The following regulations shall control nonconforming uses in existence on December 28, 1964:

Any use of land or buildings on December 28, 1964, which use does not conform to the requirements of this chapter but which is not prohibited by any other law or ordinance, including this chapter, in effect prior to, December 28, 1964, may be continued. Any use of lands or buildings as of December 28, 1964, which is prohibited by this chapter and was prohibited by any other ordinance of the Borough shall be a violation of this chapter and shall not be a permitted nonconforming use.

Any building which has been damaged by fire or other causes to the extent or in excess of 70% of its assessed valuation or more than 50% of its volume, whichever damage shall be greater, or, if as the result of such destruction, the use of the structure is entirely discontinued for a period of more than six months, then the building and land on which the building was located or maintained shall be subject to all the regulations specified by this chapter for the district in which such land or building are located.

No nonconforming structure in existence on December 28, 1964, shall be extended, added to or altered unless such alterations or additions are in conformity with the provisions of this chapter. The provisions in this section shall not be construed to allow extension of any nonconforming structure or of any nonconforming use of land or structure into any front yard or side or rear yards or other reserved open spaces provided for in this chapter.

Nonconforming business structures existing in Residence Zones on December 28, 1964, and which are not in violation of any ordinance in effect at that time, may be used for any business allowed in the General Commercial Zone, but may not be extended or added to.

A nonconforming use abandoned for a period of two years may not be re-established.