South Dakota Codified Laws
Chapter 14 - Precincts And Polling Places
Section 12-14-16 - Campaign signs at nonpublicly-owned polling place.

12-14-16. Campaign signs at nonpublicly-owned polling place.
If any nonpublicly-owned building is used as a polling place, the building owner may designate whether campaign signs will be allowed on the building's premises outside the area defined in §12-18-3 on election day. If campaign signs are allowed, the building owner may not prohibit signs from any particular campaign.

Source: SL 2007, ch 73, §2.