(a) Footings located six (6) feet or more but less than ten (10) feet below grade level may project not more than twelve (12) inches beyond the street or alley line. Footings located ten (10) feet or more below grade level may project not more than three (3) feet beyond the street or alley line.
(b) No other part required for structural support of a building, and no foundation wall below grade level, shall project beyond the street or alley line. Permissible projections above the grade level shall be supported by corbelling, bracketing or cantilevering from supports and foundations maintained within the street or alley line.