It might come to a surprise but there are people who live in standalone buildings that don't contain multiple apartments.

No need to get snarky. I'm obviously aware of that, but I was commenting in the context of your earlier comment, which talked specifically about "flats". So a more exact phrasing of my comment would have been "Are there parts of the world where this is commonly an option [for flat-owners]".

And I never made the claim that money is the only way to exchange value. I just got curious about how flat-ownership works in other countries, that's all.