SDCL § 5-12-2: Terms of members--Vacancies--Quorum.

All appointments to the South Dakota Building Authority shall be made for a four-year term. Each member's term of office shall expire on the appropriate third Monday in January, but he shall continue to hold office until his successor is appointed and qualified. Any vacancy in the authority shall be filled by appointment for only the balance of the unexpired term. Four members of the authority shall constitute a quorum.