The House of the Shops with Show-windows is a Trajanic building to the west of the Antonine Guild-seat of Trajan. It consists of rooms flanking an unpaved side-street of the western Decumanus, an alley that has been called Angiporto delle Taberne Finestrate. To the west is another unpaved side-street that became a dead-end street after a blocking at the rear (Vico Cieco).

Facing the Decumanus are three shops, behind which are back-rooms and a staircase leading to apartments. The alley could be blocked by a beam, inserted in holes in travertine blocks.

Many shops flank the Angiporto. The central part of the passageway is wider than the north and south end, and may be called a tiny square. The entrance and exit of the central part were marked by brick arches. The entrances of the shops were accompanied by large windows, which have been interpreted as show-windows. Many of these windows were, not much later, blocked with reticulate. An east-west passageway connected the Angiporto and the Vico Cieco. To the south of the passageway are a staircase and a large latrine.

The four southernmost rooms of the east half faced eastward. They became part of the later Guild-seat of Trajan to the east. If that was indeed the office of the Procurator Annonae, then this building may have been used by his clerks.

On the opposite side of the passageway are two halls. Their function is unknown. A double row of large brick piers in the northern one suggests that here something heavy needed support. In these rooms many geometric mosaics were found, stylistically dated to the years 130-150 AD, dated more accurately by a denarius of Antoninus Pius below the mosaics, from 140-143 AD.

Below the second century building remains were found of an older domus. Among the finds a mosaic with birds from the Julio-Claudian period stands out.