A quarter-acre property in Portola Valley's Ladera enclave has sold for $5 million, closing the book on a home with a tragic tie to one of Silicon Valley's most notorious corporate collapses. The 3,074-square-foot house at 831 La Mesa Drive was once home to Ian Gibbons, the former Theranos chief scientist who died there in 2013, and his widow Rochelle Gibbons, who spent years renovating the property before putting it on the market.
According to the New York Post, Ian and Rochelle Gibbons bought the three-bedroom, 3.5-bathroom home for $785,000 back in 1990. The home listed for $4.65 million on April 21, 2025, and the Post reports a buyer made an offer within just 10 days. The sale closed May 19, 2025, for $5 million — $350,000 over the asking price, per the listing record reviewed by Compass.
Compass's listing describes a home transformed by years of renovation: radiant heating, custom concrete floors, two secondary bedrooms sharing a Jack-and-Jill bathroom, and a bonus room the listing calls versatile enough for a media room, home office, or fourth bedroom. The backyard features a pool, mature landscaping, and multiple outdoor living areas. The Post's reporting adds further renovation detail, describing a chef's kitchen with an oversized island, a walk-in pantry, and walls of glass, on a lot of roughly a quarter acre.
Notably, there is some discrepancy in how the home's size has been reported elsewhere. A Mercury News roundup of top San Mateo County home sales recorded a $5 million sale for a 3,074-square-foot home on the 800 block of La Mesa Drive with two bedrooms, while a Compass search-result snippet describes the same address as a 3-bedroom, 4-bathroom property — a conflict unresolved in the public record.
A Scientist Caught Between Truth and His Job
Ian Gibbons was a Cambridge-trained biochemist holding more than 60 patents when Theranos founder Elizabeth Holmes hired him in 2005 as her first major scientific hire, according to the Post. He had been recommended to the company by board member Channing Robertson, for whom Gibbons had previously done consulting work, while the startup was eventually valued at $9 billion.
Inside the company, the Post reports, Gibbons grew convinced that Theranos's blood-testing hardware was not ready for the public and that the technology simply did not work — at one point telling Rochelle Gibbons that “nothing was working.” He was reluctant to answer questions about how the technology actually functioned, and Elizabeth Holmes was listed as a co-inventor on patents based on much of his underlying work, per the same report.
In 2013, while battling cancer, Gibbons was subpoenaed to testify in a patent dispute involving Theranos. The Post's reporting states he faced pressure to testify about the company's technology and felt he risked losing his job if he told the truth. He died of liver failure at age 67 on May 23, 2013, after an overdose of medication at the ranch — found unconscious by his wife on their bathroom floor the morning after, and later rushed to the hospital, according to the Post's account. CBS News separately reports that Ian Gibbons, the former Theranos chief scientist, died by suicide in 2013, and identifies Rochelle Gibbons as his widow.
Rochelle Gibbons's Role in Theranos's Downfall
In the years after her husband's death, Rochelle Gibbons says Theranos demanded she return confidential company materials and that the company's lawyers threatened her for speaking publicly, the Post reports. She went on to become, in the Post's words, a key voice in the reporting that eventually brought down Theranos, and has described Ian Gibbons as near to human perfection.
Elizabeth Holmes was convicted of fraud in 2022 and is currently serving an 11-year sentence; the Post reports she is scheduled to move to a halfway house in Texas in 2027. Actor Stephen Fry portrayed Ian Gibbons in the 2022 Hulu miniseries The Dropout. A documentary titled You Can See Everything, which premiered at Telluride, reportedly features Holmes and businessman Billy Evans pitching potential partners on a proposed Theranos 2.0 venture that Evans intends to build while Holmes serves her sentence, according to the Post's reporting.
Portola Valley's Pricey Market
The sale lands in a broader San Mateo County market where high-dollar transactions are common. A separate Mercury News report tracking the week of June 30, 2025, recorded 183 residential sales across the area, with an average price of $2.1 million and an average of $1,194 per square foot — context that underscores just how far above the norm the La Mesa Drive sale priced out, even before accounting for its $350,000 overbid.
