Ok, after more than a week of hauling the bikes up the stairs each day, I've opted to place them back on the bike rack provided by management where I live.
But I'm not counting on the thieves deciding to change their behavior. Instead I've invested in hardware. Lots of it.
I've always had good, heavy duty locks, but now I use multiple locks on each bike so the thieves don't steal the wheels off of them, like they did last time.
It's just that now--between the chains and the U-locks-- it looks like my bikes have gotten a thing for bondage.