By JENNIFER NETHERBY Staff Reporter It is expected to take six months for Cal State Northridge University officials to find a replacement for departing President Blenda J. Wilson, with a new president unlikely to start until next January. Wilson recently announced that she will be leaving the university in June for a position as president and chief operating officer of the Nellie Mae Foundation, a non-profit Massachusetts education foundation. During her seven-year tenure at Northridge, she was credited with guiding the school’s reconstruction following the 1994 earthquake, which caused $393 million in damage to the campus. In the past few years, she had worked to develop partnerships with the entertainment and high-tech business communities. In September 1998, CSU trustees approved a proposal from MiniMed, a Sylmar-based insulin pump maker, to build an $85 million biotech park on the North Campus. But Wilson also attracted controversy during her presidency. She angered local business leaders concerning a plan to develop retail stores on the college’s North Campus, a proposal that was later withdrawn.