This lovely description of Dubrow's comes from Lisa Kennedy's article in the Village Voice, which you can read here. She is quoting Brooklyn native Bernard Glassman's experience of Dubrow's:
"Truth be told, that first day's search for boxes for shelter and cans for income had the playful exuberance of Carole Lombard tracking down "a forgotten man" for her upper-class scavenger hunt in My Man Godfrey. But Glassman is candid about the romantic origins of the Street Retreat. "I remember explicitly sitting in Dubrow's, a cafeteria in Brooklyn, eating," he says one afternoon. "And at the next table was a bunch of bums - Bowery-type bums - and they were discussing philosophy, and I was amazed. Their discussion made me feel that there was some kind of knowledge on the streets that was more profound than the kind of knowledge I was getting. I can still picture them - it was a long time ago."