The design called for a full basement. Once the excavator started it became clear to us that the slope of the land in back called for a walk-out basement. We scrambled, ordered 4 more windows and bought a door. And the foundation ended up being about two thirds concrete and the side of the house and part of the back of the house turned into 3 stories. We'll get an extra room down there, one with lots of light. And a door out the side.
Rick is still talking building the model railroad again, so we are still negotiating exactly how much space I can have for my books.