Within Subdistrict A, the transparency requirements of paragraph (a) of this Section, subject to the modifications of paragraph (b) of this Section, as applicable, shall apply to developments, changes of use on the ground floor of a building or other structure, and enlargements that increase the floor area of the ground floor by more than 25 percent, but shall not apply to a change of use on the ground floor of a building located on Parcels E2 or G2, as shown on Map 5 (Parcel Designation and Maximum Building Heights) in Appendix A of this Chapter.

(a)        On all streets, at least 70 percent of the surface of the street wall shall be glazed, and at least 50 percent of the area of each such street wall shall be transparent to a minimum height of the ceiling of the ground floor, or not less than 15 feet above the finished level of the adjacent sidewalk, whichever is lower. The glazing material shall be highly transparent, with low reflectivity. Above this height, and to the top of the lower street wall, the street wall surface shall be at least 50 percent glazed and at least 30 percent transparent. Door or window openings within such walls shall be considered as transparent. Each such opening shall have a minimum width of two feet.

(b)        For street walls where the provisions of Section 104-332 (Type 2 street wall location) apply, the required glazing at the ground floor shall apply to the minimum height of the ceiling of the ground floor, or not less than 20 feet above the finished level of the adjacent sidewalk, whichever is lower.