Difficult to win lack of security cases when a criminal steals your items. First check your renter's insurance policy if you have one. In a lawsuit you will need to show that the landlord's negligence was the cause of your robbery.
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First check your lease. It may require you to have renters insurance. If you do put in a claim, if you don't see what your lease says about it. The landlord probably has not liability. If you do sue based upon failure to provide adequate security that is a very difficult case to win.
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If the porch had been reconstructed timely, would the burglary have been impossible? If not, then your likelihood of success diminishes greatly before even getting into who other than the burglar is liable for the losses.
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