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Screening includes security fencing and specifying camouflage as . well as emphasison the attractiveness of the material and affect produced. Most commonly, ordinances submitted to the APA require landscaping around the base of the structure, with the height and depth for vegetation landscaping and screening in many ordinances while others required landscaping only for residential districts . Other options include requirements for standards to be determined by a local zoning board or design review board; requirement for a percentage of total site to be landscaped or screened; tree- planting requirements (such as one 6 ' tree for every 40 ' of frontage or "street trees required: ) . Specific non-vegetative screening commonly includes some form of screening around the base with specific descriptions that include brick masonry walls, chain link fences, solid wood fences, opaque barriers and berms . Some require landscaping or screening height standards of 4-24 feet. Finally, other ordinances require that the landscaping/screening be done in a manner that is compatible with the surrounding character, buildings or landscape Structure requirements include compliance with Electronics Industry Association (EIA standards and approval by a licensed structural engineer approved or hired by the city. Some of the items I have noted under design requirements probably are more appropriate to this category. With respect to safety considerations, the most conservative setback requirement specified 100 percent of the tower height, plus additional distance of 10-20 feet from the nearest property line or street orotect P- adjacentproperty from damage . imi The fact that some towers are designed to collapse within gil themselves could also be cited. Lot requirements could be added here. Although most cities do not include such requirements in their ordinances, those that do, provide for lot size based on the minimum allowed for whatever zoning district the tower is to be sited in. Lot requirements most often cited are given in square footage or acreage and range from 5, 000 square feet to 2 acres. A common method for determining lot size is to make it a function of 1) tower height, with the toppling factor being the primary justification; and 2) the concern over proximity of adjacent uses to an EMF source. Some cities provide for separate accessory structure setbacks from both the property line and tower itself . Accessory buildings and equipment are treated in a wide variety of ways . Some ordinances require that zoning district requirements apply to accessory structures; others did not . Others require only that the structures meet the building code. Others require that in residential districts, structures be designed to fit with the basic residential house design in the area. Others require design review board approval, while others have separate accessory structure setbacks from the property line and tower; others require the structures to have their own landscaping or screening. Where the III-I2