(a) Each parking space provided for in an elderly housing facility shall at a minimum measure nine feet (9') in width and twenty feet (20') in length, with aisles measuring twenty-one feet (21') in width.
(b) There shall be provided one (1) such parking space per dwelling unit and per regular shift employee.
(c) Should additional parking spaces be deemed necessary, the Board of Zoning Appeals subsequently may approve a parking plan for an elderly housing facility which provides three (3) such parking spaces for every four (4) dwelling units, and one (1) per regular shift employee if the site plan includes a set-aside of landscaped area which is not part of any open- space requirement, and which is accessible to egress/ingress for parking purposes.