Obama wrote an article for the Columbia newspaper in 1983
https://www.scribd.com/document/10978031/1983-article-by-Barack-Obama-Breaking-the-War-Mentality-in-Columbia-University-s-Sundial-magazine
Columbia had him listed living at:
1. 3E at 142 West 109th Street Amsterdam and Columbus Avenues, NYC (Manhattan)
2. 339 East 94th st. #6a, NYC (Manhattan)
article below contains an interview with his roommate.
https://cityroom.blogs.nytimes.com/2009/01/20/recollections-of-obamas-ex-roommate/
Just a side note, based on what we researched back in the day, there’s absolutely no doubt in my mind that Obama met Bill Ayers during Obama’s time at Columbia.
Ayers went to school in NY from 83ish (Manhattan) to ‘87ish - Columbia.(Upper Manhattan)
I wonder if Brennan also met Ayers during this time ?
I think 109th at the time was pure Domnincan. Not 100% certain if it’s the same block, but it always had Dominican flags hung over they street and constant block parties with zillions of kids on the street.