Good afternoon Margaret,
I'm Doug, and I'm very sorry to hear of your situation. My goal is to provide you with excellent service today.
The management company was grossly negligent in protecting the personal property that you have in your condo, and presuming that you can prove that the management company, through one of their employees, left the door unlocked which allowed the theft to occur, then you can sue the management company for the loss you sustained. In fact they almost certainly have liability insurance that will cover your loss.
If you have homeowner's coverage on the condo you should simply make a claim with your own insurance company and then allow your carrier to subrogate the claim against the management company. And under a theory of Agency Liability, you could also sue the mortgage company for liability based on the actions of their Agent, the management company.
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I wish you and yours the best in 2016,