S.C. Code Ann. § 6-7-1210: "Official map" defined.

"Official map" means a map or maps showing the location of existing or proposed public street, highway, and public utility rights-of-way, public building sites and public open spaces adopted by the governing authority of a municipality or county in accordance with the provisions of this chapter. A public building site is one on which a building is to be constructed for public use with public funds.