We investigate the effect of new facilities on attendance in professional baseball, basketball, and football from 1969 to 2001. We find a strong, persistent effect in baseball and basketball, and little effect in football. Size and duration estimates imply that baseball teams sell 2,500,794 additional tickets over the first eight seasons, basketball teams 293,878 over the first nine seasons, and football teams 137,792 over the first five seasons, implying an increase in revenues that could defray public subsidies that state and local governments provide for new sports construction projects. Rough calculations suggest that stadium subsidies are an inefficient method of subsidizing professional sports franchises. (JEL R39, D12, L83)