US AI Safety Institute (now CAISI) — Headquarters: Washington, D.C.

NoteThe source directly confirms that CAISI maintains a primary office in Washington, D.C., with a secondary office in downtown San Francisco. The source document is dated February 4, 2026 (updated), which aligns with the claim's temporal reference of 2026-04. The claim correctly identifies Washington, D.C. as the headquarters location. The source also confirms the in-person work requirement and U.S. citizenship requirement mentioned in the additional context. The claim is accurate based on the source material.