Edited sentence: In 1919, the park had new ownership.It would remain in effect for almost 50 years.Lewis Coleman, a lawyer who provided legal advice to the Riverside Amusement Company and took payment in the form of company stock, organized the Riverside Exhibition Company and gained control of the park.Lewis also instituted a "whites only" policy in the park, permitting African Americans access to the park only on designated days.With Coleman as president, the park added two large roller coasters (The Flash and The Thriller), replaced the miniature railroad with a longer one, expanded the dancing pavilion and converted it into a roller skating rink, and housed the games and concessions in new concrete buildings