S.D. Codified Laws § 10-11-16
Any property owner or taxpayer of a township or municipality, as an individual or through an attorney or agent, feeling aggrieved by anything in the assessment roll may appeal to the local board of equalization for the correction of alleged errors in the listing or valuation of the person's property. Any lessee responsible for payment of taxes pursuant to the provisions of a lease shall be considered the taxpayer and may appeal anything in the assessment roll for the correction of alleged errors in the listing or valuation of the leased property. An appeal to the local board of equalization shall be perfected by mailing or by filing a notice of appeal with the clerk of the local board of equalization. If perfected by mailing, the postmark shall be conclusive evidence regarding the timeliness of the appeal. The clerk of the local board of equalization shall be notified of the appeal no later than the Thursday preceding the third Monday in March. An appeal to the local board shall encompass the aggregate valuation of the property being appealed or the property classification.
SDCL 10-11-16