KBZK.com: If you’re interested in stepping back in time tomorrow’s your chance. Bozeman’s First Federal Building and Post Office located at 32 South Tracy first opened its doors nearly 100 years ago. The building became the property of HRDC in the mid nineties. They spent $2 million to renovate the building.Old pictures line the hallways and show the different stages of construction. It cost $60,000 to construct the building and it served as the post office and federal building for about 60 years and then housed the Army Reserve. Read more.