This addendum states that the contract to which it is attached is binding upon execution by the parties, and the earnest money and any option fee must be paid as provided in the back-up contract. The addendum also states that if the first contract terminates on or before the specified date and time, the back-up contract will no longer be contingent upon the termination of the first contract. For purposes of this addendum, time is of the essence and strict compliance with the times for performance will be required.