Real estate as security. A licensee may take a lien upon real estate as security for any open-end loan at or after such time as the outstanding balance first exceeds $6,912. A subsequent reduction in the balance below $6,480 has no effect on the lien. A licensee may retain the security interest until it terminates the open-end account. If there is no outstanding balance in the account and there is no commitment by the licensee to a line of credit in excess of $6,912, the licensee shall, within 20 days following written demand by the borrower, deliver to the borrower a release of the mortgage on any real property taken as security for the open-end loan agreement. A real estate mortgage authorized for a financial institution secures all advances and obligations thereunder from the date of recording.
