Scaling model to fit geo location

I imported my geo location to my model. But the footprint of the existing house shown did not fit the model. SO I Scaled the model to fit the image of the house on the geo location map. Now my model is the wrong dimensions. Please help!

Wrap your model in a group, leave the geolacation image out of the selection when creating that group.
Enter the group and measure some distance that you know the exact length of, like a wall.
Immediately thereafter type the exact length and answer the question about resizing the group with yes and hit [Enter]