Historic Rehab Projects - Hillsborough High School Hillsborough High School, originally built in 1927, is a complete historic rehabilitation project including completely new fire protection, HVAC and electrical systems, interior finishes, repair and restoration of carpentry, and removal of "bricked in" panels and replacing the existing windows with new windows reminiscent of the original. The project is a multiple phase project, utilizing double-shifts and creative logistics to accommodate the school's use of about 2,500 students and faculty during construction. Click on the images below for a larger view.