Sure, there's planning there, but not quite as much as the US. I own a flat in a suburb of Padova, Italy. It's in a building with 5 other flats. Next to it are two single family homes, as well as another apartment building with 8 flats. Some of the flats are owned, some are rented.
In the US, things get separated out into giant apartment complexes where everyone rents, and single family home districts, where people lose their shit at the mere whiff of a duplex being built.
