EStablished in 1978, Otis & Ahearn is a Boston-based agency that opened it's Charlestown office on Main Street in 1985. The agency's staff employ an intimate knowledge of the area, offering residential brokerage, new development sales and marketing services for local buyers, sellers and renters. Charlestown is served by Otis & Ahearn associates at the 92 Main Street office, as well as the office at 84 Atlantic Avenue in Boston's Waterfront. Many of the agency's associates are also Charlestown residents.