A change in ownership, whether a direct sale or an entity level transfer, triggers a full reassessment to current market value. Understanding the rules can save you from a costly surprise.

Change in ownership property tax reassessment rules are among the most consequential and most misunderstood aspects of California property tax law. Under Proposition 13, your commercial property is protected from reassessment as long as you hold it. But the moment a change in ownership occurs, the assessor resets your base year value to current market value, potentially adding tens of thousands of dollars to your annual tax bill overnight.

The challenge is that change in ownership does not just mean selling the property. It also applies to transfers of interests in legal entities, including LLCs, corporations, partnerships, and trusts, that own real property. And the rules are cumulative, meaning multiple small transfers over time can combine to trigger reassessment even if no single transaction exceeded the threshold.

This guide explains how change in ownership property tax reassessment works in California, the key exclusions that can protect you, and what to do if you believe a reassessment was triggered incorrectly.

What Is a Change in Ownership Under California Law?

California Revenue and Taxation Code Section 60 defines a change in ownership as a transfer of a present interest in real property, including its beneficial use, the value of which is substantially equal to the value of the fee interest.

In plain terms: if you transfer the effective ownership of a property, or the effective control of an entity that owns a property, you have triggered a change in ownership and the property must be reassessed to current fair market value.

The definition is intentionally broad. California courts and the Board of Equalization have consistently interpreted it to capture not just direct property transfers, but also indirect transfers through legal entities. The goal is to prevent property owners from avoiding reassessment simply by holding property in an LLC or corporation and transferring interests in the entity rather than the property itself.

For a broader overview of all reassessment triggers, see our guide on what triggers property tax reassessment in California.

Change in Ownership Reassessment: Direct Property Transfers

The most straightforward change in ownership is an outright sale or transfer of the real property itself. When a commercial property is sold, the purchase price is enrolled as the new base year value, and the new owner's Proposition 13 clock starts from that point.

Key rules for direct transfers:

• The full cash value, typically the purchase price in an arm's length transaction, becomes the new base year value
• The reassessment date is the date of transfer, meaning close of escrow, not the recording date
• A supplemental assessment is issued for the period from the transfer date to the end of the fiscal year, in addition to the regular annual bill
• Transfers by gift, inheritance, or sale that is not at arm's length are still change in ownership events, but the assessor must independently determine fair market value rather than relying on the transfer price

For buyers, this means modeling the post reassessment tax liability is an essential part of acquisition due diligence. A $15 million commercial property purchase in a county with a 1.2% effective tax rate generates a $180,000 annual tax obligation, which may be dramatically higher than what the seller was paying on a decades old assessed value.

Entity Level Transfers and the 50% Rule

This is where many commercial property owners are caught off guard. California law extends change in ownership rules to legal entities, including LLCs, corporations, partnerships, and trusts, that own real property.

The 50% Cumulative Rule

Under California Revenue and Taxation Code Section 64, a change in ownership of real property owned by a legal entity occurs when more than 50% of the ownership interests in that entity change hands, whether in a single transaction or cumulatively over time.

This is called a change in control, and it triggers reassessment of all real property owned by the entity.

How the 50% threshold works in practice:

The threshold is measured cumulatively from the date the entity originally acquired the property, or the date of the last change in ownership that triggered reassessment. Here is an example:

In this scenario, the second transaction triggers reassessment even though it only transferred 25% of the entity. The cumulative total of 55% crosses the 50% threshold, and the entire property is reassessed to current market value.

Important: The 50% threshold applies to the original ownership interest, not the current ownership. If the entity has already had one change in control, and therefore one reassessment, the clock resets and the 50% threshold is measured from that point forward.

What Counts as an Ownership Interest?

For LLCs and partnerships, ownership interests include membership interests and partnership interests. For corporations, ownership interests include stock. For trusts, the analysis is more complex and depends on the nature of the beneficial interest.

The assessor looks through the legal form to the economic reality: who controls the entity, and who benefits from the property? Transfers of economic interests, even without a formal transfer of legal title, can trigger reassessment.

Multi Tier Entity Structures

California's change in ownership rules apply to multi tier entity structures as well. If a parent entity owns a subsidiary that owns real property, a change in control of the parent entity can trigger reassessment of the property owned by the subsidiary.

This is a critical planning consideration for institutional investors, private equity firms, and family offices that hold California commercial real estate through complex entity structures. A fund level transaction, such as a sale of interests in a fund that owns California properties, can trigger reassessment of those properties even if the properties themselves are never directly transferred.

Key Exclusions from Change in Ownership Reassessment

California law provides a number of important exclusions from change in ownership reassessment. These exclusions are not automatic. You must file a claim with the county assessor to qualify, and most have strict filing deadlines.

Proportional Transfer Exclusion

The most important exclusion for commercial property owners is the proportional transfer exclusion under Revenue and Taxation Code Section 62(a)(2). A transfer of interests in a legal entity is excluded from change in ownership if both of the following are true:

• The transfer results in the same proportional ownership interests among all owners
• The transfer does not change the identity of the persons who hold the controlling interest

This exclusion is commonly used in corporate restructurings, entity conversions such as converting an LLC to a corporation, and estate planning transactions where the goal is to change the legal form of ownership without changing who actually owns the property.

Example: An LLC with three equal partners, each holding 33.3%, converts to a corporation, with each partner receiving 33.3% of the stock. Because the proportional ownership interests are unchanged, the conversion is excluded from reassessment.

Interspousal and Domestic Partner Transfers

Transfers of real property between spouses or registered domestic partners are excluded from change in ownership. This exclusion applies to:

• Transfers incident to a marriage or domestic partnership
• Transfers between spouses during marriage
• Transfers pursuant to a divorce or legal separation, including division of community property

Corporate Reorganization Exclusion

Certain corporate reorganizations, including mergers, acquisitions, and restructurings that qualify under Revenue and Taxation Code Section 62(a)(1), are excluded from reassessment if there is no change in the proportional ownership interests of the persons who ultimately own the real property.

This exclusion requires careful analysis. Not all corporate reorganizations qualify, and the Board of Equalization has issued detailed guidance on what constitutes a qualifying reorganization.

Legal Entity to Original Transferor

Under Revenue and Taxation Code Section 62(a)(2), a transfer of real property from a legal entity back to the original transferor is excluded from reassessment, provided the original transferor retains the same proportional interest in the property.

Trusts

Transfers into a revocable trust by the trustor are generally excluded from reassessment, as the trustor retains the right to revoke the trust and reclaim the property. Transfers from a revocable trust to the trustor are similarly excluded.

Transfers into irrevocable trusts require more careful analysis. The key question is whether the transfer constitutes a change in the beneficial ownership of the property.

Filing Exclusion Claims: Deadlines and Procedures

Most change in ownership exclusions require a timely claim filed with the county assessor. The general rule is that exclusion claims must be filed within three years of the date of the transaction, or by the date of the first notice of supplemental or escape assessment, whichever is earlier.

Missing the deadline can result in losing the exclusion permanently for that transaction. If you have recently completed a transaction that may qualify for an exclusion, file the claim promptly rather than waiting until you receive a reassessment notice.

The relevant forms are:

What to Do If You Receive a Reassessment Notice After a Change in Ownership

If you receive a supplemental assessment or a notice of reassessment following a transaction, you have several options:

1. Verify that a change in ownership actually occurred. Review the transaction against the exclusions listed above. If an exclusion applies, file the appropriate claim with the county assessor immediately.

2. Challenge the enrolled value. Even if the reassessment was correctly triggered, the enrolled value may be higher than the property's actual fair market value as of the date of the change in ownership. You have the right to appeal the enrolled value to the county Assessment Appeals Board.

3. File a formal appeal. If the assessor denies your exclusion claim, or you believe the enrolled value is too high, file a formal appeal with the Assessment Appeals Board. The filing deadline is typically within 60 days of the notice of assessment, or within the regular filing window of July 2 through November 30, whichever is later.

For a full walkthrough of the appeal process, see our complete guide to commercial property tax appeals in California.

Planning Ahead: Minimizing Reassessment Exposure

The best time to address change in ownership reassessment risk is before a transaction closes. Here are the key strategies:

Track cumulative ownership transfers. If you are selling partial interests in an entity that owns California commercial property, maintain a running tally of cumulative ownership changes against the 50% threshold. Work with a tax attorney to structure transactions to stay below the threshold.

Use the proportional transfer exclusion in restructurings. When reorganizing ownership structures, ensure that all transfers qualify for the proportional transfer exclusion by maintaining each owner's proportional interest.

File BOE-100-B annually. All legal entities that own California real property with a total value of $100,000 or more are required to file Form BOE-100-B annually. This form discloses ownership changes and helps the assessor track cumulative transfers. Failing to file can result in penalties and escape assessments.

Consult a tax attorney before major transactions. Change in ownership analysis is complex, particularly for multi tier entity structures and institutional transactions. The cost of a pre transaction legal review is almost always less than the cost of an unexpected reassessment.

Appeal if the enrolled value is too high. Even when reassessment is correctly triggered, the enrolled value may exceed fair market value, especially in a declining market or for a property with above market vacancy. Always compare the enrolled value to current market conditions and appeal if there is a discrepancy.

For more on the California property tax law framework that governs these rules, see our California property tax law guide for commercial property.

Frequently Asked Questions

What is a change in ownership for California property tax purposes?

A change in ownership is a transfer of a present interest in real property, or a transfer of more than 50% of the ownership interests in a legal entity that owns real property, that triggers reassessment to current fair market value under Proposition 13.

Does transferring property to an LLC trigger reassessment in California?

It depends on the proportional ownership. If you transfer property to an LLC where you retain the same proportional ownership interest, the transfer qualifies for the proportional transfer exclusion and does not trigger reassessment. If the transfer changes the proportional ownership, reassessment may be triggered. Always file the appropriate exclusion claim with the county assessor.

How does the 50% cumulative rule work for LLCs?

Reassessment is triggered when more than 50% of the ownership interests in an LLC that owns California real property change hands, measured cumulatively from the date the LLC originally acquired the property. Even if no single transaction exceeds 50%, multiple smaller transactions can combine to cross the threshold.

Does adding a partner to an LLC trigger reassessment?

Potentially. If the new partner acquires more than 50% of the LLC, or if the new transfer pushes the cumulative total above 50%, reassessment is triggered. Transfers that keep the cumulative total below 50% do not trigger reassessment on their own.

What is Form BOE-100-B and who must file it?

Form BOE-100-B is the Statement of Change in Control and Ownership of Legal Entities. It must be filed annually by all legal entities that own California real property with a total value of $100,000 or more. The form discloses ownership changes and helps the assessor track cumulative transfers for change in ownership purposes.

Can I appeal a reassessment triggered by a change in ownership?

Yes. Even when reassessment is correctly triggered, you have the right to appeal the enrolled value to the county Assessment Appeals Board if you believe it exceeds the property's fair market value as of the date of the change in ownership.

Sources: California Revenue and Taxation Code sections 60 to 68 · California State Board of Equalization, Change in Ownership: General Information · California State Board of Equalization, Change in Ownership General Information page · California State Board of Equalization, Legal Entity Ownership Program