Neighboring 6-floor Duval County Courthouse is being demolished.
News4Jax offers full coverage of the implosion and a deep dive into the history of both buildings.
Old City Hall by the numbers
1955 - Reynolds, Smith and Hills designs mid-century modern building
1958 - Construction began
1960 - City Hall opens
15 stories - Mayor's office on 14th and City Council chambers on 15th
210 feet tall
200,000 square feet of office space
$6 million - cost to build
1997 - City Hall relocated to refurbished St. James Building on Heming Plaza. The riverfront tower was used as City Hall Annex until 2015.
Old Duval County Courthouse by the numbers
1957 - County's 7th courthouse designed by Reynolds, Smith and Hills
1958 - Completed by George Auchter Co. at cost of $7 million
1960 - Courthouse equipped with blast doors, designated fallout shelter
1964 - First death-row conviction: Mark Asay.
2012 - Melissa Alexander convicted of aggravated assault the week the courthouse closed, moving all operations to the new courthouse on Adams Street
Long history of downtown Jacksonville
Laying groundwork for downtown Jacksonville's future
Friendship, drama, laughter at old Jacksonville City Hall
1960 images of 'New' Jacksonville City Hall
Looking back at the old Duval County Courthouse
Work begins to replace downtown building's broken windows
Pieces of old Jacksonville City Hall, courthouse to be recycled
City Hall implosion leaves nearby windows shattered, piles of debris