###Live Caption:A San Francisco Fire Department arson investigation team goes through the ruins on the first floor of the three story fire at 135 Van Ness that damaged much of the San Francisco Public School District Administration Building on Thursday May 15, 2008 in San Francisco, Calif. Photo by Lance Iversen / San Francisco Chronicle.###Caption History:San Francisco Fire Department Arson investigation team goes through the ruins on the first floor of the three story fire at 135 Van Ness that hallowed out much of San Francisco Public School District Administration Building. Thursday May 15, 2008. Photographed at the Corner of Van Ness and Hayes.  Photographed in San Francisco, Calif, By Lance Iversen / San Francisco Chronicle.###Notes:Lance Iversen 415-2979395  CQ###Special Instructions:MANDATORY CREDIT PHOTOG AND SAN FRANCISCO CHRONICLE. Photo: LANCE IVERSEN