The Olympic Cereal Mill, later called the B&O Warehouse and presently The Olympic Mills Commerce Center, was constructed in 1920 by the Hurley-Mason Company. It is an industrial landmark on Portland's east side, significant as a well preserved example of an early reinforced concrete industrial building. It is also significant for its association with the Portland Flouring Mills and General Mills, which played a pivotal role in establishing Portland as the principal west coast port for the shipment of flour products.

The Portland Flouring Mill was founded in 1883 by William Ladd. the company expanded to this site in 1914, taking over existing buildings. These buildings were demolished and replaced by the present mill. In 1923, the mill was purchased by Sperry Flour, a susidiary of General Mills. the well-known General Mills products, Bisquick and Wheaties, were produced here.