I would highly recommend that you have a local real estate attorney review you lease. Many will offer a free initial consultation.
It may be difficult to walk away from your commercial lease without some compromise in payment. You may have to break your lease, and your lease may have a fee for doing that. You should find a local attorney to review the lease and other documents and correspondence in order to give you proper legal advice.
As usual, this answer does not constitute official legal advice and does not create an attorney-client relationship between the poster and me.