Whose fault is it that the outer edge of the windowsill fell?

Legal analysis: if it falls off naturally, the residential property shall be liable for compensation; If the property company fulfills its management responsibilities, the owners of the community shall bear the responsibilities.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 1252 Where a building, structure or other facility collapses, causing damage to others, the construction unit and the construction unit shall be jointly and severally liable, unless the construction unit and the construction unit can prove that there are no quality defects. After the construction unit and the construction unit make compensation, if there are other responsible persons, they have the right to recover from other responsible persons. If buildings, structures or other facilities collapse due to the owner, manager, user or a third party, the owner, manager, user or a third party shall bear the tort liability.

Article 125 If a building, structure or other facility and its shelving or hanging objects fall off and cause damage to others, and the owner, manager or user cannot prove that he is not at fault, he shall bear tort liability. After compensation, the owner, manager or user, if there are other responsible persons, has the right to recover from other responsible persons.