The City Planning Commission may authorize developments, enlargements and site alterations on 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 requested 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 requested has minimal impact on the existing natural topography and vegetation and blends harmoniously with it;

(d)        the requested 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.

Any development, enlargement or site alteration requiring an authorization pursuant to this Section shall be subject to all the requirements of Section 119-20 (PROVISIONS REGULATING TIER II SITES) for which an authorization or special permit has not been obtained.