Accessory off-street parking spaces, open or enclosed, shall be provided for all developments or enlargements within the Special 125th Street District that contain residences, according to the provisions of the underlying district, as modified by the provisions of Section 97-50 (SPECIAL OFF-STREET PARKING AND OFF-STREET LOADING REGULATIONS), inclusive. However, for developments or enlargements within R6A Districts, the off-street parking regulations of an R7-2 District, as modified by the provisions of Section 97-50, inclusive, shall apply.