Section 20B(4) in The Slum Areas (Improvement And Clearance) Act, 1956
(4)The rent payable by a tenant in respect of any building under sub-section (3) shall, on an application made by the tenant or the owner, be determined by the authority referred to in sub-section (5): Provided that an application for determination of such rent by the owner or the tenant shall not, except for sufficient cause, be entertained by such authority after the expiry of ninety days from the completion of the work of improvement or re-erection of the building, as the case may be.