The rotunda served as a two-floored main banking lobby with a domed ceiling, which held 20 teller booths in a circular pattern.

[2] The lighting in the dome was diffused with a plastic louver called a "squiggle" pattern which is made up of several thousand pieces but gives the appearance to be a smooth flow of curved lines, which was the first of its kind in the United States.

[1] The surrounding square box-like structure has a floating appearance, held off the ground by projecting beams on the north end, which served as the office space for the bank.

Due to push back from the Casper community, demolition plans were halted, and the tower remains standing.

The multi-million project involved asbestos removal, system upgrades, electrical and plumbing maintenance, the office areas have changed into clinic rooms and diagnostic centers, and the rotunda now doubles as a lobby and event venue space.