[Gillian]

Thanks so much for the replies on this! The building is concrete. There is no guarantee that, when the previous owners upstairs swapped out carpeting for hardwood (linoleum?) floors, they put in the requisite soundproofing. Since I currently can hear the clicking of their dog's claws on the floor, I have serious doubts about the soundproofing compliance. What's maddening is that, if I go outside and listen, I really cannot hear any noise. It's only the noise that permeates the ceiling. I am afraid that a complaint to the city will go unheeded as the bass most likely will not register on a decibel-meter. I know we have an ordinance against car stereos with excessive bass but nothing specific to buildings. Does anyone know whether bass would qualify as a violation of standard noise regulations? Thanks!