Design Preservation Models creates architectural authenticity on any model railroad layout with N, HO and O scale model building kits and Modular Systems. Anyone can model strikingly realistic cities, towns and village scenes. Cities can be built one structure at a time from our single building kits. Create a building of any size, shape and height using our interchangeable styrene Modular System wall sections. Build hotels, factories, entertainment districts, train depots, mom and pop shops, service stations, or giant department stores. With DPM, there is no limit to the structures you can set on your layout!