Mont. Code Ann. § 70-23-611

In a voluntary conveyance of a unit, the grantee is jointly and severally liable with the grantor for all unpaid charges against the grantor for the grantor's proportionate share of the common expenses up to the time of the grant or conveyance, without prejudice to the grantee's right to recover from the grantor the amounts paid by the grantee for the common expenses. However, upon request of a prospective purchaser, the manager shall make and deliver a statement of the unpaid charges against the prospective grantor, and the grantee in that case is not liable for nor is the unit when conveyed subject to a lien filed for any unpaid charges against the grantor in excess of the amount set forth in the statement.