The Petroleum Building is a 50 m (164 ft) 10-floor building at 420 South Boulder in Tulsa, Oklahoma. It was built in 1921, and is a steel and reinforced concrete structure faced with buff brick. The name was given because most of the early tenants were associated with the petroleum industry. Later, it housed the Mayo Brothers Furniture Company."Best of Tulsa - Petroleum Building" . Accessed March 10, 2011. It was identified as one of the supporting structures during the creation of the Oil Capital Historic District.National Register of Historic Places Registration Form for Oil Capital Historic District. Retrieved November 26, 2014.
The simple facade is said to be typical of the pre-Art Deco designs used in many downtown Tulsa buildings.NRHP Application: Petroleum Building. U.S. Department of the Interior. National Park Service. June 1978. Retrieved November 19, 2014.
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