Kernrechtsfrage
Whether the tenant could challenge the second termination by relying on rent reduction due to denied access and alleged interference after access was restored.
Extrahierter Entscheid
Only the short period of denied access justified rent reduction; after the keys were returned, continued operation remained feasible and no further reduction to zero was warranted.
Extrahierte Begründung
The first termination and the landlord's conduct did not make continued use of the premises impossible or unreasonable after 6 May 2009; the tenant failed to show a legally relevant continuing disturbance.