Company Contacts and Information Dura-Stress Inc. A pioneer in the development of prestressed and architectural precast building and bridge components since we began operation in 1949. Site Map P.O. Box 490779 Leesburg, Florida 34749-0779 (352) 787-1422 (800) 342-9239 Fax: (352) 787-0080 Contact our webmaster for comments or questions. ...