Found a cat in Norwood Park

My girlfriend and I were walking around Norwood Park last night and found this little guy at around 7:30 PM walking alongside the train tracks (near Nagle and Avondale) He seemed mostly clean and was very friendly. Allowed us to pet him, hold him, etc. He didn't seem scared of people walking by or even dogs. Everything was closed, so we took him to MedVet, and they said they couldn't find a chip and cleared him of any life threatening issues (so they couldn't keep him). But they did say he has a cold/flu, and may have an infection around his eye. We couldn't keep him because we have two elderly cats who don't like other cats, and we don't have enough space to keep them separate. But we did find a really nice lady who has experience with Persian cats and agreed to take him in as we try to find the owner.