It is the purpose of this article to provide for the regulation of nonconforming buildings, structures and uses and to specify those requirements, circumstances and conditions under which nonconforming buildings, structures and uses will be operated and maintained. It is necessary and consistent with the establishment of zoning districts that nonconforming buildings, structures and uses not be permitted to continue without restriction. Furthermore, it is the intent of this article that all nonconforming uses shall be eventually brought into conformity.