Windows, Quoins, and Wall Bands
There couldn't be a better title for this. The homeowner was obviously a fan of windows, and lots of light. They made ample use of quoins on their multiple corners resulting from a unique floor plan.
In addition, the architect had the good sense to install a molding along the break between the first and second floor, which will go a long way in hiding any cracks which might occur at this weaker portion of the house.