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18.84.090 adjoins an R district, the minimum side or rear yard shall be ten feet (10') greater than the minimum yard pre- scribed in the zoning schedule of this chapter; provided, that where the side or rear lot lines of a site in an I-G district adjoins an R district, the mini- mum side or rear yard shall be fifty feet (50'). D. On the side street of a corner lot, the minimum side yard for a garage, carport, or off street parking space required to serve a dwelling in an R district shall be twenty feet (20'); pro- vided, that if the garage, carport or off street parking space is entered parallel to the street, the minimum side yard shall be the same as the side yard oth- erwise required on the site. E. At the time of the initial construc- tion, 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 fifteen feet (15') of the rear lot line; provided, that there remains a single unobstructed open space with an area equal to one hundred twenty percent (120%) of the area obtained by multi- plying the required rear yard dimension by the minimum lot width prescribed for these zoning districts. This unob- structed 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 fifteen feet (15'). 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 fifteen feet (15') of the rear lot line, provided that there remains a single unobstructed open space with an area equal to eighty percent (80%) 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 fifteen feet (15' ). No structure referred to in this sec- tion projecting into the required rear yard shall exceed one story in height. F. Fences, walls, and hedges not over six feet (6') in height, walks, driveways and retaining walls may occupy a re- quired side or rear yard, except that solid fences, walls, and hedges in the side yard on the street corner of a cor- ner lot may not exceed a height of thirty inches (30"), 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 forty two inches (42"). In conjunction with the open fence, a solid base of brick or split face block up to a height of eighteen inches (18") may be constructed so long as the total fence height does not exceed forty two inches (42"), and decorative columns, caps, or pilasters up to a height of forty eight inches (48"), generally separated by a distance of six feet (6') may be con- structed. "Open picket style fencing" is defined as fencing which consists of narrow vertical boards, generally three inches (3") to four inches (4") in width, 579 (Pleasanton April 2003)