“owner” includes—
(a) a person in receipt of, or entitled to receive, the whole or part of the rents or profits of land;
(b) a person in possession of land, otherwise than as a mortgagee or as a tenant from year to year or for a lesser term or as a tenant at will;
(c) a purchaser of an interest in land under a contract for purchase or under an agreement for a lease, otherwise than under an agreement for a tenancy from year to year or for a lesser term;