Execution of work by occupier in default of owner

If the owner of any building or land fails to execute any work which he is required to execute under the provisions of this Act or of any rule, bye-law, regulation or order made under it, the occupier of such building or land may, with the approval of the Commissioner, execute the said work, and shall be entitled to recover from the owner the reasonable expenses incurred in the execution thereof and may deduct the amount thereof from the rent then or thereafter due by him to the owner.