"(i) That the lessee will in no case assign, relinquish (except in favour of the Lessor), sub-let, transfer or part with possession of the demised premises without the prior permission of the Lessor. Such permission shall not be given for a period of 10 years from the date of the commencement of this lease, unless, in the opinion of the Lessor exceptional circumstances exist for the grant of such permission. The discretion of the Lessor the matter shall be conclusive, binding and final. The lessee may, however, with the prior permission of the Lessor and subject to such conditions as it may impose mortgage the demised premises to any person. In the case of transfer other than by way of mortgage, 25% of the uneared increased in the value of the demised premises i.e. the difference between the premium paid and the market value of the demised premises at the time of the transfer, shall be paid by the lessee to the Lessor at the time of the transfer."