A Mountain View manufacturer that makes the flow meters and sensors tucked inside semiconductor fabs, car factories and medical imaging machines has leased a flex building in El Dorado Hills, adding space for expansion. Proteus Industries Inc. is expanding beyond its Mountain View facility.
The lease, reported Friday by The Business Journals, comes as Proteus has been operating at capacity inside its 24,000-square-foot Mountain View facility. The new El Dorado Hills site is expected to double the company's shop floor space, according to the same report, adding space beyond its Mountain View facility.
Proteus describes itself as a small liquid flow meter manufacturer, and its products show up in some surprisingly high-stakes places. The company's own site states that its parts are used in semiconductor fabs, automotive welding cells, and medical imaging centers around the world, per proteusind.com. Its products serve applications across semiconductor manufacturing, automotive production and medical imaging.
A Decades-Old Mountain View Company Looks East
Proteus Industries was founded by Jon Heiner in 1978 and is currently based in Mountain View, California, where it makes flow-sensing and control products, according to the company's own career page. The planned El Dorado Hills site will add a location in the Sacramento region for the Mountain View-based business.
The new location is expected to eventually support about 25 employees. The expansion will give Proteus an additional location beyond its Mountain View facility.
Why El Dorado Hills, and Why Now
The timing lines up with a Sacramento-area industrial market that has been tightening. The region's direct industrial vacancy rate fell to 6.1% in the third quarter of 2026, down from 6.3% the prior quarter, according to a Sacramento industrial market report from kidder.com. Total availability held steady at 10.1%, while leasing activity topped 1.8 million square feet for the quarter.
Net absorption in the market was positive by 347,711 square feet in the same period, and roughly 1.6 million square feet of new industrial space was under construction, the report notes. Investment sales activity was brisk too, with about 3.9 million square feet of industrial space changing hands across the region in the third quarter. In the Folsom/El Dorado submarket specifically, average industrial asking rents reached $1.22 per square foot per month on a triple-net basis, among the higher rates tracked in the broader Sacramento report.
A Growing Suburb With Room to Build
El Dorado Hills itself has been adding residents steadily, with a five-year population increase of 4%, according to listing data from loopnet.com. The community has 19,617 households and a median income of $147,747, per the same source, which notes that its figures reflect active commercial listings in the area and can vary by property type and inventory mix.
Broader labor-market conditions in the region remain relatively stable. The Sacramento-Roseville-Folsom metro area's unemployment rate stood at 5.2% in August 2026, according to the Kidder market report. For a manufacturer planning to hire toward 25 employees at a new facility, that kind of regional backdrop offers at least a snapshot of the labor pool it will be drawing from as the El Dorado Hills site comes online.
