I’ve never heard of or seen this photo – but apparently it’s the subject of a doco from a while ago (link below).
There’s much controversy about who/what/where/how, but I can’t find much on the web disputing the fact that it’s a composite photo.
I’ve posted many other photoshopped images of people standing in impossible places, but this one must have used other techniques back in its day.
Usual clues: 11, floor 69, etc…
A new documentary explores the mystery figures in “Lunch Atop a Skyscraper,” a symbolic photograph of Depression-era New York, as well as the identity of its photographer.
h/t Jr. Fakeologist