There’s the PIT, the Magnet and UCB as other places that have improv classes, but I don’t know if they have stand-up classes. They have late night open mic shows where your friend could get stage experience. There’s a huge improv scene associated with those theaters that envelops stand-up, so your friend might want to start hanging out down Chelsea way.
Flutheroos!, we appreciate the links, etc. What we are looking for is input from people who have taken classes at one or more of these schools so as to better determine which one would be a best fit. Thanks!