North » Waterloo » Iowa » Dunsmore House Dunsmore House Details c. 1866. 902 Logan Ave. This one-and-a-half-story stone house, somewhat Greek Revival in character, may have been built (and perhaps designed) by Thomas Chadwick, a stonemason who came to Iowa from England. The house was remodeled in 1913 and acquired a wing to the rear. Writing Credits Author: David Gebhard and Gerald Mansheim