The Billings Preservation Society is a non-profit, self-funded, tax-exempt organization which administers, operates, and maintains the Moss Mansion Historic House Museum. In 1986, the Billings Preservation Society obtained possession of the Moss home through a lease agreement with the family and separate option agreement. The Moss Mansion is self-funded with operational income from staff and volunteer organized fundraisers and cultural events, tours, private bookings for weddings and other occasions, and small short-term project grants and corporate event sponsorship each year.