Execution of work by occupier in default of owner and deduction of expenses

from rent : Whenever the owner of any land orbuilding fails to execute any work which

he is required to execute under this Act or any bye-law made thereunder, the occupier, if

any, of such land or building may, with the approval of the Commissioner, execute the

said work and he shall, subject to any contract between the owner and occupier to the contrary, be entitled to recover from the owner the reasonable expenses incurred by him in the execution of the work and may deduct the amount thereof from the rent payable by him to the owner. ·1