If you own a rental property in California, you have heard the terms RSO, LARSO, and AB 1482. What most landlords do not understand is that these are three different laws, and which one applies to your property depends on where exactly it is located, when it was built, and what type of structure it is.
Getting this wrong is not just an inconvenience. Charging rent above the allowable maximum, failing to register, or issuing improper notices can result in penalties, lawsuits, and requirements to repay double the excess rent charged.
📋 Quick summary: LARSO governs the City of Los Angeles (mainly pre-1978 buildings). LA County RSTPO governs unincorporated county areas. AB 1482 is California's statewide backstop where the others don't apply. Each has different rent increase limits, and they do not stack.
LARSO, also called the RSO, is the City of Los Angeles's rent control law, in place since 1978. It is one of the most expansive tenant protection frameworks in California.
LARSO generally applies to residential rental units in the City of Los Angeles built on or before October 1, 1978. Most apartment buildings qualify. Single-family homes and individually owned condos are typically exempt.
For covered units, LARSO sets the maximum annual rent increase, determined annually by the LA Housing Department. It also controls just-cause eviction protections, annual unit registration requirements, tenant relocation assistance, and habitability penalties.
⚠ Registration required: If your property is covered by LARSO, you must register it annually with LAHD. Failure to register can prevent rent increases and result in fines.
AB 1482, the Tenant Protection Act of 2019, created a statewide rent cap for properties not already subject to a stricter local ordinance like LARSO.
AB 1482 applies to most multi-family buildings built before January 1, 2005. Single-family homes and individually owned condos are generally exempt unless owned by a corporation, LLC, REIT, or other non-individual entity. If LARSO already covers your unit, AB 1482 does not apply on top of it.
Rent increases are capped at 5% + local CPI, or 10%, whichever is lower. In the LA area for 2025, with CPI at approximately 3%, the effective cap is 8%. AB 1482 also requires just cause for eviction after a tenant has lived in the unit for 12 months.
The Rent Stabilization and Tenant Protection Ordinance applies to unincorporated areas of Los Angeles County, areas within the county but outside the boundaries of any incorporated city. The maximum allowable increase as of 2025 is 1.93% for most units, or up to 2.93% for qualifying small landlords.
| Property Type | Location | Built | Likely Applies |
|---|---|---|---|
| Apartment, 2+ units | City of LA | Before Oct 1978 | LARSO / RSO |
| Apartment, 2+ units | City of LA | After Oct 1978, pre-2005 | AB 1482 |
| SFR (individually owned) | Anywhere in CA | Any | Likely exempt |
| Condo (individually owned) | City of LA | Any | Likely LARSO-exempt |
| Any residential rental | Unincorporated LA County | Before 2005 | LA County RSTPO |
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