I lived here (https://www.zenapollo.com/) for nearly a decade in a handful of different units. They may have tried to fancy it up, but you can't change what the building is made of. I heard street noise (at different levels and styles based on where in the building my unit was) and you'll get occasional hallway noise, but that's it. Nothing through any of the walls.

Poorly insulated and full of people with weak constitutions, but not particularly large.

229 therms is Jan/Feb usage levels for us, in a 4 bedroom house. Also check your water heater if it is gas.