Sears Tower to add glass balconies

The Sears Tower plans to add four enclosed glass-bottomed balconies to the building's 103rd floor Skydeck this June.

The Sears Tower made the announcement Friday saying in a fact sheet that the inspiration "came from hundreds of forehead prints visitors left behind on Skydeck windows every week."

The Sears Tower is calling the balconies, "The Ledge." There's no extra charge to step out onto the balconies, but the Sears Tower increased admission by $1 on Friday, to $14.95 for age 12 and up.

The glass will be three layers thick and each layer will be a half-inch thick. The balconies will be able to hold about five tons.

The Sears Tower is set to change its name to Willis Tower this summer.