The Pioneer Building is a historic building in San Francisco, California. It was listed on the National Register of Historic Places in 1987, as "Pioneer Trunk Factory--C. A. Malm & Co."
The building is located at 2185-2199 Folsom and 3180 18th Streets.
It previously housed the office of Stripe.
As of 2020, it houses the offices of OpenAI and Neuralink.