[fragmede]

Capitalism has done way dumber things than that, so I don't think it's impossible that company A builds 100 houses or apartments exactly the same and company B sells them as different sizes, based on how much the customer pays.

A creative tenant could certainly break through a wall that's been put up in place of a door, but that seems pretty extreme. I've seen some creative construction projects to make use of crawl spaces that weren't originally designed for people to live in though, but that's far from the norm.