Within the districts established by this Zoning Code, or amendments that may later be adopted, there exist:
(a) Lots;
(b) Structures; and
(c) Uses of land and/or structures which were lawful before this Zoning Code was passed or amended, but which do not conform to regulations and restrictions under the terms of this Zoning Code or future amendments thereto. It is the intent of this Zoning Code to permit these nonconformities to continue until they are removed, but not to encourage their survival. It is further the intent of this Zoning Code that nonconformities shall not be enlarged upon, expanded or extended, nor be used as grounds for adding other structures or uses prohibited elsewhere in the same district.