Probably Willows Mobile Home Court located at 1st Avenue East in Grinnell, Iowa. Drake Community Library (Grinnell, Iowa) Archives. Martzahn City Planning Slides, p.20, slide 11.
The Wiltfang apartment buildings at 1120 Reed Street in Grinnell, Iowa. Drake Community Library (Grinnell, Iowa) Archives. Martzahn City Planning Slides, p.1, slide 9.