Section 154(1) in The Mumbai Municipal Corporation Act, 1888
(1)In order to fix the rateable value of any building or land assessable to a property tax, there shall be deducted from the amount of the annual rent for which such land or building might reasonably be expected to let from year to year a sum equal to ten per centum of the said annual rent and the said deduction shall be in lieu of all allowances for repairs or on any other account whatever.
