For the purposes of this Section, the minimum required open space ratio for a building on a zoning lot shall be 40.0. However, if a zoning lot is developed pursuant to Sections 94-08 (Special Floor Area Bonus Provisions) or 94-094 (Authorization provisions for transfer of development rights to receiving lots), then the minimum open space ratio may be modified as set forth in this Section. For every 0.10 increase in permitted floor area ratio on a zoning lot, the corresponding required open space ratio may be decreased by not more than 2.0. In no event shall the required open space ratio on a zoning lot be less than 25.0.