Condemnation will terminate a lease when the entire estate (not just part of the estate) is condemned by eminent domain.
The destruction of the premises, through no fault of the tenant, will relieve the tenant of his duties under the lease.
Strict frustration of the very purpose for which the lease agreement was made allows the tenant to terminate the lease and vacate the premises.
If the purpose for which the property is leased becomes illegal after the lease is entered into, the lease is rescinded.