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Sections 3406.4 Change of Occupancy of the California Building Standards Code 2007 Edition, (24 C.C.R.), and including by reference the International Building Code, 2006 Edition, Volumes 1 and 2 is amended to read as follows: 3406.4 Change of Occupancy. When a building or portion thereof is subject to a change of occupancy such that a change in the nature of the occupancy results in a higher seismic occupancy factor based on Table 1604.5; or where such change of occupancy results in a reclassification of a building to a higher hazard category as shown in Table 3406.4; or where a change of a Group M occupancy to a Group A, E, I- 1, R-1, R-2, or R-4 occupancy with two-thirds or more of the floors involved in alteration work and total accumulated work area exceeds 50% of the aggregate area of the building, the building shall conform to the seismic requirements of the Building Code for a new structure. Exceptions: 1. Specific detailing provisions required for a new structure are not required to be met where it can be shown that an acceptable level of performance and seismic safety is obtained for the applicable occupancy category using reduced CBC level seismic forces as prescribed in Section 3403.5.1.1.3. The rehabilitation procedures shall be approved by the Building and Safety Official and shall consider the regularity, overstrength, redundancy and ductility of the lateral-load-resisting system within the context of the existing detailing of the system. 2. When a change of use results in a structure being reclassified from Occupancy Category I or II to Occupancy Category III and the structure is located in a seismic map area where Sps < 0.33, compliance with the seismic requirements of this code and ASCE 7 are not required. 3. Where the area of the new occupancy with a higher hazard category is less than or equal to 10 percent of the total building floor area and the new occupancy is not classified as Occupancy Category IV. For the purposes of this exception, where a structure is occupied for two or more occupancies not included in the same occupancy category, the structure shall be assigned the classification of the highest occupancy category corresponding to the various occupancies. Where structures have two or more portions that are structurally separated, each portion shall be separately classified. Where a structurally separated portion of a structure provides required access to, required egress from or shares life safety components with another portion having a higher occupancy category, both portions shall be assigned the higher occupancy category. The cumulative effect of the area of occupancy changes shall be considered for the purposes of this exception. TABLE 3406.4 (~('.C':T TPANCY HA7.ARD CATEGORIES RELATIVE HAZARD OCCUPANCY CLASSIFICATIONS 1 (Hi est Hazard H 2 I-2, I-3, I-4 3 A, E, I-1, M, R-1, R-2, R-4 74