All conversions in buildings containing multiple dwelling residences that result in a total number of dwelling units of nine or more shall provide recreation space in accordance with the provisions of Section 23-63 (Required Recreation Space in Multi-family Buildings). However, such provisions shall be modified as follows:

1. where recreation space is provided outdoors, the minimum amount required shall be equivalent to a minimum of two percent of the residential floor area of the building; and
2. the provisions of paragraph (d) of such Section need not apply.