Get a thick Python chain and lock, and fasten it to the cement with a ground anchor! You can also attach the ground anchors to the wall but if you are not planning on staying there for a while then that will be $140 of wasted money. It doesn't matter really if you are in a bad neighborhood or not--these bikes are quite sought after. I live in a safe neighborhood but not every thief received that memo. I do not have a garage or a carport either, but I don't want to drive all the way out to the nearest storage place everytime I want to take a ride so I got an extremely thick chain from Home Depot and I wield it through my bike tires. It isn't much but hey, like everyone says--make it as hard as possible.