In my country, there’s no distinction between apartments and condos or whatever you have in the US. An apartment could be owned by anyone and that person can choose to live in it or rent it out. Institutional ownership of entire apartment buildings DOES happen (legally nothing is stopping you from doing it), but it’s not super common. Most companies prefer to get their quick buck out of building the place and then selling the apartments. And bailing on you before the warranty is over lol