the carlton center is the tallest building in africa, how long can it stand?
5 seconds after people: a speeding car swerves into the building,causing minor damage,for now.
2 days after people:the power grid fails.
25 yrs after people:the glass has fallen out
26 yrs: the hole caused by the car will lead to its downfall,it has weakened the building,thus the building falls down onto johannesburg.