Accessory off-street parking spaces are not required in Zone C. However, a maximum of 300 public parking spaces are permitted in subzones C-1 and C-2 combined, provided that:

(a)        such spaces shall be completely enclosed;

(b)        no portion of the parking facility, other than entrances and exits, shall be visible from adjoining zoning lots, streets, parks or the Esplanade ;

(c)        no exhaust vents shall open onto any street or park; and

(d)        the parking facility shall not be more than 23 feet above curb level.