The Society purchased the home in 1964.

In 1930 the Society purchased its own premises for the first time.

The Society at first leased the courthouse from the county but purchased the building in 1993.

In 1940 the Society of Jesus purchased the property where Sainte-Marie stood.

In 2011, the Society purchased a neighboring historic property to house its expanding staff.

In September 2000, the Historical Society purchased the old Spaulding building from the city for $1.00.

The Historical Society of Watertown purchased the house in 1922.

After Patterson's death in 1881, the Historical Society of Pennsylvania purchased the mansion as its permanent home.

At the request of local citizens, the Society purchased the building and began extensive restoration work.

The Society formally purchased the land in 1875.