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In page George Henry Martin Johnson:

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In 1884 Johnson died at his estate Chiefswood on the Grand River near Brantford. It has been listed as a National Historic Site and is the only Native mansion surviving from the pre-Confederation years. The house and summer kitchen wing were restored in the early 21st century. In addition, much of the open grounds have been restored since the late 20th century to the Ontario Tall Grass Prairie Meadows that were characteristic at the time of the family's residence and had plants used by the Mohawk for medicinal purposes.[1] Today less than five acres remain associated with the mansion. Other parts of the more than 200-acre estate were sold by heirs over the years.