From the record
“Gardner Mansion, was built as a single-family home located at 509 South Superior Street in Albion, Michigan. It was listed on the National Register of Historic Places in 1971.”
Wikipedia article Gardner House (Albion, Michigan), CC BY-SA 4.0.
One of 50 National Register listings published here for Calhoun County · listed in 1971 · category: Building.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service · the Wikipedia article