Possible Clues:

• N.Y.C. country club?
• Country club?
• Ban Ki-moon's org
• Org. headquartered in New York City
• Multicountry org. based in NYC
• Kofi Annan's bailiwick
• Landmark along First Ave.
• Oct. 24th honoree
• Org. headquartered on N.Y.C.'s First Avenue
• Ban Ki-moon's org.