The space is pretty much the norm, by Asian standards. So basically they've taken an idea from East Asian (e.g. Japan but also including the less developed countries of South-East Asia and the non-ghost cities of China) countries with high urban densities and marketed it for Americans who don't want to live in the suburbs. The big difference is that they forgot to add additional stacks, since the typical configuration is packed both horizontally and vertically (i.e. high-rises).