lord, either: [0822] (i) a sum which is equal to the excess, if any, discounted at eight (8%) percent per annum, of (x) the full amount of Rent reserved under this Lease for the balance of the unexpired portion of the original Term, or a Renewal Term, as applicable and the additional rents and other charges or sums payable by Tenant hereunder which would have been payable had the Lease not so term