The estate at 3000 Ralston Avenue took six years to build. Its owners, private equity investor Ted Kruttschnitt and his wife Alexia, called it Villa de Verano and modeled it on the villas of Lake Como, with a 150-seat amphitheater, a sunken tennis court, a nine-hole golf course, an 18-hole putting green, a koi pond, and a 2,100-gallon saltwater aquarium spread across 12 acres. It hit the market this past February at $78.8 million, went into contract on July 24, 2026, and closed in early August at $70 million, the highest price ever paid for a home in Hillsborough and, according to listing agent Jenn Gilson, the highest Northern California home sale of 2026. It also exactly doubles the town's previous record of $35 million, set in 2022.
Back in May 2026, a separate market index was telling a very different story about Hillsborough. It showed the town's typical home value down 4.7% year over year, sitting at roughly $5.04 million.
Both numbers are accurate. Neither tells you much on its own. The real story in Hillsborough right now isn't whether prices are rising or falling. It's that the town sells so few homes in any given month that a single $70 million transaction, or the absence of one, can swing every headline statistic you'll find about this market. If you're pricing a listing or sizing up an offer here, the number that matters most isn't the median. It's how many sales that median is built on.
The Same Month, Three Different Markets
Pull Hillsborough data from a few sources and you get several different stories, sometimes for the same stretch of the calendar.
| Source | Reporting Window | Median Sale Price | Change vs. Prior Year |
|---|---|---|---|
| Redfin (town-wide) | 3 months ending May 2026 | $7.1M | +33.4% |
| Zillow (typical value index) | As of May 2026 | $5.04M | -4.7% |
| Hillsborough Heights submarket | 3 months ending April 2026 | $10.9M | +67.6% |
| Hillsborough Hills submarket | January 2026 | $5.2M | -21.1% |
Redfin's town-wide figure says prices jumped a third in a year. Zillow's index says they slipped. Neither is wrong. Redfin's number is a straight median of actual closed sales, so it moves with whatever happened to sell that quarter. Zillow's index tries to smooth for that by estimating a "typical" home rather than reporting the sales themselves, which is likely why it drifted the other direction.
Look at the submarket rows and the mechanism gets easier to see. Hillsborough Heights posted a 67.6% jump over the three months ending April 2026, and Redfin's own data for that pocket shows the total recorded home sale count behind it was two. Hillsborough Hills fell 21.1% in January 2026 on a single recorded sale. A neighborhood-level median built from one or two transactions isn't really a trend. It's a description of whatever two houses happened to close, and in a town where lot size and finish level vary as much as they do here, that description can look like a headline swing without reflecting anything about the broader market.
Town-wide, the picture is steadier: Redfin counted 39 Hillsborough homes sold in May 2026, up from 34 the same month a year earlier. Even that count is small enough that a handful of estate sales, especially anything in the eight-figure range, will move the average and median in ways that a bigger market like San Mateo or Redwood City would barely register.
Why the Sample Stays This Small
This isn't a temporary supply crunch. It's built into how the town is zoned. Hillsborough's subdivision rules generally require a minimum net lot area of 21,780 square feet, or roughly half an acre, along with about 150 feet of street frontage. That single rule has shaped the town's housing stock for decades: no small lots, no infill density, and very little room for the kind of incremental new construction that would otherwise add inventory in a normal year.
That fixed supply is now meeting a fresh wave of demand. Agents who toured buyers through the Ralston Avenue estate said the eventual purchaser works in the artificial intelligence industry, and coverage of the sale connected it to trends in Coldwell Banker's midyear 2026 Global Luxury Report, which found wealthy buyers increasingly competing for large, irreplaceable land parcels rather than typical high-end homes. When that kind of buyer meets a town that cannot add half-acre lots no matter how strong demand gets, the result isn't a gradual price increase. It's the kind of lumpy, headline-grabbing swing you see in the numbers above.
What the Ralston Avenue Sale Signals, and What It Doesn't
The sale is worth sitting with for what it tells buyers and sellers, not just as a headline. It confirms genuine, AI-driven demand for irreplaceable land in Hillsborough, and it shows that the town's price ceiling has moved. What it doesn't do is describe a typical Hillsborough transaction. A seller with a well-located home on a standard half-acre lot isn't in the same conversation as a 12-acre compound with its own amphitheater and golf course. Both sales, however, feed into the same town-wide median. A seller checking that number before setting a list price could easily overestimate what a more typical property will draw, and a buyer could assume competition is fiercer across the board than it actually is outside the very top tier.
The more grounded read comes from sale-to-list behavior rather than the median alone. For May 2026, Realtor.com described Hillsborough as a seller's market with a 100% sale-to-list ratio. Separate market-trend data covering recent quarters shows a wider split, with something in the range of 30% to 50% of homes selling above list price and the rest landing at or under. Read together, the two data points suggest a market that rewards a well-prepared, well-priced listing without guaranteeing a bidding war on every property that hits the market.
Two Things Worth Tracking This Year
Beyond the pricing data, two current developments will shape how Hillsborough functions for the next several months, and neither shows up in a median price chart.
The Tartan Trail Road Bridge closure. The Town is moving forward with an emergency repair of the Tartan Trail Road Bridge over San Mateo Creek, a route residents rely on for access into town. Once construction starts, there will be no through access between Tartan Trail Road and Crystal Springs Road for the duration of the project, currently expected to run through winter 2026, with detours routed via Crystal Springs Road, Skyline Boulevard, Golf Course Drive, Hayne Road, and Black Mountain Road. If you're evaluating a property near that corridor, factor the detour into your sense of day-to-day access, not just the drive time on a normal map.
The approved Housing Element. The Town recently received formal state approval of its Housing Element, which sets a target of 554 units under the state's Regional Housing Needs Allocation for the 2023-2031 cycle. The plan leans on accessory dwelling units and multi-unit housing built on town-owned land, and explicitly requires no rezoning of private property to meet the requirement. Practically, that means the half-acre minimum lot size isn't going anywhere. Whatever new housing capacity Hillsborough adds over the next several years will come from ADUs and public land, not from smaller subdivided lots entering the resale market. The scarcity behind today's volatile median is a policy choice as much as a geographic one, and it's set to continue.
What This Means If You're Buying or Selling Here
If you're selling, the town-wide median is close to useless for setting your price. What matters is the handful of genuinely comparable sales in your immediate pocket of Hillsborough, adjusted for the fact that even those comps might be built on one or two transactions rather than a real trend line. A pricing strategy here has to be built property by property, not pulled from a headline percentage.
If you're buying, the same logic cuts the other way. A quiet month with no eight-figure sales can make the market look softer than it is, and a single trophy closing like Ralston Avenue can make it look hotter than it is for a home nowhere near that price tier. The sale-to-list split, not the median, is the more honest gauge of where you actually have room to negotiate.
Common Questions
Why did Hillsborough Heights show a 67.6% price jump when the town overall only rose 33.4%? Because the Heights figure was calculated from two closed sales over that three-month window. A submarket that small doesn't produce a statistically meaningful trend. It reflects whichever two homes happened to sell, which can include very different property types and price points from one quarter to the next.
Is Hillsborough currently a buyer's market or a seller's market? It depends heavily on price tier. Realtor.com's May 2026 data called Hillsborough a seller's market with a 100% sale-to-list ratio, but broader sale-to-list figures over recent quarters show a meaningful share of homes selling at or under asking too. That points to real variation by property and price point rather than a market that uniformly favors either side.
Will the new Housing Element bring more homes onto the resale market? Not in the way that typically eases pricing pressure. The plan's units are concentrated in ADUs and development on town-owned land, and the half-acre minimum lot size for private property remains in place. That means the structural scarcity behind Hillsborough's small transaction counts is likely to persist.
Hillsborough rewards buyers and sellers who look past the headline number and into the specific comps, zoning, and access realities of a given property. If you want a read on your own street or a specific listing rather than a town-wide average, Sharlyne Murphy can walk you through what's actually comparable and what isn't. Get access to my private listings to see what's moving before it hits the broader market.
