Condo buildings can be just as dense as apartment buildings. The difference is that people without savings can live in apartment buildings.

Sure, but often you can't own the place. As a data point, I live in San Antonio. I'm very bullish on the city and would like to invest in some of areas being renovated along the San Antonio River and San Pedro Creek. Nearly all of the new developments along the rivers are buildings with units for RENT. You simply can't buy a condo in these spots. I guess what I'm trying to say is that there is a disparity between "can be" and "have been".

Fortunately there are a lot of options here still, even though I do hope density does not go up too high; oak trees here are protected and a huge part of the city's character. If you want higher density than the trees can allow, maybe go to SF. If you want higher density than they allow maybe go to Chicago, NY, Hong Kong, or London. IDK.