I have sent an email to myself about two building one in Wollongong and the other in Sydney.They both are high rise buildings and have rhythmic swaying in the floors which to my mind seems excessive.
My old mate told me of a similar problem and the harmonic vibration was tracked to a small compressor in the basement of the building. The end result would have been a collapse of the building.
I know I complain a lot so that is why I have not named them also as my son is in the legal business he advises against me taking this action. We will wait and see.