In Areas A, C and E, all developments that are located on a zoning lot with frontage along Emmons Avenue, except for a zoning lot of less than 8,000 square feet that was in existence as of November 1, 1972, shall provide and maintain a plaza for public use which complies with the following requirements:
(a) The plaza shall abut the Emmons Avenue street line along the full length of such lot line or for a distance of at least 50 feet, whichever is less.
(b) The plaza shall be directly accessible to the public at all times from Emmons Avenue or an arcade or a plaza.
(c) The size of the plaza shall be at least 4,000 square feet in one location and shall not at any point be more than two feet below or five feet above street level, with a minimum dimension of 35 feet. At least 15 percent of the plaza area shall be landscaped and planted with trees, except when a zoning lot abutting both Dooley Street and Emmons Avenue is developed, such landscaping shall be at least 75 percent of the total plaza area provided with such development.
(d) The plaza shall contain lighting, pedestrian walks and sitting areas.
(e) No portion of a plaza area shall be used for parking or driveways.
(f) A plaza may include as permitted obstructions, sculptures, kiosks, or open cafes occupying in the aggregate not more than 30 percent of the total plaza area. Ice skating rinks are also allowed as permitted obstructions within such plazas only for the months from October through March, provided the minimum area of such plaza is 7,500 square feet. Exterior wall thickness, awnings and other sun control devices, pursuant to Section 37-726, shall also be allowed as permitted obstructions.