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(3) Any proposed personal wireless service tower shall be designed, structurally, <br />electrically, and in all respects, to accommodate both the applicant's antennas and <br />comparable antennas for at least two additional users if the tower is over 90 feet in <br />height or for at least one additional user if the tower is over 60 feet in height. Towers <br />must be designed to allow for future rearrangement of antennas upon the tower and to <br />accept antennas mounted at varying heights. <br />(k) Antennas mounted on roofs, walls, and existing towers. The placement of commercial <br />antennas on roofs, walls, and existing towers may be approved by the city, with a <br />conditional use permit, provided the antennas meet the requirements of this chapter. In <br />addition to the submittal requirements required elsewhere in this chapter, an application for <br />a building permit for antennas to be mounted on an existing structure shall be accompanied <br />by the following information: <br />(1) A site plan showing the location of the proposed antennas on the structure and <br />documenting that the request meets the requirements of this chapter; <br />(2) A building plan showing the construction of the antennas and the proposed method of <br />attaching them to the existing structure, and documenting that the request meets the <br />requirements of this chapter; <br />(3) Certification by a qualified and licensed professional engineer indicating the existing <br />structure or tower's ability to support the antennas. <br />(l) Nonconforming existing antennas and towers. Antennas and towers in residential districts <br />and in existence as of the effective date of the ordinance from which this chapter is derived <br />that do not conform or comply with this section are subject to the following provisions: <br />(1) Towers may continue in use for the purpose used and existing as of the effective date <br />of the ordinance from which this chapter is derived, but may not be replaced or <br />structurally altered without complying in all respects with this section. <br />(2) If such towers are subsequently damaged or destroyed due to any reason or cause <br />whatsoever, the tower may be repaired and restored to its former use, location, and <br />physical dimensions upon obtaining a building permit for the repair or restoration, but <br />without otherwise complying with this chapter, provided, however, that if the cost of <br />repairing the tower to the former use, physical dimensions, and location would be 50 <br />percent or more of the cost of a new tower of like kind and quality, then the tower may <br />not be repaired or restored except in full compliance with this section. <br />(m) Abandoned or unused towers or portions of towers. All abandoned or unused towers and <br />associated facilities shall be removed within 12 months of the cessation of operations at the <br />site unless a time extension is approved by the city. In the event that a tower is not removed <br />within 12 months of the cessation of operations at a site, the tower and associated facilities <br />may be removed by the city and the costs of removal assessed against the property. After the <br />facilities are removed, the site shall be restored to its original or an improved state. <br />(n) Interference with public safety telecommunications. No new or existing <br />telecommunications service shall interfere with public safety telecommunications. <br />(o) Additional submittal requirements. <br />(1) In addition to the information required elsewhere in this chapter for an application for <br />a building permit for towers and their antennas, applications for conditional use permits <br />for such towers shall include the following supplemental information: