1166 Avenue of the Americas  1166 Avenue of the Americas (also known as the International Paper Building) is a tall Class A office building located at 1166 Sixth Avenue in Midtown Manhattan, New York City. It was completed in 1974 and has 44 floors totaling approximately 1.7 million square feet. Skidmore, Owings & Merrill designed the building, which is the 132nd tallest in New York City. It is the headquarters of the Marsh & McLennan Companies, Penton, D. E. Shaw & Co., 5W Public Relations, and Huron Consulting Group are also tenants. The building was built in partnership with the Tishman Organization (predecessor to Tishman Speyer), Stanley Stahl and Arlen Realty.