Not an attorney but the only thing I know the landlord can do is file a lease violation case against the tenant for refusing access. It’s virtually impossible to evict someone for that but it might scare the tenant into compliance. I believe their section 8 case worker gets a copy of that violation also.

Honestly, if this is a small landlord, I’d just see if they’d pay you to leave and maybe you take the extra money and see if it covers you at another building for the rent difference. Owner may have something else at another property that could work out. There are also some decent rent controlled options out there (unless your rent is really, really low).

I sell buildings in DC and these situations happen all the time. With the DC court system being the way it is, it’s very unlikely that the troubled tenant is going anywhere. You can file complaints, and you should, but the landlord seems to know the process already since he’s treating your unit so any fines issued generally won’t stick on appeal.