The building Sam works at
Or more to the point, what real-world building did they use for the exterior shot? The one that is tiered and seems to be made with a reddish to brown stone or concrete(?) AND is shown at the beginning of the sequence where Sam's work buddies convince him to go to the Glu Glu Club with them.
"There is no terror in the bang, only in the anticipation of it."-Alfred Hitchcock