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"Controlled demolition blows out the BOTTOM LEVELS of a building, so that it will fall down roughly into its footprint."

That can only be done if there is nothing nearby.

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ANY controlled demolition is problematic if there is another building nearby. Explosive demolition is usually reserved for buildings that are not close to any other buidling.

However, top-down demolition would be WORSE in terms of damaging nearby buildings. The reasons that controlled demolition is ALWAYS, ALWAYS, ALWAYS from the bottom -- NEVER from the top -- are

1) It is more CONTROLLED. The key point of controlled demolition is CONTROL.

Explosions at the top of the building, high above the ground, are LESS controlled.

We see with the WTC twin towers how debris rained down for 3 blocks in all directions. Collapse at the top of the building is LESS controlled and causes GREATER damage to surrounding buildings.

Controlled demolition -- that is with CONTROL involved -- means blowing out the lower floors, and NOT the upper floors. That way the upper floors fall down INTACT as a unit, instead of shedding debris all over the area, with concrete falling hundreds of feet.

They want the upper floors to fall without shedding debris all over the place. So the upper floors need to fall INTACT down onto the lower floors. That is more controlled.

However, demolition experts do spend weeks or months with welding torches -- including thermite -- and other tools, cutting apart the structure of all the floors.

Part of controlled demolition is chopping apart the key elements of all the structure on all floors.

That way, when the upper floors crash onto the footprint below, the building comes apart. The structure has already been compromised by chopping apart the structures with welding torches and the like for weeks or months before demolition day.

2) It is infinitely harder to do.

It would require incredible split-second precision, when there is a much easier way to demolish a building.

3) It is NEVER necessary or desirable.

That is why never in the history of humanity has anyone ever demolished a building from the top down. There is no reason to ever do it. It is harder. It is never necessary. And it is more dangerous.

NO ONE would ever try explosive demoition from the top down, because there is no reason for doing it. It is much harder to accomplish and much more dangerous.

You also have to considder that because no one ever does this, no conspiracy would every TRY something THE FIRST TIME EVER with the entire world watching.