2007 California Building Code‚ Title 24‚ Part 2. Structures or portions of structures shall be classified with respect to occupancy in one or more of the groups listed below. A room or space that is intended to be occupied at different times for different purposes shall comply with all of the requirements that are applicable to each of the purposes for which the room or space will be occupied. Structures with multiple occupancies or uses shall comply with Section 508. Where a structure is proposed for a purpose that is not specifically provided for in this code, such structure shall be classified in the group that the occupancy most nearly resembles, according to the fire safety and relative hazard involved.The occupancy groups are as follows:1.Group A – Assembly (Section 303): Groups A-1, A-2, A-3, A-4 and A-52.Group B – Business (Section 304)3.Group E – Educational (Section 305)4.Group F – Factory and Industrial (Section 306): Groups F-1 and F-25.Group H – High Hazard (Section 307): Groups H-1, H-2, H-3, H-4 and H-56.Group I – Institutional (Section 308): Groups I-1, I-2, I-3 and I-47. Laboratory (Section 202): Group B, unless classified as Group L (Section 443) or Group H (Section 307)8.Group M – Mercantile (Section 309)9.Group C – Organized Camps (Section 440)10.Group L – Research Laboratories (Section 443)11.Group R – Residential (Section 310): Groups R-1, R-2, R-3, R-3.1 and R-412.Group S – Storage (Section 311): Groups S-1 and S-213.Group U – Utility and Miscellaneous (Section 312)Existing buildings housing existing protective social care homes or facilities established prior to 1972 (see Section341.3).