Where, at the time of adoption of this Ordinance, lawful uses of land exist which would not be permitted by the regulations imposed by this Ordinance, the uses may be continued so long as they remain otherwise lawful, provided:
(a) The non-conforming use may not be enlarged or increased unless approval by the Board of Zoning Appeals has been granted to the applicant.
(b) Upon Board of Zoning Appeals approval, a non-conforming use may be extended throughout a building which was designed and arranged for such use if no structural alterations are made, except those required by law.
(c) All non-conforming uses of land not involving any building or structure may be continued for a period of two (2) years after the date of enactment of the Zoning Ordinance and at the end of which period such non-conforming use shall cease or shall be changed to a conforming use.
(d) If a non-conforming use of land or any portion thereof is discontinued or abandoned for a continuous period of one (1) year (except when government action impedes access to the premises), any subsequent use of such land shall conform to the regulations specified by this Ordinance for the district in which such land is located.