Any way to get rid of smokers in an alley?
I work with an ownership group in San Francisco that owns a couple of high rises that have an alleyway with two prominent streets on either end.  For whatever reason, the smokers in the financial district love our alley and we fucking hate it.  Patrons at the restaurants in the alley hate it (they stand well beyond the legal requirements).  What tips or tricks does anyone have for kicking these guys out?

If I could figure out a way to solve this issue than I could be a hero so any help would be awesome.

Thanks,
Buster
[{"id": "cpkdzsf", "text": "Camera with daily printouts of the smokers hung up prominently, like riding a roller coaster. ", "replies": [], "depth": 1}, {"id": "cpkeko8", "text": "Install a smoker watering system like the San Francisco Archdioceses.\n\nhttp://sanfrancisco.cbslocal.com/2015/03/18/homeless-saint-marys-cathedral-archdiocese-san-francisco-intentionally-drenched-water-sleeping/\n\n", "replies": [], "depth": 1}, {"id": "cpkjg0y", "text": "Large rats, or homeless people who try and ask for cigarettes from the smokers.", "replies": [], "depth": 1}, {"id": "cpkpx8k", "text": "Classical music", "replies": [{"id": "cpktkrg", "text": "hah i'd never leave.", "replies": [], "depth": 2}], "depth": 1}, {"id": "cpksg3c", "text": "Motion-sensing buzzer? Can't use water in that drought of yours.", "replies": [], "depth": 1}, {"id": "cpktkll", "text": "Every time they're out there smoking, go bum a cigarette and sabotage their conversation. They'll stop coming back. ", "replies": [], "depth": 1}, {"id": "cpktl90", "text": "Did you ask them to stop?", "replies": [], "depth": 1}, {"id": "cpkwewb", "text": "Depending on ownership of the alleyway, a sign prohibiting smoking with a fine.  Perhaps look at loitering laws.  In Florida, there are statutes that prohibit this type of behavior, but again, depends on who owns the alley way.", "replies": [], "depth": 1}, {"id": "cpm6xl8", "text": "hang those anti smoking pictures all over with the graphic autopsy photos", "replies": [], "depth": 1}]