The 1924 Blue Dome gas station that gave the district its name
The original Blue Dome is a small filling station on the southeast corner of 2nd Street and Elgin Avenue, built in 1924 by Cities Service Oil Company (the predecessor of Citgo). It is a single-story stucco building with a low slung canopy and a striking dome of bright cobalt-blue glazed tiles — an unmistakable Mediterranean Revival flourish on what would otherwise have been a routine 1920s service station.
When it opened, it was the first 24-hour filling station in Tulsa and one of only a handful of round-the-clock stations in the central United States. Tulsa in 1924 was at the height of its oil boom, and a 24-hour station made sense in a city whose oilfield workers and traveling salesmen kept odd hours. The Blue Dome's bathrooms were also reportedly the first gas-station restrooms in Tulsa that were open to the general public, men and women alike — a small but genuinely progressive amenity for the time.
Cities Service operated the station for decades; after it closed as a filling station in the late 1960s, the building went through several uses before being restored in the 2000s as a working bar called the Dilly Diner (and later other concepts). The dome itself has been re-glazed and the exterior is now lit at night, making the original 1924 structure one of the most recognizable nighttime sights on Route 66.