Many of Dallas's buildings aren't designed to withstand a direct hit from a powerful tornado, according to an analysis of the city's building codes, and it's thought that a high-powered twister could cause up to $182 billion worth of damage to the city's downtown area. Retrofitting tornado-resistance isn't an option, so FEMA is helping to finance the installation of tens of thousands of steel-and-concrete "safe rooms" designed to keep people safe if their building collapses.

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