This structure had two parts: an upper level with rooms (1,2,3,4,6,18,19) facing a large garden to the south; and a lower level with rooms (7-15, and others beneath the upper-level) of utilitarian purpose such as storage rooms and perhaps dormitory rooms for the service staff. The upper rooms were lavishly decorated with walls and pavements in opus sectile, and Doric columns of cipollino marble. The building dates to Phase II (125-133 CE).