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18.78.080 C. Side Yard Setbacks. Side yard setbacks shall be a minimum of 25 feet. Main structures with a building elevation facing Foothill Road of between 80 to 100 feet in width shall have side yard setbacks of a minimum 45 feet. Main structures wider than one hundred feet shall have minimum side yard setbacks of 75 feet. D. Main Structure Height. The maximum height for any structure shall be 30 feet, measured vertically from the low- est point of the structure to the highest point of the structure, excluding towers, spires, cupolas, chimneys and other such uninhabitable projections. (Ord. 1468 1 (part), 1990) 18.78.080 Subdivision design. The following standards should be followed, when feasible, in any development within the district in order to achieve the purposes of this district: A. Open Space Between Lot Clusters. Lots created along Foothill Road, or any frontage road parallel to Foothill Road, shall be clustered such that natural open space a minimum of 200 feet in width shall separate clusters of lots. No more than three lots may exist in a cluster of lots. B. Prohibition on Foreridge Development. Building sites within lots shall not be allowed if they are located on or near ridges which do not have a background of Pleasanton or Main Ridges when viewed from Foothill Road. Landscaping in the form of mature trees may be an allowable background for such ridgeline sites if the decision making body fords that the landscaping will preclude the structure from dominating the skyline as viewed from Foothill Road. C. Access/Frontage Improvements. Use of individual driveways intersecting directly onto Foothill Road should be prohibited; combined, common access driveways serving more than one lot shall be encouraged. Use of frontage roads should be encouraged where topography, grading and similar considerations make such roadways feasible. D. Landscaping. Mature, native trees within the district shall be retained to the maximum extent feasible. Where feasible, mature oak and other native species should be relocated to grassland areas planned for development in order to soften the effect of new development with the corridor. New development landscaping shall be predomi- nantly native plant species in areas visible from Foothill Road, with lawn or turf areas in landscape schemes adja- cent to Foothill Road either eliminated or hidden by native landscaping. E. Retaining Walls. Retaining walls visible from Foothill Road should be faced with materials compatible with the natural setting, such as natural stone or wood. Where feasible, retaining walls should be stepped. Landscaping shall be incorporated to minimize adverse visual impacts, with planting in front of walls, within stepped recesses and/or overhanging the wall. F. Fencing. Open fencing shall be required, except that solid, privacy fencing may be allowed in areas of a lot not within required yard areas if it is screened with landscaping. (Ord. 1468 1 (part), 1990) 620