@Kris KempReally nothing you can do as they have a right to enjoyment of the unit and appears they are not doing anything against hoa rules and regulationsYou can hire an acoustics engineer and add vibration isolation and acoustical drywall but it’s super expensive - it would absolutely helpOther than that, not much more you can do especially if it’s an older building as stc codes / standards are pretty low

So don't take things so personal and set your phone on vibrate,, don't answer on her first ring or immediately to a text, unless your prepared to give her an immediate answer.. give yourself a moment to think and schedule what's needed as to a response and service set up.

It’s differential settlement is what you have to worry about.During construction yes you will feel vibrations rtc.

Not 100% necessary as you can still hear people walk from the vibration, but people talking has been almost eliminated.  

A loose connection could cause the problem especially when everything is vibrating as the door opens or closes.

It may be the pipes in the walls vibrating against wood/expanding and contracting.  

To maximize its efficiency you’ll want to use shorter screws on the first layer so they don’t touch the plaster and transfer the vibration.

Find people with a new vibration.

It is about Law of Attraction and your vibrational being.

I've found that recently I've been very disconnected from a lot of people I was once close to because I'm vibrating on a different level than I once was.