That sucks although i dont see the problem with using a bike rack. Of course you could work in an area with a high crime rate?

Buy a couple of U-locks and leave them on the rack. One for your rear triangle and rear wheel another around your front wheel\frame. Elements? Rain snow etc? Im in California and do not commute in the rain but I frequently lock up a carbon race bike with a power-meter (noon hammer ride) that you can guess was not cheap and only use one U-lock.

My work has never complained when I do take my bikes inside to my office but I am the one that feels improper for some reason...I can see the landlords point because I used to be able to leave an extra pair of shoes\gym bag at my Company's gym full time but I think I started a trend because after 6 months half the lockers had crap left overnight and they had to put a stop to that so now my shoes\crap stay in my office.