Mroczek Brothers Auctioneers have been in business for 45 years and in their current location at 3rd & Burnett in downtown Renton for 12 years. Known as one of Seattle's oldest and most reputable auction houses,Mroczek Brothers Auctioneersdeals in fine art, antiques, photographs, jewelry, rugs, coins, fine china, crystal and glass, among other estate merchandise. Owner Lawrence Mroczek lives in Renton and likes the central location.A family business since 1966,Mroczek Brothers Auctioneers specializes in Northwest Art and have conducted over 1700 public auctions.