I have rental condo. The unit on upper floor replaced her sink w/o turning off water vault. Water leaked to my unit, not little - alot. My carpet in the bedroom was destroyed. Fire fighter had to take off some of my hardwood floor in living room. My bedroom wall got damage.The damage didn't stop at my unit. She is on 4th floor, mine is 3rd. The 2nd floor unit and lobby also get damages, including common area. I have my insurance but have to pay $5000 deductable. From what I heard from property management, She (4th floor unit) won't take any responsibilities. She said it wasn't her fault...sure it is...what should I do? Find a lawyer and sue her? how about my tenant? He has to live somewhere else for now.