Built 2 chunks in the wrong direction/Rotate Chunks with Buildings, Zones and Terrain

[yecnuahci]

I have been rebuilding a section of a town that I like in real life but I managed to screw things up and build the map with the upper left border being north instead of the upper right being north. I would like to rotate this as I want to continue building the towns in my area but having this 90 degrees off will really mess that up. I have contemplated just building around it but I really want to find a way to rotate the map without replacing every building, zone, etc...

 

I understand I will lose some stamped items that do not have existing directions but I would really like to turn the rest of the map even if I have to restamp road and parking spot guides and lines.

 

If there is any other information I can provide that will help I would greatly appreciate it. I am not aware of any way to rotate the map without rebuilding everything and if I can avoid that I would really appreciate it.