(a) As to buildings occupied by a business establishment which does not share the exterior openings of such building with any other business establishment, the person operating such business shall be responsible.
(b) As to buildings occupied by two or more business establishments who share the same exterior openings of such building, the owner of the building, or his agent having charge, care or control of such building, shall be responsible.
(1978 Code Sec. 5-28)