What the law says in California
California's Mobilehome Residency Law (MRL) caps annual lot rent increases and requires specific notice procedures. The cap structure typically references either a flat percentage or a percentage tied to the Consumer Price Index, with a hard ceiling that prevents the cap from rising indefinitely in high-inflation years. Operators must include the cap calculation in every increase notice.
Rent-increase notices in California typically must be delivered by certified mail with return receipt or by another method that produces an admissible delivery record. Verbal notification or text-only notice almost never meets the statute. The notice must include the new rent amount, the effective date, and (in rent-controlled jurisdictions) the cap calculation showing how the increase complies.
Notice period for rent increases in California
California requires 90 days advance written notice before a rent increase takes effect on a month-to-month tenancy. For fixed-term leases, the increase typically can't take effect mid-term — you have to wait until renewal and provide the notice within the same 90-day window before the renewal date.
Operators who short the notice period — say, providing 30 days when the statute requires 90 — typically can't enforce the increase in court. The standard remedy is the increase doesn't take effect until the proper notice period has run, which means you've effectively delayed your own revenue recognition.
What this means for operators
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Document the cap calculationInclude the percentage applied and (if CPI-tied) the CPI figure used. Audits of your records will look for this.
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Use certified mailStandard for rent-increase notices in California. Delivery confirmation is admissible in court if the resident later disputes receiving the notice.
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Don't skip annual increasesOperators who skip 2-3 years of increases and then try to apply a 12% catch-up trigger both legal challenges and resident relations problems. In rent-controlled California, you can\'t catch up later — the cap resets each year.
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Coordinate with your leaseIf your lease has different notice or cap provisions than Mobilehome Residency Law (MRL), the more protective rule for the resident usually applies. Update your lease template to match state requirements.
Recent trends and what to watch
California has been an early-adopter state on MHP rent control. Watch for follow-on legislation that might tighten the cap further, lengthen notice requirements, or add new tenant protections around lease non-renewal. Industry associations like the Manufactured Housing Institute publish state-tracking reports that flag pending bills.