Extreme Networks, Inc. (NASDAQ: EXTR), a San Jose-based networking company, renewed its 54,530-square-foot office lease at 2121 RDU Center Dr. in Morrisville, NC. The office building, known as RDU Center III, totals 114,518 square feet and is located near the I-40/Aviation Parkway intersection and within a half-mile of the RDU Airport.