The City Planning Commission may authorize developments, enlargements and site alterations on a Tier II site or on portions of a zoning lot having a steep slope or steep slope buffer.

In order to grant such authorizations, the Commission shall find that:

(a)        the development, enlargement or site alteration is not feasible without such modification, or that the modification will permit a development, enlargement or site alteration that satisfies the purposes of this Chapter;

(b)        such modification is the least modification required to achieve the purpose for which it is granted;

(c)        the modification has minimal impact on the existing natural topography and vegetation and blends harmoniously with it;

(d)        the modification will not disturb the drainage patterns and soil conditions of the area; and

(e)        the development, enlargement or site alteration takes advantage of the natural characteristics of the site.

The lot coverage regulations of Table II of Section 105-33 (Residential Lot Coverage Regulations on Tier II Sites or on Sites Granted an Authorization Pursuant to Section 105-422) shall apply to any residential development, enlargement or site alteration granted an authorization pursuant to this Section.

Any development, enlargement or site alteration requiring an authorization pursuant to this Section shall be subject to all the requirements of this Chapter for which an authorization or special permit has not been obtained.