What Is Concurrent Ownership?
Most Californians who co-own property with a sibling, friend, or business partner — without being married and without signing a joint tenancy deed — hold that property as tenants in common, whether they realize it or not. It’s the state’s default rule, and it shapes what each owner can and cannot do without asking permission.
Tenancy in common, in one sentence: it is a form of concurrent ownership where two or more people each hold a separate, undivided interest in the whole property, with no right of survivorship, so that each owner’s share passes through their own estate at death rather than automatically to the co-owners.
Cal. Civil Code § 682 confirms this default: an interest created in favor of several persons is presumed to be a tenancy in common unless the instrument expressly declares a joint tenancy, community property, or another form of ownership.
The Core Features of Tenancy in Common
Each co-tenant holds an undivided interest — meaning every owner has the right to occupy and use the entire property, not just a fractional slice of it. If Ana and Ben own a duplex as tenants in common, both can walk into every room, not just “their half.”
Shares don’t have to be equal. The default presumption is equal shares only when the deed is silent on proportions; nothing stops a deed from giving Ana a 70% interest and Ben 30%. Each co-tenant can independently sell, lease, mortgage, or devise their own share without asking the others — a right that surprises many new co-owners.
Rights and Duties Among Co-Tenants
Concurrent ownership creates an ongoing relationship, and California law imposes real obligations to keep it functional:
- Occupancy. Every co-tenant may occupy the whole property; one co-tenant generally cannot exclude another without amounting to an ouster.
- Contribution. A co-tenant who pays more than their share of property taxes, mortgage interest, or necessary repairs can seek contribution from the others.
- Leasing to outsiders. Under Swartzbaugh v. Sampson, 11 Cal. App. 2d 451 (1936), one co-tenant can lease the entire property to a third party without the other co-tenant’s consent. The non-consenting co-tenant’s remedy is an accounting for their share of the rent — not eviction of the tenant.
- Improvements. A co-tenant who makes improvements doesn’t automatically get reimbursed, but may receive credit for the added value when the property is eventually partitioned or sold.
Encumbering Your Share — and Only Your Share
Because each tenant in common owns a distinct, severable share, that co-tenant can grant a mortgage or deed of trust on their own interest alone. If Ana mortgages her share to a lender and later defaults, the lender’s foreclosure reaches only Ana’s undivided interest — the lender becomes a new co-tenant alongside Ben, not the owner of the whole property. This matters enormously in California, where deed of trust foreclosures are common and fast; a title search on co-owned property should always check whether each co-tenant’s share is separately encumbered.
Partition: The Ultimate Remedy
When co-tenants can’t agree on the property’s future — sell it, keep it, renovate it — any co-tenant has an essentially unwaivable right to sue for partition. California courts can order:
| Partition Type | What Happens | When Used |
|---|---|---|
| Partition in kind | Physical division of the land into separate parcels | Rare; only when the property can be fairly divided without harming value |
| Partition by sale | Court-ordered sale, proceeds split by ownership share | The far more common outcome, especially for a single house |
A forced sale can be painful for a co-tenant who wants to keep the property for sentimental or investment reasons, but California courts will not force unwilling co-owners to remain tied together indefinitely.
Worked Example
Priya and her brother Raj inherit their late father’s Oakland fourplex as tenants in common, each with a 50% undivided interest. Priya moves into one unit and collects all the rent from the other three units without telling Raj. Two years later, Raj discovers this and demands his share.
Question: What are Raj’s rights?
Analysis: As co-tenants, both Priya and Raj have the right to occupy the whole property, but Priya’s collection of all the rental income from third-party tenants — without accounting to Raj — triggers her duty to share. Raj is entitled to an accounting and payment of his proportional share (50%) of the net rents Priya collected from the leased units. If Priya also occupies a unit rent-free, most California courts treat this differently from renting to an outsider — a co-tenant in sole possession generally does not owe rent to the other co-tenant absent an ouster, unless the parties agree otherwise. If Raj and Priya cannot resolve the dispute, Raj can file a partition action, most likely resulting in a court-ordered sale of the fourplex with proceeds split according to their respective shares (adjusted for any contribution or accounting owed).
Common Mistakes to Avoid
- Assuming co-ownership automatically means joint tenancy — California presumes tenancy in common unless the deed expressly says otherwise.
- Thinking unequal shares are impossible — tenants in common can hold any proportion the deed specifies.
- Believing a co-tenant needs everyone’s consent to lease the property to an outsider — one co-tenant can lease the whole property alone (Swartzbaugh).
- Forgetting that partition is essentially guaranteed if co-tenants can’t agree — it cannot be permanently waived, only postponed for a limited time.
FAQ
Does California presume tenancy in common or joint tenancy for co-owners?
California presumes tenancy in common. Joint tenancy requires express language in the deed, such as “as joint tenants with right of survivorship.”
Can one tenant in common sell their share without the other’s permission?
Yes. Each co-tenant can independently sell, lease, or mortgage their own undivided share without needing consent from the other co-tenants.
What happens to a tenant in common’s share when they die?
It passes through their estate — by will or intestate succession — to their heirs or devisees, not automatically to the surviving co-tenants, since tenancy in common carries no right of survivorship.
Key Takeaways
- California presumes tenancy in common for concurrent owners absent express contrary language (Cal. Civil Code § 682).
- Each co-tenant holds an undivided interest and may occupy, sell, lease, or mortgage their own share independently.
- A co-tenant can lease the whole property to an outsider without consent; the remedy for the other co-tenant is an accounting, not eviction.
- Co-tenants owe each other contribution for taxes, mortgage payments, and necessary repairs.
- Any co-tenant can force a partition — physical division or, far more commonly, a court-ordered sale.
This article is educational and is not legal advice. Consult a licensed California attorney about your situation.
Related guides
- joint tenancy with right of survivorship in California
- tenancy by the entirety and California community property
- community property presumptions in California
- recording acts and bona fide purchasers