Before any nonconforming structure or trees may be replaced, substantially altered or repaired, rebuilt, allowed to grow higher, or replanted, a permit must be secured from the Zoning Administrator. Applications for approvals granted pursuant to this Chapter shall be made in accordance with the requirements of Chapter 18.10, Level V. No permit shall be granted that would allow the establishment or creation of an airport hazard or permit a nonconforming structure or tree or nonconforming use to be made or become higher or become a greater hazard to air navigation than it was on February 3, 1964, or than it is when the application for a permit is made. Except as provided herein, all applications for permits shall be granted. No such permit shall be required to make maintenance repairs to or to replace parts of existing structures which do not enlarge or increase the height of the existing structure. (Ord. 938, 2/3/64; 3433, 8/23/83)