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Richard O. Dulaney pursued both real estate and oil exploration with his Planet Oil Company, founded in 1917. Dulaney moved to Fort Worth in 1919, built a house (FW48), and, on purchasing this site in 1929, stated his intention to build “one of the finest office buildings in the state.” Dulaney, Fort Worth architect Wiley G. Clarkson, and contractor Harry B. Friedman studied modern structures in many cities in preparation for Clarkson’s design of this Art Deco building. Limestone panels with zigzags in relief form a frieze below second-floor window sills. This frieze frames sidewalk-level display windows in a step-corbeled pattern, infilled with flamboyant Minnesota red and black granite sheathing. Fluted spandrel panels of dark green cast stone recede between buff brick piers above second-story windows, giving the building a strong vertical emphasis furthered by setbacks at the fourteenth- and fifteenth-floor levels. Dulaney named the building for its primary tenant, the Sinclair Oil Company. Much of the original Mayan decoration and Monel (an alloy of nickel and copper) grille work at street level has been removed, but the Sinclair Building maintains its essential dignity and is a strong contributor to Main Street and Sundance Square.