We live in a two-story loft that we thought would be completely soundproof since the units are separated by CMU and we don’t share HVAC. HOWEVER, I think the sound of our next-door neighbors is being carried by our metal decking roof. When it rains, it sounds like a hurricane in here (which is actually pretty nice) but I don’t want to hear my neighbors.
Here’s an image of the wall/ceiling connection between our apartments: ceiling image
This is a rental, so we can’t do anything crazy but I’m open to any ideas.