Holman owned property in the Tualatin Mountains (West Hills) to the northwest of the city center. After the property was damaged by a flume operation in 1909, Holman offered it to the city for a park if it agreed to acquire the land necessary to connect his property to nearby Macleay Park. The transaction was not completed until 12 years after his death. In 1939 his siblings, George F. and Mary Holman, gave the land to the city, and in 1948, Holman Park and several other parks and parcels of land were combined to form Forest Park.