More walls went up and so did the third floor. I primed it and added paper flooring to it. I continued adding wallpaper to the new walls.
Keep your wallpaper patterns and rooms in mind, so you don't end up wallpapering a wall with the wrong pattern. Watch how each wall creates a room, so you can keep your patterns consistent to the right room. Dry fit each new wall first, so you know which room it faces before you wallpaper it and glue it in place.