110 West 7th Building

The 110 West 7th Building is a commercial high-rise complex in Tulsa, Oklahoma, built in 1971 as the worldwide headquarters of Cities Service Oil and Gas Corp. At 118 meters (387 feet) tall with 28 floors, it is one of the most distinctive buildings in the city. Its architecture follows the International Style that took hold after World War II, evident in its cubic form and the characteristic black-and-white grid facade, which is lit up by floodlights at night. The building originally housed thousands of employees and was at times the largest private employer in Tulsa. After several changes of ownership and the relocation of the company headquarters, it now serves as a general office building, where the oil company Occidental Petroleum, among others, maintains its Oklahoma offices.