Mont. Code Ann. § 70-23-804

If the property is removed from the provisions of this chapter, as provided by 70-23-801 through 70-23-803, the property shall be considered owned in common by all the unit owners. The percentage of undivided interest of each unit owner in the property owned in common shall be the same as the percentage of undivided interest previously owned by such owner in the common elements. Liens affecting any unit shall be liens, in accordance with the then existing priorities, against the undivided interest of the unit owner in the property owned in common.