The Mills Act is a California program that lets owners of qualified historic properties enter a contract with their city or county in exchange for a property-tax assessment based on the cost of maintaining the home. For the right buyer it can be meaningful, but it comes with restrictions, paperwork, and renewal obligations that ride with the property.
The Mills Act is a voluntary historic-preservation contract between a property owner and a local government. In exchange for agreeing to maintain and preserve a designated historic property, the owner may receive a property-tax reduction calculated under a special assessment formula. The exact savings, eligibility, and obligations are set by each city or county and the specific contract — never assume a number. Verify the parcel's status and any active contract with the local landmarks or planning office, and confirm tax impact with a CPA or the county assessor.
Information current as of 2026. Approximate values: Simi Valley median ~$850K, Valencia ~$925K; rates ~6.5–7.0% — verify current figures.What this property situation means
A Mills Act contract is typically a 10-year, automatically renewing agreement that obligates the owner to preserve and, where needed, restore the property using appropriate standards. In return, the assessor re-values the property under a capitalization-of-income method rather than standard market value, which can lower the tax base. Not every old home qualifies — the property usually must be a designated local landmark or contributor to a historic district, and each jurisdiction decides whether it participates in the program at all.
General education, not legal or tax advice. Programs and overlays described here are real regulatory categories, but eligibility and status are parcel-specific. Verify any property's actual status with the city, county, CAL FIRE, FEMA, or the relevant agency, and confirm tax and legal impacts with a licensed attorney, CPA, or qualified professional before acting.
Due-diligence steps Brian walks you through
Adapt this to the specific parcel, and verify each item with the source agency or a licensed professional.
- Confirm in writing whether the property carries a historic designation (local landmark, district contributor, or register listing) with the city planning or preservation office.
- Ask whether the jurisdiction participates in the Mills Act and whether an active contract already exists on the parcel.
- Request a copy of any existing Mills Act contract and its preservation plan, including the maintenance and rehabilitation schedule.
- Have the county assessor or your CPA explain the current and projected assessed value — do not rely on a quoted percentage.
- Review what alterations are restricted and what approvals (Certificate of Appropriateness) future work would require.
- Order specialty inspections appropriate to an older structure (foundation, electrical, plumbing, roof, lead/asbestos awareness).
- Confirm insurability and get replacement-cost guidance, since historic features can affect coverage.
Disclosures and documents to watch
In general terms, expect attention to:
- Existence and terms of any recorded Mills Act contract that transfers with the property.
- Required preservation/maintenance plan and the owner's obligations under it.
- Any open code-enforcement, permit, or unpermitted-work issues on an older structure.
- Standard California disclosures (Transfer Disclosure Statement, Natural Hazard Disclosure, lead-based paint for pre-1978 homes).
- Whether prior alterations followed required historic-review approvals.
Who to involve
A Mills Act purchase usually benefits from a team: the city or county preservation/planning office (designation and contract status), the county assessor or a CPA (the actual tax picture), a real estate attorney (the recorded contract and obligations), and inspectors experienced with older homes. Brian coordinates the introductions and keeps the timeline on track so nothing is discovered late.
What it means locally
Qualifying Mills Act properties are relatively uncommon in newer suburban tracts and concentrate where there is older or designated housing stock. Whether a specific property qualifies depends entirely on its designation and the local government's program. Brian verifies the facts for your exact parcel rather than assuming.
How Brian guides buyers and sellers
Brian's role is to help you understand what you're buying or selling before you're committed. For buyers, that means surfacing the designation and any Mills Act contract early, building inspection contingencies that fit an older home, and connecting you with the right preservation and tax professionals. For sellers, it means gathering the contract and preservation-plan documents up front so the listing is transparent and the deal doesn't fall apart in escrow.
Brian serves all buyers and sellers equally and welcomes everyone regardless of race, color, religion, national origin, sex, familial status, disability, or any other protected class, consistent with the Fair Housing Act. The guidance here is about a property's status, never about who should or should not live anywhere.
Frequently Asked Questions
Does every old house qualify for the Mills Act?
No. The property generally must carry a historic designation, and the city or county must participate in the program. Many older homes are not designated and do not qualify. Verify with the local preservation or planning office.
How much will I save on property taxes?
There is no fixed percentage. Savings depend on the assessor's special income-based valuation for that specific property and contract. Ask the county assessor or a CPA for an estimate tied to the actual parcel.
Does a Mills Act contract transfer to me as the new owner?
Typically yes. Mills Act contracts generally run with the property and the new owner assumes the preservation obligations. Always obtain and review the recorded contract before closing.
Can I remodel a Mills Act property?
Work usually must follow preservation standards and may require approvals such as a Certificate of Appropriateness. Confirm restrictions with the jurisdiction before planning any changes.
Is the Mills Act available everywhere in California?
No. It is a local-option program — each city or county decides whether to offer it. Confirm participation with the specific jurisdiction where the property is located.
Can Brian help me find or sell a Mills Act property?
Yes. Brian helps buyers and sellers identify designation status, gather contract documents, build appropriate contingencies, and bring in preservation and tax professionals. This is general guidance, not legal or tax advice.
