The "insulae" could be built up to nine storeys, before Augustus introduced a height limit of about 20 metres. The notably large "Insula Felicles" or "Felicula" was located near the Flaminian Circus in ; the early Christian writer Tertullian condemns the hubris of multiple-story buildings by comparing the Felicles to the towering homes of the gods. It is posited that a typical "insula" would accommodate over 40 people in only ; however, an entire structure could comprise about six to seven apartments, each covering about 1000 sq ft (92 sq m) in floor area. The only surviving insula in Rome is the five storey Insula dell'Ara Coeli dating from the 2nd century AD, which is found at the foot of the Capitoline Hill.