(1) In this section "dwellinghouse" includes apartment.
(2) Where an existing interest or, as the case may be, existing interests, in a dwellinghouse are conveyed or transferred by more than one instrument, executed within a period of 12 months, subsection (3) shall apply to each of those instruments which operate as a conveyance or transfer, whether on sale or as a voluntary disposition inter vivos.
(3) An instrument to which this subsection applies shall be deemed for the purposes of the Heading "CONVEYANCE or TRANSFER on sale of any property other than stocks or marketable securities or a policy of insurance or a policy of life insurance" in Schedule 1 to form part of a larger transaction or of a series of transactions in respect of which the amount or value, or the aggregate amount or value, of the consideration which is attributable to residential property, is equal to the value of the dwellinghouse.
(4) Where a conveyance or transfer (referred to in this section as the "first tra
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