Legal Question in Landlord & Tenant Law in Washington

Re: assignment and assumption agreement

If the original obligee (the person who originally signed the original contract with the assignor) signed the assumption agreement and the assumption agreement does not have any specific terms to the contrary, the assignor should be relieved of all obligations under the original deal, which has been supplanted with the new contract. If the original obligee was not part of that assumption deal, the assignor is likely still on the hook.

I would suggest bringing the contracts to an attorney for review. You are asking a very specific question that can only really be answered after reviewing the contracts.