I have a retaining wall issue at one of my investment properties. My block is on the lower side and has a timber retaining wall, then fencing on top. I think the wall is dangerous and worried about the safety of my tenants if anything was to happen to this fence. The adjoining property is an a investment property and in the past the owners haven't been too interested in fixing. My questions are: who's responsibility is it to pay for the repair? What happens if the other investment property is not interested in fixing? any guesstimates on what it would cost?