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How long can a skyscraper last?

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How long can a skyscraper such as the Empire State Building naturally last. I mean without terrorism, global warming, nuclear war, earthquakes, tsunami's and stuff like that. How long could it naturally last, for an average skyscraper. 500 years? 1000 years? Million years? Billion years? Also forget about the Sun going Red Giant in 5 billion years or the Big Crunch or the Big Freeze. Assume no natural or man-made disasters. How long could a normal skyscraper last. Could it last forever in ideal conditions?