I visited the location of the 'Cops' stunt when I was in Hollywood last year, and it's an absolute must-see for the Keaton completist! They were demolishing a building at the rear right of the alleyway when I was there (not sure if it was the one that can be seen in 'Cops'), but even so, it's still instantly recognisable. It was a real thrill to see it.
That COPS stunt is one of my all time favorites. Without knowing the history, I spent many hours at that newssatnd. When I found out that it's "sacred ground" I almost fainted. "If I had a nickel..."