Jana Silsby of DLR Group presents a new plan for the Columbus School site at Tuesday’s Board of Education meeting. A new school is shown in white and the existing building is grey. Connecting the two would allow them to share public spaces. NORWALK, Conn. — A radically different concept for South Norwalk school construction was unveiled Tuesday by Norwalk Superintendent of Schools Alexandra Estrella. This might mean sending a new application to the State by June 30. Two schools would be squeezed onto the 3.5-acre Chestnut Street site, one for Columbus Magnet School and the other a neighborhood elementary school, in the rough concept. The new Columbus would face Henry Street. The existing building would be used for a neighborhood K-5 school.