A. Regulations are not retroactive. The regulations prescribed by this chapter shall not be construed to require the removal, lowering, or other changes or alterations of any structure(s) or tree(s) not in conformance with this chapter as of January 1, 2016, or otherwise interfere with the continuance of any nonconforming use reasonably established prior to that date. Nothing in this chapter shall require any change in the construction, alteration or intended use of any structure, the construction or alteration of which began prior to January 1, 2016, and which has diligently prosecuted.
B. Notwithstanding the provisions of subsection A of this section, the owner(s) of any nonconforming structure(s) or tree(s) is hereby required to permit the installation, operation, and maintenance thereon of such markers and lights as shall be deemed necessary by the Airport Board, to indicate the presence of such hazards to aviators in the vicinity of the airport. Such markers and lights shall be installed, operated and maintained by the airport. (Ord. 2017-590, 4-6-2017)