As a franchise and commercial lease attorney, I can tell you that what you have described certainly seems to give rise to a great claim against the franchisor. If the franchisor is located in a state like NY or CA that requires that the FDD be registered with the state or one which has a state franchise law (unlike PA, which does not), you might want to notify the state's Attorney General's office.
Unfortunately, the lease is an entirely separate legal document and independent of the fraud or misrepresentations of the franchisor UNLESS the landlord is also the franchisor. If the landlord is an independent 3rd party, the franchisor's wrongful deeds will not provide an opportunity to terminate the lease.
With that said, my firm has a great deal of experience in terminating commercial leases. I would be happy to discuss your situation with you if you want to call me (215-525-1165 x101).
Please understand that this reply is merely generic and that you have not provided sufficient facts for me to render a specific opinion about your exact situation. This reply does not create an attorney-client relationship.
This response does not create an attorney-client relationship and is not intended to provide legal advice for your specific situation.
I'd have to see the lease to be sure, however, but it would be very unusual for a commercial tenant to be able to void a lease. A more likely outcome would be that you vacate the premises, and they sue for back rent, and you defend and make counter claims for misrepresentation, fraud and other claims that reduce or eliminate you obligation to pay.
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This communication is intended as general information and not specific legal advice, and this communication does not create an attorney-client relationship. To get legal advice, consult an attorney in your local area or the area where the issue is located. It should not be relied upon as legal advice. The response is based on the limited facts provided, and without any independent investigation of the author. Given additional or different facts, the response would likely change. The attorney providing this response is only licensed in Pennsylvania, and you should contact an attorney in your jurisdiction if it is outside Pennsylvania.