Randy Stancik, the general manager at Skydeck Chicago, which oversees the wall exhibit on Chicago writers at Willis Tower, said the typo, which misspells the scribe's name as "Turkel" while spelling it correctly later in the text, likely dates back to the exhibit's installation in 1999, when the space was under different management, the Chicago Tribune reported Thursday.
Stancik said he was unaware of the misspelling on the 103rd floor exhibit until it was popularized this week when Jim Romenesko posted a photo of the typo on his journalism blog.
"That wall has probably been there since 1999," Stancik said.
Chicago Tribune columnist columnist Rick Kogan said he believes Terkel, who died in 2008, would be amused by the error.
"I think his reaction would be an inimitable laugh of his... Studs was definitely aware that many people in this city have no real appreciation for its history," Kogan said.