The Basilica Aemilia was originally built in 179 BC by the consuls Marcus Aemilius Lepidus and Marcus Fulvius Nobilor. Destroyed and rebuilt several times it was a substantial and luxurious public hall sporting a floor made of marble of various colours and even a bronze tiled roof.
If the hall was in part used by money lenders and tax collectors then it appears that they carried on their business until the very last possible moments. For the basilica was destroyed in AD 410 when the Visigoths sacked Rome. When the basilica burned down coins which had fallen to the floor the escape of the money dealers were welded into the marble floor by the intense heat.
Model of Rome in the days of Constantine the Great
Museo della Civilta, Rome