Is this a materials issue? I've got a concrete+steel place in Central America that's touching the walls of surrounding houses (packed subdivision). I play conce

Is this a materials issue? I've got a concrete+steel place in Central America that's touching the walls of surrounding houses (packed subdivision). I play concerts in the middle of the night and there doesn't seem to be any problem. I never hear my neighbors to the side, only the open back yard ones. Compare to s townhouse in SF where I can hear stair usage and so on.