Upon receipt of a statement from Landlord specifying the estimated Operating Costs to be charged to Sublandlord under the Master Lease with respect to each calendar year, or as soon after receipt of such statement as practicable, Sublandlord shall give Subtenant written notice of its estimate of Additional Rent for the ensuing calendar year, which estimate shall be prepared based on the estimate received from Landlord (as Landlord’s estimate may change from time to time), together with a copy of the statement received from Landlord. On or before the first day of each month during each calendar year, Subtenant shall pay to Sublandlord as Additional Rent one-twelfth (l/12th) of such estimated amount together with the Base Rent.