Hi Nick,
Note that you can exploit the inference engine to do the job for you. After grabbing the right grip of the scale tool, you can snap to any corner of your ground floor group. See attached images.
[image: 7XXl_step1.jpg]
[image: ly3l_step2.jpg]
Note however that unless your second floor is not just a hollow box (i.e. no wall thickness, no windows, furniture etc) it will scale everything proportionally and everything will be "distorted" in this way of scaling.