Partition & Co-Ownership  ·  October 8, 2026

Does a Tenant's Lease Survive a Partition Sale in California?

The short answer

It depends on who signed the lease, and on whether the tenant was made a party to the partition action. There is no single rule that leases always survive a partition sale, and no rule that they are always wiped out.

Three separate questions decide it, and they are often collapsed into one:

• Who granted the lease? A lease signed by one cotenant alone is valid as to that cotenant's interest, but it does not bind the non-joining cotenants' interests. A lease signed by all cotenants is a different instrument entirely.
• Was the tenant joined as a party? Code of Civil Procedure section 872.510 requires the plaintiff to name as defendants not only persons with interests of record, but also persons actually known to the plaintiff and persons whose interests are reasonably apparent from an inspection of the property. A partition judgment resolves the interests of the parties before the court.
• Does tenant-protection law apply anyway? A change of ownership does not by itself create a ground to terminate a tenancy protected by the Tenant Protection Act or a local rent stabilization ordinance. This question is independent of the first two.

Treat these as three gates, not one. A buyer can clear the first two and still be stopped by the third.

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Who signed the lease, and why does it decide the outcome?

The governing principle dates to 1936 and California courts continue to apply it.

In Swartzbaugh v. Sampson (1936) 11 Cal.App.2d 451 (4th Dist., Jan. 27, 1936), property was held in joint tenancy, and one joint tenant leased it without the other's consent. The non-joining joint tenant sued to cancel the leases. The court held that a lease of the whole property by one joint tenant, made without the other's consent, is not void. It is, in the court's words, "not a nullity but is a valid and supportable contract in so far as the interest of the lessor" is concerned. The lessee takes the possessory rights the lessor had.

But the lease binds only the lessor's share. The court quoted the rule that one joint tenant "may make a lease of the joint property, but this will bind only his share of it." The non-joining co-owner's interest is not extinguished, and she could not cancel the leases. The court indicated her remedy lay in being let into joint possession alongside the lessee, or in compelling an accounting for rents collected from third parties — though it noted the joint-possession rule had not been uniformly adopted and its application in California had not been directly decided.

A precision point worth keeping straight: Swartzbaugh arose in a joint tenancy, not a tenancy in common. The unity-of-possession reasoning it rests on is generally understood to apply to concurrent owners of either kind, and the discussion below assumes that. But if the distinction matters to your facts — and it can, because joint tenancy and tenancy in common diverge on survivorship and on the Partition of Real Property Act's scope — do not assume the case was decided on a tenancy in common.

That is the asymmetry that matters when the property is sold. A lease signed by only one of two cotenants was never an encumbrance on the other cotenant's undivided interest. A lease signed by both is an obligation of the whole title.

The practical test before anything else: pull the lease and look at the signature block. Does it bear every record owner's signature, or one? Where one co-owner handled the rental, the other may never have seen the executed lease.

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Who has to be named as a defendant in the partition action?

Code of Civil Procedure section 872.510 requires the plaintiff to join as defendants "all persons having or claiming interests of record or actually known to the plaintiff or reasonably apparent from an inspection of the property, in the estate as to which partition is sought."

Read that last category carefully. A tenant in occupancy is reasonably apparent from an inspection. An unrecorded lease does not keep the tenant out of the case; visible occupancy puts the plaintiff on notice.

Section 872.620 then requires that, to the extent necessary to grant the relief sought or other appropriate relief, the court shall upon adequate proof ascertain the state of the title to the property.

The architecture is coherent once you see it: everyone with a stake is brought in, the court determines what everyone actually holds, and the judgment resolves those interests. A leasehold is an interest. Leaving the tenant out does not make the lease disappear — it means the court has not adjudicated it, and the buyer inherits an unresolved question.

Three readers, three different takeaways.

For a co-owner planning to file: name the tenant. It is cheaper than the title problem you create by not naming them.

For a tenant who has been served with a partition complaint: you have been named because you have an interest the court will determine. That is not a formality, and it is not an eviction — but it is also not something you can ignore. The court will determine the leasehold whether or not you appear, and a tenant who does not respond within the time stated in the summons risks having that interest decided by default. Get the complaint to a lawyer before the response deadline runs.

For a buyer evaluating the property: check the docket for whether the tenant was joined. If they were not, the leasehold has not been adjudicated and you are bidding on an open question.

What a partition court cannot do

It is worth being precise about the limits of the court's powers while the action is pending.

Code of Civil Procedure section 872.130 allows the court, in the course of the action, to issue temporary restraining orders and injunctions, with or without bond, for three purposes: (a) preventing waste, (b) protecting the property or title thereto, and (c) restraining unlawful interference with a partition of the property ordered by the court.

That is the list. Section 872.130 is not a general power to clear occupants out of a building so it shows better at sale, and a request framed that way should expect resistance.

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Does the Tenant Protection Act protect the tenant after the sale?

This is the gate that catches buyers who assumed a partition sale delivers vacant possession.

Civil Code section 1946.2 provides that once a tenant has continuously and lawfully occupied a residential property for 12 months, the owner may not terminate the tenancy without just cause, and the written termination notice must state the cause (subdivision (a)). Where adult tenants are added before an existing tenant reaches 24 months, the protection applies only if all tenants have occupied for at least 12 months, or at least one tenant has occupied for 24 months or more.

A change of ownership is not on the list of just causes. Subdivision (b)(1) sets out at-fault causes — nonpayment of rent, material breach after written notice to correct, nuisance, waste, criminal activity, unauthorized subletting, refusing lawful entry, unlawful use, and others. Subdivision (b)(2) sets out no-fault causes: owner move-in, withdrawal of the property from the rental market, compliance with a government or court order or a local ordinance requiring the property to be vacated, and demolition or substantial remodel.

The owner move-in cause under subdivision (b)(2)(A) is the one buyers ask about, and its conditions are demanding:

• The occupant must be the owner or the owner's spouse, domestic partner, child, grandchild, parent or grandparent, and must occupy as a primary residence for at least 12 continuous months (clause (i)).
• It is unavailable if the intended occupant already occupies a rental unit on the property, or if a vacancy of a similar unit already exists there (clause (iii)).
• The notice must identify the intended occupant and their relationship to the owner, and state that the tenant may request proof (clause (iv)).
• The occupant must move in within 90 days after the tenant vacates (clause (v)).
• If the occupant does not move in within 90 days, or does not reside there for 12 consecutive months, the owner must offer the unit back to the former tenant at the same rent and terms and reimburse reasonable moving expenses incurred in excess of any relocation assistance already paid (clause (vi)).
• Clause (viii) defines "owner" for this purpose by reference to recorded ownership percentages and entity and trust structures — a detail that matters a great deal when the buyer at a partition sale is an LLC or a group.

For a no-fault termination under subdivision (b)(2), subdivision (d) requires relocation assistance regardless of the tenant's income: either a direct payment or a written waiver of the final month's rent before it is due, in an amount equal to one month's rent in effect when the notice was issued, with payment due within 15 calendar days of service of the notice. Under subdivision (d)(4), the owner must strictly comply or the notice is void.

Subdivision (e) lists the exemptions, and they are significant for co-owned property. They include housing with a certificate of occupancy issued within the previous 15 years, unless the housing is a mobilehome; single-family owner-occupied residences renting no more than two units or bedrooms; two-unit buildings where the owner occupied one unit at the start of and throughout the tenancy and neither unit is an accessory dwelling unit; owner-occupied housing where the tenant shares a bathroom or kitchen with the owner; and property alienable separate from the title to any other dwelling unit where the owner is not a REIT, corporation, LLC with a corporate member, or mobilehome park manager and the tenant received the required written exemption notice.

That last exemption is conditional on the notice actually having been given. The current version of section 1946.2 became operative April 1, 2024, and the section is repealed January 1, 2030. Local rent stabilization ordinances may impose their own, stricter just-cause and relocation rules, and in Los Angeles they frequently do.

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How does this play out in practice?

The single-signature lease. Two siblings own a duplex. One signs a two-year lease with a tenant; the other never signed and objects. Under Swartzbaugh, the lease is valid as against the signing sibling's interest and the tenant takes that sibling's possessory rights, but the non-signing sibling's undivided interest was never encumbered by it. Her remedy was to be let into joint possession alongside the tenant, or to seek an accounting from the signing sibling for the rents he collected — not cancellation of the lease. If the sibling in possession is also living there and shutting the other out, that is a different claim entirely; see what to do when a co-owner will not leave the house.

The all-owner lease. Both siblings sign. The leasehold is an interest in the whole title, and it should be adjudicated in the partition action with the tenant joined under section 872.510.

The protected tenant. Independently of either, if the tenant has continuously and lawfully occupied a covered residential property for 12 months, section 1946.2 requires just cause to terminate, and the new owner's acquisition at a partition sale is not itself a just cause. A buyer who assumed the sale delivered an empty building has a problem that no provision of the partition statutes solves.

What is genuinely unsettled here

We would rather say this plainly than imply more certainty than exists.

California's partition statutes require joinder of interest holders and require the court to determine the state of title, but they do not contain a single provision announcing that a partition sale extinguishes, or preserves, an existing lease. The outcome is assembled from the cotenancy rules, the joinder and title-determination provisions, the terms of the particular lease, and the order in which interests arose. As of October 8, 2026, we are not aware of a recent published California appellate decision resolving the question in a single rule, and a reader should treat any flat statement in either direction with caution.

What is not unsettled: who signed the lease matters, the tenant should be joined, and tenant-protection law operates independently of the partition.

If you are in one of these

A co-owner planning a partition of a tenanted property should get the lease reviewed before filing, not after the referee is appointed. A tenant served with a partition complaint should not assume it is an eviction — and should not assume it can be ignored; the response deadline on the summons still applies. A buyer evaluating a partition sale should price the tenancy, not the vacant building.

Our partition and quiet title practice handles these, and our article on the cotenant buyout right under the Partition of Real Property Act covers what happens between the co-owners themselves. If the property is held in an entity rather than directly, see what happens when the LLC owns the property. And if the co-owners signed an agreement about how the property may be sold, that agreement may change the partition analysis before the lease question is ever reached — see whether a co-ownership agreement can block a forced sale.

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Common questions

This article is general information about California law, not legal advice, and reading it does not create an attorney-client relationship. Statutes and case law change, and how they apply depends on the specific facts. Attorney advertising. Prior results do not guarantee similar outcomes. Robert B. Mobasseri, State Bar No. 193193, ROMO Law Group, Encino, California.