Key legal question
Whether the cantonal court acted arbitrarily in treating the 30 December 1999 lease document as a new contract rather than a mere modification of the 1993 lease.
Extracted holding
The cantonal court's result was not arbitrary: the 1999 document contained essential new terms, did not refer to the 1993 lease, and could reasonably be seen as a new lease.
Extracted reasoning
A contract lacking the official rent form is only partially void as to rent. But the 1999 document changed essential elements, was separately drafted as a lease, and took effect mid-term, so the inference of a new contract was sustainable.