The building known as 615 Peachtree Street was imploded at 8:25 a.m. ET today.

There was a series of loud explosions — 250 pounds' worth of a TNT derivative — as the building took 20 seconds to turn into clouds of smoke.

The person who hit the plunger to set off the explosions was Ronnie Moore, who was the building's engineer for the past 20 years.

The building originally had been commissioned by the First National Bank of Atlanta (now Wachovia) in 1958 and opened in 1960. The architect ws Smith & Smith of Atlanta and they used Georgia marble on the facade — a nod to First National chairman Jim Robinson's stock holdings in the marble industry.

The site will be replaced by a development of Cousins Properties called Fox Plaza. The first building to go up will be called the premiere. It will be 30 stories with 200 condominiums ranging in price from $300,000 to $1.5 million for the penthouse.

The demolition by D.H. Griffin Wrecking Co. went off later than scheduled because authorities had to clear onlookers off the balconies on the Windsor, the condo building across Peachtree Street. People were perched on nearby rooftops, including Crawford Long Hospital, and crowds turned out on the street to witness the downfall of an Atlanta landmark.