The City Planning Commission may, by special permit, modify the height and setback regulations, yard regulations, regulations governing minimum distance between buildings on a single zoning lot, and regulations governing courts and minimum distance between legally required windows and walls or lot lines, provided the Commission finds that such modifications are necessary to:

(a)        facilitate good design;

(b)        allow design flexibility for any development to which the mandatory provisions of Section 82-10 (MANDATORY DISTRICT IMPROVEMENTS) are applicable; or

(c)        incorporate a floor area allowance pursuant to Section 82-32 (Special Provisions for Increases in Floor Area) where inclusion of the proposed public amenity will significantly further the specific purposes for which the Special Lincoln Square District is established.