I think it's more typical for apartments.. I've only rented a concrete condo once (in Vancouver), and I distinctly remember getting out of the elevator and feel

I think it's more typical for apartments.. I've only rented a concrete condo once (in Vancouver), and I distinctly remember getting out of the elevator and feeling like I just walked into a heavy metal concert, then getting into my unit next door to the source and hearing... nothing. It was pretty amazing. But the apartments at the same price point had no noise isolation.