"What floor do you live on?"

Translation: 你住在几楼？

[SaraCatlin]

Why is the propositional phrase after the verb here?

[Protomatik]

Verbs such as 住, 坐, 放, and 站 indicate some sort of position or placement. Because of this, they are exceptions to the general sentence structure and will typically have the 在 after. Unfortunately, there isn't really a clear-cut rule about verb placement relative to 在, so it's just something you have to get a feel for through exposure and practice.

[Gabrielle145359]

That's just the way the verb "住" is. It's always "住在somewhere."

[Nivkotzer]

As far as i understand... General word order (doesn't matter whether it's a question or not)
Subject or time - subject or time - verb - object

[zel18472]

+1

[MThoriqMalano]

Is there any difference between 楼 and 层?