This section applies for the purposes of sections 119 to 124 and Schedule 8.
"Relevant building" does not include a self-contained building or self-contained part of a building—
in relation to which a right under Part 1 of the Landlord and Tenant Act 1987 (tenants' right of first refusal) or Part 3 of that Act (compulsory acquisition by tenants of landlord's interest) has been exercised,
in relation to which the right to collective enfranchisement (within the meaning of Chapter 1 of Part 1 of the Leasehold Reform, Housing and Urban Development Act 1993) has been exercised,
if the freehold estate in the building or part of the building is leaseholder owned (within the meaning of regulations made by the Secretary of State), or
which is on commonhold land.
For the purposes of this section a building is "self-contained" if it is structurally detached.
For the purposes of this section a part of a building is "self-contained" if—
the part constitutes a vertical division of the building,
the structure of the building is such that the part could be redeveloped independently of the remainder of the building, and
the relevant services provided for occupiers of that part—
are provided independently of the relevant services provided for occupiers of the remainder of the building, or
could be so provided without involving the carrying out of any works likely to result in a significant interruption in the provision of any such services for occupiers of the remainder of the building.
In subsection (5) "relevant services" means services provided by means of pipes, cables or other fixed installations.