So the OP has a reserved parking spot in a parking garage, yet he can't substitute his car for a bike?!
The property manager must really hate cyclists.
I think zennmotion said it best about using a beater. The OP is going to have to change his way of thinking. All you need with that beater is the right saddle, pedals, bars, and the fit. The rest is negotiable. Or get a folding bike and bring it in your cubicle.
Personally, I'd build that beater and plaster messages all over it saying "Property Management "X" Sucks"!
Another thought would be to see if an adjacent building has a friendlier property manager. Even though you may not work in that building, the management might have more secure bike facilities. Also, sometimes the dumpsters are surrounded by fencing. Lock your bike to a non-visible side of the fencing.
I feel for ya'.