S.D. Codified Laws § 32-7B-21
For purposes of this chapter, the term, principal place of business, means an enclosed commercial structure located within the State of South Dakota, easily accessible and open to the public at all reasonable times, with an improved display area immediately adjoining the building that is large enough to display five or more boats of the type the dealer is licensed to sell. It is the location at which the business of a vehicle dealer may be lawfully carried on in accordance with all applicable building codes, zoning, and other land use ordinances and in which building the public may contact the vehicle dealer or the dealer's salesperson. It is the location where the books, records, and files necessary to conduct the business of the boat dealer are kept and maintained. In no event may rooms in a hotel, motel, apartment house, or any part of any single or multiple unit dwelling house be considered a principal place of business unless the entire ground floor of such facility is devoted principally to and occupied for commercial purposes. Any dealer licensed under this chapter shall maintain and continuously occupy a principal place of business.
SDCL 32-7B-21