[ReligiousFlames]

Instead of growing vertically up, cities ought to consider down because it doesn't ruin existing property owners' view and the community's beauty of not turning into a concrete, brutalist jungle. Furtheremore, there's effectively infinite subsurface real-estate while the maximum usable height of buildings is finite. Musk's Boring Company transport ideas are also onto something but housing and office space should also be deployed underground to maximize spatial efficiency.

For example, the Mountain View San Antonio Shopping Center development has become an uninspired eyesore. I don't live there but it's unattractive.

[twobyfour]

Building downwards into space that has no natural light makes for housing that is unpleasant and in many cases dangerous in case of fire (on the 1st to 4th stories, roughly; windows provide a secondary means of egress; and above that, fire escapes).

Additionally, building downwards is extremely impractical where downwards is below the water table, which is the case in many parts of most major cities (since cities tend to have historically developed along rivers or shoreline for access to drinking water and transportation).