Updated April 17, 2026
The LA County RSTPO covers residential rental properties in unincorporated LA County. Since January 2025, it caps rent increases at 60% of CPI with a 0–3% range — stricter than LA City RSO.
RSTPO applies to buildings outside any incorporated city but within LA County — examples include Florence-Graham, Altadena, Ladera Heights, parts of East LA. The January 2025 amendment tightened the allowable increase to 60% of CPI with 0% floor and 3% ceiling. Small landlord (≤4 units, natural-person ownership) bump: +1%. Luxury bump: +2%. Enforcement by LA County DCBA.
RSTPO is now stricter than LA City RSO — a reversal of historical logic. Unincorporated LA County buildings face a structural valuation discount relative to otherwise-identical LA City buildings. Most owners have not yet repriced their expectations to reflect this inversion.
For county owners weighing a sale, see how rent control affects your apartment building's sale price and how to sell an apartment building in Los Angeles.
Thinking about selling? Get a no-obligation evaluation on your building.
Request Free Evaluation →