I am working on a model that was created from a satellite image for my background. I created my outside walls based on the images of the barns in the JPG. In the top view, the building I am trying to model is at about 45 degrees from horizontal.

I have tried using the Rotate Plugin and the Advanced Edit Plugin, but neither allow me to rotate the entire model by a specific number of degrees.

Is there any way to rotate the model so that my horizontal and vertical lines match up with the X-Y grid?
[:-/]