I lock most of my bikes together when they are stored. I have had several bikes stolen from a locked storage building, and FWIW this building was built like a regular house not one of those little hut things. They actually took the bikes out the top section of a double hung window because there was plywood nailed over the bottom half of the window, and they didn't take just one bike they took 5 as well as a bunch of tools and camping equipment. They were determined that is for sure. I only managed to recover one of those bikes and none of the other stuff. Insurance paid very little.

Aaron