The Olson Farm is a unique 60-acre farmstead dating from 1897, located on a sloped, wooded site along the Green River. It presents an intact assembly of rural buildings, a site shaped by agriculture and a rich stream ecology with an indigenous salmon run and wildlife.

BOLA and its landscape architect, The Berger Partnership, provided research, building condition assessments, and a master plan for the preservation of the historic buildings and site, and natural environment, and interpretive goals for educational and recreational use of the property. The masterplan included an inventory of historic and existing buildings and site features; analysis of historic land use patterns, wagon roads, and stream path; wetlands designation; designs and specific guidelines for building rehabilitation and restoration, site improvements, and interpretive signage; plans for a new office, restrooms and education spaces; preliminary construction estimates, and a phased implementation strategy.

The Olson Farm Master Plan received a preservation planning award from the State Office of Archaeology and Historic Preservation in May 2002, and in 2012 received the Best Restoration Project award from Historic Seattle.

BOLA is currently providing design of the fifth phase of rehabilitation for site improvements, drainage, and stabilization of the property, the stream and buildings. Work has included reroofing, site fencing, barn flooring and siding, foundation improvements, facade restoration design, and orchard restoration.