The club needed a building, and the members chose well. Architect A. Page Brown, who would go on to design San Francisco's Ferry Building, drew up plans in the Mission Revival style, a choice that tied the club to California's Spanish colonial heritage at a moment when that heritage was being actively romanticized across the state. The building was completed in 1893, its thick stucco walls, arched openings, and red tile roof evoking the Franciscan missions that once stretched along El Camino Real. The club moved in the following June. Brown died just three years later, at the age of thirty-seven, after a carriage accident in San Francisco. His San Jose clubhouse survived him by more than a century, its architecture now inseparable from the identity of St. James Square.

St. James Square Historic District is one of the oldest public squares in California, and the Sainte Claire Club has been its most constant occupant. The square itself has seen reinvention after reinvention. Churches, courthouses, and hotels have risen and fallen around its perimeter. Plans to revamp the park have met resistance, including a 2024 court ruling in which the club successfully challenged proposed changes to the adjacent greenspace. The episode revealed something about the club's relationship to the neighborhood: it is not merely located in the historic district but actively shapes how the district evolves. A historical marker erected by the City of San Jose stands near the entrance, acknowledging the building's significance in a downtown that has otherwise shed much of its nineteenth-century fabric.

By 1992, The New York Times had noticed the anachronism. Under the headline "Silicon Egalitarians Scoff at a Private Club," the paper explored the tension between the Sainte Claire's old-money traditions and the casual, meritocratic ethos that the tech industry was cultivating just a few miles away. The piece captured a region at an inflection point: the orchards were becoming office parks, the valley's identity was shifting from agricultural to technological, and institutions like the Sainte Claire Club, with their initiation fees and gender restrictions, seemed like relics of a different California. And yet the club endured. It endured through the dot-com boom and bust, through the rise of Google and Apple and the transformation of San Jose into the self-proclaimed Capital of Silicon Valley. Whether the club adapted to the new economy or simply ignored it is a question its members have never felt obligated to answer publicly.

What survives from 1888 in San Jose? Almost nothing. The downtown has been rebuilt several times over, razed by ambition as thoroughly as any earthquake could have managed. The Sainte Claire Club stands as one of the few continuous threads connecting the city's agricultural past to its technological present. Its Mission Revival walls have watched horse-drawn carriages give way to electric streetcars, then automobiles, then the autonomous vehicles being tested on nearby streets. Inside, the rituals of a private club continue in whatever form they have taken over the decades. No public record details what happens behind those stucco walls, which is, of course, the point. The club was built for privacy, and privacy is the one luxury that Silicon Valley's wealth has not managed to disrupt.