Annual report. Upon issuance of a building permit for a personal wireless telecommunications tower site, the owner or operator of the site shall provide to the Secretary of the Borough Planning and Zoning Boards, an initial report signed and sealed by a licensed professional engineer certifying the estimated useful structural life of the tower, if any, as well as providing an initial inventory of all equipment and facilities on the site. After 50% of the useful structural life of a tower has lapsed, annual recertification reports as to the structural integrity of the tower shall be required. An updated report shall also be provided whenever antenna arrays are modified and shall include a detailed listing of all antennas and equipment. All vendors and lessees shall also be required to notify the above Borough Official when the use of such antennas or equipment is discontinued. If any of the reports disclose that a condition of any site presents an imminent hazard to the public health, safety or welfare, or that the tower facilities and equipment are no longer in use, the owner shall, and the Borough Engineer or Zoning Officer may order in their discretion that the owner take appropriate corrective action including, if necessary, the removal of the tower, facilities or equipment to protect the public health, safety and welfare. Personal wireless telecommunications towers, facilities and equipment shall be maintained to insure continued structural integrity. The owner of the site shall also perform such other maintenance of the structures and of the site so as to assure that it does not create a visual nuisance.