What freaks me out about the tenderloin is that all of the residential hotels have 10pm (or 11pm?) curfews. So you're walking through there at 8pm and it feels like you are in the most densely packed sketchiness/hotbed of tweakerdom in the western hemisphere, but if you roll through after 10 it is completely deserted, which makes it even creepier.
The only time I ever felt genuinely unsafe in SF was riding the bus.
m.
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