Health and Safety Code section 33420.1
(a)
For unreinforced masonry buildings, to meet the requirements of Appendix Chapter A1 of the current California Existing Building Code (Part 10 of Title 24 of the California Code of Regulations).(b)
For any buildings that qualify as “historical property” under Section 37602, to meet the requirements of the State Historical Building Code (Part 2.7 (commencing with Section 18950) of Division 13) and the current California Historical Building Code (Part 8 of Title 24 of the California Code of Regulations).(c)
For buildings other than unreinforced masonry buildings and historical properties, to meet the requirements of Appendix A: Guidelines for the Seismic Retrofit of Existing Buildings of the International Existing Building Code unless superseding building standards for existing buildings are adopted in the California Building Code (Part 2 of Title 24 of the California Code of Regulations).
Source:
Section 33420.1, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=HSC§ionNum=33420.1.
(accessed Jun. 2, 2025).