Guelph's downtown is quite large in area, but perhaps lacking in highrises.
Stone predominates in the downtown buildings of Fergus and Elora as well as Guelph, Galt, and St. Mary's. Ancaster is predominantly stone too, but it's a village, and like some of the other places I listed earlier, stone can be found mainly on residential buildings. There are a number of stone buildings in Dundas, but brick predominates (I included a few stone buildings in my
Dundas phototour)