I would agree with Ski that your applicant is BUYING the portion of the home he does not already own, and this would be reported as a purchase. Furthermore, even if there were a lien already on the property that would be paid in full with a new mortgage, I would report it as a purchase (see page 12 of GIR, under "Multipurpose Loan").
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Management is doing things right; leadership is doing the right things. Peter Drucker