Here's an idea that many people love, but to my knowledge has not been done. Buy a crappy van for as cheap as possible, and park it in the parking lot permanently. Whether it runs or not is immaterial so long as the locks work. Use the van as a mobile storage locker inside which you leave your bike during work. If they're happy to give you a 6'x15' space to park for free, use it!

Bonus points for removing the engine and replacing it with a flower planter.

So ridiculous, like the bike was harassing anyone. Good luck however you handle it. For a more conventional approach, do you have the sort of relationship with your management that you can enlist their help in dealing with the assh*le landlord?