For a development, enlargement or site alteration located within the Special Natural Area District, the City Planning Commission may authorize:

(a)        modification of lot coverage controls in accordance with the provisions of Section 105-431;

(b)        modification of underlying district regulations relating to bulk or parking in accordance with the provisions of Section 105-432 (Modification of yard, height and setback regulations, and parking location regulations);

(c)        modification of grading controls in accordance with the provisions of Section 105-433; and

(d)        modification of requirements for driveways and private roads on Tier I sites and Tier II sites in accordance with the provisions of Section 105-434.