One of the example sentences is this:
このビルなんかいかはもう使用されているみたい。
I wanted to put a の after ビル, but it seems that’s wrong. In English you’d need a connecting part, such as the “of this” given for the translation, but evidently not in Japanese.
What kind of construction is this? Is there an articulable (yes, I had to check that was a word) reason why there’s nothing between ビル and 何階か?
I feel like it would be a は between ビル and 何階か. It’s one of the particles that can be omitted in spoken Japanese.
の cannot be omitted according to this article.
I feel like, if anything, you’d put a comma there, or は.
(also it’s harder to read without the kanji because my brain thinks “なんか”)
このビル、何階かはもう使用されているみたい。
このビルは何階かはもう使用されているみたい。
(I’m agreeing with @mrthuvi 
)
Thanks, I think it’s slotting into place in my mind now 