Normally, a person is charged with knowledge of the contract that they sign. However, your father may be able to get out of the contract, because it was not presented to him in the language that it was negotiated.
It is probably valid, but would have to be fully reviewed to see if there is a way to get out of it. He cannot just give notice and leave the building, unless the lease allows it.
Your father should consult a lawyer familiar with the in and outs of commercial leases to negotiate and end to his tenancy. Good luck.
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