I don't think it's "Additional Commission" . . . . but rather the just the Commission that the Owner of Record had agreed to pay you (but with money he doesn't have) and which is now going to be paid by the Lender.
"IF" it does turn out to be "extra" then I hope that Lender has a few branches around here because I want to work with their Mortgagors.
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Dale C. Hittle of GOLDEN RULE PROPERTIES in Glover, Vermont
Where We're Always Striving To Put Together "THE FAIR DEAL"