If you're where I think you're at....I believe that area is reached through the matador's apartment. You have to get further down the street and reach his apartment. There's a secret room/hallway in his fireplace. Follow it and exit out the window onto a wooden "tightrope". This tightrope will lead you to to a rooftop where you'll find the baggage I believe you're talking about. Also note that sometimes a rank up (the glowing Exclamation Point) will appear in a balcony to one side of the wooden tightrope. If so, get it after you've gotten the baggage and are returning to the hidden hallway in the matador's apartment. You may not be able to get back to the tightrope once you get the rank up, but you can always re-enter the apartment from the street below.