The Millbrook Building has housed the Facilities Planning and Management Department for a number of years. In the building the department has held classes for their employees so they can become more proficient on electrical maintenance, plumbing, carpentry, and many other skills they use at the university.
The name Millbrook comes from the combinations of the last names of David Millar and Robert Brookings. David Millar was a Washington University graduate and brother in the Gamma Omicron Chapter of the Sigma Nu Fraternity. He was the mayor of University City from 1933 to 1937, and a prominent Saint Louis Lawyer. Robert Brookings was a Saint Louis businessman and president of the Washington University Board of Directors from 1891 to 1928. Brookings Hall and Brookings Quadrangle both are named after Robert Brookings. Millbrook Square, Millbrook Square Apartments, and the Millbrook Pedestrian Overpass all also adorn the Millbrook name.