A. Front Yard Exceptions.
1. If there are dwellings or accessory buildings on both abutting lots (even if separated by an alley or private way) with front or side yards abutting a public street with less than the required setback for the district, the front yard for the lot need not exceed the average yard of the abutting structures.
2. If there is a dwelling or accessory building on one abutting lot with a front yard of less than the required depth for the district, the front yard need not exceed the average yard of the depth of the abutting lot and the required front yard depth.
3. The front yard may be reduced to ten feet on hillside lots where the terrain has an average steepness equal to or exceeding a one foot rise or fall in four feet of horizontal distance within the entire required yard; vertical rise or fall is measured from the natural ground level at the property.
B. Side and Rear Yard Exceptions for Accessory Buildings and Accessory Residential Units.
1. Yards Abutting an Alley. For accessory buildings and accessory residential units that are not attached to any other building and not more and 15 feet in height, the side yard abutting an alley may be reduced to three feet and the rear yard abutting an alley may be reduced to four feet. The reduced side or rear yard provision does not apply to the primary structure.
2. Other Side and Rear Yards. For accessory buildings that are not attached to any other building, are not more than 15 feet in height, and are erected more than 50 feet from any street, the side or rear yard may be reduced to three feet, except when said yard is abutting an alley as provided in subsection 18.2.5.060.B.1, above.