A.
In computing the height of a building, with respect to the height limitations contained in this chapter, that portion of the building which constitutes an exempt story, as defined and prescribed in this chapter, shall not be counted.
B.
In order to qualify as an exempt story, a story in a building must meet the following requirements:
(1)
At least 90% of the floor area of the story shall be used for parking spaces, access aisles, lobbies, stairs and elevators.
(2)
Not more than 50% of the parking spaces provided on such floor shall be devoted to commercial garage use, including the parking or storage of vehicles for sale, hire, servicing or repair and the garaging of fleets of commercial vehicles.
(3)
The story shall have a minimum height, from finished floor to the bottom of overhead girders, beams or flat ceilings, of seven feet six inches.
(4)
No columns or posts shall be located so as to interfere with the free flow of traffic.
(5)
Such story shall either be enclosed by a solid wall at least four feet high or be enclosed from the bottom of the story to the top of the story with walls or paneling, of which at least 50% shall be composed of solid material.