The ugliest McMansion I've ever seen in St. John's is at the edge of the 1940s core. This is the point at which large masion estates gave way to farmland. One of the nicer examples (since turned into an inn) is directly across the street:
But the McMansion, modern infill, is just... hideous and incorporates no traditional Newfoundland influences. It could easily be anywhere in architecture, colour, finishings... brutal.
It reminds me of the new "upper middle class" areas in the East End, generally for people who get moderately rich running fast food restaurant chains or newly-minted provincial politicians.