For every Institutional Development District established prior to March 31, 1978, there shall be provided, for the district, parking areas containing one parking space for each 4,000 square feet of the cumulative gross floor area of the building within the Institutional Development District area; for every Institutional Development District established after March 31, 1978, there shall be provided, for the district, parking areas containing one parking space for each 3,000 square feet of cumulative gross floor area of the buildings within the Institutional Development District area; provided, that for both of the above:

(a) Location. Off-street parking areas shall be located within a distance of 1,000 feet from the building or buildings which they propose to serve;

(b) Open air parking shall be governed by the applicable provisions of Section 14-1402(6)(a), (b) and (c) of this Title.