What happens to a downtown's home price premium when the workers it was built for haven't shown up yet? San Carlos is running that experiment right now, and the numbers on both sides of the ledger are public.
The city has been entitling life science construction on its east side for years, and the pace has not slowed. Back in 2023, the Planning Commission signed off on a 105,416 square foot office and research lab building at 888 Bransten Road. More recently, a second project at 789 Old County Road cleared the Planning and Transportation Commission on September 2, 2025 and the City Council on October 14, 2025, adding two more buildings totaling roughly 326,000 square feet and an eight level parking structure for 694 cars. Both sit inside the East Side Innovation District, a vision plan the city adopted back in 2021 to turn its industrial blocks into a life science corridor. Add in the roughly 2.5 million square feet of biotech and life science space the city's own Economic Development Plan already counts, and San Carlos is not dabbling in this bet. It is the plan.
Here is the part that does not show up in the press releases. Based on full year 2025 data, with construction pipeline figures current as of January 2026, San Carlos's office vacancy rate sits at 34.97 percent across buildings of 25,000 square feet and larger, against a California state average of 18.44 percent. That is not a soft market. That is a market where more than a third of the large scale office and lab inventory the city already has sits empty, at the same time the city keeps entitling more of it.
The Buildings Are Ahead Of The Tenants
The gap has not gone unnoticed by the people who live near it. When the 789 Old County Road project came up for public comment, one resident asked a version of the question a lot of Peninsula buyers are quietly asking too: "isn't there a huge vacancy for lab spaces now? Why build another campus?"
It is a fair question, and the honest answer is that the city and its developers are betting on demand that has not fully arrived, not demand that has already proven itself. Alexandria Real Estate's mega campus a mile away on Industrial Road offers the counterpoint. Back in 2024, CARGO Therapeutics, a clinical stage biotech company, signed a long term lease for 99,557 square feet at Building 2 of that campus, a 276,945 square foot facility that is itself the first phase of a planned 1.4 million square foot, seven building complex. That is real tenancy, not projected tenancy. But even with that lease already on the books, the citywide vacancy figure from 2025 still came in at nearly 35 percent, which tells you one signed tenant at one campus does not close the gap across the rest of the city's inventory.
Both things are true at once. San Carlos has genuine biotech demand serious enough to attract a company like CARGO. San Carlos also has enough unleased office and lab space that a resident at a public hearing can point to it without anyone disputing the number.
What The City Is Actually Betting On
The city is not relying on biotech leasing alone to carry downtown. It is also spending on placemaking, and that distinction matters for how durable the current downtown premium actually is.
The Downtown Specific Plan took effect February 25, 2026, after the City Council's second reading on January 26. It is a twenty year framework covering Laurel Street from Holly to Greenwood and from El Camino Real to Walnut, built around walkability and pedestrian first design. The first project moving under that plan is Harrington Park, funded in the city's fiscal year 2026 to 2028 budget, with construction slated to begin in 2026. The bigger move is the transformation of the 700 block of Laurel Street into Centennial Plaza, a pedestrian only stretch with a planned water feature, following the City Council's final design approval in October 2025.
None of that spending depends on whether the Innovation District fills up. It is a separate lever, and it is the one the city controls directly. If you are trying to figure out whether San Carlos's downtown vitality is a bet on biotech jobs or an investment in physical space that will hold its value regardless, the honest answer is that it is both, running on two different timelines.
The Premium Buyers Are Already Paying
Whatever the eventual outcome of the office bet, the price signal downtown is already in the market. Single family homes near Laurel Street currently list well above homes a mile uphill with comparable size and school access, and downtown core condos and townhomes occupy a lower, separate price band from that single family premium. Within San Carlos, Howard Park has held the lead in price per square foot over neighboring White Oaks for more than a decade, even though White Oaks still wins on total transaction volume.
Over the three months ending July 2026, San Carlos homes sold for a median of $2.5 million, with the typical home going under contract in 12 days. That is essentially unchanged from the same window a year earlier, but sales volume moved higher, 94 homes sold in July 2026 compared to 79 in July 2025. Earlier in the year, a separate market tracker put the Q1 2026 median at $2.7 million, up 6.4 percent year over year, with sales activity up 19.3 percent over the same quarter the year before. The numbers move depending on which window and which data source you use, which is normal in a market this size. Buyers should read any single month's median with some skepticism and look instead at the direction across a full quarter.
What stays consistent across every source is that the premium for being close to Laurel Street is already fully priced into what sellers are asking and what buyers are paying. It did not wait for the Innovation District to lease up first.
Who Actually Fills Downtown On A Tuesday
If the premium is not waiting on biotech workers, the next question is who is actually generating the foot traffic that makes downtown feel alive enough to justify what buyers are paying for it right now.
Look at the calendar and the answer is mostly residents, not commuters. The Sunday farmers market runs year round on Laurel Street between San Carlos Avenue and Cherry Street. The San Carlos Art & Wine Faire returns October 10 and 11, 2026, its 34th year, with more than 200 artists across three stages. Music in the Park runs free Friday evenings from June through August at Burton Park, and Hometown Days fills the same park for three days each May. None of that programming requires a single lab worker to show up on a weekday. It is built around residents and weekend visitors, which means the current version of downtown vitality would hold even if the Innovation District's leasing stayed exactly where it is today.
That is worth sitting with if you are evaluating whether to pay the current premium for proximity to Laurel Street. You are buying into a downtown that already works on its own terms. The upside from the biotech buildout, if and when it lands, would be additive rather than load bearing.
Reading The Two Sides Of San Carlos
For a buyer weighing the east side against the established downtown core, the practical read is this. The Industrial Road and Innovation District corridor carries more speculative upside and more speculative risk. A signed lease like CARGO's is a genuine positive signal, but the citywide vacancy number says the broader leasing story is still unresolved, and the Northeast Area Specific Plan covering the area north of the innovation district is still moving through its own adoption process as of 2026, not yet finalized.
The downtown core around Laurel Street carries a premium that is already established and appears to be sustained by residents and civic programming rather than a workforce that has not fully materialized. That is a different risk profile. It does not mean the premium is guaranteed to hold or grow, only that its current foundation does not rest on the same uncertain variable the east side does.
A Few Questions Worth Asking Before You Write An Offer
Does the office vacancy rate mean San Carlos home prices are overpriced? Not on the evidence here. The vacancy sits in commercial office and lab inventory, not in the residential market, and residential sale prices and transaction volume both moved higher across the first half of 2026 despite the commercial gap.
Should I wait to buy near the Innovation District until leasing improves? That depends on your time horizon. Buyers looking for near term appreciation tied to a fully leased biotech corridor are buying ahead of the data. Buyers planning to hold for a decade or more may find the current vacancy gap is simply where a twenty year plan stands in its fourth year.
Is the downtown Laurel Street premium at risk if the Innovation District stalls? The evidence suggests it is more insulated than it looks, since the city's own placemaking investment and the existing calendar of resident driven events do not depend on office leasing outcomes.
If you are trying to figure out where in San Carlos your budget actually lands, and which side of this bet makes sense for how long you plan to stay, that is exactly the kind of local read Debbie Elowson spends her days building. Work with Debbie to look past the median and understand what a specific San Carlos block is actually priced on.
