text: Although both Cook County parcel data and CookViewer say the address is 1517, both display 1519 on the maps. Furthermore, photos of the building display the number 1517 above the front door. 1517 is also used on many realtor websites. As the number above the door displays 1517, and the Cook websites say it is 1517, I think its safe to settle on this.
  
  https://www.zillow.com/b/1517-n-bell-ave-chicago-il-9S229h/#mmlb-0
  
  https://maps.cookcountyil.gov/cookviewer/?pin14=17061030180000