Yes; I have searched the Web. I know it was a PS in NYC, around 119th St. I do not know which one it was; and the nyc.gov site doesn't provide information about him (they have never been great fans of Kohl since he criticised them horribly in those days).
I recall the book saying the school was within view, or within a very short walk, of the New York Central railway viaduct at 119th St. In that neighbourhood the viaduct is basically a wall, as though cutting the city in half.
Thanks for whatever authoritative answers you may provide!