Mission District Building That Housed OpenAI and xAI Hits Market as Exa Moves In

A century-old Mission District office building that once housed OpenAI and Elon Musk's xAI is now on the market, even as a new artificial intelligence startup prepares to move into its halls. The Pioneer Building, long considered a launching pad for some of San Francisco's best-known AI companies, is for sale as the city's AI-fueled office boom continues to reshape its commercial real estate landscape. According to CoStar, the historic building is coming to market just as startup Exa Labs prepares to move in. The property sits at 3180 18th Street, according to Harvest Properties, which describes the building as sitting in the heart of the Mission District. The building's roots go back more than a century.