The bike (my wife's) was left unattended for no longer than a minute in our gated and fenced in backyard while we prepped for a ride to the Botanical Gardens. My wife went back outside and yelled that her bike had been stolen. We ran to the alley (fence gate was open), and saw a person in a bright blue shirt riding off westbound (alley immediately north of Wilson, West of Western) less than a block away. I gave chase on foot while screaming at the top of my lungs, but could not gain on him, and he turned right (North) on Rockwell. I circled the area in my car for an hour, and then on my bike for another hour, talking with people out and about, and distributing my contact info. My wife posted signs around the neighborhood informing of the theft, and called the police. They would not create a report as we did not have the S/N available. I've spoken with a couple of local bike shops in person to notify them of the theft. Attached photo is not of the actual bike, but nearly identical.