NEW YORK CITY — Besen & Associates has orchestrated the sale of 140 Clarkson Ave., a 59-unit, 69,500-square-foot apartment building in Brooklyn’s East Flatbush neighborhood. The final sales price was $14.4 million. Built in 1931, the property is an early Art Deco, six-story building that is 100 percent rent stabilized, with under-market rents. Besen represented the private seller in the transaction, which had owned the property for more than 50 years. The property was purchased by a global real estate fund.