I am a little confused on this topic. I see that under Fair Housing Law, hoarding is considered a mental disability. I fail to see how they arrive at that point, but it is clear from the referenced literature. OK, so we accept it as another type of disability. So to me, what must also be accepted would be the disability of the hoarder would over ride the safety laws of living in the unit, if the law allowed them to do that, to continue with the hoarding. You cannot have both.
You cannot allow "hoarding" due to the disability of the tenant, and allow violation of the safety laws at the same time.
Now enter the "reasonable accommodation clause". I would ask you what kind of accommodation could you make for someone doing what you don't allow in your units?
Are you going to build them a shed to accumulate their hoarded items in?
Persons with disabilities are in a protected class, yes. If they are mentally disabled, ie: paranoia, bipolar, etc, they can be dealt with in housing if properly medicated, have a live in caregiver, etc. If a person is a disabled due to hoarding, they need to live in a warehouse or the woods, not public housing.
Require the disabled person to present a "solution" to YOU, not YOU to them.
I would enter the unit and do a thorough inspection with a family member or contact person with me. I would give 48 hours to correct the situation, or an eviction would be warranted. You can take all the actions cited in the posts in this thread.
However in the end, you cannot have both the hoarder syndrome and the well being of your complex at the same time.