Preparing for growth beyond its proposed new hospital in Chicago, Children's Memorial Hospital said it paid $18 million for a 99-year lease on a building from the Archdiocese of Chicago. The six-story building is less than one block from the future site of the Ann & Robert H. Lurie Children's Hospital of Chicago. That $1 billion facility will replace Children's Memorial's Lincon Park hospital, and is scheduled open in 2012.