Ha! I've been to SF once in the last 5 years. Right in front of the salesforce tower a homeless person lunged at me with a broken bottle. It was a half hearted lunge but still, not exactly the sort of thing I run into regularly!
Ahh am mistaken then, maybe it was Twitter HQ (maybe not even them?), I read an article where people were literally scared to go to work or leave after dark but I could not remember which company it was. It was about 2 years ago
Maybe you're thinking of Amazon's former Blueshift office in the old Macy's building in downtown Seattle.[1] This building is located across the street from a McDonald's that has long been a nexus for anti-social activity in the area.
Ahhh, Fool me once! I was a little surprised there are nice/safe parts of SF but I only travel for work there, at most a week or two at a time. So thought maybe I just hadn't been to the nice part of town.
EDIT: damn I didnt think it was this bad 938 crimes per square mile in SF [1]