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The NIST report found no evidence supporting the conspiracy theories that 7 World Trade Center was brought down by controlled demolition.

Specifically, the window breakage pattern and blast sounds that would have resulted from the use of explosives were not observed.

[6]:26–28 The suggestion that an incendiary material such as thermite was used instead of explosives was considered unlikely by NIST because of observations of the fire and the building's structural response to the fire, and because it is unlikely the necessary quantity of material could have been planted without discovery.[7]

Based on its investigation, NIST reiterated several recommendations it had made in its earlier report on the collapse of the Twin Towers.[6]:63–73 It urged immediate action on a further recommendation: that fire resistance should be evaluated under the assumption that sprinklers are unavailable;[6]:65–66 and that the effects of thermal expansion on floor support systems be considered.[6]:65, 69

Recognizing that current building codes are drawn to prevent loss of life rather than building collapse, the main point of NIST's recommendations was that buildings should not collapse from fire even if sprinklers are unavailable.[6]:63–73

https://en.wikipedia.org/wiki/7_World_Trade_Center

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