Kernrechtsfrage
Whether the tenant validly invoked set-off within the grace period under Art. 257d CO and Art. 124 CO.
Extrahierter Entscheid
The tenant's letters clearly expressed an intention to set off the rent arrears; the declaration was timely, but no set-off was possible because the counterclaim was not yet due.
Extrahierte Begründung
A compensation declaration need not use the word 'set-off' if the creditor can understand which claims are involved. However, the alleged dividend claim was not established as due in 2004, since no dividend had been fixed by the general meeting.