Legendary architect I.M. Pei died in May at 102 years old, leaving an impressive body of work that included the Louvre Pyramid in Paris. Though his masterpieces are scattered around the world, the Pritzker Prize-winner based his firm, Pei Cobb Freed & Partners, in New York City. It’s also where he lived for 45 years — in a four-story Sutton Place townhouse that’s now on the market for $8 million.