In the past I have asked my neighbors if they heard anything, and they hadn't, but after this build I may have to inquire again
I have awesome neighbors, so even if they did occasionally hear something I doubt they'd care.
your going to have to worry about stuff falling off of their walls and shelves. been there, done that. "that" they will not like.
i used to live in an all concrete condo, ceiling, walls, floor. it had room gain like you would not believe. i would crank it up LOUD = anyone on this forum would be proud. only towards the end of me living there did i get any "feedback", lol. that was 1 reason i moved.