(1) Where the payment of any premium is required under a lease or otherwise under the terms subject to which a lease is granted and the duration of the lease does not exceed 50 years, the lessor shall be treated for the purposes of section 75 as becoming entitled when the lease is granted to an amount as rent (in addition to any actual rent) equal to the amount of the premium reduced by 2 per cent of that amount for each complete period of 12 months, other than the first, comprised in the term of the lease.
(a) Where the terms subject to which a lease of any premises is granted impose on the lessee an obligation to carry out any work on the premises, the lease shall be deemed for the purposes of this section to have required the payment of a premium to the lessor (in addition to any other premium) of an amount equal to the amount by which the value of the lessor's estate or interest immediately after the commencement of the lease falls short of what its then value would have been i
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