Questione giuridica chiave
Whether the cantonal appellate authority wrongly treated the deadline for paying the cost advance as non-extendable under federal law.
Decisione estratta
Yes. The question whether the deadline could be extended had to be decided under cantonal procedural law, not federal law.
Motivazione estratta
Federal law grants the right to a second appraisal and requires an advance payment, but it is silent on the details of the advance and the payment deadline. Therefore, the amount and deadline are set by the cantonal supervisory authority, and the extendability of that deadline is governed by the applicable cantonal procedural rules, subject only to federal rules on enforcement holidays and stay of proceedings.