There are three buildings on the site: the Ermatinger Old Stone House, the Clergue Blockhouse, and the Heritage Discovery Centre.

[5] It was built by Charles Oakes Ermatinger, a former North West Company fur trader who lived in the home with his wife and children.

[4] After the Ermatinger family left, the stone house was used by succeeding occupants as a mission, hotel, tavern, courthouse, post office, dance hall, tea room and apartment building.

Her work would ultimately result in the publication of a book titled, The Ermatinger Family of Sault Ste.

Clergue purchased the property and began the process of transforming it from powder magazine to living space.

In 1995 the St. Mary's Paper Mill was planning development that would jeopardize the location and structure of the blockhouse.