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.
From the Sterman LA Multifamily Glossary — defined the way a broker with $1.41 billion across 254 closed transactions actually uses these terms.
Michael Sterman, Senior Managing Director Investments, Marcus & Millichap.
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