The lawful use of a building existing at the time of adoption of this Chapter may be continued, although such use does not conform with the provisions of this Chapter and such use may be extended throughout the building; providing that no structural alterations except those required by law or ordinance are made therein. If no structural alterations are made, a non-conforming use of a building may be changed to another non-conforming use of the same or more restricted classifications. The foregoing provisions shall also apply to non-conforming uses in districts hereafter changed. Whenever a non-conforming use of a building has been changed to a more restricted use or to a conforming use, such use shall not thereafter be changed to a less restricted use.

In the event that any non-conforming structure or any structure devoted in whole or in part to a non-conforming use is damaged or becomes extensively deteriorated or is destroyed by any means to an extent equaling greater than fifty percent (50%) of its market value, such structure shall not be restored except in conformity with all applicable provisions of this Chapter, including the regulations of the zoning district in which the building is situated. However, such structure may be restored if the Board of Adjustment finds a compelling public necessity requiring the continuance of the non-conformity.

No building or portion thereof used in whole or in part for a non-conforming use in a dwelling district which remains unoccupied for a continuous period of one (1) year, whether or not the equipment or fixtures are removed, shall again be used except in conformity with the use regulations of the district in which such building is located.

No existing building or premises devoted to a use not permitted by this Chapter in the district in which such building or premises is located, except when required to do so by law or ordinance, shall be enlarged, extended, reconstructed or structurally altered, unless such use is changed to one (1) permitted in the district in which such building or premises is located. Where a non-conforming use relates to recreational vehicle parking requirements, the non-conforming use may continue until the recreational vehicle parked in non-conformity with this Chapter is sold, traded, donated, given away, destroyed, rendered inoperable, wrecked, or otherwise ceases to be regularly parked in non-conformity with this Chapter, except that the non-conforming use may continue if the recreational vehicle is replaced with a recreational vehicle of the same type and of the same or smaller size (for example, a motor home may be replaced with a motor home, but not a boat trailer, etc.).

Notwithstanding anything in this Chapter 405, otherwise conforming structures may be built on lots of record (i.e., legally platted and recorded) and in existence at the time of this amendment and any future amendments to Chapter 405 that would, but for this provision, otherwise make such lot or lots non-conforming, width or area; provided however, that such structures shall conform to setbacks and other regulations not involving size, area or width of the lot.