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NEW YORK CITY — Stack Exchange Inc. has signed an 11-year lease for 30,200 square feet at 110 Williams St. in New York City. Stack Exchange is a network of question-and-answer websites that focus on specific categories such as cooking and photography. The company will occupy the 27th and 28th floors of the building. Jonathan Dean of Swig Equities and Bill Stempel of McDermott Will & Emery LLP represented the landlord in the transaction.