I'm not sure exactly what you are talking about when you say older buildings. I have a friend who lives in a so called "older building" and it tends to be a galvanized pipe nightmare. If not the pipes in his room, it would be the pipes in an adjoining room affecting him. Drainpipes linked in such a way that if causes overflows when there is a blockage that's outside of his room. Electrical grounding? Good luck with that. Thats not to say that "New buildings" are not without problems. You just need to know what to look for and ask the right questions when buying/renting whether it's old or new.