In the second quarter of 2026, condos and townhomes across San Mateo County took nearly twice as long to sell as they had at the start of the year, with the median stretching from 29 days on market to 50. In almost any other market, that alone would be read as a clear signal: demand is softening, buyers are pulling back, sellers should expect to concede on price. Except condo prices in that same window were reportedly climbing, up roughly 12 percent year over year.

That is not how markets are supposed to behave. Slower sales and rising prices moving together usually means one of two things is being measured wrong, or one of two things is happening that a single headline number cannot capture. For a buyer trying to decide between a condo and a single-family home in San Mateo County right now, figuring out which one it is matters more than the topline stat itself.

The Composition Trap

Here is the mechanism that explains it. A median price does not track how much a specific type of home costs over time. It tracks the midpoint of whatever happened to close that month. If the mix of condos selling shifts toward larger units, view units, or newer buildings, the median rises even if no single unit got more expensive. If it shifts toward smaller, older stock, the median falls even in a hot market. Economists call this a composition effect, and it is easy to mistake for a price trend when you are only looking at one number a month.

San Mateo County's condo market is small enough that this effect shows up constantly. Single-family sales in the county ran to 438 closings in June 2026 alone, according to countywide MLS data for that month. Condos and townhomes, by contrast, close at a pace closer to 60 to 90 units a month across the entire county, spread across nearly 20 cities and towns from Daly City to Menlo Park. Divide that thin pool by city, and some places barely register. Redwood Shores saw fewer than 40 total home sales of any kind in all of 2025. In Burlingame and San Carlos, only 12 to 15 homes across all property types typically close in a given month. When your sample size for condos in a specific city might be five or six closings, one estate sale or one investor-owned two-bedroom can swing the median several percentage points in either direction. That is not demand shifting. That is arithmetic.

What a Full Year Looked Like Compared to One Quarter

The clearest evidence that this is a volume problem rather than a demand problem comes from comparing time frames. The county assessor's office, in its annual report on the 2026-27 property assessment roll, noted that across all of calendar year 2025, the single-family median rose a modest 1.5 percent to $1,980,000, while the condo median actually slipped 0.7 percent, from $915,000 down to $909,000, with condo sales volume falling nearly 4 percent year over year.

Set that beside the quarter-over-quarter story from Q2 2026, where condo prices were reportedly up 12 percent even as days on market nearly doubled. Same county, same broad property type, two very different stories depending on which window you look through. Neither number is wrong. Both are measuring a market too thin to produce a stable trend line from month to month, which is exactly why a single condo median should never be the number a buyer plans a budget around.

Here is what the current snapshot actually shows, based on countywide data through June 2026:

The single-family column is built on a large enough sample that month-to-month swings mean something. The condo column is thinner, and the days-on-market jump is the more trustworthy signal of the two, because it reflects how long individual listings actually sat, not a blended price across a small and shifting group of closings.

Why This Matters Once You Are Actually Bidding

A buyer who reads "condo prices up 12 percent" and concludes they need to move immediately to beat rising costs is reacting to a number that may not describe the unit they are looking at. A buyer who reads "days on market nearly doubled" and assumes sellers are desperate to negotiate may also be wrong, because a longer time on market in a thin submarket can just as easily reflect a building with a pending litigation issue or an overpriced listing as it can a genuine drop in demand.

One spring 2026 sale in San Bruno makes the second point concretely. A home listed just above $2.1 million ultimately sold for $1.84 million after 57 days on market, nearly five times the city's 12-day median at the time. The gap wasn't a soft market. It was a listing priced ahead of what recent comparable sales supported, and buyers who track new inventory closely simply waited it out.

The price-per-square-foot gap is the other number worth sitting with. At $1,235 per square foot for single-family homes versus $745 for condos as of June 2026, the same budget buys roughly two-thirds more square footage in an attached home than a detached one. That gap is real and durable in a way the monthly condo median is not, because it is drawn from a much larger sample on the single-family side and reflects genuine differences in land, structure type, and buyer competition rather than the composition of whichever handful of units happened to close last month.

What to Actually Do With This

If you're comparing a condo purchase against a house in San Mateo County right now, treat the county-level condo median as background noise rather than a planning number. Instead:

• Ask your agent for the last three to six closed sales in the specific building or complex you're considering, not the citywide or countywide condo average.
• Compare the listing's price per square foot to those recent building-specific comps, not to the countywide $745 figure, which blends everything from a 1960s two-bedroom to a new Redwood Shores townhome.
• If a condo has sat on market well past the current 50-day norm, ask why before assuming it means a discount is coming. It may point to a pricing issue you can negotiate around, or it may point to something in the building's finances or governance worth investigating separately.
• Recognize that in a market this thin, patience genuinely pays off in identifying the right unit, but readiness to act fast once it appears matters just as much. Both can be true in a market defined by scarcity rather than by a single trend.

The single-family market in San Mateo County is large enough that its monthly numbers describe something real. The condo market, city by city, is often too small to trust the same way. Reading the difference correctly is the actual skill here, more than memorizing whichever median happened to print last month.

If you're weighing a condo against a house in San Mateo County and want someone to pull the specific comps for the building or block you're actually considering, Dapkus Real Estate Team can walk through what the numbers mean for your situation, not just what they say at the county level.

Frequently Asked Questions

Does a rising countywide condo median mean I'll pay more for any condo I look at? Not necessarily. A countywide median can rise because more expensive units happened to sell that month, without any single condo getting more expensive. Ask for comps from the specific building or complex before assuming the trend applies to your target unit.

Why do single-family price trends seem more reliable than condo trends? Volume. Single-family sales in San Mateo County ran to 438 closings in June 2026 alone, while condos closed at a pace of roughly 60 to 90 a month across the entire county. A larger sample averages out the noise that a thin one cannot.

Is the condo market in San Mateo County heating up or cooling down? Both signals showed up at once in Q2 2026: reportedly higher prices alongside days on market nearly doubling. That combination is more consistent with a small, shifting pool of closings than with a clean read on buyer demand, which is exactly why the building-level comps matter more than the county-level headline.