Hello! Thank you for your question today. My goal is to provide you with honest information you seek and and not necessarily to tell you might be hoping to hear.
I am sorry you find yourself in the predicament. In general, a person is not liable for a lease agreement which is executed on behalf of an LLC and no personal guarantee is agreed to. Typically, commercial landlord's will require a personal guarantee but if they do not and one is not signed a member of an LLC is not liable for the lease.
However, the set of facts you present does contain some risk of personal liability because you used a personal check and you were not a member of the LLC at the time lease was signed. In this situation, a landlord could assert that you personally signed for the lease.
There is potential liability on your behalf given the nature of the transaction and it is not helped by the fact that the LLC is not compliant with the Secretary of State. You increase that risk by using the premises for your own individual purposes. In addition, the lease would be for an undivided 1/2 interest meaning the other tenant and you would need to agree as to what space will be used. Not to mention that potential for conflict.
The other potential issue that is created by this situation is that if you are involved in the daily business but not a member of the LLC, then you could be deemed a general partner which exposes you to more personal liability by the actions of the husband and wife.
The worst case scenario is that the landlord attempts to come after you for rent if the business does not pay. There are mitigating circumstances that lean in your favor (intent to sign on behalf of the LLC, no personal guarantee signed) if that does come to fruition.
I apologize that this was probably not the answer you were hoping to receive. However, it would be unfair to you and unprofessional of me were I to provide you with anything less than truthful and honest information.
All my best & encouragement.
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All states have intricacies in their laws and any information given is simply information only and specifically is not intended to be, nor does it constitute, legal advice. This communication does not establish an attorney-client relationship with you.