Minn. Stat. § 507.331
Where any instrument affecting the title to real estate in this state recites the existence of a contract for conveyance affecting such real property, or some part thereof, and the instrument containing such recital was recorded prior to 1910 in the office of the county recorder of the county wherein the real property, or some part thereof, is situated, and no action or proceeding has been taken upon such contract for conveyance and the time for performing the conditions contained in such contract expired prior to 1925, then such recital may be disregarded and shall not constitute notice of the contract for conveyance, either actual or constructive, to any subsequent purchaser or encumbrancer of the real property, or any part thereof.
Minn. Stat. § 507.331
1941 c 192 s 1; 1976 c 181 s 2