What is the name of your state (only U.S. law)? California. I just bought a condo in a 2 story complex. I live on the second floor. Someone alerted a few of us someone had a possible leak or something minor and everyone to look into it. Since I just bought the condo, I had to replace the shower panel anyways because it had mold everywhere including the thread piece at the top.. and needed a new shower head which sprinkled light while not on but not crazy. So the next day I had someone remove the shower panel to set up the new one to replace it and needed it dumped so the contractor can do his job. So the contractor came by to see if he could do the job and said it was no problem but needs to come back tomorrow to do it. So, he came back the next day and I had bought the new thread piece he instructed me to buy at the store. Then he installed everything and went on his way. The next morning my neighbor said his shower ceiling collapsed. I called the contractor to come back to fix problem which he did but now everything is a big mess. What should I do as the owner and have no idea?