Definition. Within the zone districts (except Commercial Zone) established by this Section 10-1, or amendments that shall be adopted, there exist lots, structures, uses of land and structures, signs and characteristics of use which were lawful before this Section 10-1 was passed or amended, but which would be prohibited, regulated, or restricted under the terms of this Section 10-1 or future amendment. It is the intent of this Section 10-1 to allow these nonconformities to continue until they are removed, but not to encourage their survival.