The Basilica is bordered on its short sides by two important ancient roads which led from the Tiber to the Forum: the Vicus Jugarius to the west, and the Vicus Tuscus to the east. The ground floor was divided into five east–west aisles inside, with the central aisle forming a large hall that measured 82x18 meters, sheltered by a three-story high roof. The adjoining aisles to the north and south of the central hall were divided by marble-faced brick columns which supported concrete arcades; the columns in turn supported the upper level of the basilica, which was used as a public gallery. The floor of the central hall was paved in colorful polychrome marble slabs, contrasting with the plain white marble of the adjoining aisles. The Basilica's façade as it appeared after the Augustan restoration was two stories high and arcaded, with engaged Carrara marble columns decorating the piers between the arches on both levels.