[pchristensen]

You are mixing up a lot of different factors.

3-4 story apartment buildings gives a net residential density of 30-100 units per acre. Typical 20th century urban development is 3-10 units per acre, with suburban "urban sprawl" at the low end of that. See [1] for examples.

Yes towers exist now, and downtown areas have much more intensity and square footage. But outside of NYC (861 of the top 1000 densest census tracts) and a very short list of other parts of other US cities[2], residential density is much lower almost everywhere than it was in 1950, including in cities. Units per acre and especially people per unit have steadily and dramatically dropped. The drop in NYC population density is dramatic even as built square footage has increased[3].

But for every 40 story tower out there, there are hundreds of square miles of car-centric suburban development.

[1] https://mrsc.org/stay-informed/mrsc-insight/april-2017/visua... [2] https://www.youtube.com/watch?v=zFB5YooSo5M&t=936s [3] https://urbanomnibus.net/2014/10/the-rise-and-fall-of-manhat...