In early 2007, school officials said they worry that a child might be seriously injured in an accident involving the school's many large glass windows, some of which are floor-to-ceiling and not shatter-resistant. The windows of the building, which was constructed in 1963, are often made of single panes of glass instead of more modern double- or triple-panes that insulate better. A few years before 2007, a student leaning back in his chair accidentally struck a window pane which then shattered.