 In 1960, Kaiser Corporation opened its new headquarters; it was the largest skyscraper in Oakland, as well as "the largest office tower west of Chicago" up to that time.In the postwar period, suburban development increased around Oakland, and wealthier residents moved to new housing.Despite the major increases in the number and proportion of African Americans in the city, in 1966 only 16 of the city's 661 police officers were black.