One of the glass enclosures known as The Ledge that sticks out of Willis Tower appeared to crack under the feet of a California family, but a building spokesman said it was merely a protective coating doing what it was supposed to do.
The cracking was in a scratch-resistant coating on the glass structure and did not affect the structural integrity of the box, said the spokesman, who declined to be named.
“Occasionally this happens, but that’s because we designed it this way,” he said. “Whatever happened last night is a result of the protective coating doing what it’s designed to.”
NBC5 reports that the Alejandro Garibay family heard it cracking after they stepped out on the enlcosure about 9:50 p.m. Wednesday. They stepped off and alerted staffers.
The Skydeck remained open Thursday morning, and the enclosure was set to be repaired Thursday.
The attraction opened in 2009, offering visitors a dizzyness-inducing view of the city, 103 stories above the pavement. The glass enclosures — 1½-inch thick — extend 4.3 feet beyond the building.
The men inspecting the Willis' Skydeck Ledge are not standing on it, by the way. pic.twitter.com/ZVGBuIstRR
— Jon Seidel (@SeidelContent) May 29, 2014
— Chicago Sun-Times (@Suntimes) May 29, 2014