Flagstar Bank will likely vacate one of downtown’s highest visibility corners, at Meridian and Washington streets, later this year. Midland Atlantic is marketing the 3,500-square-foot space in 2 N. Meridian St. as an “unmatched retail opportunity.” The bank couldn’t come to terms on a lease renewal with the building owners, which include local businessman John Goodman. Midland Atlantic is negotiating with a user that would be new to downtown but not to the market, said broker Nick Wright. He would not say whom. The new tenant could take possession by February 2008.