Minn. Stat. § 507.20: GRANTOR TO MAKE KNOWN ENCUMBRANCE.

In all conveyances by deed or mortgage of real estate upon which any encumbrance exists, the grantor, whether executing the same in the grantor's own right, or as executor, administrator, assignee, trustee, or otherwise by authority of law, shall, before the consideration is paid, by exception in the deed or otherwise, make known to the grantee the existence and nature of such encumbrance, so far as the grantor has knowledge thereof.