The basic maximum floor area ratio of a zoning lot shall be as specified for the underlying district in Section 43-12 (Maximum Floor Area Ratio) and may be increased only pursuant to Section 43-13 (Floor Area Bonus for Public Plazas). No public plaza, or any part thereof, shall be permitted on or within 100 feet of a wide street. The provisions of Section 43-14 (Floor Area Bonus for Arcades) shall not apply.