I believe there is some case authority which states that a landlord may be held liable, under a negligence theory, for the burglary of an apartment. Unfortunately, I cannot recall the exact circumstances that must be present before the landlord can be held liable. What is important for you to know is that there are situations where you might be held liable for the damage, and there are situations where your landlord might be held liable. The only way to find out for sure who is liable here is to consult an attorney. You can also try speaking with your landlord and see if you can come to an agreement on the repairs.