It’s funny that the innermost areas of many European cities have designs that go back to the days when everyone lived behind walls.

Also at least famous example in North America:

https://en.wikipedia.org/wiki/Wall_Street#Early_years

different times, different threat models. I think we may as well see a city design emerging which would be taking into account aerial viral spread, remote work/study, etc. which would affect density, transportation, etc. Deepening stratification of society will naturally generate even higher social tension gradients which may present a potential threat to social stability, and thus it may require even more intentional measures in the future city designs to support social stability in the face of such gradients. I think we can see city designs addressing such emerging trends as autonomous delivery/transportation (which naturally plays well with the stratification), policing and public safety in general - i.e. more conductive to total surveillance, robot based policing (how about that one at Shoreline Cinema 16 or even those Starships crawling on Castro - today delivering pizza it'd politely wait for you to let him pass, yet i'm sure that while waiting it dreams about tomorrow when painted with police insignia it'd be forcing its way though the crowd by throwing tear gas and delivering taser jolts :) and making it easier for containment of protest and terrorist activity.