i mean actually teen school that is here behind us a.s. jenks which is a very old building, has a very sold structure. a lot of philadelphia schools are in the 40 to 70 and 75 year range. >> rosemond says immediate and substantial repairs can be done and for much cheaper than school district's $4.1 billion price tag. >> we put out a plan that suggested a way to do that, by hiring a large and additional maintenance staff taking maybe five additional maintenance people to put into 50 or 60 schools at the same time, and to spend two weeks in each of those schools, in those two weeks you would be able to stabilize and repair the interior of the buildings in very dramatic ways. it would make a sea change of difference. >> he says it would cost about $20 million. >> $4 billion in 200 schools means $20 million a school building. for every building that we're using right now as an educational space. that's throw seven times the national average for what schools need in terms of infrastructure. i just don't -- i don't believe it. but there's also no data