The provisions of this article shall regulate the continuation, termination, and modification of lots, structures, and uses which were lawfully established, but which no longer conform to the provisions of this title due to a change in zoning district boundaries or a change in the regulations for the zoning district in which it is located. A mere change in ownership or tenancy without any change in use, occupancy, or development shall not affect any of the legal nonconforming rights, privileges, and responsibilities provided under this article.