Existing buildings and structures that are altered, modified, repaired, enlarged or in any way changed shall be made to conform to this chapter insofar as the new work is concerned and in accordance with the California Building Code as amended by Title 15 of this code; provided that if the building or structure to be altered or enlarged is a listed historic resource as defined in Chapter 17.604 of this code or is otherwise a qualified historical building or structure within the meaning of Health and Safety Code Section 18955, then alteration or enlargement may be made pursuant to the alternative building standards and building regulations of the State Historical Building Code. (Ord. 2013-0021 § 23; Ord. 2006-065 § 7; Ord. 2004-008 § 2; prior code § 49.01.104)