Go to a neighborhood welding shop and ask him/her to fabricate a 2 inch steel Ring/plate in a piece of flat steel bar stock with two holes around 1/2 inch in diameter . Bolt this to the concrete and now you can run a cable or chain through your bike. This is done in your parking spot, I would check with the manager first to let him know no major damage will be done to the concrete. When you move, simply remove the block and patch the 2 holes with some sakrete. I did this at my Condo for securing a motorcycle I used to own. Now I use it for my bicycle on occassion. This is a cheap fix, shouldn't cost over $20 total. Check out the below links to get an idea of what you need to make. The piece that is to be welded at a right angle to the base plate should be centered between the two bolt holes used to anchor the baseplate.
http://www.pjbsecurity.co.uk/replace...defender-black
Here's another link; check out the last device at the bottom of this page with the ring. That device folds flat when not in use and any decent welder can fabricate one in less then 15 minutes. Personally I would mount this flush with the ground so a thief couldn't get a prybar under the plate to remove it. When I installed my plate, I chipped out the concrete 3/8" below the surface so the base plate was mounted slightly below the surface. It only took 10 minutes extra to add this step but is well worth it. A bike thief still could defeat this system but he'll work at doing it.
http://www.elitesecuritysupplies.com/