Does anyone actually need an 8,500 square-foot house? There’s something vaguely pornographic about a house that big. My own house is somewhere in the range of 1,550 to 1,800 square feet, and families of four have lived in it comfortably. You could fit my house into one of these McMansions four or five times over. When I lived in Japan, I shared an apartment that I generously estimate to have been 240 square feet.