Thanks, mate! Planar reflections did the trick! (If you want, you can submit “hello” or whatever as an answer, so I can accept it as correct, for you. ^^)
Here’s what I did: (For those interested,) After enabling “Support global clip plane for Planar Reflections” under “Project Settings”, I added a planar reflection to my scene, and positioned it’s wire box correctly around the wall I wanted to reflect. The planar reflection didn’t look good at first, (there was a white line at the bottom,) so I played around with it’s settings in it’s details panel until it looked good.