(1) The authorised officer may, by notice served personally, or by post addressed to the last known place of abode or business of the person concerned, require the owner or occupier of, or any person interested in, any land, or in any part thereof, in respect of which a declaration or a notification has been published in the Gazette under section 3 or section 4 respectively, to deliver to him or her within a time to be specified in the notice, being not less than 21 days after service of the notice, a statement in writing containing, so far as may be within his or her own knowledge, the name of every person possessing any interest in the land, or any part thereof, whether as partner, mortgagee, lessee, tenant or otherwise, and the nature of such interest.