Mourning Dove nest on structure

I've found a few Mourning Dove nests in natural situations, such as on horizontal branches of trees and one on top of a flat stump. But this one, on a beam under an overhanging roof at Elmer's House of Pancakes in Salem, Oregon, is the first I've found on a man-made structure. This adult was apparently quite accustomed to people passing just below the nest, and watching from the breakfast table just 10 feet away.