The shooting started down there and moved to a location outside the Planned Parenthood building. Why didn't the shooter just go into the Planned Parenthood Clinic if that was his target? When the shooting started, the PP folks disappeared behind a locked door and bullet-proof glass. The shooter, meanwhile, found himself facing the CSPD, at a distance, initially. The shooter was really lousy at planning. If he were competent, he would not have done it.
PP had moved from a location in Old Colorado City, due to protests.
You didn't listen to the feed. Otherwise you would have caught the part about the shooter moving, barricading himself at the SW corner of the Planned Parenthood building (OUTSIDE!) and shooting at the approaching police units.
Really, take the time to listen to the police scanner feed.