Humans turn food into poop. They don't just sit in an apartment. An apartment is a tool to bring in food and take out poop (and other waste).
You can draw a building like that, but to portray the apartment system correctly, you need to show where the poop goes, and where the food comes from.
If you draw those things, the actual land use becomes apparent, and then you have to draw the infrastructure to bring the food in and take the poop out. Eventually you'll start to see that there's an enormous amount of land use just for living, it consumes the island either way, and there's an argument to be made for living like a village (as they do in actual villages) because of the decentralisation of resources and lowering the land use of infrastructure.