Tell your sister that if the "squatter " is employed, she should have some rights to garnish his wages.... I know that there are some screwy things about renters having rights to not pay rent... but it seems to me that they have to prove they are unemployed..... And if it is a rent to own, if there is legal paperwork, then the "prospective owners" may be liable for the taxes as it is "their improvement".... all according to how they worded it and if it is on paper. If not, then they may not have much recourse.... I would get an attorney of her own..... people like that ought to get put out on the street and shot. I think that if he is working, she should have some legal recourse.... and if they put that quonset hut up and it is "attached" to the property..... not a temp thing that has no foundation, it does belong to the owner of the property. Here in Va, if you hang a gate on hinges/pins, it automatically becomes a part of the property.... All the gates we have at pastures are wired/tied to the posts, not on pins or hinges.....PITA to open as we have to "drag them open" instead of swinging open... but at $100 or more each... not leaving gates on rented properties....