Not real. Several problems here.
1. Big shadow on his right leg. Possibly from aircraft taking photo, but then the shadow wouldn't be limited to only his leg.
2. Right foot/Right foot shadow. Assuming that looking straight into the photo is "north", the foot/foot shadow would indicate a light source to the north east, creating the south-westerly shadow. Then, looking at the buildings below, we see shadows on thr north-western side of their casters, indicating a south-easterly light source. They
3. Even if somehow the photo itself is real, the illusion that he is thousands of feet above the ground is simply not true. There is almost certainly a landing or platform below him, for several reasons. One, he's Tom Cruise. No agent in their right mind would let their paycheck die for a publicity stunt, and Two, there is graffiti on the tower below what would be easily reachable from the top, indicating that it had to have been applied from below. Also, the fact that Tom is even up there suggests there is a landing below, as the only other realistic way for him to have gotten there would have been to be dropped off by helicopter. Very unlikely in comparison.