(A) Along any district boundary line, any abutting side yard on a lot in the less restricted district shall have a least width equal to that required in the more restrictive district. Where a lot in an “I” District abuts a lot in an “R” District, the side yard shall be increased by three feet for each story that the building proposed on such lot exceed the height limit of the said “R” District.
(B) On a corner lot, the least width of a side yard along the side street lot line shall be equal to the required front yard along the side street. No part of any accessory building shall be nearer a side street lot line than the least depth of any front yard required along such side street.
(C) The following projections or structures may be permitted in side yards:
(1) Accessory buildings or structures subject to the provisions contained elsewhere in this chapter;
(2) Fences, planting or walls not over six feet above the average natural grade;
(3) Fire escapes, three feet from side lot line. Bays and balconies not more than three feet from the building; provided these projections are entirely within planes drawn from either main corner of the side wall, making an interior angle of 22.5 degrees in the horizontal plane with the side wall. The sum of the lengths of such projection shall not exceed one-third of the length of the wall of the main building;
(4) Chimneys, flues, belt courses, leaders, sills, pilasters and lintels, ornamental features, cornices, gutters and the like into or over a required side yard not more than one and one-half feet; and
(5) Terraces, steps, uncovered porches, stoops or similar features, not higher than the elevation of the ground story of the building and distant three feet from a side lot line.
(D) Whenever a lot of record has an average width that is 20 or more percent less than the minimum average width required in the district in which it is located, the width of the side yards may be reduced to 10% of the average width of the lot, but no side yard shall be less than three feet in width unless authorized by the Board of Adjustment.