6.A) Approve - Sixth Amendment to the Amended Agreement of Sale with Innovation Development, LLC, for the Sale of Formerly County-Owned Property at Innovation Park, Located at 11100 and 11200 University Boulevard, Manassas, Virginia, 20109, Consisting of Approximately 19.792 Acres - Brentsville Magisterial District - Christina Winn, Economic Development and Tourism - Mobility, Economic Growth, and Resiliency