Minn. Stat. § 504B.431

A copy of the judgment must be personally served on every residential and commercial tenant of the residential building whose obligations will be affected by the judgment. If, with due diligence, personal service cannot be made, service may be made by posting a notice of the judgment on the entrance door of the residential tenant's dwelling or commercial tenant's unit and by mailing a copy of the judgment to the residential tenant or commercial tenant by certified mail.