Even beefing up the door might not help. In some buildings, there is nothing between the living space and the hallway but studs and two sheets of dry wall that can easily be kicked in.
Still the door is the most obvious point of entry and reinforcing it can't hurt, but if the building management wants to be bad about it, they may prohibit any changes and order any changes already made to be undone. They can charge for "restoration" to the original condition even though that condition is unsafe. There is very little on wall construction in city codes, which seem more oriented toward fireproofing than toward protection against intrusion.
Jim
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