From the record
“The Jefferson Mosier House is a historic house in Mosier, Oregon, United States. Mosier (1860-1928) first platted the town in 1902 on what had been his father's donation land claim, and tirelessly promoted it for decades after.”
Wikipedia article Jefferson Mosier House, CC BY-SA 4.0.
One of 31 National Register listings published here for Wasco County · listed in 1990 · category: Building.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service