It is the intent of this Article to allow legally existing uses, structures, and properties that do not meet UDO requirements at the effective date or subsequent amendments to continue until they are discontinued, removed or are no longer used, but not to encourage their survival. These legally nonconforming uses, structures and properties are declared by this Article to be incompatible with permitted conditions in the Zone District where they are located. Nonconforming uses and structures shall not be enlarged, extended, or used as grounds for adding other structures or uses prohibited elsewhere in the same Zone District.