"We call it a mixed bag." That's how Santa Clara County Assessor Neysa Fligor described Mountain View's 2025 numbers when her office released its annual assessment roll in July 2026. The county as a whole saw assessed property values climb 4.74% that year. Los Altos posted 6.43%. Palo Alto came in at 5.47%. Mountain View, the city with some of the highest home prices in the county, grew just 2.93%, the slowest of any city Santa Clara County tracks. The year before that, it grew 0.51%. Both numbers rank among the lowest Mountain View has posted since 2012.

If you're comparing Mountain View to its Peninsula neighbors while house hunting, that gap is worth understanding before you write it off as a red flag on home values, because it isn't one.

What the Assessed Value Roll Actually Measures

The county's assessment roll isn't a home price index. It's the total taxable value of every parcel in a city, residential and commercial combined, and it's the number that funds local schools and services. Under Proposition 13, a property's assessed value can rise by no more than 2% a year (or the rate of inflation, whichever is lower) unless the property changes hands or gets new construction, at which point it resets to market value. Proposition 8 works the other direction: when a commercial property's market value falls below its assessed value, the county can temporarily lower the assessment, which is exactly what's been happening across Silicon Valley's office market.

Fligor was explicit about why Mountain View's number looks the way it does. The city has the county's highest share of commercial parcels, 18% commercial against 82% residential, and that commercial slice has been getting hit by falling office valuations. "There is good residential growth," she said. "It's just offset by what's happening on the commercial space side." Countywide, roughly $153.6 billion in assessed value is currently under appeal, and 98% of that figure is coming from commercial property owners contesting valuations that dropped as office demand cooled.

Here's the comparison that matters if you're weighing Mountain View against a city like Los Altos or Palo Alto, both of which are almost entirely residential and don't carry that same drag:

Sunnyvale's growth was fueled in part by new construction at Google and Intuitive Surgical facilities and by data center buildout, the kind of commercial investment that adds directly to a city's roll. Mountain View's commercial base, by contrast, has been shrinking in assessed value even as its housing stock holds up. Fligor pointed to the same signal on the residential side alone: "With what's happening in the AI sphere, we are seeing, especially in the high-end markets, people buying residential homes." Her read was that home buying activity still reflects real purchasing power in the area, even while the office side of the ledger pulls the blended number down.

The Office Drag Has a Name

The clearest evidence of what's dragging on Mountain View's commercial roll is Google's own retreat from office construction in the city, and it's playing out in real time in the same neighborhoods that were supposed to deliver new housing.

Two years ago, Google terminated "Google Landings," an 800,000-square-foot office mega-project planned for North Bayshore near Highway 101 between Rengstorff Avenue and Permanente Creek. Google said at the time that it was taking a measured approach to its real estate investments. Tree removal on the site had already taken place, and the company has since agreed to pay Mountain View between $533,500 and $703,000 for new tree plantings across the city. More recently, Google confirmed it's exploring the sale of Middlefield Park, a 40-acre site in East Whisman that the city approved back in 2023 for up to 1,900 homes, including a 2.4-acre land dedication for affordable housing. City planning staff have said residential development on the site is still expected to move forward under a future owner, but the timeline is now an open question rather than a Google commitment.

Compare that to what's happening one city over. In August 2026, Google renewed leases on two Sunnyvale office complexes near Middlefield Park, a property more than three times its size, still slated for 7,000 new homes, 3 million square feet of office space, restaurants, retail, and 26 acres of parks over a 30-year buildout. Google is investing in Sunnyvale office space at the same time it's stepping back from Mountain View office construction and housing delivery. That divergence is the office drag showing up as a corporate decision, not just an assessor's spreadsheet.

None of this means North Bayshore's broader housing pipeline is dead. The 153-acre North Bayshore Master Plan, approved by the city council in June 2023, still calls for up to 7,000 condominium units across three planned neighborhoods, and city officials continue to say residential is moving forward regardless of what happens to any single Google-owned parcel. But a buyer weighing how much new supply is actually coming, and on what timeline, should treat Google's own hesitation as real information rather than noise.

Reading the Number Correctly

If you're cross-shopping Mountain View against Los Altos, Palo Alto, or another Peninsula city using assessed value growth as a proxy for market health, the comparison is measuring two different things. Los Altos and Palo Alto are overwhelmingly residential, so their assessment roll tracks home value appreciation closely. Mountain View's roll is diluted by a commercial segment that's currently under real pressure, which means the citywide number understates what's happening to the houses themselves.

That doesn't make the office pressure irrelevant to a home buyer. A city's tax base funds its schools, and a slower-growing commercial roll means the residential side is carrying more of that weight over time. It's also a signal about the pace of neighborhood change. If you're buying with an eye toward how North Bayshore or East Whisman develops over the next decade, Google's own uncertainty about its Mountain View office footprint is a more reliable read on timing than the master plan documents alone.

The practical takeaway is to look past the citywide blended figure and ask for neighborhood-level or ZIP-level residential data when you're actually comparing homes. The assessed value roll tells you about the tax base. It doesn't tell you what a specific street is worth.

The Construction You'll Actually Live Next To

Separate from the assessment story, downtown Mountain View is in the middle of several overlapping construction projects that matter more directly if you're buying close to the city center.

• A more than $200 million police and fire headquarters is under construction downtown, and the project will keep most of a downtown parking lot closed for more than five years.
• California Street's road diet, a roughly $6 million pilot that removed a driving lane in each direction to add protected bike lanes, began in March 2025 and has drawn split reactions from residents over reduced parking and driving lanes.
• The city's affordable housing pipeline is moving quickly: Corso, a 120-unit development on the former Lot 12 parking lot near City Hall, broke ground in 2026 and is on track to open to residents in early 2028. Three more projects, Montecito on Montecito Avenue, La Bella on Terra Bella Avenue, and 87 E. Evelyn Avenue, are adding hundreds more units, part of what the city expects will be a nearly 30% increase in its total affordable housing supply this year.

None of this is a reason to avoid downtown. It's a reason to ask specific questions about parking availability, construction timelines, and traffic patterns before closing on anything within a few blocks of Castro Street or City Hall.

FAQ

Does Mountain View's slow assessed value growth mean home prices are falling there? No. The assessor's own data separates the two: residential growth has stayed healthy, and the drag comes almost entirely from commercial parcels losing assessed value as office demand weakens. The citywide combined figure looks slow because Mountain View carries the county's highest share of commercial property, not because homes are losing value.

If Google sells Middlefield Park, does that change the housing supply timeline for East Whisman? It's an open question. City planning staff have said they still expect residential development to move forward on the site, but Google's decision to explore a sale, on top of its cancellation of the Google Landings office project, means the timeline now depends on a buyer the city hasn't identified yet rather than on Google's original commitment.

Mountain View's market is more layered than its median price suggests, and getting the read right, block by block and segment by segment, is the kind of work that makes the difference between a good offer and a guess. If you're comparing Mountain View to other Peninsula cities and want a pricing picture built on the actual mechanics driving each market rather than a single blended number, The Palermo Properties Team can put together a Strategic Market Plan built around the specific street and segment you're looking at.