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

NoteThe source directly confirms that CAISI maintains offices in Washington, D.C. and downtown San Francisco, with in-person work required and U.S. citizenship required for employment. The source document is dated February 4, 2026, which matches the claim's temporal reference (2026-04). The claim identifies Washington, D.C. as the primary/headquarters location, and the source lists it first among the two offices, supporting this characterization. The additional context provided in the claim (second office in San Francisco, in-person work required, U.S. citizenship required) is all confirmed by the source text. Note: The source refers to the organization as 'CAISI' (Center for AI Standards and Innovation), which the claim correctly identifies as the current name of what was formerly the US AI Safety Institute.