Is there a relationship between them?
You are requesting the property non-owner to commit to paying for something they do not own, and the property owner to have their loan refinanced without any skin on their part, whether they pay or not. I personally would not touch this one without legal getting involved, especially if there might be a state law issue. With the way the courts are, IMHO, it seems that there could be too many claims down the road.
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Integrity. With it, nothing else matters. Without it, nothing else matters.