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I am sorry to hear about this situation. If someone in your situation stays, then one may be jointly liable for the building along with the landlord. What I mean by this is that while the landlord would ultimately be liable for the cost, the department can shut down the business meanwhile, affecting you.
However, someone in your situation can likely leave, because arguably, the non disclosure by the landlord constituted FRAUD, which can count as a material breach and allow the tenant to walk away. However if one does this, it is a good idea to then turn around and pursue the landlord for the fraud, and request the difference between the lease as one had with the landlord, and, a comparable lease in the area that one was forced to get otherwise.
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