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GSA and FDA are building a new 80,000 square-foot research lab at the Denver Federal Center.
The historic Mike Mansfield Federal Building and U.S. Courthouse is undergoing a major modernization to improve safety, accessibility, operational efficiency, and long-term building performance while preserving its character.
Over time, age and weather-related impacts have contributed to deterioration of the building’s exterior and infrastructure. In addition, the building’s original design no longer meets current seismic or fire safety standards. The project will address critical building needs through targeted upgrades and preservation work. These improvements will help ensure the continued safe and efficient use of the building, while protecting its historic significance for future generations.
Address: 400 N Main St. Butte, MT 59701
Year built: 1903
Upcoming project improvement list:
GSA awarded the project’s design-build contract to Swank Enterprises of Montana in May 2025. A $2 million design-build contract for the construction management and commissioning services to Johnson, Mirmiran & Thompson, Inc. will support the building’s seismic retrofit and modernization needs.
In compliance with the National Environmental Policy Act, GSA is in the process of completing an Environmental Assessment. This was completed on 7/21/26 and SHPO concurrence was received on July 16, 2026.
The project is expected to reduce annual maintenance costs by at least 20% and extend the building’s operational life by approximately 50 years.
July 18, 2024
Mansfield Federal Building and U.S. Courthouse Public Input for Seismic Retrofit
April 17, 2024
GSA awards Construction Manager/Commissioning Agent contract for the Federal Courthouse in Butte, MT
| Planning | Design | Construction |
|---|---|---|
Design-build award Environmental assessment | Project design start Project design completion | Construction start Substantial completion |
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Rates for Alaska, Hawaii, and U.S. territories and possessions are set by the Department of Defense.
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U.S. General Services Administration