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Unfortunately, under the law, the landlord is not liable for acts of third parties or for a neighborhood being bad. So legally you would still be in breach of the lease for moving out, even though you have done so because you fear for your safety. I am afraid that this is something you need to negotiate with the landlord to get him to agree to allow you out of the lease without penalty, but if he wants to be a jerk about it he could pursue you for breach of the lease I am afraid. If he agrees to let you out without penalty, get him to write that he is allowing you to terminate your lease without penalty.