Well, you need to make sure that is legal in your State, you need to weigh the UDAAP aspects of involving a primary residence into a negative pledge agreement and you need to make sure that this passes the fair lending smell test.
In truth, a negative pledge agreement is basically worthless, as it does not represent a lien and if the borrower would get a mortgage on their house, your only recourse is with the borrower for a breach of contract, so you would be in the same position as if it did not exist.
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