The ranch became a major producer of oranges, and was the world's leading producer of lima beans. When he died in 1947, the company was controlled by the James Irvine Foundation and family stockholders, until investors bought the company in 1976. The building housing the museum was built in 1868 as a two-story ranch manager's home. It also served as the headquarters for the nearby cattle and sheep camps. The museum is open every Sunday and Tuesday between 1 and 5 p.m., or by appointment.
Admission is free to society members.
The museum also takes donations.