Section 48.60  Non-Conforming Uses

a)         Regulations Not Retroactive – These zoning regulations shall not be construed to require the removal, lowering, or other changes or alterations of any structure or tree not conforming to these zoning regulations as of this effective date, or otherwise interfere with the continuance of any non-conforming use.  Nothing herein contained shall require any change in the construction, alteration, or intended use of any structure, the construction or alteration of which was begun prior to the effective date of these zoning regulations and is diligently prosecuted.

b)         Marking and Lighting – Notwithstanding the provisions of Section 48.60(a), the owner of any non-conforming structure, or tree is hereby required to permit the trimming of trees or the installation, operation and maintenance on such structures of such markers and lights as shall be deemed necessary by the Department to indicate to flyers in the vicinity of the airport, the presence of such airport hazards, all to be performed at the expense of the Greenville Airport Authority.