Bicycle detail

had my bike locked to a bike rack behind the CU Building on 14th and Larimer, in the outdoor corridor between 14th Street and the Cherry Creek River Trail. I last noticed the bike through the windows of my workplace around 7:30PM, still locked to the rack. When I left work at about 9:30pm, the bike and the lock were entirely gone. I alerted the building security guard. He and I each did a perimeter of the area but did not find evidence of the bike.