A just and reasonable apportionment is required to decide
what part of the rentals payable under the mixed lease should be
treated as payable under each derived lease (the deemed rentals).
The rentals under the derived lease are treated as payable in
equal instalments unless it would be reasonable to use a different
treatment having regard to all the circumstances of the case. The
circumstances to take into account include
The deemed rentals payable under any derived lease for any
period must not exceed the rentals actually payable under the
eligible mixed lease.
See examples 1 and 2 at
BLM20330