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multiplying the required rear yard dimension by the minimum lot width prescribed for these zoning districts. This unobstructed open area may be located in a side yard and/or in the area between the principal structure and the rear lot line and shall have a minimum dimension of not less than 15 feet. Additions to principal structures in the R-1-8,500, R-1-7,500, R-1-6,500 and RM-4,000 districts may encroach into otherwise required rear yards to within 15 feet of the rear lot line, provided that there remains a single unobstructed open space with an area equal to 80 percent of the area obtained by multiplying the required rear yard dimension by the minimum lot width prescribed for these zoning districts. This unobstructed area may be located in a side yard and/or in the area between the principal structure and the rear lot line and shall have a minimum dimension of not less than 15 feet. No structure referred to in this section projecting into the required rear yard shall exceed one story in height. F. Fences, walls, and hedges not over six feet in height, walks, driveways and retaining walls may occupy a required side or rear yard, except that solid fences, walls, and hedges in the side yard on the street side of a corner lot may not exceed a height of 30 inches, and open fencing, such as wrought iron, split rail, picket style, or other similar types of open fencing, may not exceed a maximum height of 42 inches. In conjunction with the open fence, a solid base of brick or split face block up to a height of 18 inches may be constructed so long as the total fence height does not exceed 42 inches, and decorative columns, caps, or pilasters up to a height of 48 inches, generally separated by a distance of six feet may be constructed. "Open picket style fencing" is defined as fencing which consists of narrow vertical boards, generally three inches to four inches in width, with at least 33 percent of the fence area being open to view. No such structure or hedge shall pose a traffic sight obstruction. In the C-S, C-A, I-P and I-G districts, fences as high as eight feet may be allowed in conjunction with outdoor storage areas. The upper two feet of such fences may contain barbed wire. Permission of the zoning administrator shall be required for such over height fences and may be denied if the zoning administrator determines the appearance of such fencing would conflict with the purposes of this title or if such fencing would be detrimental to the public health or general welfare. In the R-1-6,500 and R-1-7,500 districts, fences, walls and hedges not over six feet in height may be located to within five feet of the side property line on the street side of a corner lot between the rear property line and a point set back 15 feet from the front corner of the residence closest to the side street. G. Fences, walls and hedges greater than six feet but not over eight feet in height may occupy a required side or rear yard upon approval by the zoning administrator. 1 . Application for an over height fence, wall or hedge pursuant to this subsection shall be made with the zoning administrator and shall be subject to design review. 2. The zoning administrator may require noticing up to 300 feet from the property lines in order to continue processing the design review application. If the determination to notice the application is made. it may be subject to a zoning administrator hearing.