Named after the "Loop" of the elevated trains overhead, downtown Chicago is the Second City's business and financial center. The Loop represents a rich working-class history in, for example, the Marina City Towers (300 N. State St.), built with the pension fund of the Building Service Employee's Union, and originally meant to be low-cost housing for union members. The area also includes Printers Row, once the home of Chicago's vibrant printing trades. Along with the many historical landmarks which dot the downtown landscape, you will find many sites of great importance to the history of the Chicago labor movement.