Besides the pre-existing temples, the enclosure included a library erected by Octavia in memory of her son Marcus Claudius Marcellus, the curia Octaviae, and a schola. Whether these were different parts of one building, or entirely different structures, is uncertain. It was probably in the curia that the senate is recorded as meeting. The whole is referred to by Pliny the Elder as Octaviae opera.
The portico was used as a fish market from the medieval period, and up to the end of 19th century. This role is remembered in the name of the annexed church of Sant'Angelo in Pescheria (Italian: "the Holy Angel in the Fish Market").