How about this:
Borrower gets a loan to start a tavern and secures it with a 1-4 family rental. Original note was a three year balloon. At maturity, the note is refinanced with a new note but now the borrower is living in one of the apartments in the 1-4 family property. No new money was given, just a renewal of the previous business purpose loan. Still business purpose??
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How long until retirement??