dense city is efficient, but density doesn't have to mean high-rises. It can be modest-rises, floors that are enough for people to still use steps to get to the

dense city is efficient, but density doesn't have to mean high-rises. It can be modest-rises, floors that are enough for people to still use steps to get to the top, so under 10 stories and dense, and that's probably in aggregate more efficient than high-rises. High-rises have serious problems and issues that are not just additive, and they are far harder to adapt, to change to adjust to changing contexts.