It shall be the duty of the Office of General Services to supervise and regulate the parking of motor vehicles at the facilities named in Section 29-5-2 except for the state board of health building and the governor’s mansion, and to make all necessary regulations therefor to the end that parking space shall be available for state officers and employees whose official duties require their presence therein, and for business visitors, authorized members of the press, tourists and other visitors who are in need of parking space at any such building, subject, however, to the special provisions of Section 29-5-65 which apply when the legislature is in session.