Hillsborough Luxury Real Estate Market 2026: What Sellers Need to Know

Pull up three different snapshots of the Hillsborough market this year and you'll get three different answers to the same question: how fast do homes actually sell here? In January, one source put the median days on market at roughly 80. By April, another read on the same town showed a median of just 7 days. By May, a third put it at 36. Same town, same year, three numbers that don't agree with each other by a factor of ten.

If you're getting ready to list an estate in Hillsborough this fall, that spread isn't a footnote. It's the first problem you have to solve, because it changes how you set expectations for your own timeline, and no single monthly snapshot is going to answer it for you.

Why The Same Town Produces Wildly Different Stories

The spread isn't a data error. It's what happens when a market this small gets measured month by month. Hillsborough closes single-digit to low-double-digit sales most months. One recent snapshot counted 15 closed single-family sales in April, another counted 39 sold in May. When your entire sample is that thin, a handful of transactions can swing the median hard in either direction depending on what happened to sell.

If three modest remodels close in a slow week, the median days on market looks fast and the price looks moderate. If a single sprawling estate that sat with the right buyer for months finally closes alongside a fast-moving smaller home, the blended number can look almost anything. This is different from Redwood City or San Mateo, where hundreds of monthly closings smooth out the noise. In Hillsborough, the noise is the story until you know how to read past it.

The Sale That Actually Broke The Pattern

This year gave Hillsborough sellers a real example of how far the noise can swing. A 12-acre estate at 3000 Ralston Avenue, known as Villa de Verano and built with a design inspired by Lake Como, went into contract this summer with an asking price of $78.8 million. According to reporting from the San Francisco Standard, the seller wasn't willing to go below $70 million, and the buyer touring the property worked in the artificial intelligence industry.

When the sale closed, ABC7 reported it landed at $70 million, the highest price ever recorded in Hillsborough and the highest Northern California home sale of the year. That figure doesn't just beat the previous town record. It doubles it. The prior high water mark was $35 million, set in 2022.

The same listing agent, Jenn Gilson, also holds a separate $40 million Hillsborough listing on 5 acres that was once the long-time home of Bing Crosby and his wife Kathryn. Two estates, two very different histories, both priced well above anything most Hillsborough sellers will ever list. That's the point. A single closing at this level can distort a monthly median so badly that reading the town's "average" performance from it tells you almost nothing about how a $4 million or $6 million listing will actually behave.

The Scarcity Behind Both The Volatility And The Record

None of this happens by accident. Hillsborough's minimum lot size has been one-half acre since 1953, and it hasn't moved since. The town also holds 259 acres of open space that cannot be developed or sold under any circumstance. Add to that a housing plan that meets most of its state-mandated growth targets through accessory dwelling units rather than new subdivisions, and you get a town where the number of large, usable, private parcels has been essentially fixed for seven decades.

That scarcity is invisible in a typical year. It becomes the whole story the moment a wave of new money, this year concentrated in the AI sector, competes for the same handful of irreplaceable large-lot estates. Coldwell Banker's midyear Global Luxury Report has flagged exactly this pattern across ultra-high-net-worth buyers nationally, describing a sharp rise in demand for large land parcels and one-of-a-kind properties that can't be replicated. Hillsborough, with a fixed inventory of exactly that kind of land, sits squarely in the path of that demand.

There's a wrinkle worth knowing if you own or are considering a large parcel. California's SB9 technically allows any single-family lot in the state to be split into two, regardless of local minimum lot size rules, starting January 1, 2022. Hillsborough responded before that deadline by adopting its own objective development standards for building size, setbacks, and height, layered on top of whatever SB9 requires. In practice, the half-acre character of the town has held. If you're evaluating a large lot with subdivision potential, or worried a neighboring parcel could be split, that's a conversation worth having with someone who tracks how the town has actually applied these rules, not just what the state law technically allows.

Two Markets Wearing One Name

Here's the part that matters most if you're actually selling. "Hillsborough" isn't one market this year. It's two, and they behave differently.

At the very top, a small number of buyers with AI-sector wealth are chasing irreplaceable large parcels and willing to pay records to get them. That tier moves on its own logic: privacy, acreage, architectural pedigree, and scarcity drive the price, and comparable sales are so rare that pricing strategy looks more like art appraisal than a spreadsheet exercise.

Below that tier, the more typical Hillsborough transaction looks calmer and more negotiable than the headlines suggest. One recent read of MLS-sourced sales data found that roughly 30 to 50 percent of Hillsborough homes sell over list price, with an average sale-to-list ratio between about 98 and 102 percent. That's a market with real demand, but not one where every seller can assume a bidding war. Buyers in this band still have room to negotiate on price, timeline, and repair requests in a meaningful share of transactions.

The table below shows how differently the same town has read across recent months, and why no single number should anchor your pricing strategy.

Read any one row in isolation and you'd draw a confident, and probably wrong, conclusion about how fast your home will sell or what it will fetch. Read all four together and the real pattern shows up: small sample sizes, a handful of very large closings, and a market that behaves differently depending on which price band you're actually in.

What This Means If You're Listing This Fall

If your home sits in the $3 million to $6 million range, the more useful comparison isn't the Ralston Avenue sale. It's other homes in your band that closed in the last six to twelve months, adjusted for lot usability, privacy, slope, and how much of the property is flat, buildable land versus hillside. That's the segment where the sale-to-list data suggests real negotiating room still exists on both sides.

If you're sitting on a genuinely irreplaceable parcel, acreage, view corridor, or architectural pedigree that can't be found twice, you're playing in the tier where this year's record sale actually applies. That market moves on relationships, discretion, and access to the small pool of buyers who can transact at that level, not on a monthly median pulled from a portal.

Either way, the lesson from this year's numbers isn't that Hillsborough is suddenly moving faster or slower. It's that a town this small, with a supply of large lots that hasn't grown since 1953, will keep producing headline numbers that don't describe your listing unless you know which tier you're actually in.

A Few Questions Worth Asking Before You List

Does the record sale mean my Hillsborough home is worth more now? Not directly. A record set by a 12-acre, architecturally singular estate with global buyer interest doesn't move the value of a more typical lot the way it might in a larger, more liquid market. Your comps should come from homes genuinely similar to yours in lot size, usability, and condition.

Could my lot be split under SB9? Technically SB9 applies statewide, but Hillsborough adopted its own objective standards ahead of the law taking effect, and the town's half-acre character has held since. If you own a large parcel and want clarity on how the rules apply to your specific lot, that's worth a direct conversation rather than a general answer.

Why do days-on-market figures for Hillsborough vary so much between sources? Because the town closes so few sales each month that the mix of what happens to sell, whether that's a fast-moving remodel or a slow-moving trophy estate, can swing the median dramatically from one snapshot to the next. Look at multiple months and multiple sources before drawing conclusions.

If you're weighing a listing in Hillsborough this fall and want a pricing conversation built around your specific lot, comps, and price band rather than a headline number, LeDoux Group can walk through what the current data actually means for your home. Request Your Free Home Valuation to start that conversation.