Chicago multi unit - too good to be true?

[Wen Guo]

Hi everyone, I'm from California and fairly new to the Chicago market. But I saw some incredible deals there (comparing to the Bay Area), for example, a 4 plex getting $2400+/month would ask for only 55k. I do know it's 100yr+ building and is selling "as is". But you get your money back in a few years even if it's all cash.. is it too good to be true or is there something I should know about? The case link https://www.redfin.com/IL/Chicago/6732-S-Lowe-Ave-60621/home/13930684 there are tons of other deals like this too.