California Building Code Chapter 11B is enforceable, more stringent than the federal 2010 ADA Standards. Accessible route §11B-206: 36 in min clear width (32 in at single point), 48 in passing space every 200 ft, slope max 1:20 (or it counts as a ramp with handrails per 11B-405). Doors: 32 in min clear opening, max 5 lbf operating force. Ramps: max 1:12 slope, 30 in max rise per run, 60-in landings, handrails both sides if rise >6 in. Tenant-improvement gotcha: any TI project triggering more than 20% of replacement cost (or with primary-entrance work) requires path-of-travel upgrades per CBC 11B-202.4.