Who should I look for if there is water leakage upstairs in an old house without property?

Hello, if it is an old house, there is no property management company in the community. If there is water leakage upstairs, find the upstairs owner, let the upstairs owner repair the leaking place in time, and compensate the downstairs owner for the loss.

Both parties can negotiate and reach an agreement before signing the agreement. If negotiation fails, the downstairs owner can sue the upstairs owner and demand compensation from the upstairs owner.