The lawful use of a building or premises existing on the fourth
day of August 1930, or authorized by a building permit issued prior
thereto, may be continued, although such use does not conform to the
provisions of this chapter.
A nonconforming use shall not be changed unless changed to a
conforming use. No nonconforming use, if once changed to a use permitted
in the district in which it is located, shall be changed back to a
nonconforming use.
No nonconforming use which shall have been discontinued for
a period exceeding one year shall be resumed or replaced by any other
nonconforming use.
It shall be the duty of every owner of land or building devoted
to a lawful nonconforming use to obtain a certificate of occupancy
therefor. The Code Enforcement Officer shall have the authority to
issue such certificates upon submission of documentary evidence establishing
such nonconforming use.