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Proposition 13, passed by California voters in 1978, is most famous for its impact on residential property taxes — capping assessed value increases at 2% per year and resetting assessment to market value only upon sale. What gets less attention is how Proposition 13 applies to commercial real estate, and the implications for businesses that own property or lease from owners who have recently acquired their buildings.
How Prop 13 Works for Commercial Property
The same rules apply to commercial and industrial property as to residential: assessed value is set at market value at the time of acquisition and can increase by no more than 2% per year thereafter, regardless of actual market appreciation. A commercial building acquired in 1995 for $2 million, in a market where similar buildings now trade for $15 million, is assessed at approximately $2.7 million (the 1995 value compounded at 2% for 30 years) — not at $15 million. The property tax on that building, at California’s 1% base rate, is approximately $27,000 per year. A comparable building that sold last year for $15 million pays $150,000 per year in property tax — more than five times as much.
The Long-Term Owner Advantage
This structure creates a significant competitive advantage for businesses that own their California real estate and have owned it for a long time. A manufacturer who bought their factory in 1990 pays a fraction of the property tax that a competitor who bought an equivalent facility in 2022 pays. This advantage is real and compounding — every year of appreciation without a sale widens the gap between the long-term owner’s tax burden and the market-rate tax burden.
For entrepreneurs buying California commercial real estate today, the property tax burden at current market values is substantially higher than it was for previous generations of business owners who bought the same type of property when prices were lower. Acquiring commercial real estate in California at today’s values means paying full property taxes on those values — which is straightforward in states with regular reassessment but is a market-rate burden in California that many existing owners avoid entirely.
Proposition 15 and What Didn’t Happen
California voters rejected Proposition 15 in November 2020 — a measure that would have required commercial properties valued over $3 million to be reassessed at market value regularly (effectively eliminating Prop 13 protection for commercial real estate above that threshold). The measure failed, preserving Prop 13’s protections for commercial property. But the political pressure for commercial property reassessment has not disappeared, and the issue is likely to return on future ballots. Business owners who benefit from Prop 13’s locked-in assessments should understand that this protection may not be permanent.
What This Means for Lease Negotiation
When a building sells, the property tax resets to full market value — and in most California commercial leases, property tax increases pass through to tenants under triple-net provisions. A tenant whose landlord sells the building during the lease term may face a significant property tax pass-through increase mid-lease — potentially tens of thousands of dollars per year that weren’t in the original budget. Understanding the landlord’s acquisition history and estimating property tax reset risk is a critical element of commercial lease due diligence that many small business tenants overlook until it’s too late.
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