The use regulations of the underlying districts are modified in:

(a)        the East Midtown Subdistrict in accordance with the provisions of Section 81-62 (Special Use Provisions), inclusive;

(b)        the Theater Subdistrict in accordance with the provisions of Sections 81-72 (Use Regulations Modified) and 81-73 (Special Sign and Frontage Regulations); and

(c)        the Fifth Avenue Subdistrict in accordance with the provisions of Section 81-82 (Special Regulations on Permitted and Required Uses).