110 West 7th Building, Commercial skyscraper in downtown Tulsa, United States.

The 110 West 7th Building is a 28-story, 388-foot (118 m) commercial skyscraper in downtown Tulsa, Oklahoma. Its International Style form is a rectangular extruded block with windows set in broken horizontal rows that form a black and white grid across the facade, floodlighted at night. The building is served by 10 passenger elevators and 1 freight elevator.

Completed in 1971 as the world headquarters of Cities Service Oil and Gas Corp., which moved from the Cities Service Building in New York City. At its peak the building held 2,300 employees, many transferred from New York, Bartlesville and Philadelphia, making the company Tulsa's largest private employer. In 1980 Cities Service began a 52-story replacement tower, but after sales to Occidental Petroleum, Southland and Petróleos de Venezuela the company left Tulsa for Houston in 2004; the replacement was topped off at 17 stories for ONEOK.

The black-and-white grid facade is floodlit at night, a detail that has made the tower a Tulsa landmark. The building was finished in 1971 in the International Style that matured after World War II, with a rectangular footprint, a cubic extruded-rectangle form and windows in broken horizontal rows. Its facade angles are set at 90 degrees.

The building has ten passenger elevators and one freight elevator serving the entire 28-story structure. These systems allow efficient movement of people and goods throughout the building.

The building's black-and-white grid facade is floodlit at night, a detail that makes it a recognizable Tulsa landmark. It is the third-tallest International Style skyscraper in the city, after the BOK Tower and the Bank of America Center.