I don't know what the first building has to do with the original image. But the one in Dubai is much more conparable. But they are not the same. The Dubai building certainly needs strong framing to keep that overhand from falling. But it is also held at one end and the middle giving it strength and stability. And the forces at the attachment points are both vertical (upward or downward at the end depending on weight distribution on the lever and downward in the middle). That makes a huge difference as they don't have to work against lateral forces. The middle attachment holds all the weight and the end attachment counters all of the torque on the lever. The center of mass is also within the footprint of the building(s) bases

The actual length of the overhang for the real building, while impressive, does not compare to the length in the original image. It does not have anything holding the weight in the middle of the lever, meaning that the end attachment has to hold the weight up alone, AND counter the torque. Furthermore, the point at which the hang in the altered image is attached to the main trunk is also at wide angle meaning it will put a lot of lateral forces on the trunk that are not counter balances by the opposite branch which is shorter and less angled. The center of mass of the hanging branch would be well outside the base of the building and so it would want to rotate at the connection point and pull away from the joint. That's if the steel frame itself doesn't just bend under its own weight putting torque on the lever.

I really don't think that there are any materials under Earth gravity capable of creating a rigid structure with this design at this scale. The forces would be tremendous on a single junction point and along the length of the frame of the hanging arm. Something would give.