Floor coating replaced at Chicago skyscraper attraction

CHICAGO (AP) — A popular attraction at Chicago’s tallest building was closed temporarily after minor cracking was found in the protective coating of its glass floor.
The cracks were in the coating of glass enclosures at Willis Tower that are known collectively as The Ledge. Visitors can walk into the four glass bays that are some 1,350 feet (411 meters) high and extend just over 4 feet (1.2 meters) beyond the building.
A Willis Tower official says the coating acts as a screen protect