A student walks down a hallway at the Jean de Lafayette Elementary School, on the final day of school Wednesday, June 19, 2013, in Chicago. The school was one of 50 slated to be closed by the city.(AP Photo/Scott Eisen) Since 2004, Oakland Unified School District has closed 16 schools and is now targeting an additional 24 by the start of the 2019-20 school year. District officials call it “right-sizing,” a term borrowed from corporate America – appropriate given that…