Mont. Code Ann. § 71-1-223
71-1-223 Power of sale
71-1-223 . Power of sale. When a real estate mortgage confers a power of sale, either upon the mortgagee or any other person, to be executed after a breach of the obligation for which the mortgage is a security, either an action may be maintained under this part to foreclose or proceedings may be had under the provisions of the mortgage.