The Frank E. Moss US Courthouse (Moss) is a contributing structure in the Exchange Place Historic District of downtown Salt Lake City, designed in the Neoclassical Revival style. It was originally constructed in 1905 and added to the National Register of Historic Places in 1978.

The building has been expanded and renovated throughout the years; NWL’s work involved the most recent renovation, which included renovating a historic courtroom and incorporating a new courtroom and judges' chambers on the fourth floor.

For the historic courtroom, the design priority was to preserve its original character. This included restoring the historic walnut-paneled walls and original ornamental ceilings, as well as upgrading the lighting and mechanical systems and improving the room's acoustics.

For the new courtroom and judges’ chambers, the design incorporated a covered ceiling between the existing courthouse roof trusses to achieve the required lighting criteria and ceiling heights. This new space was finished with high-quality, intricately detailed custom millwork for the judge, deputy clerk, witness, and jury benches, as well as decorative guardrails and seating.