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Hello welcome to Just Answer. Do you have a copy of the contract? The leak needs to be resolved through the home insurance of the building. In the first instance a valuation of the damage needs to be done by a professional, and then the leak identified. This can cost substantial money especially if it is unclear where the leak originates from and this is not the responsibility of the tenant but more so the landlord via his insurers. Unless for some bizarre reason a tenant has signed something to say he will be liable.
Does this assist you? If so, kindly leave a positive rating. Kind regards, John.