In March 2000, during work for a water conduit of the EAF in the area of Settimo San Pietro, at the foot of the southern slope of the hill of Cuccuru Nuraxi, just behind the railway line between Cagliari and Mandas, stratigraphic archaeological excavation was undertaken. The walls uncovered all belong to a single building, although only the foundations remained. These were built with rocks of medium size, apparently without any type of mortar and characterized by the use for chinking of numerous fragments of roof tiles, of the type with rims whose sections were triangular or trapezoidal. The earliest pottery dates from the site to the Hellenistic period, and includes small amphorae and unguentaria. These were found almost intact outside the building in an area belonging to a necropolis which preexisted the its construction. Probably in the late Imperial period the area of the cemetery was disturbed by the construction of this large building with separate rooms, whose use is still unknown. The remains of mud brick in pinkish clay in some rooms may support the idea that the structure was constructed of mud brick resting on a socle of rock. A confirmation of this may be the fact that the stone destruction layers were very thin. In regards to the dating of the building, the _terminus post quem_ is provided by the roof tiles and by the pottery used to chink the wall, while the _terminus ante quem_ is given by the absence, in the entire are, of materials later than the late Antique period. The dating of the buiding may be placed, therefore, in a chronological arc between the Imperial period and Late Antiquity.