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84 <br />85 <br />86 <br />(5) <br />Building Height: In order to improve the appearance of uninterrupted facades. buildings <br />over 100 feet in length shall be at least one and one-half (1 %2) stories in height for at <br />least thirty percent (30%) of their length. <br />87 (6) Restricted Exterior Materials: Unadorned pre -stressed concrete panels, whether <br />88 smooth or raked, non -decorative concrete block, sheet metal, corrugated metal or <br />89 unfinished metal shall not be used as exterior materials. This restriction shall apply to <br />90 all principal structures and to all accessory buildings except those accessory buildings <br />91 not visible from any property line. No more than twenty-five percent (25%) of any <br />92 exterior wall on a building shall be fiber cement siding, wood or metal accent material. <br />93 <br />94 <br />95 <br />96 <br />(7) <br />Roofs: Roofs which are exposed or an integral part of the building aesthetics shall be <br />constructed only of commercial grade asphalt shingles, wood shingles, standing seam <br />metal. slate. tile. or copper. Flat roofs. which are generaIIv parallel with the first floor <br />elevation. are not subiect to these material limitations. <br />97 (8) euildinq Mechanical Equipment: All roof vents. pipes and/or other roof penetrations <br />98 (except chimneys). shall be fully screened. located on the rear elevations. or be <br />99 otherwise configured to the maximum extent practicable to have a minimal visual <br />100 impact as seen from a public street. Wood fencing or chain link with slats shall not be <br />101 used for screening. A cross -sectional drawing shall be provided that illustrates the sight <br />102 lines from the ground level view. <br />103 a.Acceptable Roof -based Mechanical Equipment Screening: <br />104 1. Parapet walls or other techniques included as an integral part of the <br />105 building design shall be used to totally screen any roof -based <br />106 mechanical equipment from public rights -of -way or adjacent lands. <br />107 <br />108 <br />109 <br />110 <br />111 <br />112 <br />113 <br />2. The parapet wall finish materials shall match the major exterior <br />materials provided on an exterior wall. <br />3. The parapet walls shall be provided along all perimeter walls. <br />4. Parapet walls may vary in height but shall not exceed the building height <br />of the respective district. <br />5. The back of the parapet wall and/or its supports shall be screened from <br />view from adjoining properties and public streets. <br />114 6. In cases where roof -based mechanical equipment are too tall to be <br />115 screened by a parapet wall, or if changes in the surrounding grade make <br />116 rooftops with parapets visible from public rights -of -way or adjacent <br />117 lands, a rooftop screening system shall be used for screening. <br />118 <br />119 <br />120 <br />121 <br />122 <br />123 <br />124 <br />125 <br />126 <br />