Each rating or taxing authority named in Part 5 shall as soon as practicable after the commencement of this Act supply the Valuer-General with a description of the boundaries of its area, and such other information with respect to land therein as the Valuer-General may require, and shall transmit to the Valuer-General from time to time such particulars of the change of ownership of or of interests in land as may have been notified to such authority.