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 additional context about the second San Francisco office and in-person work requirements is also confirmed by the source. The only minor note is that the source says 'offices' (plural) without explicitly labeling one as 'primary' or 'headquarters,' but the listing of Washington, D.C. first and the context of CAISI being within NIST (which is headquartered in Maryland) makes it clear D.C. is the main office.