Historical records indicate that the brothers Geoff, Petro, and Olaf divided up their large rectangular estate between themselves. Unfortunately, evenly dividing up favorable landmarks resulted in the complicated map below.
Each region here is owned by exactly one brother, the total area of each brother's regions are the same, and no brother owns two bordering regions.
Once the land was divided, one region remained which contained the main house. As all three brothers lived in that property, it has distinct borders with any other regions (So it can border any region, regardless of owner).
You have been tasked with finding the remains of that main house. You only have the unlabeled map provided.
To keep answers consistent, you can assume Geoff owned the land in the top right corner and Petro the region just to the left of that.