An easier method
The idea of using a steel slab is good but impractical because steel is expensive, it is heavy and it must be transported into your apartment, then drilled and tapped for substantial bolts. This requires equipment the average homeowner or apartment dweller doesn't have.
Being handy, I've done many installations and repairs for apartment dwellers. I'm amazed at the number of different construction techniques in use. Many larger buildings do not use wooden joists so anchoring to the floor is a hit or miss proposition.
Your new safe should have mounting holes in its bottom. Make a form of plywood and 1X6's. Then, go to Home depot or Lowes and buy a few bags of Sacrete, sand mix. You may buy these in 50 pound bags so there's no problem getting them into your apartment. Pick up a plastic mortar pan for about $10.00 or less. Mix the Sacrete and fill the form to the top. Use a piece of wood as a screed to get the top nice and flat. Next, insert the necessary threaded bolts in the wet cement, making sure they will correctly align with the holes in your safe. You may need to use cardboard as a temporary form to hold the bolts vertical while the cement sets. You may add a few pieces of rebar to the form.
After setting, bolt your safe onto the concrete platform. Apartment thieves will not get your safe unless they thought to bring along a sledge hammer and the people below you are deaf.
For added insurance and if you have room, add a few hundred pounds of lead ingots to the safe's interior.
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Last edited by federali; 10-24-2012 at 14:48..