i live in an apartment building, up high. like a year and a half ago i heard some crazy powertool sounds on the street down below, and it was two guys stealing the bike that was heavily locked/chained to a very sturdy guardrail. i yelled out of my window and called the police but obviously they didnt come until it was too late. the bike was found a few blocks away, totally stripped. the owner got a new bike but keeps it locked up in a garage. definitely don't leave it on the street.