The lessor shall not be required to make any repairs on said premises, and shall not be responsible for any damage to the demised premises or property contained therein, by reason of the leakage of water from the roof, or pipes, or stoppage of pipes, or stoppage or overflow of sewers, or leakage or overflow from any cause; but the lessor will cause the defects to be remedied with reasonable diligence by a mechanic after receiving notice thereof; but if said mechanic fails to make said repairs properly and the lessee sustain loss or damage thereby before the lessor is notified of such failure and has reasonable time to have the same corrected, then the lessee hereby waives all claims therefore against the lessor and agrees to look to said mechanic.