You need to send a violation letter to the owner of the unit. You may have to go the distance to the point of weekly fines for non-compliance. This kind of violation involves health issues, and the non-payment of a health, welfare and safety violations can result in your association foreclosing on this unit.
Original article: https://www.reviewjournal.com/homes/homes-columns/barbara-holland/tenant-allows-homeless-people-to-live-in-storage-shed-2447671/
