However, from a logical standpoint, it sounds like this landlord is going to be uncooperative all the way through. You might want to cut your losses and not have to deal with him for a whole year....something to think about what you want at the conclusion of investigating your rights here.
You can most likely get this answered very quickly by an attorney, or go down to the county courthouse. They have free legal services for tenants there. I'm not sure of the hours that someone is there, but you might be able to get it answered there.
Personally, I think that you may be liable for the deposit but since I'm not reading the contract, I'm not a reliable source for an answer. I'm also not answering as a realtor as we do not have the legal background to give you that kind of advice. Only attorneys can interpret the legal contract on your behalf, and the final decision may be that of a small claims court judge.
One way or the other, I would contact the landlord as quickly as possible to minimize the damages. Let him find another tenant as soon as possible, if you don't plan on moving in.
Confer with listing agent or attorney.
Depends on how the contract was authored you might be able sue DISCLAIMER: without review of paperwork difficult to make any full statements.
Read your contract. If you can sue forward a demand letter for payment per lease agreement you might be able to retain the deposit and 1st months rent or even more !
An amendment would need be signed by both parties attach to executed agreement
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