Park in the garage. Limited access and guards and out of the weather beats the nice rack outside. See if you can leave the heavy lock on the rack instead of carrying it back and forth. If building management and your office will allow (they probably will not), bring it up to your office area. See if you can make friends with the guards (especially if it is usually the same two people each day). At a minimum, wave, say hello, and don't blind them with a bike light.