The commercial complex was built at the end of the 1st century BC, probably in connection with the river port to its north. During the first phase, it consisted of a rectangular building in opus quasi reticulatum surrounded by a portico with tufa pillars (A). Also connected to the warehouses was the Caseggiato del Cane Monnus (B), which had tabernae (shops) opening onto a portico.
In the Imperial period, the warehouses underwent a series of radical alterations, the most important of which was the transformation of their northern part into the Terme dei Cisiarii; the original internal level, lower than that of the surrounding buildings, probably remained unchanged.
