S.C. Code Ann. § 43-26-50
(a) The property custodians for all public property shall:
1. Prior to granting a permit or renewing a permit for the sale of articles listed in Section 43-26-60, on or in the public property within their control, grant the Commission an option to establish a vending facility operated by a blind person for the sale of such articles in a manner as such custodian may deem necessary.
2. Cooperate with the Commission in surveys of property under its control to find suitable locations for the operation of vending facilities, and grant an option for the establishment of such facilities to the Commission as the needs are determined.