2.16 Under the PRIME contract the Department did not receive any value for the probability that it would continue to remain in occupation of a proportion of the estate for a material period of time beyond expiry of the contract. For the PRIME expansion contract, the Department asked for such value to be reflected in Land Securities Trillium's financial model on the assumption that it would continue to occupy 50 per cent by value of the PRIME expansion core freehold estate for an average of ten years beyond the expiry of the existing PRIME contract. A reconciliation mechanism will be applied at the end of the contract to reflect the true position at that stage, protecting both parties. The value to the Department of the rebate is £1.36 million each year off the Unitary Charge.