Originally Posted by
simsles
A bit late now I admit, but one of the many advantages of a folding bike is that you can generally fold it up and take it with you into a building. Taking off any easily removed parts such as seatpost, lights, computer and pedals (if MKS Q/D pedals) is the next best option.
Otherwise perhaps, fold it up before locking it to something solid with the best lock you can afford.
+1. Why else have a folding bike? You are lucky you didn't lose the whole bike. The only 95% safe lock is the NY Kryptonite, and only then because you are 95% likely to get the money back from their insurance policy once the bike is stolen.
I was denied entry into a building recently (they had a metal detector and wouldn't let me place the bike on the luggage scanner). I was supposed to give a presentation that was important for my work. When they wouldn't let me in, I just called them and apologized that I wouldn't be showing up for the presentation.