In the 1920s, Lt. Winslow's son, Francis Winslow (III), ended his career as a mining engineer and took over active management of the Brentwood Patterson/Winslow land. His most notable achievement was the development of the Union Market. For years called the Florida Avenue Market, it still operates after 80 years as the city's principal wholesale food and produce market. Photographs and a detailed history of this development may be found in an April 24, 2007, District of Columbia planning document, the Florida Avenue Market Study, at http://www.anc6a.org/FLaveMarketStudy.pdf .