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The demolition crew would have needed at least several days in advance to prepare for the demolition by wrapping key columns with det cord and nano-thermite charges to cut through the thick steel -- just like they did in the twin towers!
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Forensic analysis of the videos showing building 7 collapsing verify that it fell at free-fall acceleration from the very first moment, which means that all the central vertical support in the core was removed at once so there would be no off-center descent. The building fell into the center of its footprint, not to the outside, which is why this Dutch man, Danny Jowenko, is so confident that it was controlled demolition:  that's exactly how professional demo experts set up their jobs, to have maximum control of the falling structure.
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Like anything else, there are innumerable ways to do this WRONG, and any one thing not happening according to plan can muck up the whole project, so the demolition professionals go to great lengths to make sure all the proper charges are set and the proper sequence of detonations are planned out and set up to go off as scheduled. If they don't do it right, the building could fall over sideways, like it would for sure if the collapse was due to an accident. This collapse was no accident!
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A few seconds before Building 7 came down, emergency workers surrounding the structure shouted warnings that "It's coming down!" urging anyone who could hear to run away. How did they know it was going to come down?
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The fire that was burning in Building 7 was not a large fire, and in no way could have compromised the steel framework, but then, the fire from the jet fuel in Buildings 1 & 2 could never burn hot enough to weaken the steel framing in those buildings, either, so it's all the same problem with all 3 buildings.
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News camera footage shot from a high window about 3 miles away had a foreign reporter commenting on how Building 7 had just collapsed, but outside the window behind the reporter's head, you can see Building 7 was still standing! In fact, it stood for another few moments, and then, as the reporter was still talking, Building 7 collapsed in view of the camera. The news station that aired that live coverage (which was recorded by some viewers) later edited out the background when it showed the same report the next day. IOW the script for the broadcast was already written in advance, but they made a mistake by a few moments and got ahead of the real time events. Whoever wrote the script knew that Building 7 would be collapsing, and they wanted to scoop the story, but they messed up their timing.
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I know a man who is a veteran of the Israeli army. I told him about Building 7 and these serious problems, and he assured me that Building 7 had collapsed entirely due to FALLING DEBRIS from the twin towers, which was also the cause of the fire in Bld.7. I told him that there were several other unaffected buildings in between Building 7 and Tower 1 and Tower 2. So how come they were not collapsing but Building 7, further away, DID collapse? He said that the debris was known to have been hurled away from the towers as they fell. I replied that all the debris did not get hurled only in the direction of Building 7, and besides, B.7 was too far away for any debris to be thrown far enough to hit it. He challenged me regarding how far the buildings were separated and how far the debris was thrown. No matter what I said, he argued against it, without any specific data to back it up.
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As a matter of fact, the way that debris was hurled away from Towers 1 & 2 as they fell was entirely out of character for a collapsing steel frame building, with ONE EXCEPTION. That exception being that if explosive charges had been going off during the collapse, they could have caused debris to be hurled far away, as we can see it was. Large chunks of steel framework, I-beams and the like, had been as though shot from a cannon pointed to the side of the towers. This debris caused extensive damage to structures adjacent, that is, across the street from the twin towers, but even so, even enduring all that falling debris, none of those adjacent structures collapsed like Building 7 did. All of that collateral damage occurred at the SAME TIME as the towers coming down, but Building 7 was demolished some significant time LATER, about an hour after the second tower came down.