Bike Rack from Apartment's Underground Carpark Removed - Is building management liable?
If you are insured make an insurance claim and they will follow up on any legal liability someone else might have, but you get a replacement bike quickly.

If you are not insured, you are in a lose/lose and maybe lose some more situation. You can accept that your bike got stolen and get on with life. Or you could sue a large property investment company and spend the next few years in a legal battle you cannot afford to lose digging a deep hole that is only getting deeper. Regardless of legal liability, the cost means they will laugh at you with the response "My pockets for legal fees are deeper than yours, see you in court and raise you costs". Given the risk they will win, and seek costs against you, they don't really care about how much they spend winning because you pull out - and when you do, they will seek costs anyway.  

The only realistic option is ask nicely, or if your country has the concept of a small claims tribunal where you can bring a claim without paying lawyers.

As far as answering your question - apart from the fact that would be providing legal advise, its not answerable without seeing your contract and knowing what part of the world you live in.