4 ms·SF is half as dense as Brooklyn. The major supply constraint is not geographic, its land use regulation.by verg 11y agoSF is half as dense as Brooklyn. The major supply constraint is not geographic, its land use regulation.DrScump 11y agoBrooklyn is flat, and almost all of it is safely improvable, unlike SF.verg 11y ago1. What do you mean by safely improvable? 2. Hong Kong, one of the densest cities in the world, is built on land much steeper than SF.