A lease ("the original lease") is "capable of forming part of a series of leases whose terms would extend beyond 21 years" if conditions A to C are met at the time when the original lease is granted.
Condition A: the original lease does not have a long term under section 3(2), (3) or (4).
Condition B: provision for the grant of another lease of the same house (the "new lease") is included in—
Condition C: the total duration of—
would exceed 21 years.
In a case where the provision for the grant of the new lease, or for the grant of any subsequent lease, allows for the possibility of the term of the lease being one of a number of differing durations, the reference in condition C to the term of the lease is to the longest of those possible durations.
A lease is a "lease of the same house" if the lease demises one house, being the house comprised in the original lease, with or without any appurtenant property, and nothing else.
Arrangements are "related arrangements" if they are entered into in connection with the grant of the original lease (whether or not they are entered into in writing).
A lease is a "subsequent lease" if—