Cal. Civ. Code § 1954.51
California Civil Code
Operative Text
As used in this chapter, the following terms have the following meanings: (a) “Comparable units” means rental units that have approximately the same living space, have the same number of bedrooms, are located in the same or similar neighborhoods, and feature the same, similar, or equal amenities and housing services. (b) “Owner” includes any person, acting as principal or through an agent, having the right to offer residential real property for rent, and includes a predecessor in interest to the owner, except that this term does not include the owner or operator of a mobilehome park, or the owner of a mobilehome or his or her agent. (c) “Prevailing market rent” means the rental rate that would be authorized pursuant to 42 U.S.C.A. 1437 (f), as calculated by the United States Department of Housing and Urban Development pursuant to Part 888 of Title 24 of the Code of Federal Regulations. (d) “Public entity” has the same meaning as set forth in Section 811.2 of the Government Code. (e) “Residential real property” includes any dwelling or unit that is intended for human habitation. (f) “Tenancy” includes the lawful occupation of property and includes a lease or sublease.
Cal. Civ. Code § 1954.51 establishes the definitions that govern the broader chapter's rent-related protections and requirements. Key terms such as 'comparable units,' 'owner,' 'prevailing market rent,' 'residential real property,' and 'tenancy' are each given specific meanings that apply throughout the chapter. Notably, 'prevailing market rent' is tied to a federal HUD calculation methodology, and 'owner' explicitly excludes mobilehome park operators and mobilehome owners from the chapter's scope.
Plain English — not legal advice.
Cal. Civ. Code § 1954.51 sets the foundational vocabulary that shapes how other provisions in this chapter apply to property owners and managers. Operators who fall within the definition of 'owner' — including those acting through agents or who have succeeded a prior owner — should be aware that this chapter's rules apply to them, while those operating mobilehome parks or owning mobilehomes are carved out. Compliant operators generally ensure that any comparisons of rental units or assessments of market rent align with the specific definitions provided here, particularly the HUD-based methodology for 'prevailing market rent.'
General guidance for property managers — not legal advice for your specific situation. Consult an attorney for advice on your case.
Cal. Civ. Code § 1954.51 defines the terms that underpin the tenant protections found throughout this chapter, including what qualifies as 'residential real property' and what constitutes a 'tenancy' — which covers leases, subleases, and other lawful occupations of a dwelling. Tenants whose housing falls within the definition of 'residential real property' and whose occupancy qualifies as a 'tenancy' under this section may be entitled to the protections the broader chapter provides. Those who believe a landlord is misapplying these definitions — for example, by disputing whether units are truly 'comparable' — can explore options such as raising the issue with a local rent board where one exists or reaching out to a tenant-rights organization for general guidance.
General guidance for tenants — not legal advice for your specific situation. Consult a tenant-rights organization or attorney for advice on your case.
Generated September 3, 2026 — auto-generated, not yet human-reviewed. See /transparency for methodology.
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