I don’t want to insult your logic, but what you are saying just makes no sense.
did you ever have an appraisal done on your house? Maybe you should go review how those things work. Fair market value is based on the market. Given that the market is determined by what people are willing to pay (not some abstract estimate of what “land” is worth), the market should have been set by what Trump and Guccione offered.
Face it, they were trying to screw her.