It is a commercial building. I am in unit 2. 3 months ago people from unit 1 came ask if they can go in my basement to fix something. I said that it's ok. They made holes on the wall, moved my electrical box, and installed pipes without asking my permission. I was mad and came complain them. They denied it. I told them from now on they are not allow to have access to my basement. They threat me that they will call the landlord and the landlord will let them in. I don't think so. What do you think?