don't want this to sound like canned ham but thought i'd pitch in with something that i found which has solved this problem for many who have invested in solar on a rental
- install a pay as you go meter to the property -
in a nutshell electricity account stays in your name you collect...
Damp is the worst one, it is the hardest to get rid of and also the most dangerous to anyone living there. It's linked to respiratory diseases , cancers etc... Get rid of it or demolish the house ,there are no shortcuts to this... easy.