(AP) — Daredevil Nik Wallenda is in Chicago scouting possible locations for a tightrope walk between two Windy City skyscrapers in the fall.

The high-wire walker said that he first would check out Willis Tower, which was formerly known as the Sears Tower and was the nation’s tallest building.

Wallenda says he hasn’t ruled out Willis Tower, but that it would be problematic because there isn’t a nearby building tall enough to connect his rig to. He says, though, that he shouldn’t have trouble selecting a site.

Wallenda has walked across the Niagara Falls and Grand Canyon in the past two years. He’s part of a family of acrobats that has been thrilling audiences for decades as The Flying Wallendas.