Before that portion of any nonconforming structure that exceeds the height limitation established by the airport zoning map and Section 17.50.040 may be structurally altered and before any non-conforming structure or tree may be replaced, reconstructed, allowed to grow higher or replanted, a permit must be secured from the planning commission authorizing such structural alteration, replacement, reconstruction or change. Those portions of an existing nonconforming structure below the applicable height limitations may be structurally altered, repaired and added to, and those portions of an existing nonconforming structure above the applicable height limitation may be repaired and minor replacements made therein, without securing such a permit unless such structural alteration, repair, addition or enlarge that portion of the structure that exceeds the applicable height limitation. No such permit shall be granted that will allow the establishment or creation of an airport hazard or permit a nonconforming structure or tree or non-conforming use to be made or become higher or become a greater hazard to air navigation that it was on the date that this chapter was made applicable to a particular airport or than it was when the application for a permit was made, but all other application for such permits shall be granted. (Ord. 2017-01 (part), 2017: prior code § 7628)