A basilica in Ancient Rome was a large public building where business or legal matters could be transacted.
Wikipedia https://en.wikipedia.org/wiki/List_of_Roman_basilicas
Official Website http://archeoroma.beniculturali.it/en/node/148
Address 6 Via di Santo Stefano Rotondo, Roma 00184, Italy
Coordinates 41°53'8.953" N 12°29'47.845" E