The provisions of Article I, Chapter 5 (Residential Conversion Within Existing Buildings), shall apply in the Special Coney Island District, as modified in this Section. The change of non-residential floor area to residences in buildings, or portions thereof, erected prior to January 1, 1977, shall be permitted subject to Sections 15-11 (Bulk Regulations), 15-12 (Open Space Equivalent) and 15-30 (MINOR MODIFICATIONS), paragraph (b). Uses in buildings erected prior to January 1, 1977, containing both residential and non-residential uses shall not be subject to the provisions of Section 32-42 (Location Within Buildings).