At Least Three Stories

Presuming that my dream house contains a lot of space, and that this is a perfect world (hence the word "dream" as opposed to "nightmare") . . . I'd like to conserve on the footprint and build UP. For one thing it's spookier. For another it's kinder, environmentally. For another I get a feeling of security being ABOVE ground level. My dream house has a basement too with livable space, so make that four stories. Yum.