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195 <br /> Landscaping Parking Areas <br /> While it is preferable to place off - street parking behind <br /> structures and away from the highway , when parking lots abut <br /> a street right - of - way or side or rear property line , <br /> screening is required . In addition to a minimum 10 foot <br /> landscape area , a 36 - inch high opaque screen consisting of <br /> landscape materials , rolling earth berms , and low screen <br /> walls or combinations thereof are required as an effective <br /> screening treatment . Where screening walls are provided , <br /> they must consist of solid and attractive materials enhanced <br /> by landscaping . <br /> Landscaped islands shall be provided at maximum intervals of <br /> every 10 parking spaces and at the ends of all rows of <br /> parking . Landscape islands shall have a minimum width of <br /> eight ( 8 ) feet . <br /> Building and Grounds <br /> Landscaping around the entire base ( foundation ) of structures <br /> is required to blend the architecture into the site , to <br /> soften the edge between the parking lot and structure ( s ) , and <br /> accent entrances . <br /> Additional landscaping to define use boundaries and <br /> circulation patterns , and create courtyard environments <br /> within the site is also required . <br /> No fence or wall shall be located within ten ( 10 ) feet of the <br /> front property line or of any street right - of - way line . <br /> Chain link fencing is not permitted in areas visible from <br /> adjacent properties , parking areas , street or pedestrian <br /> walkways unless it is screened through use of coniferous <br /> trees and / or appropriate shrub plantings . The number and <br /> distribution of trees which must be planted , by size follows : <br /> Number of <br /> Trees Per Acre of Percent <br /> Unobstructed Distribution of <br /> Open Space of Trees <br /> Use Category Large Small Large Small <br /> Industrial 20 10 70 % 3QX <br /> Distribution 64 26 70X 30X <br /> Flex Space 23 20 55 % 45 % <br /> Office 51 Z3 70X 30X <br /> Retail 39 t 5 7QX 3QX <br /> Service 24 52 30X 70X <br /> " Unobstructed open space " included all areas not covered by buildings , panting lots , driveways , <br /> sidewalbs , and other impervious surfaces , Parking lot islands may be counted as unobstructed <br /> open space if they are at least 500 square feet in area, <br />