The SU is a red tufo block belonging to an early phase of the Area C house. The red tufo is similar to truncated walls such as 2239, 2245,and 2378. It is possibly a north-south running wall delimiting some space within the early house. During post-excavation study, this feature was reinterpreted as a wall foundation to the north of Space 1 in Phase 1B. It marks a potential western limit for the building plot.