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11 <br /> D. Parking Lot Design Requirements. The following requirements shall apply to <br /> parking Iots located in the B-3 zone: <br /> 1. The parking lot shall be separated from the public sidewalk by a landscape planter <br /> located outside of the public right-of-way which is a minimum of five feet wide <br /> (measured as specified in Section 35.060.A of this title) and contained within a planter <br /> bed raised a minimum of six inches above the abutting parking lot surface. Landscape <br /> areas shall be irrigated and maintained in accordance with Section 35.130. <br /> 2. The planter shall be planted with shrubs which are maintained at a minimum height <br /> of twenty-four inches and a maximum height of thirty inches above the abutting parking <br /> lot surface, spaced at five feet on center. Deciduous trees as specified by the planning <br /> director shall be planted in the planter spaced at not more than twenty feet on center. The <br /> spacing of trees may be modified by the planning director if the type of trees planted will <br /> be of a size which, at maturity, requires a greater spacing. <br /> 3. When a parking space which takes access from the alley is located behind a <br /> building and abuts the sidewalk, screening between the sidewalk and the off-street <br /> parking space may be provided in the form of a solid screen or wall not more than thirty <br /> inches above the surface of the parking area, in lieu of providing the landscaping required <br /> by subsection D.2 of this section. <br /> 4. Landscaping is not required in the interior of parking lots containing sixty or fewer <br /> parking spaces. For parking lots containing more than sixty parking spaces there shall be <br /> planted canopy-type trees in the interior of the parking lot at the rate of one tree per each <br /> twenty parking spaces. When this computation results in a fraction of one-half or greater, <br /> the fraction shall be rounded up to the next whole number. Tree wells shall be a <br /> minimum size of five foot square positioned so as not to eliminate parking spaces and <br /> built with raised six-inch curbs which act as wheel stops. <br /> 5. Parking lots shall be surfaced in accordance with the requirements of Section <br /> 34.080 of this title. Wheel stops shall be provided where needed to prevent damage to <br /> plant materials. <br /> 6. When the parking lot abuts an alley, access to the parking lot shall be taken from <br /> the alley. This requirement may be waived by the city engineer based upon extenuating <br /> topographic conditions or efficient traffic movement objectives. <br /> E. Off-Street Parking. <br /> 1. The required off-street parking spaces listed in Table #22-1 indicate the parking <br /> requirement for new buildings or additions to an existing building in the B-3 zone. As an <br /> alternative to the off-street parking standards contained in Table #22-1 for the B-3 zone, <br /> an applicant may propose an alternative parking standard which shall be reviewed by the <br /> planning director in accordance with Section 34.030. <br /> 2. Exceptions. <br /> a. Existing buildings which were built prior to zoning regulations or under a prior <br /> zoning code shall be permitted to be occupied without providing the additional off-street <br /> parking required by Table#22-1 for the B-3 zone. <br /> b. When an expansion of an existing building is proposed which adds the lesser of ten <br /> percent of the gross floor area that existed as of January 13, 1990, or one thousand square <br /> feet, no additional off-street parking shall be required for the new portion of the building. <br /> 172 <br /> ( 5 <br />