and massively inefficient. the roads, the driveways, the garages, garage doors, the walkways, the easements, roofs, the eases, hvac systems, water heaters, the plumbing, the extra windows, the extra walls, the extra electrical/phone/cable/internet, and more... all done over and over. might as well have built one huge building and shared all those redundancies and infrastructure costs, while maximizing space and energy efficiency.