This question require more knowledge about the situation and the specific lease document. The short answer based on your above statements is probably not.
Even if the lease has a clause where the landlord is responsible for maintaining the property and the landlord is in "default" for not doing so, most leases have a cure period for such defaults. If the default is cured, the Landlord would not be in Breach of the lease for that specific default.
Has the tenant notified the landlord of such a default? If not, no cure period has begun, therefore the landlord wouldn't be in Breach and the tenant has no grounds for terminating the lease based on your above statements.
Jul 21, 2010