72.—Condition 7 in section 10 of the Landlord and Tenant (Ground Rents) (No. 2) Act, 1978, and section 12 of that Act shall extend to a lease made for a term of less than fifty years if

(a) the lease is a sublease (whether mediate or immediate) under a lease (in this section referred to as the superior lease) to which Part II of that Act applies,

(b) the land demised by the lease is the whole or part of the land comprised in the superior lease, and

(c) the lease is made for a term which equals or exceeds the lesser of the following periods, namely twenty years or two-thirds of the term of the superior lease, and in any case expires at the same time as or not more than fifteen years before the expiration of the superior lease,

and the other requirements of the condition are fulfilled.