Before construction of the building began, American Fletcher became the first major Indianapolis bank holding company to be sold to an out-of-state financial institution, agreeing in the spring of 1986 to merge with Ohio's rapidly growing Banc One Corporation. Upon consummation of that merger, Mr. McKinney became chairman of Bank One's Indiana operations and tower planning picked up momentum. Ground was broken and construction began in 1988 on the newly designated Bank One Center Tower which was to be integrated with AFNB's existing headquarters complex on Monument Circle and adjacent Market Street.