The watchtower does not own the building they are the sucessor. The local cong owns them. If anything happens the buildings are transfered back to the watchtower (the clauses that decide what goes bak are raitifed by the local cong in there articles of corporation, and they all vote unanimously in favor of the watchtower).
This is to keep lawsuits from ever getting to the watchtower. THe only stuff owned by them is the big stuff brance offices, factories, offices, and assembly halls. THat why when people say the watchtower did this to me or did that to me I am confused because unless they worked are bethel or was acosted at an assembly site the watchtower has never came in contact with them.