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Small portion which is about minimum period of six years, half an inch. >> >> reporter: he said that didn't happen around the complex. the sinksing alone likely wouldn't cause the building to collapse, but experts say it could be associated with tension and cracks inside the structure. local officials say there was roof work being done. they're careful to say that may not be the cause of the disaster, experts say it could have been a contributing factor. >> potentially working on the roof, potentially nonmaintenance of certain parts of the building, whether connections can come together and fa...

Portion, which is about over the measurement period of six years is about half an inch. >> reporter: he said that sinking didn't occur in other buildings right around that complex. he said the sinking alone likely would not have caused the building to collapse, but experts say it could be associated with tension and possible cracks inside the structure. local officials say there was roof work being done on the building. they're careful to say that may not be the cause of is this disaster, but experts say it could have been a contributing factor. >> potentially working on the roof, potentially ...

Roof, potentially the nonmaintenance of certain parts of the building, where the connections can come together and fail and create the pancake effect that happened. >> reporter: the location and climate of that area, experts say, also have to be considered. >> potentially the corrosion of the steel, you know. as you notice, it's right next to the ocean. corrosion of the reinforcement will compromise the capacity of a column. if the column fails, everything fails, essentially. >> reporter: an attorney for the condo residents association says over the past several months the building had undergo...

And it is probably the way it looks right now collision of effects of potentially working on the roof, potentially the nonmaintenance for certain parts of building, where the connections come together and fail and create the pancake effect that happened that collapsed the whole building. >> as you've been speaking, we're seeing what are live pictures of excavation taking place at the site here. mr. carp, there is a researcher at florida international university nearby who had done some research on this area including this building. and found signs of subsidence, sinking of the structure, not a...

He said, look, i'm coming with you. and together, we grabbed each others' hand and we just started to run. surprising enough, not even one piece of confetti or broken glass touched us. the next thing i know, we bumped into a priest. >> that's where stanley broke down and he looked at me and he said this, man saved my life. and i said, to stanley and maybe you saved my life, too. he said, you know, i think that tower could go down. i said, there is no way. i said, that's steel. that's a steel structure. and i didn't finish the sentence... >> we started to run. we heard a strange sound like stee...