In case of failure on the part of the Lessor to complete the work within the time fixed in the lease contract or letter of award, the Lessor shall pay the Government as fixed and agreed liquidated damages, pursuant to this clause, the sum $______ for each and every calendar day that the delivery is delayed beyond the date specified for delivery of all the space ready for occupancy by the Government. this remedy is not exclusive and is in addition to any other remedies which may be available under this lease or at law.