These provisions shall apply to all buildings or structures
and all uses of buildings or structures or lots lawfully existing
prior to the effective date of this chapter or of subsequent amendments,
revisions or reenactments of such chapter, which buildings or structures
or uses do not conform to the provisions of said original Zoning Law
or to such revisions or reenactments on their effective dates.
No unlawful building or structure or unlawful use of a building
or structure or lot existing at the effective date of this chapter
shall be deemed to be a nonconforming building, structure or use.
A one-family detached dwelling or its customary accessory structure existing on a described parcel held in single and separate ownership at the effective date of this chapter may be enlarged or extended in an amount not to exceed 50% of the first-floor area, provided that any existing nonconforming yard dimensions are not reduced further, and further provided that the lot coverage shall not exceed the present zoning requirements. No other nonconforming use shall be enlarged or extended nor shall the degree of nonconformity of a nonconforming building be increased except as provided in §
560-52B.
A nonconforming use shall be changed only to a conforming use, except as provided in §
560-52B.