Subject to the requirements that there be a minimum distance of six feet between any point on a principal building and any point on any principal building on an adjacent lot, the following exceptions shall apply:
(A) Cornices, chimneys, planters, or other similar architectural features may extend two feet into a required yard.
(B) Open, unenclosed, uncovered porches at ground level may extend into a required yard not more than six feet.
(C) Fire escapes may extend into a required yard not more than four feet.
(D) Patios extending into required rear yards may be covered by a roof, but shall not be enclosed by walls.
(E) Canopies, eaves, balconies, roof overhangs or other similar features, not included in the foregoing parts of this section, may extend into a required yard not more than four feet.
(F) Average front yard exception: Except as otherwise provided in this section regarding yards adjoining “arterial” or “collector streets”, in all SR and MR Districts, where lots comprising 50% or more of the frontage on one side of a street between intersecting streets are developed with buildings having an average front yard with a variation of not more than ten feet, the average front yard of such buildings shall be the minimum required, provided such an average requirement is not less than 20 feet or more than 35 feet.
(`92 Code, § 40-4-16)