CAIRO, March 11- Minister of Social Solidarity , Ghada Wali, urged bodies concerned to continue offering support to the families harmed by the recent collapse of a residential building in Cairo historic district, Al Sayeda Zeinab, the ministry said in a statement on Sunday. Upon the minister's directives, Al Sayeda Zainab Youth Centre was prepared to host nine families who were evacuated from three buildings next to the collapsed one. The building collapsed late Saturday and it was empty except for the third floor where an old man, who is still missing, was living. A demolition decree for the dilapidated building was issued in 1993.