Rohnert Park, CA Rental Property Rules: Rent Increase Notice (2026)

Section 9.70.050 governs the one increase a mobile home park landlord can take without appealing to the board: the annual general adjustment. Starting each February 1st, a landlord may raise a controlled space's rent by an amount tied to the Consumer Price Index, specifically one-half of one percentage point less than the CPI increase measured from September of the prior year to September of the current year, rounded to the nearest tenth of a percent. If the CPI falls, no increase or decrease is authorized. Regardless of how high the CPI runs, the section caps the annual general adjustment at four percent.

Notice is built into the mechanism: subsection A requires the Rent Appeals Board to announce the amount of the annual general adjustment on or before December 15th of each year and to mail that figure, along with the conditions attached to it, to every homeowner/resident and landlord in the program. A landlord who provides gas or electricity to a resident at no charge may add an extra half a percentage point to the increase for each utility supplied, and unused increases can be banked and applied later under subsection C. Subsection D blocks a landlord from taking the annual increase at all while out of compliance with the chapter or with city health and building codes; Section 9.70.055 separately provides that if the chapter's vacancy-control or prospective-homeowner-rights provisions are ever invalidated, the adjustment formula reverts to 75 percent of CPI with the same four percent cap.