Is your job going to pay the broker fee? Bankers Trust (before they became Deutsche Bank) did that in the 1990's. Anyway, my suggestion is Craigslist and/or try to befriend city-data.com members in the finance forum and put the word out.
https://www.city-data.com/forum/busin...nce-investing/ Finance should stick with finance because you can chat about the markets and you can network mutually. When questioning potential roommates, the key probing questions in my opinion will reveal who's a heavy partier/drinker and who's not. You can ask "What's your favorite beer?" etc