It shall be the duty of the sheriff to enforce the provisions of Section 17.52.130 whenever the vehicle involved is parked upon a public street. It shall be the duty of the building official to enforce the provisions of Section 17.52.130 whenever the vehicle involved is parked on any private premises in an R district and for such purpose he shall have the power of a peace officer and may enter upon any such premises for the purpose of determining whether or not there has been a violation of said section. (Prior gen. code § 8-60.18)