Duplex for sale, Montreal Region. We found 28 Duplex for sale in All Cities, within Montreal Region. You have the ability to quickly and easily filter by city, region and asking price. Use our search options to sort by type of property such as duplexes, triplexes, 4-plexes, 5-plexes, multiplex 6+ properties. Mercier/Hochelaga-M ... Pierrefonds ...