By Sarah Sax and Video by Lisa Nho November 25, 2024 9:18 AM EST T his year, the U.S. Department of the Interior’s Interior Business Center moved into a new office space in Denver. Building 48 is part of a sprawling complex of government service buildings, the largest concentration of federal agencies outside of Washington D.C. The building has been repurposed several times; it was previously a World War II munitions plant and most recently an aging National Archives and Records Administration