Seconds after the final warning signal blared Sunday afternoon at a downtown redevelopment site in Oklahoma City, preciselyplaced explosive charges dropped a 28-story building almost in its tracks. When it fell, the 245-ft-high structure became the tallest steel-frame building to be demolished with explosives.

Built in 1932 of heavy beams and beefed-up steel columns, the Biltmore Hotel stood in the way of a $39-million urban renewal plan to construct a cultural and recreational complex. Some structures on the site have been removed while others await demolition.

But none presented the problems that the Biltmore did. "It’ s the heaviest steel we’ve ever worked on," says Mark Loizeaux, of Controlled Demolition, Inc. (CDI), Towson, Md., which dropped the brick-clad structure for contractor Wells Excavating Co., Inc., Oklahoma City.

the status of the Biltmore Hotel Implosion audio is lost despite the footage is found

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