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>> the concern, of course, is that this could be more widespread in terms of other buildings. miami-dade's mayor said there will be more inspection of buildings 40 years. why is 40 years the magic number? >> i'm not really sure where they came up with 40 years. a lot of times buildings have a life span they're designed for. depending on the use of buildings, more or less they're 50-year life spans. 40 years is -- my assumption is that's approaching the end of that life span so they're going to do this whole recertification of the building. there's enough time before the end of the life span. >> but with bridges and other important structures they do it much more often. perhaps shouldn't they do it every ten years considering