[notfromhere]

You could just do a lot of 4-5 story buildings like in Paris. Building up too high has its downsides because it requires more space on the ground, plus a good percentage of space (30-40%) in a high-rise isn't actually usable living space.

Most places don't need high-rise condos everywhere when low-rise condos in a dense neighborhood orientation would work out great.

[whimsicalism]

Per a given unit of land, building up obviously has tons more living space than a single family home.

[notfromhere]

To build up you also have to build out horizontally. Mega towers with buildings aren't always the most efficient use of space.