OP here. It was inconsiderate of me to use the treadmill in an upstairs apartment. Mine isn't very loud and I know the neighbor wasn't asleep, but I still should have thought of the noise. I was very embarrassed, but it is being taken care of and they weren't upset. They just asked me to move the treadmill to another room. I am a small woman-114lbs- I just thought it was funny imagining that I made the whole building shake.