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each more than 20 stories tall with 250 units in every building. inspectors show us the damage inside the parking garage right under the pool deck. a lay out similar. >> similar design. >> reporter: the pool water drained for this repair. there are columns and concrete floors cracking. rusted rebar and cables that support the kconcrete. they look at a support column that needs repair. >> when you look at this now given what happened, how dig a concern is this? >> it's a big concern. >> why? >> it could fail. people could die. >> reporter: these inspectors emphasize in th is normal wear and tear for buildings like this and it doesn't mean the building is in danger of collapse. still, the work will have to be done to prevent a repeat of the surf side collapse. a contractor points to something he's concerned about. >> the chlorine from the pool deteriorating the cable in this area. that's why we have massive repair underneath this pool.