The Mid-Continent Tower is a 36-story skyscraper located at 401 South Boston Avenue in downtown Tulsa, Oklahoma. At 156 meters (513 ft) in height, it is the fourth-tallest building in Tulsa and in Oklahoma. Faced with bright white terra cotta and crowned with a distinctive copper roof, it is one of the city's most recognizable buildings. The design is unique because the first 16 story structure was built in 1918. The top 20 stories comprise a separate structure, cantilevered over the first 66 years later. The architects of the addition matched the design of the original structure so carefully thaqt the result is considered a single structure.