Jeroen

I have modelled multiple buildings in one file with roof mounted PV systems. Is there a way to change the orientation (north arrow) without deleting the systems and changing the orientation of the buildings one by one? seems simple but I cant find the option. I really hope there is one because otherwise I have to redo a great deal of work. Another question, When I have rotated buildings, is there a way to enter distances between objects perpendicular to the objects? It seems as if i can only enter the x-y direction which is North-south and east-west.