Produce a long descriptive sentence that uses all these words: 300 North LaSalle LOCATION Chicago; Chicago IS_PART_OF Cook County, Illinois; 300 North LaSalle FLOOR_COUNT 60; Chicago COUNTRY United States; Chicago LEADER_NAME Susana Mendoza
Chicago (led by Susana Mendoza) is located in Cook County, Illinois, United States and is the location of 300 North LaSalle (which has 60 floors).