Carnegie Endowment for International Peace — Headquarters: Washington, DC

NoteThe source directly confirms that Carnegie Endowment for International Peace has offices in Washington, DC. The source also confirms the additional offices listed in the context (Beirut, Berlin, Brussels, and New Delhi). The source mentions 'California' rather than specifically 'Palo Alto,' but Palo Alto is in California, so this is consistent. The source also mentions 'East Asia' as a center (which houses Carnegie China), whereas the claim context lists 'Singapore'—this is a minor discrepancy in specificity but does not contradict the headquarters claim. The headquarters location of Washington, DC is clearly confirmed.