(1) Any authority other than a Board empowered under this Act to make an inquiry shall make the inquiry in the manner provided for holding a summary inquiry under 104[103[the Code]] and all the provisions contained in 106[such Act] relating to the holding of a summary inquiry shall, so far as may be, apply.
(2) Such authority as well as a Board shall have the same powers for summoning and enforcing the attendance of any person and examining him on oath and compelling the production of documents as are vested in the revenue officers under 104[105[the Code]].
18. Notwithstanding anything contained in any other law for the time being in force, it shall be lawful for the owner of any land included in a scheme to enhance the rent payable by a tenant of the land by such amount and subject to such conditions as may be prescribed.