John Hancock Tower is damaged by high winds.

Sixteen double-layered glass panels, measuring 4 1/2 feet by 11 1/2 feet and weighing 500 pounds, fall from the under-construction skyscraper, sending a shower of broken glass onto the street. Another 49 panels are damaged. Although no one is hurt, manufacturing flaws force the replacement of all 10,344 of the panels with single-layered, thicker glass panels before it is completed in 1976.* The building owner subsequently sues various manufacturers and sub-contractors. But when a court settlement is reached in 1981, it turns out that Hancock was the insurer of the party found most responsible and therefore had to pay much of the damages to itself.