Section 152

152. When any notice is, under the provisions of this Act, to be given to, or served on, the owner or occupier of any property and he is unknown, it may be given or served— (a) by delivering a written notice to some person on the property or, if there is no person on the property to whom it can be delivered, by fixing it on some conspicuous part of the property; or (b) by putting into the post a prepaid letter containing a written notice, and addressed by the description of the "owner" or "occupier" of the property (naming it) in respect of which the notice is given, without further name or description.