Safest way to store bike outside (city) I bike commute and just moved to a tiny third floor walk up. I was willing to give up some of my precious space to store the bike, but it turns out that the narrowness and curvature of the stairs makes it extremely difficult to get the bike up and down. If I was going to store the bike outside, what is the safest way to do so in terms of lock configurations? There's a thick lamp post that I can see from my apartment that I'm considering locking it to. Thanks!

EDIT: The bike is fairly expensive (~$1000) and I use it for both commuting and amateur triathlon racing, so I don't think a folding bike is an option. The cellar of my building is even less accessible than my apartment. Based on everyone's advice, sounds like making some small modifications to get it up the stairs and stored safely is the way to go.
Not answering your actual question, but this might be useful to you.

To get a bike through narrow or awkward spaces, hold the handlebars and pull it up onto its rear wheel so it is pointing straight up. It relatively easy to balance a bike like this and push it around on its rear wheel while holding the handlebars. In this orientation it's about as wide as a person and can be turned in place. It's easy to go down stairs and it's even possible to go up stairs by walking backwards with it. The rear brake can be used to stop it slipping backwards.

If you use this technique you may find you are able to more easily get the bike into your apartment, which will be much preferable to locking it up on the street, with respect to both theft or vandalism and the effects of weather.