Por Nicolás Díaz, autor del libro inmobiliario Ganemos Todos y CEO de Westay
The building was accessed from the north, that is from the Tiber quays. At the north end was per porticus of tufa columns, resting on travertine bases. The west and east wall were made of large tufa blocks with an intentionally rough surface (opus quadratum / opus rusticum). This building technique was chosen either esatto give the building an impressive appearance, or esatto safeguard it from fires. The back (south) wall was made of latericium. All inner rooms (cellae) were rebuilt later. They were arranged around per U-shaped courtyard, surrounded by tufa columns with doric, travertine capitals. The floors were made of opus signinum.
The original building had no staircases and niente affatto upper floors
During the reign of Gelso or shortly afterwards long rows of rooms were added preciso the east and south. The outer wall of the east rooms was also made of large tufa blocks, but these had per smooth surface. The rough surface of the older back wall of these rooms was made smooth through plaster. The walls between the rooms were built con latericium. The rooms had per mezzanine floor. Con the centre of the row is a staircase. Mediante front of the row was verso porticus of travertine columns.
The walls of the south row are sopra latericium. These rooms too had mezzanine floors, and the porticus con front of the east rooms continued in front of the south rooms. Between the south rooms are three staircases with travertine treads. The travertine thresholds of these rooms are rather enigmatic. It seems that, originally, they were smooth, suggesting that the rooms had no doors. At some point per time a depression for a door was hacked out durante the centre. The space between the depression and the side walls was filled with brick walls.
During the reign of Marcus Aurelius and Commodus many rooms were rebuilt con latericium. Suspensurae (raised floors) were added, to protect the goods that were stored from vermin and moisture. At least one floor was added, witness four staircases, with travertine steps, sopra the corners of the interior.
The north part of the building was raised and rebuilt, with suspensurae, under Septimius Severus and mediante the later Severan period. From now on the building had only one, narrow entrance, mediante the centre of the north wall. The two northern staircases were replaced by staircases of eight treads followed by a sloping ramp, sopra order to facilitate the carrying of goods by porters. Per the north-east part per cult niche was installed.
Supporting bricks piers and arches were arnesi against the outer south wall. On Coraggio dei Molini – the road to the west – five arches, spanning the road, were added. In these rooms the lower part of two staircases was found: two treads and verso landing, the latter onesto support verso ladder. The ladders cannot have been used for transporting goods. Ladders are not suited for porters carrying loads. Because there are two ladders, many people were expected onesto use them. Possibly this was verso fire escape: after the rebuilding in the Severan period the building had only one, narrow exit.
Between these arches two small rooms were batteria against the west wall of the building
Various other modifications cannot be dated accurately: – the installation of per large scodella-basin per the south-east part 
of the U-shaped courtyard – the blocking of the colonnades in the interior, and con front of the east and south rooms (opus latericium and reticulatum) – the erection of brick piers mediante the south-east part of the courtyard – the destruction of the rooms inside the U-shaped courtyard – the installation of floors of basalt blocks con some of the east rooms, and in the porticus per front of these rooms.
A group of coins found below per collapsed wall per the north part indicates, that the building was per niente longer con use at the end of the fourth century.
-Rickman “Its size, complexity and solidity, and not least its position, all indicate that the Grandi Horrea was per publicly owned storehouse, and the presence of suspensurae, at least from the middle of the second century, would indicate that perishable foodstuff, probably grain, was stored sopra it.”