On a new lot, put down staircases to lower the terrain. Go to the bottom of the first one and miss out one tile and put down another staircase. Do this once more and you should have three staircases. Get rid of the staircases and use the "Level Terrain" tool to level the terrain from the lowest tile. Set it as big or small as desired. Using the "Straight Line Wall" tool, build walls around this hole so are walls pressed up against hills. Be sure to build the room above so that it covers the entire basement. Cover around the house with the "Foundation" tool, assuring that all the slopes are covered up. Place one tile in the top floor, then create a staircase leading down to the basement. Make two or more foundation blocks at the front of the house, and finally place a staircase leading up them.