Apartment

An apartment is a lot where Sims can live in. It is like a dormitory, only that Sims before and beyond young adulthood can't live in it. You can live in an apartment by selecting a room's door, and selecting "buy apartment(-$). You can edit out the flooring, appliances but you can't remove objects that already exist in the room(e.g. sliding dresser, fireplace) without using cheats. You also need to pay the rent whenever it's scheduled.

You can complain to your neighbors if they make too much noise, using the "Knock on Wall" interaction or you could knock on their door and blurt out your complaint.

You could also decrease your rent by having a high relationship with the Landlord or Landlady or by having a Roommate that will help you pay your rent. However, you will increase your rent when you make too much noise or your neighbors complain about you. It's up to you!