Such use or structure was in existence and lawfully operating at the time of the passage of this ordinance and has since been in regular and continuous use; or

Such use or structure is a lawful use at the time of the adoption of any amendment to this ordinance but by such amendment is placed in a district wherein such use is not otherwise permitted.

Nonconforming uses are hereby declared to be incompatible with the permitted uses in the districts involved.

It is the intent of this ordinance to permit such nonconforming uses to continue, under regulations herein contained, until the same are removed, but not to encourage their survival.

Except as herein provided, no nonconforming use of land or buildings nor any nonconforming structure shall be enlarged, changed, altered or repaired except in conformity with the regulations contained in this article.

A nonconforming use of a building may be extended throughout the building, provided:

No nonconforming use within a building may be extended to occupy any land outside the building.

No nonconforming use of land shall be enlarged or increased, nor extended to occupy a greater area of land than was occupied at the time the land became a nonconforming use.

When such use is discontinued or abandoned. Discontinuance or abandonment shall be defined as follows:

When any provision of this ordinance or any other ordinance, or Federal or State Statute is violated with respect to a nonconforming use.

When a nonconforming use is changed to a conforming use by rezoning.

When the structure in which a nonconforming use is housed, operated or maintained is damaged or deteriorated to the extent of more than fifty percent (50%) of its appraised value according to Ector [Navarro] County Appraisal District (FCAD).