In C6-1A Districts, the parking requirements of C4-4 Districts as set forth in Section 36-20 (REQUIRED ACCESSORY OFF-STREET PARKING SPACES FOR COMMERCIAL OR COMMUNITY FACILITY USES) shall apply to commercial or community facility uses. However, for all office uses listed in Use Group 6B of Section 32-15 (Use Group 6), there shall be one parking space per 4,000 square feet of floor area.