Mont. Code Ann. § 70-6-603
Self-storage use -- prohibition on residential or other unlawful purposes
70-6-603 . Self-storage use -- prohibition on residential or other unlawful purposes. (1) An operator may not knowingly permit a leased space at a self-storage facility to be used for residential purposes.
(2) A renter may not use a leased space for residential or other unlawful purposes.