The Building of the Shops with Show-Windows is a Trajanic building to the west of the Antonine Schola del Traiano. It consists of rooms flanking an unpaved side-street of the western Decumanus, today known as 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 Angiporto 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 entrance to each shop was accompanied by a large window, apparently a show-window. 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 may have become part of the later Schola del Traiano. 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.