Terminal 5 is restricted to only those passengers holding a boarding pass for a flight departing from that terminal.
Try the end of Concourse L in the afternoon. Hopefully there will not be a lot of equipment parked close to the building, which can really clutter up a photo.
The food court in Concourse C is okay in the morning.
I've also been able to take photos in the past from Concourse E facing the United terminals.
When I was at ORD
3 weeks ago, the terminal windows (including T5
) were very, very dirty!
A noble spirit embiggens the smallest man...