(1)This section applies where—
(a)two or more houses in a sub-divided building are marketed for sale as a single property, and
(b)any one or more of those houses—
(i)is not available for sale separately from the others, but
(ii)is available with vacant possession.
(2)The provisions of this Part (but not section 115) apply to the house mentioned in subsection (1)(a) as if it were a single house.
(3)Subsection (2) does not affect the application of this Part to any of those houses which are available for sale as a separate house.
(4)In this section “sub-divided building” means a building originally constructed or adapted for use as a single dwelling which has been divided (on one or more occasions) into separate houses.