Increase in fair rent in what cases admissible.

(1) When the fair rent of a building has been fixed under this Act no further increase in such fair rent shall be permissible except in cases where some addition, improvemment or alteration has been carried out at the landlord‟s expense and if the building is then in the occupation of a tenant, at his request: Provided that the increase shall be calculated at a rate per annum not exceeding six per cent of the cost of such addition, improvement or alteration carried out and the fair rent as increased under this sub-section shall not exceed the fair rent payable under this Act for a similar building in the same locality, with such addition, improvement or alteration: Provided further that any dispute between the landlord and the tenant in regard to any increase claimed under this sub-section shall be decided by the Controller. (2) Where, after the fair rent of a building has been fixed under this Act, there is a decrease or diminution in the accommodation or amenities provided, the tenant may claim a reduction in the fair rent as so fixed: Provided that any dispute between the landlord and the tenant in regard to any reduction so claimed shall be decided by the Controller.