A-ha! My neighbor's house is for sale, and there is an online tour of it available, which shows a walk-out construction. In this case, the house is build in farmhouse style.

Go to http://www.tomieraines.com/listings/details.asp?mls=59497&type=RES

See how the front of the house looks like a two-story? Now, click on the button on the right of the screen which says "virtual tour." The first view you are given is a 360 from the front exterior. (Note the house far in the distance, viewed just right of the lamp post by the driveway - that's home!)

Then, using the dropdown menu, select "backyard." The 360 view of the exterior from the rear shows a three-story house, the result of a walk-out lower level. (Also note the pond, which a certain son found irresistible until he was grounded but good for running away to it. Harrumph.)

You can also get a glimpse of the walk-out aspect from the interior by selecting the family room view.