Where, at the time of adoption of this Part, lawful uses of land exist which would not be permitted by the regulations imposed by this Zoning Code, the uses may be continued so long as they remain otherwise lawful, provided:
(a) No such non-conforming uses shall be enlarged or increased, nor extended to occupy a greater area of land than was occupied at the effective date of adoption or amendment of this Part.
(b) No such non-conforming uses shall be moved in whole or in part to any portion of the lot or parcel other than that occupied by the uses at the effective date of adoption or amendment of this Part.
(c) If any such non-conforming uses of land are discontinued or abandoned for more than 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 Part for the district in which the land is located.
(d) No additional structure not conforming to the requirements of this Part shall be erected in connection with such non-conforming use of land.