California's Tenant Protection Act (AB 1482) caps annual rent increases at 5% plus the local rate of inflation, or 10%, whichever is lower. This applies to most residential properties that are at least 15 years old.
The law also requires landlords to have just cause for eviction, providing significant protections for long-term tenants. Some cities like San Francisco and Los Angeles have even stricter local rent control ordinances that may provide additional protections.
If you're a tenant in California, it's important to know that your landlord must provide proper written notice of any rent increase, and increases cannot exceed the cap. Violations can be reported to local housing authorities.