Wall built of regularly worked large tufo blocks, though of slightly different dimensions than typical ashlar walls of the mid-Republican period found in buildings elsewhere in the city (e.g. walls 7108/7204 to the south in Area H, or the walls of the Area F complex). Though later used as the foundation for a concrete wall (6056), it most likely belongs to an earlier phase. At the moment, without further excavation in the block to the east, it remains unclear whether its primary function was to delimit the side street or it belongs to some structure occupying the unexcavated portion of the block to the east (west of the Area I building). The construction technique is slightly unusual, with the upper course consisting mostly of headers laid on top of stretchers. That these headers (and the upper course generally) are less well preserved than the stretchers of the lower course may be the result either of their exposure to wear from the use of the road and general weathering, or because this wall actually consists of two phases: 1) the lowest course of stretchers, which is stepped gradually down the slope; and 2) the (possibly reused and poorly preserved) headers and stretchers of the upper course, added later (possibly shortly before or at the same time as the concrete wall 6056).