This was a huge warehouse for grain. It has been dated to the reign of Commodus, Emperor of the Antonine dynasty. Only the south-east part has been excavated completely, but after the excavation it was covered with earth again. Around a courtyard runs a portico. The main entrance was in the north part, from the Tiber quays. Strong buttresses reinforced the south wall. To the east is a row of rooms, back-to-back (a lay-out that is often found in Portus). The floors of these rooms are raised, pointing to the storage of grain. One of the rooms contains a mediaeval lime-kiln.

The building is in many respects similar to the Commodan phase of the Great Warehouse (II,IX,7). There can be little doubt that it was owned by the Emperor.

Plan of the warehouse. After SO I.