The headquarters of the rancho served as the home of Robert P. Strathearn (and are thus known as the Strathearn House), built in 1892–93. The home remained in the Strathearn family until 1969, when the dwelling and 5.85 acres (2.37 ha) of surrounding land were donated to the Simi Valley Recreation and Park District. Two rooms of original adobe remain, now located in Robert P. Strathearn Historical Park in Simi Valley, California, which have been designated a California Historical Landmark (#979) and are listed on the National Register of Historic Places.