NATO Headquarters: Political and Administrative Center of the Alliance (nato.int)

• NATO HQ in Brussels hosts 4,000 staff, including 2,000 from national delegations.
• Over 6,000 meetings per year at the headquarters.
• New building (2017) features geothermal energy, natural light, and rainwater harvesting.

"NATO Headquarters in Brussels serves as the political and administrative hub for the 32-member alliance. Approximately 4,000 people work there, including national delegations, international staff, and military representatives. The building hosts about 6,000 meetings annually and features sustainable design with geothermal heating, natural lighting, and rainwater collection. The new headquarters, completed in 2017, replaced the 1967 building, reflecting NATO's unity and adaptability."