No aircraft hit building 7. It suffered 2 earthquakes I forget the magnitude but you could look that up if you wanted. It suffered damage from parts of the towers hitting it. The fire within can hardly be classified an office fire. A single column in the most vulnerable portion of the cantilever section brought it down. It could be viewed as a sort of Galloping Gertie type event.
The NIST report claim no structural damage contributed to the collapse. It claims office fires alone are what caused the structural failure and collapse.