Contact building management if it's taking up needed space, otherwise leave it be. There was an "abandoned bike" in our bike cage, there for over 2 years, dust coated. Recently they cleaned up the bike cage area and what do you know, that bike was removed before the cleaning date, must have been the owner (U-locked). Then, this week, that same bike showed up AGAIN, with a new seat and apparently tuned up. But it hasn't moved since Monday, so now we are timing the dust build up again.