We spent several days in Beijing just s year ago this month and saw slums / tenemnts just 3 or 4 blocks from the Forbidden CIty. It is something most tourists do not see and they make sure the tour busses do not turn down those streets. We were with a private guide and the streets where the the tour busses went were so crowded that our driver took us on other streets. Beleive me the slums are still there!