If any change in title of possession or renewal of a lease of any such lot or structure occurs, the use existing may be continued.

If any nonconforming use, structure or activity is discontinued for a period exceeding two years after the enactment of this chapter or any amendment thereto, it shall be deemed abandoned, and any subsequent use shall conform to the requirements of this chapter.

A nonconforming structure, lot or use may be changed only to another use of a substantially similar character as the original use or to a more restrictive use.

Whenever a nonconforming structure, lot or activity has been changed to a more limited nonconforming use, such existing use may be changed only to an even more limited use.

When any nonconforming use is superseded by a permitted use, the use shall thereafter conform to the regulations for the district, and no nonconforming use shall thereafter be resumed.

A nonconforming structure shall not be extended or enlarged.

A nonconforming activity may be extended throughout any part of a structure which was arranged or designed for such activity at the time of passage or amendment of this chapter.

Except as otherwise provided in § 420-16.7D below, if a nonconforming activity or structure is destroyed or damaged in any manner to the extent that the cost of restoration to its condition before the occurrence shall exceed 50% of the cost of reconstructing the entire structure, it shall be restored only if it complies with the requirements of this chapter. However, structures which are nonconforming only because of inadequate street frontage or lot width may be reconstructed provided that a variance of yard and/or setback requirements, if required, is obtained from the Board of Zoning Appeals.

Except as otherwise provided in § 420-16.7D below, where a conforming structure devoted to a nonconforming activity or where a nonconforming structure is damaged less than 50% of the cost of reconstructing the entire structure, either may be repaired or restored, provided that any such repair or restoration is started within 12 months and completed within 18 months from the date of such partial destruction.

The cost of land or any factor other than the cost of the structure shall be excluded in the determination of the cost of restoration for any structure or activity devoted to a nonconforming use.

If a nonconforming building or use is damaged or destroyed by fire, natural disaster or other act of God, such building may be repaired, rebuilt or replaced to eliminate or reduce the nonconforming features to the extent possible, without the need to obtain a variance. Such building may also be repaired, rebuilt or replaced to its original nonconforming condition. The owner shall apply for a building permit and any work done to repair, rebuild or replace such building shall be in compliance with the provisions of the Uniform Statewide Building Code. Any work done to repair, rebuild or replace such building shall be in compliance with the provisions of the local floodplain regulations adopted as a condition of participation in the National Flood Insurance Program. Unless such building is repaired or rebuilt within two years of the date of the natural disaster or replaced within two years of the date of the natural disaster or other act of God, such building shall only be repaired, rebuilt or replaced in accordance with the provisions of this chapter. However, if the nonconforming building is in an area under a federal disaster declaration and the building has been damaged or destroyed as a direct result of conditions that gave rise to the declaration, then the owner shall have an additional two years for the building to be repaired, rebuilt or replaced as otherwise provided in this section. For purposes of this section, owners of property damaged by an accidental fire have the same rights to rebuild such property as if it were damaged by an act of God. Nothing herein shall be construed to enable the property owner to commit an arson and obtain vested rights under this section.