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Without a trigger event, buildings don't come down like this, but do they? >> in my experience, they all require a trigger or multiple triggers. you look at the pentagon and oklahoma city, we know what the trigger was. it's a research project based on fact to try to understand the trigger. the building can be sitting there. you can have aches and pains all over your body but it doesn't kill you. then you have a heart attack or something and that's what kills you. maybe if you didn't have all the aches and pains, it wouldn't have killed you but they contribute. there will be a trigger or multip...

>> something to look at, for sure. i understand it's the early stages, and it's just one of the many things that have come to light. allen, you're looking for what you call a trigger event. >> that's correct. >> where might this fit as a possibility? although, again, you're not saying it is the possibility or is the main reason. why could it fit in the possibility, what else have you seen that may fit into that pattern? >> first of all, we have about 20 or 30 possible trigger possibilities. it's a matter of evaluating them or reducing the possibilities one at a time. we do that by collecting i...

Exactly why the collapse actually happened. but usually if you see this type of major failures, contributions come from multiple factors. there are plenty of buildings with variation, there's plenty of buildings which doesn't quite meet the so-called current code or how it's been engineered. but they don't collapse, you know? so it has to have a combination effect like that to make this happen. it's definitely to be considered. >> it's something to look at for sure, i understand it's still early stages. allen, you're looking for what you call to be a trigger event. >> that's correct. >> where ...

You're looking for the trigger event. and then as you do that, you look and see, well, say we find four things that are not perfect which, like every building has that. this one thing, it still falls down with the trigger event. you go through all the different combinations. when buildings we've looked at were hit by planes or bombs or things like that, you know what the trigger event was. here you don't know what the trigger event is, and generally speaking, you can't get down to one particular cause unless you can prove that. that's what we'll be doing over a long period of time. >> sorry, a...

Tonight a structural engineer hired by surfside, florida telling cnn he and his colleagues are looking for what he calls the trigger event that brought the tower down also saying the investigation will take a long time and that engineers will look at all possible scenarios for what may have caused the collapse. john torres joins me now. he is an owner at a condo in the condo building but he wasn't there. he was here in new york. his unit is still standing but everything around it is gone. john, thank you. i'm so sorry about your neighbors and your friends there. but i appreciate you joining us...