Any use which is made nonconforming by any use regulation, lot size, open space, height or building size regulations of this chapter or by any subsequent amendments may be continued except as hereinafter provided.

Any proposed change to a use deemed nonconforming by this chapter, or any proposed change to a previously approved use variance, shall not be permitted unless said change is to a permitted use or as otherwise provided in this chapter.

Such nonconforming building or structure (not including signs) which has been damaged or destroyed by any means to the extent of 80% or more of its full value, as determined by the City Assessor, or which has been condemned by the Building Inspector and ordered to be demolished shall not be rebuilt or repaired except in conformance with the regulations of this chapter. In the case of a permitted restoration of a nonconforming use, neither the floor area nor the cubical content shall be increased from the original nonconforming building or other structure. Full value shall be determined by dividing the latest assessment of such improvement by the latest state equalization rate, expressed as a percentage.

In any district, whenever a nonconforming use of land, building or structure (not including signs) or any part or portion thereof has been discontinued for a period of one year, such nonconforming use shall not thereafter be reestablished and all future use shall be in conformity with the provisions of this chapter. Such discontinuance of the active and continuous operation of such nonconforming use or a part or portion thereof for such period of one year is hereby construed and considered to be an abandonment of such nonconforming use, regardless of any reservation of an intent not to abandon the same or of an intent to resume active operations. If actual abandonment, in fact, is evidenced by the removal of buildings, other structures, machinery, equipment or other evidences of such nonconforming use of the premises, the abandonment shall be construed and considered to be completed upon such abandonment, and all rights to reestablish or continue such nonconforming use shall thereupon terminate.

In any district, nonconforming buildings or structures (not including signs) with an assessed value under $1,500 may be continued for a period of three years after adoption of this chapter, provided that after the expiration of such period, any such nonconforming use shall become an unlawful use and shall be terminated.

It shall be the duty of the Building Inspector to prepare and maintain a list of nonconforming uses of lands and buildings. Such record shall contain the names and addresses of the owners of such nonconforming use, any occupant other than the owner, a legal description of the land and the nature and extent of the use. The Inspector shall also note in this record the date at which the presence of the nonconforming use was first officially recognized.