That depends on the logic of you floor plan.
If my building grids were placed on a certain coordinate with a certain plan to it, it could be easy, even when it was rotated.
So what i mean to say is, do you have any sense of where your building is located relative to one of Revit’s built in coordinates systems? You would not need a new point in the model.
But if you don’t have that, you can always find the intersection of say grid a and grid 1 and go from there.
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