All accessory structures shall conform with the minimum yard regulations established in Article 1349, except as permitted below:
(a) Unattached Structures Accessory to Residential Buildings. Structures accessory to residential buildings which are not attached to a principal structure may be erected within the required side and rear yards of a principal structure, provided that they conform with the following:
(1) Maximum height. One and one-half stories or fifteen feet in height.
(2) Distance from side lot. For those lots twenty-two feet wide and less, a side yard shall not be required. For lots greater than twenty-two feet, but thirty feet or less, one side yard shall be required. Where a side yard is required or provided, it shall be a minimum of three feet from the side lot line. In those instances where a side yard setback is not provided, a two-hour rated fire wall shall be constructed on the side lot line side of the structure abutting the neighboring property.
(3) Distance from rear lot line. No less than four feet from the rear lot line.
(4) Distance from principal structure. Not less than ten feet from a principal structure.
(b) Unattached Structure Accessory to Nonresidential Buildings. Such accessory structures shall comply with front and side yard requirements for the principal structure and shall have a minimum rear yard of at least ten feet.
(c) Fences and Walls. Unless specifically noted, the provisions of the Zoning Ordinance shall not apply to fences, terraces or walls less than six feet in height above the average natural grade, nor to terraces, steps, unroofed porches or other similar features not over three feet high above the level of the floor of the ground story. (12-17-79)