In the 1930s, Berlin was at its peak for population and economic growth. The population in 1930 was over 20,000 people, the most the city has ever had. Main Street in downtown had many family-owned businesses which would attract many people in the city. The Nansen Ski Jump just north of the city limits in Milan was a highlight for Berlin. Built in 1936, it was the largest ski jump in the eastern United States for almost 50 years, until it closed in 1988. It was fully restored in the beginning of 2017.