If a lawful use involving individual structures, or of a structure and land in combination exists at the effective date of adoption or amendment of the Zoning Code that would not be allowed in the district under the terms of this Zoning Code the lawful use may be continued so long as it remains otherwise lawful, subject to the following provisions.
(a) No existing structure devoted to a use not permitted by this Zoning Code in the district in which it is located shall be enlarged, extended, constructed, reconstructed, moved, or structurally altered except in changing the use of the structure to a use permitted in the district in which it is located.
(b) Any nonconforming use may be extended throughout any part of the building which was arranged or designed for the use at the time of adoption or amendment of this Zoning Code, but no nonconforming use shall be extended to occupy any land outside the building.
(c) Any structure, or structure and land in combination, in or on which a nonconforming use is changed to a permitted use, shall thereafter conform to the regulations for the district, and the nonconforming use shall not thereafter be resumed.
(d) When a nonconforming use of a structure, or structure and land in combination is discontinued or abandoned for more than two years (except when government action impedes access to the premises), the structure or structure and land in combination, shall not thereafter be used except in conformity with the regulations of the district in which it is located.
(e) Where nonconforming use status applies to a structure and land in combination, removal or destruction of the structure shall eliminate the nonconforming status of the land.
(f) A nonconforming residential use in a business district shall be permitted to continue as if they were in a residential district. The use must comply with the requirements of an R-1 Residential District. However, the use shall not be expanded into a combination business and residential use. Before the building is altered to be used for a business, the State Building Code, Fire Code, and all other applicable codes must be met.