Design flaw that could have wiped out an NYC skyscraper | 99% Invisible

When it was built in 1977, Citicorp Center (later renamed Citigroup Center, now called 601 Lexington) was, at 59 stories, the seventh-tallest building in the world. You can pick it out of the New York City skyline by its 45 degree-angled top...

“...for every year Citicorp Center was standing, there was about a 1-in-16 chance that it would collapse...