According to John White with the Denver Police Department, investigators recovered one round from inside the building.
The original call about the incident came in on Oct.12 at 3 p.m. The bullet shattered a window at the West 9th Avenue office.
People were inside at the time of the shooting, but no one was hit.
Investigators are still looking at surveillance video in the area, but do not have any footage to release yet.
(Copyright 2012 by The Associated Press. All Rights Reserved.)