> What would SF look like if a superstructure was built above all streets and all pedestrian and bike traffic was moved up there? The street level would be dar

> What would SF look like if a superstructure was built above all streets and all pedestrian and bike traffic was moved up there? The street level would be dark and storefronts would become difficult to access. If the stores moved up to the 2nd floor (a massive transformation of real estate, probably greatly reducing available living space), what would go on the first level? Not many people would want to live in the dark.