I bought a modified attic, and the terrace leaked, causing losses downstairs. Who's in charge, who's going to fix it, and who's going to pay for it?

After the warranty period, the house leaks, and the specific reasons for the leakage should be determined. If it is the part of the house that belongs to the property right upstairs, then the loss downstairs should be borne by the upstairs. Belong to * * * use parts, shall be jointly owned by the property owner * * *. The evaluation cost of this kind of case is very high, so it is suggested to solve it by agreement.