Nortel Networks' 15 years is up in Research Triangle Park. The Canadian telecom company that once employed as many as 9,000 people in RTP - until filing for bankruptcy in 2009 and liquidating most of its assets - had been paying a 15-year master lease contract for the 105-acre campus that was the base of Nortel's U.S. operations for so many years. That lease contract expired July 31, according to court records, but nobody seems to know what will happen next for the now-vacant property and...