 Rooke advanced the design of large-scale milk plants, for the Sheffield Farms–Slawson–Decker Company (aka Sheffield Farms).The company had been established in 1902 with Horton as its president and was at the forefront of the dairy business in the early 20th century.In 1903, Rooke designed a stable and milk depot for the company, at the southwest corner of Broadway and 130th Street in Manhattan.