The ten-year plan for 576 Patchett Street included foundation work. It also put a swimming pool in year eight and a detached ADU in years nine and ten. On October 6, 2026, the Napa City Council approved the contract on one condition. City staff had to get a revised plan from the owner that covers only maintenance tied to historic preservation before the contract could be finalized.
That condition matters to anyone shopping for an older home around Downtown Napa. A Mills Act contract binds every later owner of the property. So the work plan behind the tax break transfers with the deed, and in 2026 the city put that plan under closer review than the house.
What Changes Hands at Closing
California's Mills Act statute gives the new owner, as a successor in interest, the same rights and obligations the original owner signed up for. It also requires an inspection before a new agreement and every five years after that. In Napa, each application comes with a Ten-Year Plan for preserving, maintaining, restoring or rehabilitating the property. When a contracted house sells in, say, year four, the buyer takes over years five through ten of someone else's schedule.
Four terms in the statute set the stakes:
- Term. The minimum is ten years, and the contract renews automatically each year unless one side gives notice of nonrenewal.
- Exit. After a nonrenewal notice, the contract stays in force for the rest of its current term. The owner must give notice at least 90 days before the renewal date, and the city at least 60 days before.
- Breach. If the city cancels for breach, the law sets a cancellation fee of 12.5% of the property's current fair market value, figured as if the restriction did not exist.
- Tax math. The California Office of Historic Preservation explains that Mills Act properties are valued by the income approach instead of the usual market approach, and that assessors redo the figure every year, so the tax bill can move.
The cancellation fee is the number to keep in mind. On a vintage Napa home, 12.5% of market value is far more than the tax savings any contract is likely to produce. That makes the plan's remaining items a real commitment for whoever owns the house next.
How Large the Break Can Be
Napa's published numbers show what the trade is worth. In a 2023 estimate for a home at 409 Franklin Street, city staff put the current annual property tax at $5,064. Assessed-value reductions of 40% to 70% would bring that bill down to between $3,039 and $1,519 a year. That is a modeled projection for one property. It is not a guarantee, and it is not a realized figure.
The program is small. A November 2025 city staff report counted 16 active Mills Act properties in Napa for 2025, using Napa County Assessor's Office data: eleven residential, four commercial and one hospitality. With that few contracts citywide, any single one is a rare feature in a listing. For the same reason, a buyer has few comparable sales to judge how a contract affects price.
The 2026 Round, Address by Address
This year's round was large for a program that size. The Cultural Heritage Commission took up nine applications on September 10, 2026. The city's September 24 hearing notice sent eight of them to the City Council for October 6. The outcomes below come from the city documents and from meeting summaries published by Locunity and Open Publica.
| Property | Historic context | Status as of early November 2026 |
|---|---|---|
| 1516 Third Street, the Lovejoy Mansion | Stick-Eastlake Victorian, built around 1885; Local Landmark | Approved by Council |
| 1907 Spencer Street | Queen Anne cottage; contributor to Spencer's Addition potential district | Approved by Council |
| 1340 F Street | Plan includes restoration work on the water tower | Approved by Council |
| 1031 Vallejo Street | Contributor to the St. John's Historic District | Approved by Council |
| 362 Jefferson Street | Described to the commission as in excellent condition | Approved by Council |
| 617 Wilson Street, former Silverado Ballet School | Contributor to the Napa Abajo-Fuller Park National Register District | Approved by Council |
| 333 Randolph Street | On the city's Historic Resources Inventory | Approved by Council |
| 576 Patchett Street | Plan included a pool and detached ADU | Approved on condition of a revised plan |
| 1423 Seminary Street | Plan described as vague by commissioners | Continued to the November 12 commission meeting |
The Lovejoy Mansion shows that the plan covers more than the facade. The house now contains eight residential units. Its plan lists front porch repairs, exterior repainting, landscaping, driveway work and limited improvements to the units, and staff noted clear signs of deferred maintenance. A buyer of that building would be buying a list of dated obligations along with it.
Two Plans Sent Back, for Opposite Reasons
The two plans that did not go straight through had opposite problems. One promised too little and the other promised too much.
According to the Open Publica summary of the September 10 meeting, commissioners criticized the non-historic windows at 1423 Seminary Street and a plan that read "maintain as necessary." They continued the item so staff could work with the applicant on a revised plan that includes replacing the windows. At the same meeting, the commission accepted the Patchett Street pool as a property enhancement and recommended that contract 5-0.
The Council saw the pool differently. Locunity's account of the October 6 meeting quotes Councilmember Mary Luros:
"I don't think a pool and an ADU is the same as that preservation work that other homeowners are doing that would justify a public subsidy."
Locunity also reported that city staff told the Council the benefit is not tied to specific projects and that no policy bars that kind of work. Councilmember Beth Painter moved to approve the contract with the revised-plan condition, Luros seconded, and Mayor Scott Sedgley declared that it passed unanimously. The written rules did not change. What changed is that future applicants now know the Council will look at amenities in a plan. That guidance is informal, but it is public.
This affects buyers in two ways. First, a plan with specific, dated preservation items is now the kind of plan that gets approved. Inherited contracts from this round will tend to come with concrete work attached. Second, the Patchett contract was still waiting on a revised plan when the Council acted, and the Seminary application returns to the commission on November 12. Anyone looking at either house should get the final recorded version of its plan, not the draft attached to a staff report.
Where the Contract Meets Everything Else
A Mills Act contract is one layer of local review, and other rules apply alongside it. The commission's 2026 staff report says any restoration or reconstruction proposed with a contract is still subject to the Historic Preservation Ordinance and may require a Certificate of Appropriateness from the commission. Napa's historic preservation code defines a "major alteration" to include removing or replacing more than 30% of the combined square footage of a historic resource's exterior architectural features, or removing any part visible from a public way. So exterior work listed in a ten-year plan, such as the window replacement the commission requested at Seminary Street, may also come under that separate review.
Eligibility depends on the city's list. The Historic Resources Inventory posted by the city is dated January 14, 2016. State law limits the program to privately owned, taxable property on a federal register or an official state, city or county historic register.
The calendar is fixed. The city's application packet, revised March 17, 2026, accepts applications through July 31 each year. The commission typically hears them in September, the Council in October, and the contract is recorded with the County before year-end. A contract has to be approved and recorded by the end of the calendar year to count for the next tax year's assessment. The packet requires a ten-year improvement plan, a preliminary title report no older than 90 days, mailing labels for owners within 500 feet and a scaled site plan. Applications go to the Planning Division at 1600 First Street. A buyer who closes on an eligible, uncontracted house this winter would be applying in the 2027 window.
Short Answers
What does state law say about ending a contract? The statute provides for nonrenewal notice. After notice, the contract runs out over the rest of its current term. City staff have described the tax reduction as ending when that remaining term expires.
Does the tax bill stay fixed? No. Under the income approach the assessor sets the value again every year.
Who checks the work? State law requires inspections before a new agreement and every five years after. Napa staff describe the city as monitoring compliance.
This post is general information, not legal or tax advice. Before you rely on any contract's terms, confirm how they apply to a specific property with a real estate attorney or tax professional.
If you are weighing a vintage home in Fuller Park, St. John's or Spencer's Addition, or preparing to sell one with a contract already recorded, the ten-year plan belongs in the conversation from the first showing. Joe Brasil can help you read a historic property's obligations alongside its price, then start with a free home valuation that accounts for both.
