Manufactured home parks lawfully operating prior to the effective date of the ordinance
from which this chapter is derived, but which do not conform to the regulations contained
herein may be continued. Provided however, no such park shall be extended or enlarged
and no such park shall be rebuilt or continued after abandonment or discontinuance
for more than 90 days, except in full conformity with this chapter. Provided further,
no such park shall be rebuilt in case of total destruction by fire or other causes
except in conformity with the regulations contained in this chapter, and no such park
which is partially destroyed by fire or other causes in excess of 50 percent of the
value of the park's facilities shall restored, rebuilt, or repaired unless in conformity
with this chapter.