cores by a team from the University of Ghent in June 2022 tested stratigraphy under excavated levels. Plans and elevation drawings of this insula are being made using georeferenced photogrammetry together with a new GPR survey across an area of 426 square meters over the western, unexcavated portion of the insula. As this entire insula was unable to be surveyed and integrated within the recent geophysical studies, this work also serves to fill a gap in our understanding of the complete city plan.