Here is the assumption that costs Bankers Hill sellers real money every year: that Mills Act status is something you add to a historic home the way you'd refinish the floors before a showing. Decide to do it, hire the right people, get it done in time for spring listing season.

That is not how the calendar works. If you own a historically eligible home in Bankers Hill and you decide this month that you want Mills Act designation before you sell, the earliest a property tax contract could take effect is more than a year away. And by the time you get there, the program itself may look different from the one you researched today.

That gap between "decide" and "designated" is the part most explainers skip. It matters more in Bankers Hill than almost anywhere else in San Diego, because this is one of the few neighborhoods where a National Register historic district was just finalized, where architect-of-record homes by Irving Gill sit two blocks from a 1912 suspension bridge, and where the city is actively rewriting the rules that govern the tax incentive attached to all of it.

The two calendars you're actually working against

Mills Act contracts in San Diego run on a sequence, not a single application. A property has to be locally designated as a historic resource before its owner can even apply for the tax reduction. Designation and application are two separate steps handled at two separate times of year, and the city's own Mills Act page spells out the sequence plainly: applications are accepted only between January 1 and March 31 each year, and the property must already be historically designated on the local register by December 31 of the prior year to qualify for that window.

Read that again from a seller's perspective. If your home isn't designated yet and you start the process in June, you're not applying for a Mills Act contract this year. You're not applying next January either, because your designation won't be finalized by that December 31 cutoff. You're applying the January after that. In practice, a homeowner who decides mid-year to pursue Mills Act status is often looking at 18 to 24 months before a contract is in place.

That timeline changes the calculus for anyone trying to use Mills Act status as a selling point on a near-term listing. It cannot be manufactured on short notice. It has to already exist, or the seller has to be honest with buyers that it's still years out.

What's already locked in, and what isn't

The timing problem would be worth knowing on its own. It's more urgent right now because the rules Bankers Hill sellers are racing toward are themselves in motion.

On February 24, 2026, San Diego's City Council voted 5-1 to approve the first phase of a rewrite of the city's Heritage Preservation Program, its first comprehensive update in more than 25 years, according to KPBS. That first phase, known as Package A, gives the City Council new authority to review Historic Resources Board designations on their merits rather than only for procedural error, a change Council President Joe LaCava opposed, arguing at the time that he didn't see evidence it was "an important tool."

Package A didn't touch the Mills Act directly. Package B is expected to. According to reporting from Times of San Diego in April 2026, city staff confirmed the second phase was still being evaluated and would likely include updates to the Mills Act program aimed at "equitable and fiscally responsible implementation," along with changes to how buildings are automatically flagged for historic review once they turn 45 years old. The city's own Preservation and Progress page lists Mills Act reform as one of six explicit goals of the initiative.

As of this writing, Package B has not been finalized. No public hearing date, contract cap, or eligibility threshold has been formally adopted. That uncertainty is itself the point: a homeowner who begins the Mills Act process today, aiming for a designation deadline more than a year out, is applying for a program whose shape isn't fully settled.

Save Our Heritage Organisation, the preservation nonprofit that has tracked San Diego's Mills Act program for decades, has been blunt about the city's approach, and Mission Hills Heritage has organized against several of the proposed changes, including the shift toward giving the City Council final say over designations. Whatever side of that debate a homeowner falls on, the practical fact is the same: the rules a Bankers Hill seller is planning around today are not guaranteed to be the rules in place when their application window opens.

Two Bankers Hill properties, two different timelines

The stakes of getting this timing right show up clearly in two Bankers Hill properties.

The Heart of Bankers Hill Historic District, a 35-acre pocket bounded roughly by Front Street, Walnut Avenue, and the canyons that parallel Albatross, Brant, and Curlew Streets, was added to the National Register of Historic Places in October 2024 after a multi-year nomination process. The district includes 90 resources, 68 of them contributing, among them seven buildings designed by architect Irving J. Gill and his nephew Louis J. Gill, and the Spruce Street Suspension Bridge, a 375-foot pedestrian span built in 1912 that still connects the two halves of the neighborhood across Arroyo Canyon. Properties inside that district now carry a form of recognized historic status that many owners elsewhere in the city are still years from securing on their own.

Contrast that with the Broderick-Kenny House, an 1888 Victorian on the 2nd Avenue corridor that has carried Historic Landmark status since 1979. Preservationist Karen Groebli bought the home in 1997 for $188,500, when it was in enough disrepair that it had once been slated for demolition, and spent roughly eight years restoring it before recently returning it to the market at $4.5 million, according to reporting on the sale. That house didn't need to race a designation deadline. Its Mills Act eligibility, tied to a landmark status decades old, was already part of the story before the listing photos were taken.

Those two examples show the range. A district-wide designation like Heart of Bankers Hill lifts many properties at once, on the timeline the city sets. An individually designated landmark like the Broderick-Kenny House carries its status indefinitely, benefit and obligation both passing to whoever buys it next. What neither example offers is a shortcut for the owner who hasn't started the process yet.

What the tax math actually looks like

The city's Mills Act page puts the typical savings range at 20 to 70 percent off the property tax bill, calculated by valuing the home based on potential rental income rather than comparable sales. The size of that reduction depends heavily on when the home was purchased relative to current market value, since a property with a low Proposition 13 basis from decades of ownership may see little or no benefit from the switch to a rental-income formula.

To put a real number on what's at stake, Hernholm Group's own historic home information page uses a Mission Hills home the team sold on Hermosa Way in August 2022 for $4,250,000. At the city's 1.1 percent property tax rate, a home at that price would typically carry an annual tax bill near $47,000 without any Mills Act adjustment. A property at a comparable value in Bankers Hill, once under a Mills Act contract, could see that bill reduced substantially, though the exact figure depends entirely on the rental-value formula the county assessor applies to that specific property.

One detail worth knowing even for owners who wouldn't see a large tax reduction: a Mills Act contract can still add value to a sale, because it means the home won't be reassessed to full market value the way an uncontracted property would be after a transfer. For a buyer weighing two similar historic homes, one already under contract is often the more attractive purchase on tax grounds alone, independent of the seller's own savings.

A few questions worth asking before you apply

If I sell my home partway through a Mills Act contract, does the buyer keep the benefit? Yes. The contract runs with the land, not the owner. A buyer inherits both the tax benefit and the maintenance obligations that came with it, and does not need to reapply.

Can I market a home as "Mills Act eligible" if it isn't designated yet? Only carefully. Eligibility for designation isn't the same as an active contract, and buyers researching the property will find the actual designation status on the city's Historical Resources Register. It's worth being precise about where a property stands in the process rather than implying a benefit that hasn't been secured.

Does the pending Package B reform affect homes already under an existing Mills Act contract? That isn't yet clear. City staff have described the goal as making the program's future implementation more equitable and fiscally sound, but as of this writing no specific language has been adopted that addresses existing contracts versus new applications. Anyone with a contract already in place, or an application already filed, should watch the public hearing process directly rather than assume how it will land.

If you own a historically significant property in Bankers Hill and you're trying to figure out where it sits on this timeline, whether that means confirming an existing designation, understanding what a district listing like Heart of Bankers Hill means for your specific address, or deciding whether the calendar makes sense to start the process now, Hernholm Group has spent years working through exactly these questions with owners in this neighborhood. Get Access to Exclusive Listings and talk with us before you make a decision the calendar won't let you undo.