(not a rhetorical question) Won't stick+drywall houses require more diligent maintenance in order to stand 500 years? E.g., new asphalt roofs, etc. It's not unusual for homes in Europe to last that long with major maintenance needed every hundred+ years rather than every thirty. It also seems like the impact of deferred maintenance is lower on stone+clay homes (e.g., you can realistically restore a stone farmhouse that's gone to ruin more easily than a stick+drywall house that has), no? My sense is that the 500-year TCO is many times higher (maybe as much as an order of magnitude) for US-style homes.