Found dark brown leather briefcase near City Hall

I found a dark brown leather briefcase this afternoon around 2:45 pm, sitting on the stone ledge outside City Hall on Market Street in Philadelphia. It’s about 15 inches wide and 11 inches tall, with a pebble-grain texture and a brass clasp; the interior is blue fabric, and there’s a small brass initials plate on the front that reads 'A. Rivera'. Inside the main pocket there’s a folded umbrella and a faded business card tucked in an inner slot. The bag has a few scuffs on the corners and a faint leather aroma, but the zipper still works and it looks like it held up well on rainy days. I’d really like to reunite it with its owner, especially since it likely contains important documents and perhaps a personal item tucked in the lining.