The Release and Cancellation of Contract for Sale and Purchase may be used in the event parties agree to cancel an executed contract. The buyer or seller can request a termination.In order for a contract to be cancelled during the contract period, both agent and seller will need to agree. The ASIS contract verbiage to cancel a contract at their sole discretion can be used to get out of a deal without consequences. It contains a provision stating that the agreement extends through the date of the closing, covering you, as the listing Realtor, and any cooperating Realtor. Lawyer's Assistant: I understand that you're looking for information about terminating a listing agreement in Florida before the contract is up. Highland Beach, Florida Flat Fee MLS Listing. List your home for sale in the Multiple Listing Service for Highland Beach Florida. A listing agreement is a legally binding contract between a homeowner and the real estate agent or broker who will be listing the property for sale.