FRENCHTOWN, Mont. -

54-hundred tons of iron and concrete crashed down in a pile of expensive rubble in Frenchtown.

Crews imploded the last large building slated for removal at the shuttered Smurfit Stone paper mill site.

New owners want to make way for new industrial development.

It was known as Recovery Boiler 4 and 5, a 170 foot high rise on a rural landscape.

The building stood here for more than 30 years.

Three years ago, more than 400 workers lost their jobs when Smurfit closed.

Curt Cornelius worked there.

"I hate to see it happen, "said Cornelius, "but it's better they get these boilers down and safely."

Crews have been preparing a long time.

Explosives consultant Greg Rogers does this kind of work all over the world.

He called this job difficult.

"It took us a week to load all the explosives," said Rogers.

"We were unable to implode the building straight down because of the boilers so we tipped the building over," said the expert, "which a lot of professionals say was nearly impossible, but it worked out fine."

M2 Green, the mill site's new owner said the recovery boiler building could not be retrofitted to other uses.

Now that it's down, said project manager Pat Clevenger," where we have rail sitings, natural gas availablility and we'll be able to create and build for new industry."

There's more than $1 million in scrap metal laying on site now.

That's the next big job.

For many people in Frenchtown, the lack of movement at bringing new businesses to the old site, has been a source of frustration.

But M2 Green project manager Clevenger said the company is currently in negotiations with two companies.