I rode my bike to work today and locked it in the same place I always do. There's a pedestrian passage way that goes from Dearborn to Clark to the south of the 55 W Wacker building. There's a wrought iron fence there with a small bike rack. My bike had its rear wheel resting in the rack and it's front wheel/handlebars resting on top of a thick wrought iron fence. There was an ABUS chain lock going through the frame, front wheel, and fence. I arrived around 8:30 AM and went to work. When I went to get lunch around noon I walked by and my bike was still locked to the fence, so the theft happened between 12 and 6 pm, when I left work. I would guess that happened before 5 since foot traffic increases quite a bit at 5 when people get out of work. When I discovered my bike was gone I went into the 55 W Wacker building and spoke to the security guard to see if maybe they'd have security footage but was told none of their cameras capture the sidewalks outside of the building.