Normal maintenance and incidental repair may be performed on any structure that is devoted in whole or in part to a nonconforming use, as long as the maintenance or repair will not, in any way, create any new nonconformity, increase the degree of any nonconformity, or increase the bulk of the structure. No structural alteration may be performed on any structure devoted to a nonconforming use, unless:the alteration is required by law; the alteration is necessary to restore the structure to a safe condition on order of any official charged with protecting the public safety; the alteration is for the purpose of bringing about a conforming use; or the alteration will not, in any way, create any new nonconformity, increase the degree of any nonconformity, or increase the bulk of the structure. Ord. 16-581