After that, Celebrezze was elected for an unprecedented five two-year terms as mayor, serving from 1953 to 1962. At the time, Cleveland was the fifth-largest city in the nation. Celebrezze drove efforts to build or upgrade the city's infrastructure, and conducted a massive $140 million urban-renewal program. Major portions of the rapid-transit system were constructed during this time, most notably the Red Line, which connected much of the city to the existing Blue and Green lines. There was also extensive work done on the city's freeway system, the Port of Cleveland, and Burke Lakefront Airport.