There are lots of places with apartments on the 2nd floor and businesses on the 1st floor?

Yes. You may not believe it from the incredulous-sounding question as you’ve written it, but ‘mixed-use’ is the standard for new buildings here, for instance.

There's a vast difference between mixed-use being "standard for new buildings" and having "lots of places" (measured relative to the decades upon decades worth of existing housing stock, which is almost entirely Euclidean-zoned and single-family only) be mixed-use.