 The older parts of the town on the valley floor consist primarily of small houses and two and three-story buildings in various traditional architectural styles.In 1919, William Wrigley, Jr. gained control of Avalon and oversaw much of the development of Avalon, including the construction of the landmark Catalina Casino.From the late 19th century to the early 20th century, several different developers tried to develop Avalon into a resort destination community, but most before Wrigley went bankrupt.