County officials are preparing a major renovation of the 201 East Main Street building that once served as Durham’s courthouse. The seven-story structure will will undergo a complete renovation to replace major systems and meet building and safety codes that have changed since it first opened in 1978. Plans call for the building to house the county’s register of deeds, tax office, Soil & Water Conservation staff, Board of Elections, engineering staff and EMS bosses, plus the local branches of the state’s Forest Service and juvenile justice program. There will be common areas, meeting rooms, 4,800 square feet of retail space and a small TV studio. The county fiscal 2014-15 capital budget lists the renovation as a $16.1 million project.