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The brick warehouse that currently houses the State of Wyoming Department of Environmental Quality, Air Quality Maintenance, is located at 720 West 18th Street and is bordered on the west by a railroad line and spur. The property is on the west side of the original commercial district of the City of Cheyenne, Wyoming. It is significant because it represent the early twentieth century commercial activity in Cheyenne. It is also significant because it was designed by prominent Wyoming architect William Dubois and is the only known example of a Dubois-designed warehouse remaining in Cheyenne. Cheyenne had its origins as a railroad town created in 1867 by the construction of the first transcontinental railroad, making it an important transportation center from its inception. Therefore, its commercial history was inextricably tied to the railroad. The warehouse building was constructed in 1929. In 1937, the warehouse was extended on the north to its current dimensions, and William Dubois also designed the addition. It housed a variety of businesses, including the Wyoming Fuel and Feed Company, the Cheyenne Transfer and Storage Company, the Wyoming State Liquor Commission, and the Wyott Manufacturing Company, a wholesale restaurant supply firm.