I do not see where adding more land mets the HMDA definition of home improvement:
Home Improvement Loan
A home improvement loan is (a) any dwelling-secured loan to be used, at least in part, for repairing, rehabilitating, remodeling, or improving a dwelling or the real property on which the dwelling is located, and (b) any non-dwelling-secured loan (i) that is to be used, at least in part, for one or more of those purposes and (ii) that is classified as a home improvement loan by the institution.