I'm really sorry you are dealing with this. I understand Where my husband and I used to live, we had so many neighbor problems. It was terrible. Parking was one big issue. We ended up having to park several blocks away from the house to avoid conflict with the bully next door. He also ran an electric saw for 8-9 hours a day. We called him Sawman. In general, people there were increasingly disrespectful of each other.
We were lucky that we were able to move. I'm sorry that's not possible for you. It seems like the housing situation is tough and getting worse everywhere. In this country, investment groups are buying up entire floors in new condominium buildings and renting them out, making it harder for people to buy their own place.
I hope talking to the owner gets some results.