They don’t hoard in a building with other people. All the cases I’ve seen in my state is they rent a house somewhere, and that’s where the hoarding goes on. They live nearby or just across a county line (because often they move from county to county from past hoarding judgments against them, stating they aren’t allowed to have more than 2-3 animals in that specific county). So they will either have a hoarder home outside the county where they currently live, or move to another county and rent out another space for the animals they are hoarding.
The recitivism rate is 100% if they do not get psychological help.