In 1930, the company added four floors to the top of the 1924 structure to house its divisional offices and toll terminal equipment needed for the underground cable that connected Tulsa with Oklahoma City.

However, company engineers expected to add more stories in the future as the Tulsa telephone system expanded.

[2] The original two-story building was designed using Gothic Style architecture, which was then in vogue in the United States.

[2] Southwestern Bell Dial Telephone building was added to the National Register of Historic Places under criteria A and C on June 22, 1984.

[3] [a] Hall's business was a manually operated switchboard in an office on the second floor of a building at the northwest corner of First Street and Main.