I live in a condo and there is a hoarder on my stairwell. It's an anxiety disorder...
Her place is awful. Well, was. I really wanted to get in there and do something, I got on the Board and tried, but the rest of the Board didn't want to get involved even though we had a legal right and obligation to do so. I called the City, and they didn't have a lot of resources either. The smell. The place was packed to the rafters with Goodwill junk.
Recently we had new siding/windows put on. She had to make the inside available to the construction crew (by law.) She had to clean it out. She had to throw out all the appliances, the carpet, the kitchen cabinets, all the drywall had to be replaced. I'll bet it cost her $70-80,000 to pay to clean it and fix it up again (took four men over a week full-time just to clean it out) and now I am just thinking, well, she'll just do it again.
At least she's old. Like 75. I know, I'm a horrible person.