With an eye for the sleekest mid-century finds, owner Normand Mainville curates a trove of used and refurbished chairs, lamps, tables, stools and more from the 1930s to the 1980s. Treasured storage by George Nelson, iconic chairs by Florence Knoll and geometric coffee table sets designed by Frank Lloyd Wright fill the 5,000-square-foot Dorchester showroom, which also offers services like upholstery, restoration and rentals if you ever need to stage a Mad Men-era photo shoot.