what i like about the way koolhaas' maison a bordeaux (that is appicable to houses not containing frieght lifts) is that a well laid out and furnished minimal space (and this is as much a lifestyle choice as an interior design thing) can be converted from office
....to lounge with relative ease.
....of course having a bad ass skylight above a three story elevator shaft/bookshelf hung with famous artwork doesn't hurt. but the principle holds true in the simplest and plainest of spaces.