Minn. Stat. § 514.21
The sale herein provided for shall be made at public auction between nine o'clock in the morning and five o'clock in the afternoon in the county where the property or some part thereof is situated. A notice stating the time and place of sale, the amount which will be due on the date of sale exclusive of the expenses of advertising and sale, and the grounds of the lien, giving a general description of the property to be sold, shall be served personally upon the owner of the property if the owner can be found within the county in which the property is stored, and if not, then it shall be mailed to the owner thereof at least three weeks before the time fixed for such sale if the place of residence or post office address of such owner is known by, or with due diligence can be learned by, the person claiming such lien, and shall be published once in each week for three successive weeks in a newspaper printed and published in the county where the property, or some part thereof, is situated, the last publication of such notice to be at least one week prior to the date of sale; or, if there is no newspaper printed and published in the county, then the notice of sale shall be posted in three of the most public places in the county at least three weeks before the time of sale. In case neither the place of residence nor the post office address of such owner is known to the person claiming such lien and cannot with reasonable diligence be learned, the publication or posting of notice, as herein provided, shall be sufficient to authorize such sale.
Minn. Stat. § 514.21
(8510) 1905 c 328 s 4; 1907 c 114 s 4; 1986 c 444; 2014 c 231 s 1