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After 60 years, Jacksonville's old City Hall crumbles in seconds 1960s-era City Hall imploded at 8 a.m. Sunday JACKSONVILLE, Fla. - Nearly 60 years after Jacksonville built a City Hall on the north bank of the St. Johns River, the 15-story building came crashing down in a cloud of dust as it was imploded in a matter of seconds Sunday morning. The big boom from the blast of the implosion was hea...