Commercial Lessees have only what rights are granted in the lease and unless you can show the landlord is in breach of the lease as written you may be liable for the rent and attorney’s fees until the space is re-rented or the lease is terminated. You should be honest with your landlord about the situation, and work towards a mutually agreeable solution.
I suggest you look into selling your business and assigning the lease to the buyer. The terms of your lease may specify whether that would require the landlord's consent and/or would still leave you responsible (along with the buyer) for the tenant's compliance. I have worked with others who have sold businesses for this purpose.