Homeless are not common at any of these places. They’re mostly downtown or close to public transit and tourist spots (Downtown, Castro, Mission). They aren’t known for climbing big hills (Coit Tower) or frequenting museums. I suspect there are some in GGP but it’s such a big place I don’t remember encountering many there (and also probably not the most attractive place for them to sleep at night).
Agreed. I frequently go running by (all?) the filming locations they used. With the exception of the Hippie Hill location in GGP, I rarely, if ever, see homeless at any of the others.
As an aside, a few weeks ago I ran by a film crew with a lot of privacy fences set up at the location by the Warming Hut with bay and GGB in the background. Now I know what they were filming!