Millen House has since served as a home for other prominent members of Bloomington society and campus administrators alike although the original 160 acre property has dwindled down and been subdivided so that only seven-tenths of an acre remain with the historic home. Over those years of occupation, the house has also been known by many names, such as “Wellswood House” and “Stallknecht House”, but it is the name given to it upon the 1969 purchase by the Indiana University Foundation that has stuck. Named for the two raintrees that once existed upon the property, “Raintree House” now serves as the executive headquarters of the Organization of American Historians who have fittingly occupied its historic walls since 1970.
In 2014, as part of their “Raintree County: A Celebration of the Life and Work of Ross Lockridge Jr.” exhibition, the Lilly Library partnered with the IU Office of Landscape Architecture to plant three golden raintrees at the house. Not only did this honor the centennial of local Bloomington author Ross Lockridge Jr., but the planting of these trees helped recognize the history and meaning of the Raintree house.