YAVAPAI COUNTY PLANNING AND ZONING ORDINANCE Page 115 be considered (for required setback purposes) as having two (2) front yards. No device, such as doors and windows, may be so installed as to protrude beyond a lot boundary in the operation thereof. A. Yard deviations, where not in conflict with future width line: 1. Front Yard Deviations: a. Where all or some of the existing buildings in the same block with a proposed building, and lying within one hundred feet (100’) therefrom, vary from the minimum front yard requirements, then the average front yard depth for such existing buildings shall determine the required minimum yard depth for such proposed building (unless waived in writing by owners of such other buildings). In no case may such yard depth be less than the minimum required for the District, nor need such yard depth be required to exceed by fifty percent (50%) of the required minimum. b. On lots rising or descending in elevation from front to center or rear to center and exceeding twenty-six percent (26%) grade thereon, the front yard may be reduced not to exceed fifty percent (50%) of the required minimum. 2. Side Yard Deviations: a. On any interior Residential Zoned lot lacking rear access (other than from the front street) and where a garage or carport is not attached to the principal building, then one (1) side yard must measure no less than nine feet (9’) to provide access to rear parking. b. On a corner lot backing to a Key lot no structure exceeding a four foot (4’) height may be located adjacent to the side street within a triangular area formed by a line connecting the street intersection with the required front setback line of the Key lot. c. When a lot sides on an alley, such required side yard adjacent thereto may be reduced not to exceed fifty percent (50%) provided such reduced setback, plus half the alley width, is not less than the yard width required for the District. d. On legal sub-standard width lots an interior side yard may be reduced by half the lot width shortage, provided such reduction does not exceed twenty-five percent (25%) of the required yard width. 3. Rear Yard Deviations: a. On lots of less than two hundred eighty feet (280’) depth the required rear yard shall be increased by the width of a potential half alley. b. On lots exceeding a two hundred eighty feet (280’) depth the required rear yard shall be increased by the width of a potential half street. c. On lots rising or descending in elevation from front to center or rear to center and exceeding twenty-six percent (26%) grade thereon, the rear yard may be reduced not to exceed fifty percent (50%) of the required minimum. B. Encroachment into yards, where not in conflict with future width lines: No structure (other than fences, free standing walls or signs) shall be located so as to encroach upon or reduce any open space, yard, setback requirement, lot area or parking area as is designated under these Provisions or under the Provisions of the District in which located, except that: 1. All Yards Encroachments: