Eastern Consolidated has brought a national investor to the Boston real estate market to buy a 74,500-square-foot retail and office property at 399 Washington Street, which has been vacant for 10 years. The property traded for $63.25 million. Eastern Consolidated brokers Evan Papanastasiou, Director, represented the seller, and Adelaide Polsinelli, Senior Managing Director and Principal, procured the buyer. The building, which has 70 feet of frontage on Washington Street, formerly housed Barnes & Noble and is one of the last pieces to be redeveloped in Boston’s Downtown Crossing. This corridor of Washington Street in particular is Boston’s top destination for fast casual retailers and luxury residential development. Directly across the street from 399 Washington Street is the Millennium Tower, a luxury residential skyscraper with a retail component that includes Primark, Old Navy, Roche Bros and Michelin star chef, Michael Mina. The development pre-sold 98 percent of the condominiums including the Penthouse, which sold for a record $37,500,000.