B. RES – Authorize – Execution of the Third Amendment to the Amended Agreement of Sale with Innovation Development, LLC to Extend the Termination Date to October 31, 2021, for the Sale of County-Owned Property at Innovation Park, Located at 11100 University Boulevard, Manassas, Virginia, 20109, and Consisting of Approximately 22.32 Acres – Brentsville Magisterial District – Christina Winn, Economic Development