About the Collection Specializing in single-family residences, the Leenhouts firm was locally well known for its regional modernist style and utilization of passive solar technologies. It was in existence from 1945 to 1990. The digital collection includes over 80 drawings of 11 projects - a very small sample of the more than 6,000 drawings in the archival collection. Selected drawings demonstrate the range of projects undertaken by the firm - primarily residential, but also public buildings and urban development projects - rom the mid-1940s through the 1980s. Robin Leenhouts, daughter of Willis and Lillian, donated the bulk of the firm's archives to the UWM Libraries in December 2002 and September 2005.