On any nonconforming structure, or portion of a structure containing a nonconforming use, work may be done on ordinary repairs or on repair or replacement of nonbearing wall fixtures, wiring or plumbing; provided, that the repair does not increase the degree of nonconformity of the use or building as described in sections 17.13.050 and 17.13.060 of this chapter. Nothing in this section shall be deemed to prevent the strengthening or restoring to a safe condition of any building or part thereof declared to be unsafe by the city building inspector upon order of such official. (Ord. 1191, 2015)