ychtt,the Landlords list of 7WTC occupants was shown on this site via a video.If I find it I will let you know.With regard to the 2 Towers collapsing,seach me how that was controlled,unless a similar plan had been implimented as I describe below to Roland took place.Of course,all this collapsing could be the result of other factors which will perhaps always be unknown to us,one could also be good old gravity attraction downwards.
Roland,after spending forty odd years in the Construction industry as a Project Manager and Engineer I can assure you that changing out of column boltings is regular practice within the industry.Bolts are changed out on older buildings around the world every day,they are changed out one at a time,ie..one out,one back in, and, if you replaced some bolts with say 35% of substandard bolts a column would come down,not immediately,but quite soon.
So,a 24 bolt flange having only 9 bolts substituted would do the trick.
Doing this throughout the central columns at lowish level of a building would "control" the collapse.
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