If I were rich, I would have the standard base mansion, but I would build a huge tower that was 1000-1500 feet high. It would be a simple observation platform/ bar-b-que deck. Just ride the glass elevator to the top, fire up the grill, chill some beers and enjoy the view.
I know that there are building limits in residential neighborhoods, but if you have a isolated country plot, why not?
I can't believe this hasn't been done, it would rawk!