Daredevil Dan Goodwin, known as "Skyscraperman"

A real-life Spiderman scaled the exterior of a 58-story skyscraper in downtown San Francisco on Monday.

Dan Goodwin, 54, started climbing the city's Millennium Tower building around 2:15 p.m. local time, or 5:15 p.m. EST.

"The building is 58 stories tall. Shortly before 4 p.m., he was about halfway up," police spokesman Officer Albie Esparza told Bay City News.

Goodwin, who goes by the name "Skyscraperman," appeared to be using suction cups to scale the building, while wearing what looked like a superhero costume.