One of two buildings (called "libraries" by Ligorio) to the north of the Library Courtyard is a structure of unknown purpose abutting the Maritime Theater. It has three stories, the first of which is very high and divided into the three large rooms (3, 10, 12) and several smaller spaces. The formal and elevated nature of the large rooms is suggested by the floors and walls in opus sectile and the many statue niches. The second story was utilitarian, as is attested by the presence of praefurnia. The third floor was heated. The building faces a formal garden to the north. No brickstamps have been found here, so it is impossible to date the building. Scholars generally agree that the building was used for leisure activities such as banquets and date it to Phase I (118-125 CE).